A new method is proposed for slope optimization design based on the limit curve method, where the slope is in the limit equilibrium state when the limit slope curve determined by the slip-line field theory and the slo...A new method is proposed for slope optimization design based on the limit curve method, where the slope is in the limit equilibrium state when the limit slope curve determined by the slip-line field theory and the slope intersect at the toe of the slope. Compared with the strength reduction (SR) method, finite element limit analysis method, and the SR method based on Davis algorithm, the new method is suitable for determining the slope stability and limit slope angle (LSA). The optimal slope shape is determined based on a series of slope heights and LSA values, which increases the LSA by 2.45°-11.14° and reduces an invalid overburden amount of rocks by 9.15%, compared with the space mechanics theory. The proposed method gives the objective quantification index of instability criterion, and results in a significant engineering economy.展开更多
The numerical calculation method is widely used in the evaluation of slope stability,but it cannot take the randomness and fuzziness into account that exist in rock and soil engineering objectively.The fuzzy optimizat...The numerical calculation method is widely used in the evaluation of slope stability,but it cannot take the randomness and fuzziness into account that exist in rock and soil engineering objectively.The fuzzy optimization theory is thus introduced to the evaluation of slope stability by this paper and a method of fuzzy optimal selection of similar slopes is put forward to analyze slope stability.By comparing the relative membership degrees that the evaluated object sample of slope is similar to the source samples of which the stabilities are detected clearly,the source sample with the maximal relative membership degree will be chosen as the best similar one to the object sample,and the stability of the object sample can be evaluated by that of the best similar source sample.In the process many uncertain influential factors are considered and characteristics and knowledge of the source samples are obtained.The practical calculation indicates that it can achieve good results to evaluate slope stability by using this method.展开更多
In this research, determination of final slope for Maiduk copper mine of Kerman is investigated according to destabilizing factors of the mine. The development of the Maiduk Mine caused the extension of the mine area ...In this research, determination of final slope for Maiduk copper mine of Kerman is investigated according to destabilizing factors of the mine. The development of the Maiduk Mine caused the extension of the mine area and also withdrawal of its wall. So, optimizing possibility of mine slope is essential. Finally,the magnitude of optimized slopes for different walls of the mine in association with executive commands with better factors of safety is provided. The results show that the most important destabilizer factors are the presence of water and pore pressure in the faults and the main joints. With the omission of pore pressure, mine wall for the designed depth is quite stable. This requires a drainage pattern in the lifetime of the mine. In an optimistic point of view, the minimum factor of safety of the wall will be 2.81 even without drainage. This conclusion allows optimizing the slope to its maximum magnitude of 51 degree. With the pessimistic engineering judgment and with the higher SF, the magnitude of the slope is optimized to 47 degree.展开更多
Based on the exploration of the engineering geology and the rock mechan-ics testing, limit equilibrium analysis method was adopted to calculate the stability of the Huogeqi Copper Mine slope, the results show that the...Based on the exploration of the engineering geology and the rock mechan-ics testing, limit equilibrium analysis method was adopted to calculate the stability of the Huogeqi Copper Mine slope, the results show that the original slope angle is too con-servative and the slope have the potential of more preferable slope angle. In order to discuss the possibility of slope angle enhancement, sensitivity analysis of parameters related to limit state slope was made. Quantitatively determined angle value of the add-ing and the optimal slope angle was obtained. The study having performed showed that it is not only useful for the safety control of open-pit mine slope but also for the open-pit mine design for the similar geological condition.展开更多
In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and ...In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and used a combination of the two-dimensional limit equilibrium method and three-dimensional numerical simulation to optimize the shape of the east slope.By selecting a typical calculation profile based on the Bishop method and the residual thrust method in the two-dimensional rigid body limit equilibrium method,this research carried out the stability analysis of the profile slope,and preliminarily designed the slope shape of the profile position meeting the requirements of the safety reserve coefficient and stripping ratio.Based on the three-dimensional finite element strength reduction method,this paper investigated the reasonably change of the width of the transport plate to solve the problem of the slope shape that does not meet the requirements of safety reserve coefficient and stripping ratio,and established a three-dimensional numerical simulation model of various schemes.It also studied the influence of different tracking distances and slope angles on slope stability,calculated the threedimensional stability of the slope under different spatial forms,then determined the optimal tracking distance and optimal slope angle,and further optimize the slope stability and stripping ratio.The results show that:when the width of the transport plate of the DBS3 section slope is 8 m,it does not meet the requirement of safety reserve coefficient 1.2;when the width of the transport plate is set to 24 m,it meets the requirement of a safety reserve coefficient of 1.2 and an economic stripping ratio of not more than 8.0 m^(3)/t.The three-dimensional numerical simulation results concluded that the optimal tracking distance on the east side is 50 m,and the optimal slope angle is 35.After the optimization design of a two-dimensional and three-dimensional slope shape,2.456 million tons of coal resources were mined,creating a profit of about 21.1268 million yuan.It not only prevents landslide disasters,but also further improve the recovery rate of coal resources.展开更多
基金Project(JJKH20180450KJ)supported by Education Department of Jilin Province,ChinaProject(20166008)supported by the Science and Technology Bureau of Jilin Province,China
文摘A new method is proposed for slope optimization design based on the limit curve method, where the slope is in the limit equilibrium state when the limit slope curve determined by the slip-line field theory and the slope intersect at the toe of the slope. Compared with the strength reduction (SR) method, finite element limit analysis method, and the SR method based on Davis algorithm, the new method is suitable for determining the slope stability and limit slope angle (LSA). The optimal slope shape is determined based on a series of slope heights and LSA values, which increases the LSA by 2.45°-11.14° and reduces an invalid overburden amount of rocks by 9.15%, compared with the space mechanics theory. The proposed method gives the objective quantification index of instability criterion, and results in a significant engineering economy.
