Source identification and deformation analysis of disaster bodies are the main contents of high-steep slope risk assessment,the establishment of high-precision model and the quantification of the fine geometric featur...Source identification and deformation analysis of disaster bodies are the main contents of high-steep slope risk assessment,the establishment of high-precision model and the quantification of the fine geometric features of the slope are the prerequisites for the above work.In this study,based on the UAV remote sensing technology in acquiring refined model and quantitative parameters,a semi-automatic dangerous rock identification method based on multi-source data is proposed.In terms of the periodicity UAV-based deformation monitoring,the monitoring accuracy is defined according to the relative accuracy of multi-temporal point cloud.Taking a high-steep slope as research object,the UAV equipped with special sensors was used to obtain multi-source and multitemporal data,including high-precision DOM and multi-temporal 3D point clouds.The geometric features of the outcrop were extracted and superimposed with DOM images to carry out semi-automatic identification of dangerous rock mass,realizes the closed-loop of identification and accuracy verification;changing detection of multi-temporal 3D point clouds was conducted to capture deformation of slope with centimeter accuracy.The results show that the multi-source data-based semiautomatic dangerous rock identification method can complement each other to improve the efficiency and accuracy of identification,and the UAV-based multi-temporal monitoring can reveal the near real-time deformation state of slopes.展开更多
The bridge piles located in high-steep slopes not only endure the loads from superstructure, but also the residual sliding force as well as the resistance from the slope. By introducing the Winkler foundation theory, ...The bridge piles located in high-steep slopes not only endure the loads from superstructure, but also the residual sliding force as well as the resistance from the slope. By introducing the Winkler foundation theory, the mechanical model of piles-soils-slopes system was established, and the equilibrium differential equations of pile were derived. Moreover, an analytic solution for identifying the model parameters was provided by means of power series method. A project with field measurement was compared with the proposed method. It is indicated that the lateral loads have great influences on the pile, the steep slope effect is indispensable, and reasonable diameter of the pile could enhance the bending ability. The internal force and displacements of pile are largely based upon the horizontal loads applied on pile, especially in upper part.展开更多
According to the rock engineering property and stability of high-steep open-pitslopes, various factors were collected on the basis of rock engineering system (RSE) theory,and the interaction matrix of stability evalua...According to the rock engineering property and stability of high-steep open-pitslopes, various factors were collected on the basis of rock engineering system (RSE) theory,and the interaction matrix of stability evaluation was established.Then, the stabilityevaluation index (S_p) of the slope was put forward.Ranges of the S_p value and the correspondingstable state were given on the basis of thirty-six samples.It is found that the followingrelationships exist: unstable (easy landslide): S_p<-0.20; mid-stable (may be landslide):-0.20<S_p<0.63; stable (no landslide): S_p>0.63.Finally, the stability evaluation indexwas applied on the high-steep open-pit slope of one mine.Analysis results and monitoringdata indicate that the index meets the necessity of the property of slope engineering, and ithas an important engineering purpose for landslide forecasting of high-steep slopes.展开更多
Engineered cementitious composites(ECC)are highly ductile materials with excellent crack control capabilities,making them well-suited for structural applications requiring enhanced durability and resilience.In mountai...Engineered cementitious composites(ECC)are highly ductile materials with excellent crack control capabilities,making them well-suited for structural applications requiring enhanced durability and resilience.In mountainous engineering construction,stabilizing high-steep slopes presents a significant challenge,with sheet-pile walls commonly employed to improve seismic stability.To assess the effectiveness of ECC in such applications,this study conducted two comparative shaking table tests to investigate the seismic performance of high-steep