Sinking columns are one of the most hazardous geological structures in north Chine typed coal fields. To understand the sinking column formation, to judge if the columns are hazardous or not, the inner circle mechanis...Sinking columns are one of the most hazardous geological structures in north Chine typed coal fields. To understand the sinking column formation, to judge if the columns are hazardous or not, the inner circle mechanism of groundwater in forming sinking columns in the relatively isolated areas was proposed according to the investigation on formation or distribution of sinking columns in some north China typed coal fields, such as Fengfeng, Xiangtai, Huaibei, Yangquan and so on. The heat generated by magma energized groundwater circulation and developed limestone karst in the relatively isolated areas. The CaCO3 solution accelerated by geothermal abnormality, the effect of high content of CO2 on dissolution and saturation of CaCO3 were discussed. Compared the forming conditions of the sinking columns developed in other coal mining areas in north China coal field, the paper deduced that the above factors collude karst development and sinking column formation, the columns in current geothermal areas are permeable and those in high coal rank areas or in paleo abnormally geothermal areas. The paper suggested that the sinking columns in the current abnormally geothermal areas were permeable, but those in the areas with high coal rank were not on contract.展开更多
This paper takes No.52 return uphill roadway of Yangquhe coal mine as a research project. Based on the research, especially its geological condition, indoor experiments, numerical simulation and theoretical analysis w...This paper takes No.52 return uphill roadway of Yangquhe coal mine as a research project. Based on the research, especially its geological condition, indoor experiments, numerical simulation and theoretical analysis were employed to determine the difficult coefficients of Yangquhe project. By using these means,the difficult coefficients of the deep rock engineering were determined. From a study of the effects of crustal stress and the roof mechanism on roadway stability, the transformation mechanism in Yangquhe coal mine has been determined. As a result of this research, the interactive support technology of prestressed cable mesh was developed and the technology tested in mining engineering, which proved to be feasible.展开更多
Objective This study aimed to investigate the occurrence of No.12 lymph node micrometastasis in patients with gastric cancer and its relationship with clinicopathological parameters and prognosis.Methods A cohort of 1...Objective This study aimed to investigate the occurrence of No.12 lymph node micrometastasis in patients with gastric cancer and its relationship with clinicopathological parameters and prognosis.Methods A cohort of 160 gastric cancer patients who underwent gastrectomy and lymph node dissection were selected as the research subjects.The immunohistochemical method was used to detect the micrometastasis of No.12 lymph node sections with negative routine pathological detection.At the same time,the clinical data of patients were collected and followed up to analyze the clinical significance of No.12 lymph node micrometastasis.Results A total of 370 No.12 lymph nodes were detected in 160 surgical specimens.Among 160 patients,27 patients were found to be positive for No.12 lymph nodes during routine pathological examination,with a positive rate of 16.8%.A total of 308 lymph nodes from 133 patients with negative routine pathological examinations were stained by immunohistochemistry.A total of 17 lymph nodes from 10 patients were found to be positive.The results showed that 37 of the 160 patients had No.12 lymph node metastasis,and the positive rate was 23.1%,which was 6.3%higher than that of routine pathological examination.Logistic multivariate analyses showed that the depth of invasion,lymph node metastasis in other groups,and clinical stage were independent risk factors for No.12 lymph node metastasis.The average follow-up time was 79.3 months,and the overall median survival time was 47.9 months.The survival time of the No.12 lymph node-negative group was 67.3±2.5Âmonths,the median survival time was 73.2 months;the survival time of the No.12 lymph node-positive group was(28.4±5.4)months,and the median survival time was 31.3 months.The survival time of the No.12 lymph node-negative group was significantly longer than that of the positive group(χ^(2)=12.75,P=0.000).Conclusion No.12 lymph node micrometastasis is a signal affecting the prognosis of patients with gastric cancer.Standardized dissection of No.12 lymph nodes is recommended for patients with gastric cancer who can undergo radical resection.展开更多
Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 death...Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 deaths in China, down about 27% from the corresponding period of last year. At present, the main causes of frequent production safety accidents are the low safety working position in coal mining, lack of crisis awareness, insufficient real-time supervision, insufficient attention to disaster prevention by various departments, high mining risk coefficient, illegal subcontracting, overcapacity, over-exploitation and inadequate safety management at the grass-roots level. However, in recent years, the number of accidents and deaths has decreased as compared with that of previous years, which shows that we have achieved certain results for the "safety first" coal enterprises in the past, and on the other hand, it shows that coal mine safety production is indeed very important. Although the coal mine safety management has made some progress, the current situation of safety in production is still very difficult, with more than large accidents occurring from time to time. These accidents reflect the problems of inadequate implementation of the main responsibilities of coal mining enterprises, repeated violations of laws and regulations, repeated punishment and improvement of supervision efficiency. Therefore, we must be alert at all times, strictly in accordance with the relevant rules and regulations of the coal mine, and standardize the operation.展开更多
With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value m...With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value method" is used to reserve fault coal pillars for coal mine faults, which can not only prevent the threat of coal mine water damage, but also reduce the stagnant coal resources. Therefore, the position of coal pillar line (the width of fault safety water barrier coal pillar) should be reasonably determined. It is imperative for aging or resource exhausted mines. At the same time, it also provides a powerful guarantee for prolonging the service life of the mine. The definition of fault coal pillar is that in order to reduce coal loss and avoid poor roadway stability caused by construction in fault zone, some necessary coal pillars of coal mine are arranged in fault (such as horizontal coal pillar and section coal pillar), which is called fault coal pillar. Water drainage coal pillar is to separate aquifer or goaf and other water bearing space from the workplace. This paper describes in detail the selection of the target layer of waterproof coal pillar, the basis and calculation method of waterproof coal (rock) pillar reservation, and the specific steps of calculating fault waterproof coal (rock) pillar by "trial value method", and describes in detail the quoted specific formula, corresponding parameters and the selection of the best point of "trial value method" by drawing method, which provides an effective reference basis for everyone.展开更多
At present, the demand of residents' life and social production for coal resources continues to increase, which also drives the rapid development of China’s coal industry. Coal mining technology gradually tends t...At present, the demand of residents' life and social production for coal resources continues to increase, which also drives the rapid development of China’s coal industry. Coal mining technology gradually tends to develop in the direction of automation. The introduction of automation technology can reduce the cost of human resources investment, improve the efficiency and quality of coal mining, and avoid safety accidents. It has practical significance to promote the automation and modernization development of coal mining industry. This paper mainly expounds the application of automation technology in coal mining, hoping to provide reference for the development of coal industry.展开更多
According to the document requirements, such as “Opinions on Constructing Dual Prevention Mechanism in Implementation of Work Guide for Preventing Serious Accidents” (Safety Committee Office [2016] No.11) and “Basi...According to the document requirements, such as “Opinions on Constructing Dual Prevention Mechanism in Implementation of Work Guide for Preventing Serious Accidents” (Safety Committee Office [2016] No.11) and “Basic Requirements and Scoring Method for Coal Mine Safety Production Standardization”, the Group Company has taken over the top-level design, sorted out the management difficulties of coal mine safety quality standardization, optimized the safety risk classification management method and hidden danger closed-loop management process based on in-depth study of the connotation of the dual prevention mechanism system for coal mine safety. The design and development of a coal mine intelligent dual-control integrated system including safety risk standard library, hidden danger investigation standard library, behavior control standard library, hazard source management and safety production standardization score and other functions. At present, the distributed and cross-regional "dual control" mechanism information platform system developed and deployed by the group company has been officially put into operation. It has the ability to remotely monitor the risk control and hidden danger investigation of the mines to which the group company belongs, expanded new channels of safety management and innovated the level of safety management information.展开更多