基金Sponsored by the Natural Science Foundation of Liaoning Province in China(Grant No.20022106).
文摘The numerical calculation method is widely used in the evaluation of slope stability,but it cannot take the randomness and fuzziness into account that exist in rock and soil engineering objectively.The fuzzy optimization theory is thus introduced to the evaluation of slope stability by this paper and a method of fuzzy optimal selection of similar slopes is put forward to analyze slope stability.By comparing the relative membership degrees that the evaluated object sample of slope is similar to the source samples of which the stabilities are detected clearly,the source sample with the maximal relative membership degree will be chosen as the best similar one to the object sample,and the stability of the object sample can be evaluated by that of the best similar source sample.In the process many uncertain influential factors are considered and characteristics and knowledge of the source samples are obtained.The practical calculation indicates that it can achieve good results to evaluate slope stability by using this method.
文摘In this research, determination of final slope for Maiduk copper mine of Kerman is investigated according to destabilizing factors of the mine. The development of the Maiduk Mine caused the extension of the mine area and also withdrawal of its wall. So, optimizing possibility of mine slope is essential. Finally,the magnitude of optimized slopes for different walls of the mine in association with executive commands with better factors of safety is provided. The results show that the most important destabilizer factors are the presence of water and pore pressure in the faults and the main joints. With the omission of pore pressure, mine wall for the designed depth is quite stable. This requires a drainage pattern in the lifetime of the mine. In an optimistic point of view, the minimum factor of safety of the wall will be 2.81 even without drainage. This conclusion allows optimizing the slope to its maximum magnitude of 51 degree. With the pessimistic engineering judgment and with the higher SF, the magnitude of the slope is optimized to 47 degree.
基金Supported by the National Nature Science Foundation of China(50074002)
文摘Based on the exploration of the engineering geology and the rock mechan-ics testing, limit equilibrium analysis method was adopted to calculate the stability of the Huogeqi Copper Mine slope, the results show that the original slope angle is too con-servative and the slope have the potential of more preferable slope angle. In order to discuss the possibility of slope angle enhancement, sensitivity analysis of parameters related to limit state slope was made. Quantitatively determined angle value of the add-ing and the optimal slope angle was obtained. The study having performed showed that it is not only useful for the safety control of open-pit mine slope but also for the open-pit mine design for the similar geological condition.
基金funded by Foundation Projects:National Natural Science Foundation of China (No.52204136)Natural Sci-ence Foundation of Liaoning Province (No.2022-BS-327).
文摘In order to improve the stability of the slope and prevent the occurrence of landslide disaster,this study took the east slope of the first mining area of Zhundong Open-pit Coal Mine as the engineering background,and used a combination of the two-dimensional limit equilibrium method and three-dimensional numerical simulation to optimize the shape of the east slope.By selecting a typical calculation profile based on the Bishop method and the residual thrust method in the two-dimensional rigid body limit equilibrium method,this research carried out the stability analysis of the profile slope,and preliminarily designed the slope shape of the profile position meeting the requirements of the safety reserve coefficient and stripping ratio.Based on the three-dimensional finite element strength reduction method,this paper investigated the reasonably change of the width of the transport plate to solve the problem of the slope shape that does not meet the requirements of safety reserve coefficient and stripping ratio,and established a three-dimensional numerical simulation model of various schemes.It also studied the influence of different tracking distances and slope angles on slope stability,calculated the threedimensional stability of the slope under different spatial forms,then determined the optimal tracking distance and optimal slope angle,and further optimize the slope stability and stripping ratio.The results show that:when the width of the transport plate of the DBS3 section slope is 8 m,it does not meet the requirement of safety reserve coefficient 1.2;when the width of the transport plate is set to 24 m,it meets the requirement of a safety reserve coefficient of 1.2 and an economic stripping ratio of not more than 8.0 m^(3)/t.The three-dimensional numerical simulation results concluded that the optimal tracking distance on the east side is 50 m,and the optimal slope angle is 35.After the optimization design of a two-dimensional and three-dimensional slope shape,2.456 million tons of coal resources were mined,creating a profit of about 21.1268 million yuan.It not only prevents landslide disasters,but also further improve the recovery rate of coal resources.