slopes supported by ECC sheet-pile walls.The failure modes,acceleration responses,dynamic earth pressure responses,bending moments of anti-sliding piles,and lateral displacement responses of the ECC-supported slope were systematically analyzed and compared with those of slopes supported by traditional reinforced concrete(RC)sheet-pile walls.The test results indicate that ECC-supported slopes exhibited significantly better seismic performance than RC-supported slopes.ECC sheet-pile wall maintained structural integrity at higher seismic intensities(PGA=1.2g)compared with RC walls,which failed at PGA=1.0g.Under the same seismic loading,ECC-supported slopes demonstrated lower acceleration amplitudes,acceleration amplification factors,acceleration response spectra,and dynamic amplification factors compared with RC-supported slopes.Moreover,the dynamic bending moments of ECC anti-slide piles were approximately 70%-90% of those of RC anti-slide piles.Significant differences were also observed between the two support systems in terms of dynamic earth pressure distribution and residual displacement development.These findings confirmed the potential of ECC as an advanced material for enhancing high-steep slope stability in mountainous regions,providing a valuable reference for slope stabilization and landslide mitigation in seismic areas.展开更多
随着高速铁路的快速发展,其节能减碳问题倍受关注。将绿色电能用于牵引供电是有效的节能降耗手段,若将高速铁路的大量再生制动能量合理利用,由废电转为绿电,亦可推进牵引供电用能的清洁能源化。针对光伏接入牵引供电系统条件下高速铁路...随着高速铁路的快速发展,其节能减碳问题倍受关注。将绿色电能用于牵引供电是有效的节能降耗手段,若将高速铁路的大量再生制动能量合理利用,由废电转为绿电,亦可推进牵引供电用能的清洁能源化。针对光伏接入牵引供电系统条件下高速铁路长大坡道地面式再生制动能量混合储能系统容量优化配置问题,在分析高速铁路长大坡道绿电资源获取方式、光伏出力和制动能量特性的基础上,考虑绿电牵引场景下长大坡道混合储能系统不同时间维度下功率特性及各运行工况能量特性,给出基于储能需求密度的混合储能系统再生制动与光伏闲时能量并行回收的分段配置方案;针对不同储能介质的特性分别建立优化模型,利用基于Levy飞行的改进模拟退火算法(simulated annealing algorithm based on Levy flight,LESA)进行优化求解;最后,选取西成高铁某牵引变电所实测数据进行算例分析。结果表明,所提优化配置策略能够在同时考虑光伏出力与再生制动能量线内外绿电的情况下,实现对高铁长大坡道混合储能系统容量的优化配置,有效提高牵引供电系统绿电占比,缩短储能系统成本回收年限,可为高速铁路储能系统工程化应用提供参考,促进轨道交通牵引用能绿色低碳化发展。展开更多
基金financially supported by the Youth Innovation Promotion Association CAS(No.2021325)the National Natural Science Foundation of China(Nos.52179117,U21A20159)the Research project of Panzhihua Iron and Steel Group Mining Co.,Ltd.(No.2021-P6-D2-05)。
文摘Source identification and deformation analysis of disaster bodies are the main contents of high-steep slope risk assessment,the establishment of high-precision model and the quantification of the fine geometric features of the slope are the prerequisites for the above work.In this study,based on the UAV remote sensing technology in acquiring refined model and quantitative parameters,a semi-automatic dangerous rock identification method based on multi-source data is proposed.In terms of the periodicity UAV-based deformation monitoring,the monitoring accuracy is defined according to the relative accuracy of multi-temporal point cloud.Taking a high-steep slope as research object,the UAV equipped with special sensors was used to obtain multi-source and multitemporal data,including high-precision DOM and multi-temporal 3D point clouds.The geometric features of the outcrop were extracted and superimposed with DOM images to carry out semi-automatic identification of dangerous rock mass,realizes the closed-loop of identification and accuracy verification;changing detection of multi-temporal 3D point clouds was conducted to capture deformation of slope with centimeter accuracy.The results show that the multi-source data-based semiautomatic dangerous rock identification method can complement each other to improve the efficiency and accuracy of identification,and the UAV-based multi-temporal monitoring can reveal the near real-time deformation state of slopes.
基金Project(51408066)supported by the National Natural Science Foundation of China
文摘The bridge piles located in high-steep slopes not only endure the loads from superstructure, but also the residual sliding force as well as the resistance from the slope. By introducing the Winkler foundation theory, the mechanical model of piles-soils-slopes system was established, and the equilibrium differential equations of pile were derived. Moreover, an analytic solution for identifying the model parameters was provided by means of power series method. A project with field measurement was compared with the proposed method. It is indicated that the lateral loads have great influences on the pile, the steep slope effect is indispensable, and reasonable diameter of the pile could enhance the bending ability. The internal force and displacements of pile are largely based upon the horizontal loads applied on pile, especially in upper part.