At present, the mine auxiliary transportation equipment at home and abroad mainly include monorail crane, rail clamping vehicle, toothed rail vehicle and trackless rubber tyred vehicle. Compared with other models, mon...At present, the mine auxiliary transportation equipment at home and abroad mainly include monorail crane, rail clamping vehicle, toothed rail vehicle and trackless rubber tyred vehicle. Compared with other models, monorail crane has strong climbing ability and flexible operation. The locomotive can realize continuous direct transportation without transfer in changeable slope and multi turnout, and has strong adaptability to roadway deformation and is not affected by floor deformation. Ponding or material accumulation. According to the power type, the monorail crane mainly includes explosion-proof diesel engine monorail crane, battery monorail crane and pneumatic monorail crane. Among them, the diesel monorail spreader has the advantages of great flexibility, easy access to power source, no danger of electric shock, stable operation, low cost and so on. With the increasing number of extraction roadways in roadway engineering and the increasing design length of roadways, the use of diesel monorail crane can well solve the difficult problem of material transportation.展开更多
Jizhong Energy Fengfeng Group Co., Ltd. was formed by restructuring the former Fengfeng Mining Bureau. Fengfeng Mining Bureau was established in September 1949 and restructured into a limited company in July 2003. On ...Jizhong Energy Fengfeng Group Co., Ltd. was formed by restructuring the former Fengfeng Mining Bureau. Fengfeng Mining Bureau was established in September 1949 and restructured into a limited company in July 2003. On June 30, 2008, Jizhong Energy Co., Ltd. was established through joint reorganization with Jinneng Group. Fengfeng Groups coal products are mainly high-quality coking coal, fat coal and thermal coal. In particular, the leading product-coking clean coal is a national protective scarce coal, which has the characteristics of low ash, low sulfur, low phosphorus, moderate volatile matter and strong cohesiveness, and is known as "industrial clean powder". The hydrogeologic conditions in Fengfeng Mining are complex, and the concealed water-conducting structures such as water-conducting collapse columns, faults and fissures are distributed in a concealed and isolated vertical dot shape with no regularity. The prediction and advance prevention of concealed water-conducting structures before mining are limited, and mine mining is seriously threatened by water disasters. Fengfeng Group pioneered the regional water control technology in coal mines. The regional control technology is a new water control technology developed in advance for large mining depth, high water pressure on coal floor, easy water inrush after coal mining, and before coal mining. Since this work was carried out in Jiulong Mine in 2012, it has achieved good results in water disaster control, fundamentally solved the water disaster problem in coal mines and ensured mine safety production.展开更多
文摘Sinking columns are one of the most hazardous geological structures in north Chine typed coal fields. To understand the sinking column formation, to judge if the columns are hazardous or not, the inner circle mechanism of groundwater in forming sinking columns in the relatively isolated areas was proposed according to the investigation on formation or distribution of sinking columns in some north China typed coal fields, such as Fengfeng, Xiangtai, Huaibei, Yangquan and so on. The heat generated by magma energized groundwater circulation and developed limestone karst in the relatively isolated areas. The CaCO3 solution accelerated by geothermal abnormality, the effect of high content of CO2 on dissolution and saturation of CaCO3 were discussed. Compared the forming conditions of the sinking columns developed in other coal mining areas in north China coal field, the paper deduced that the above factors collude karst development and sinking column formation, the columns in current geothermal areas are permeable and those in high coal rank areas or in paleo abnormally geothermal areas. The paper suggested that the sinking columns in the current abnormally geothermal areas were permeable, but those in the areas with high coal rank were not on contract.
文摘This paper takes No.52 return uphill roadway of Yangquhe coal mine as a research project. Based on the research, especially its geological condition, indoor experiments, numerical simulation and theoretical analysis were employed to determine the difficult coefficients of Yangquhe project. By using these means,the difficult coefficients of the deep rock engineering were determined. From a study of the effects of crustal stress and the roof mechanism on roadway stability, the transformation mechanism in Yangquhe coal mine has been determined. As a result of this research, the interactive support technology of prestressed cable mesh was developed and the technology tested in mining engineering, which proved to be feasible.