基金Supported by the National Natural Science Foundation of China(50874042)
文摘According to the rock engineering property and stability of high-steep open-pitslopes, various factors were collected on the basis of rock engineering system (RSE) theory,and the interaction matrix of stability evaluation was established.Then, the stabilityevaluation index (S_p) of the slope was put forward.Ranges of the S_p value and the correspondingstable state were given on the basis of thirty-six samples.It is found that the followingrelationships exist: unstable (easy landslide): S_p<-0.20; mid-stable (may be landslide):-0.20<S_p<0.63; stable (no landslide): S_p>0.63.Finally, the stability evaluation indexwas applied on the high-steep open-pit slope of one mine.Analysis results and monitoringdata indicate that the index meets the necessity of the property of slope engineering, and ithas an important engineering purpose for landslide forecasting of high-steep slopes.
基金supported by the National Natural Science Foundation of China(Grant Nos.U2268213,52178312)the S&T Program of Hebei(Grant No.23567602H)。
文摘Engineered cementitious composites(ECC)are highly ductile materials with excellent crack control capabilities,making them well-suited for structural applications requiring enhanced durability and resilience.In mountainous engineering construction,stabilizing high-steep slopes presents a significant challenge,with sheet-pile walls commonly employed to improve seismic stability.To assess the effectiveness of ECC in such applications,this study conducted two comparative shaking table tests to investigate the seismic performance of high-steep slopes supported by ECC sheet-pile walls.The failure modes,acceleration responses,dynamic earth pressure responses,bending moments of anti-sliding piles,and lateral displacement responses of the ECC-supported slope were systematically analyzed and compared with those of slopes supported by traditional reinforced concrete(RC)sheet-pile walls.The test results indicate that ECC-supported slopes exhibited significantly better seismic performance than RC-supported slopes.ECC sheet-pile wall maintained structural integrity at higher seismic intensities(PGA=1.2g)compared with RC walls,which failed at PGA=1.0g.Under the same seismic loading,ECC-supported slopes demonstrated lower acceleration amplitudes,acceleration amplification factors,acceleration response spectra,and dynamic amplification factors compared with RC-supported slopes.Moreover,the dynamic bending moments of ECC anti-slide piles were approximately 70%-90% of those of RC anti-slide piles.Significant differences were also observed between the two support systems in terms of dynamic earth pressure distribution and residual displacement development.These findings confirmed the potential of ECC as an advanced material for enhancing high-steep slope stability in mountainous regions,providing a valuable reference for slope stabilization and landslide mitigation in seismic areas.
文摘随着高速铁路的快速发展,其节能减碳问题倍受关注。将绿色电能用于牵引供电是有效的节能降耗手段,若将高速铁路的大量再生制动能量合理利用,由废电转为绿电,亦可推进牵引供电用能的清洁能源化。针对光伏接入牵引供电系统条件下高速铁路长大坡道地面式再生制动能量混合储能系统容量优化配置问题,在分析高速铁路长大坡道绿电资源获取方式、光伏出力和制动能量特性的基础上,考虑绿电牵引场景下长大坡道混合储能系统不同时间维度下功率特性及各运行工况能量特性,给出基于储能需求密度的混合储能系统再生制动与光伏闲时能量并行回收的分段配置方案;针对不同储能介质的特性分别建立优化模型,利用基于Levy飞行的改进模拟退火算法(simulated annealing algorithm based on Levy flight,LESA)进行优化求解;最后,选取西成高铁某牵引变电所实测数据进行算例分析。结果表明,所提优化配置策略能够在同时考虑光伏出力与再生制动能量线内外绿电的情况下,实现对高铁长大坡道混合储能系统容量的优化配置,有效提高牵引供电系统绿电占比,缩短储能系统成本回收年限,可为高速铁路储能系统工程化应用提供参考,促进轨道交通牵引用能绿色低碳化发展。