基金Supported by a grant from the Hebei Medical Science Research Project(No.20191831).
文摘Objective This study aimed to investigate the occurrence of No.12 lymph node micrometastasis in patients with gastric cancer and its relationship with clinicopathological parameters and prognosis.Methods A cohort of 160 gastric cancer patients who underwent gastrectomy and lymph node dissection were selected as the research subjects.The immunohistochemical method was used to detect the micrometastasis of No.12 lymph node sections with negative routine pathological detection.At the same time,the clinical data of patients were collected and followed up to analyze the clinical significance of No.12 lymph node micrometastasis.Results A total of 370 No.12 lymph nodes were detected in 160 surgical specimens.Among 160 patients,27 patients were found to be positive for No.12 lymph nodes during routine pathological examination,with a positive rate of 16.8%.A total of 308 lymph nodes from 133 patients with negative routine pathological examinations were stained by immunohistochemistry.A total of 17 lymph nodes from 10 patients were found to be positive.The results showed that 37 of the 160 patients had No.12 lymph node metastasis,and the positive rate was 23.1%,which was 6.3%higher than that of routine pathological examination.Logistic multivariate analyses showed that the depth of invasion,lymph node metastasis in other groups,and clinical stage were independent risk factors for No.12 lymph node metastasis.The average follow-up time was 79.3 months,and the overall median survival time was 47.9 months.The survival time of the No.12 lymph node-negative group was 67.3±2.5Âmonths,the median survival time was 73.2 months;the survival time of the No.12 lymph node-positive group was(28.4±5.4)months,and the median survival time was 31.3 months.The survival time of the No.12 lymph node-negative group was significantly longer than that of the positive group(χ^(2)=12.75,P=0.000).Conclusion No.12 lymph node micrometastasis is a signal affecting the prognosis of patients with gastric cancer.Standardized dissection of No.12 lymph nodes is recommended for patients with gastric cancer who can undergo radical resection.
文摘Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 deaths in China, down about 27% from the corresponding period of last year. At present, the main causes of frequent production safety accidents are the low safety working position in coal mining, lack of crisis awareness, insufficient real-time supervision, insufficient attention to disaster prevention by various departments, high mining risk coefficient, illegal subcontracting, overcapacity, over-exploitation and inadequate safety management at the grass-roots level. However, in recent years, the number of accidents and deaths has decreased as compared with that of previous years, which shows that we have achieved certain results for the "safety first" coal enterprises in the past, and on the other hand, it shows that coal mine safety production is indeed very important. Although the coal mine safety management has made some progress, the current situation of safety in production is still very difficult, with more than large accidents occurring from time to time. These accidents reflect the problems of inadequate implementation of the main responsibilities of coal mining enterprises, repeated violations of laws and regulations, repeated punishment and improvement of supervision efficiency. Therefore, we must be alert at all times, strictly in accordance with the relevant rules and regulations of the coal mine, and standardize the operation.
文摘With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value method" is used to reserve fault coal pillars for coal mine faults, which can not only prevent the threat of coal mine water damage, but also reduce the stagnant coal resources. Therefore, the position of coal pillar line (the width of fault safety water barrier coal pillar) should be reasonably determined. It is imperative for aging or resource exhausted mines. At the same time, it also provides a powerful guarantee for prolonging the service life of the mine. The definition of fault coal pillar is that in order to reduce coal loss and avoid poor roadway stability caused by construction in fault zone, some necessary coal pillars of coal mine are arranged in fault (such as horizontal coal pillar and section coal pillar), which is called fault coal pillar. Water drainage coal pillar is to separate aquifer or goaf and other water bearing space from the workplace. This paper describes in detail the selection of the target layer of waterproof coal pillar, the basis and calculation method of waterproof coal (rock) pillar reservation, and the specific steps of calculating fault waterproof coal (rock) pillar by "trial value method", and describes in detail the quoted specific formula, corresponding parameters and the selection of the best point of "trial value method" by drawing method, which provides an effective reference basis for everyone.
文摘At present, the demand of residents' life and social production for coal resources continues to increase, which also drives the rapid development of China’s coal industry. Coal mining technology gradually tends to develop in the direction of automation. The introduction of automation technology can reduce the cost of human resources investment, improve the efficiency and quality of coal mining, and avoid safety accidents. It has practical significance to promote the automation and modernization development of coal mining industry. This paper mainly expounds the application of automation technology in coal mining, hoping to provide reference for the development of coal industry.
文摘According to the document requirements, such as “Opinions on Constructing Dual Prevention Mechanism in Implementation of Work Guide for Preventing Serious Accidents” (Safety Committee Office [2016] No.11) and “Basic Requirements and Scoring Method for Coal Mine Safety Production Standardization”, the Group Company has taken over the top-level design, sorted out the management difficulties of coal mine safety quality standardization, optimized the safety risk classification management method and hidden danger closed-loop management process based on in-depth study of the connotation of the dual prevention mechanism system for coal mine safety. The design and development of a coal mine intelligent dual-control integrated system including safety risk standard library, hidden danger investigation standard library, behavior control standard library, hazard source management and safety production standardization score and other functions. At present, the distributed and cross-regional "dual control" mechanism information platform system developed and deployed by the group company has been officially put into operation. It has the ability to remotely monitor the risk control and hidden danger investigation of the mines to which the group company belongs, expanded new channels of safety management and innovated the level of safety management information.
文摘At present, the mine auxiliary transportation equipment at home and abroad mainly include monorail crane, rail clamping vehicle, toothed rail vehicle and trackless rubber tyred vehicle. Compared with other models, monorail crane has strong climbing ability and flexible operation. The locomotive can realize continuous direct transportation without transfer in changeable slope and multi turnout, and has strong adaptability to roadway deformation and is not affected by floor deformation. Ponding or material accumulation. According to the power type, the monorail crane mainly includes explosion-proof diesel engine monorail crane, battery monorail crane and pneumatic monorail crane. Among them, the diesel monorail spreader has the advantages of great flexibility, easy access to power source, no danger of electric shock, stable operation, low cost and so on. With the increasing number of extraction roadways in roadway engineering and the increasing design length of roadways, the use of diesel monorail crane can well solve the difficult problem of material transportation.
文摘Jizhong Energy Fengfeng Group Co., Ltd. was formed by restructuring the former Fengfeng Mining Bureau. Fengfeng Mining Bureau was established in September 1949 and restructured into a limited company in July 2003. On June 30, 2008, Jizhong Energy Co., Ltd. was established through joint reorganization with Jinneng Group. Fengfeng Groups coal products are mainly high-quality coking coal, fat coal and thermal coal. In particular, the leading product-coking clean coal is a national protective scarce coal, which has the characteristics of low ash, low sulfur, low phosphorus, moderate volatile matter and strong cohesiveness, and is known as "industrial clean powder". The hydrogeologic conditions in Fengfeng Mining are complex, and the concealed water-conducting structures such as water-conducting collapse columns, faults and fissures are distributed in a concealed and isolated vertical dot shape with no regularity. The prediction and advance prevention of concealed water-conducting structures before mining are limited, and mine mining is seriously threatened by water disasters. Fengfeng Group pioneered the regional water control technology in coal mines. The regional control technology is a new water control technology developed in advance for large mining depth, high water pressure on coal floor, easy water inrush after coal mining, and before coal mining. Since this work was carried out in Jiulong Mine in 2012, it has achieved good results in water disaster control, fundamentally solved the water disaster problem in coal mines and ensured mine safety production.
