基于结构面网络模拟的节理岩质边坡可靠性分析
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摘要
在节理岩质边坡的稳定性分析中,往往很少考虑结构面的随机分布特征。结构面网络模拟能较好地模拟结构面的随机分布,因此,本文将结构面网络模拟应用于节理岩质边坡的稳定性分析中。首先,运用岩体结构面网络模拟技术,建立岩质边坡的结构面网络模型。然后,将模拟的结果与有限元强度折减法相结合求取边坡的安全系数。最后,对边坡进行一定次数的结构面网络模拟并得到对应的安全系数,进而进行节理岩质边坡的可靠性分析。工程实例结果表明:(1)节理岩质边坡的稳定性主要受坡面附近结构面的数量及切割组合关系影响,结构面的数量越多,连通情况越好,则边坡稳定性安全系数越小;(2)该边坡的平均稳定性安全系数为3.06,失效概率为5%,表明该边坡有较高的可靠性,这与实际情况比较一致。本文的分析方法主要考虑了结构面的随机分布特征,能为节理岩质边坡的稳定性分析提供一条新的思路和方法。
The random distribution characteristic of discontinuities is always rarely considered when analysing the stability of jointed rock slope. Joint network simulation can simulate the random distribution of discontinuities. So this method is applied to analysing the stability of jointed rock slopes. Firstly,the joint network simulation method is used to establish the joint network model of the slope. Then the result is combined with shear strength reduction method to calculate the safety factor of the slope. Subsequently,many joint network simulations and their relative safety factors are used to analyse the reliability of the slope. The result of a real project shows the following.( 1)The stability of the rock slope is mainly controlled by the quantity and combination relationship of discontinuities.The more is the discontinuities' quantity and persistence,the lower is the slope's safety factor.( 2) The average safety factor of the slope is 3. 06 and its probability of failure is 5%,which indicate the good reliability of the slope.This result is in accordance with the real condition of the slope. The analysis method in this paper mainly considersthe random distribution of discontinuities,and it presents a new way to analyse the stability of jointed rock slope.
The random distribution characteristic of discontinuities is always rarely considered when analysing the stability of jointed rock slope. Joint network simulation can simulate the random distribution of discontinuities. So this method is applied to analysing the stability of jointed rock slopes. Firstly,the joint network simulation method is used to establish the joint network model of the slope. Then the result is combined with shear strength reduction method to calculate the safety factor of the slope. Subsequently,many joint network simulations and their relative safety factors are used to analyse the reliability of the slope. The result of a real project shows the following.( 1)The stability of the rock slope is mainly controlled by the quantity and combination relationship of discontinuities.The more is the discontinuities' quantity and persistence,the lower is the slope's safety factor.( 2) The average safety factor of the slope is 3. 06 and its probability of failure is 5%,which indicate the good reliability of the slope.This result is in accordance with the real condition of the slope. The analysis method in this paper mainly considersthe random distribution of discontinuities,and it presents a new way to analyse the stability of jointed rock slope.
引文
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[13]林杭,曹平,李江腾,等.层状岩质边坡破坏模式及稳定性的数值分析[J].岩土力学,2010,31(10):3300~3304.Lin Hang,Cao Ping,Li Jiangteng,et al.Numerical analysis of failure modes and stability of stratified rock slopes[J].Rock and Soil Mechanics,2010,31(10):3300~3304.
[14]李新坡,何思明.节理岩质边坡破坏过程的PFC2D数值模拟分析[J].四川大学学报,2010,42(增1):70~75.Li Xinpo,He Siming.Numerical analysis of the failure of heavily jointed rock slopes using PFC2D[J].Journal of Sichuan University,2010,42(S1):70~75.
[15]贺续文,刘忠,廖彪,等.基于离散元法的节理岩体边坡稳定性分析[J].岩土力学,2011,32(7):2199~2204.He Xuwen,Liu Zhong,Liao Biao,et al.Stability analysis of jointed rock slopes based on discrete element method[J].Rock and Soil Mechanics,2011,32(7):2199~2204.
[16]贾洪彪,马淑芝,唐辉明,等.岩体结构面网络三维模拟的工程应用研究[M].北京:科学出版社,2008.Jia Hongbiao,Ma Shuzhi,Tang Huiming,et al.Engineering application research on rockmass three-dimentional network simulation[M].Beijing:Science Press,2008.
[17]谭文辉,蔡美峰.边坡工程广义可靠性理论与实践[M].北京:科学出版社,2010.Tan Wenhui,Cai Meifeng.General slope engineering reliability concept and its application[M].Beijing:Science Press,2010.
[2]郭映忠.节理边坡的稳定性评价[J].地球与环境,2005,33(增1):1~6.Guo Yingzhong.Appraisement of stability of a jointed slope[J].Earth and Environment,2005,33(S1):1~6.
[3]伍法权.岩质高陡边坡变形与稳定性评价工程地质工作方法[J].工程地质学报,2004,12(增1):199~211.Wu Faquan.Engineering geology assessment procedure for deformation and stability of high steep rock slopes[J].Journal of Engineering Geology,2004,12(S1):199~211.
[4]王书法,李树忱,李术才,等.节理岩质边坡变形的DDA模拟[J].岩土力学,2002,23(3):352~354.Wang Shufa,Li Shuchen,Li Shucai,et al.Numerical simulation of deformation of jointed rock slope by discontinuous deformation analysis DDA[J].Rock and Soil Mechanics,2002,23(3):352~354.
[5]郑颖人,赵尚毅,邓卫东.岩质边坡破坏机制有限元数值模拟分析[J].岩石力学与工程学报,2003,22(12):1943~1952.Zheng Yingren,Zhao Shangyi,Deng Weidong.Numerical simulation on failure mechanism of rock slope by strength reduction FEM[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(12):1943~1952.
[6]赵尚毅,郑颖人,邓卫东.用有限元强度折减法进行节理岩质边坡稳定性分析[J].岩石力学与工程学报,2003,22(2):254~260.Zhao Shangyi,Zheng Yingren,Deng Weidong.Stability analysis on jointed rock slope by strength reduction FEM[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(2):254~260.
[7]汤明高.节理岩体高边坡稳定性研究及应用——以云南小湾水电工程6#山梁为例[硕士学位论文][D].成都:成都理工大学,2004.Tang Minggao.Research and its application of jointed rock high slope stability—Take slope 6#of Xiaowan Hydropower Project of Yunnan Provinee for instance[Thesis of Master][D].Chengdu:Chengdu University of Technology,2004.
[8]李连崇,唐春安,邢军,等.节理岩质边坡变形破坏的RFPA模拟分析[J].东北大学学报,2006,27(5):559~562.Li Lianchong,Tang Chun'an,Xing Jun,et al.Numerical simulation and analysis of deformation and failure of jointed rock slopes by RFPA-slope[J].Journal of Northeastern University,2006,27(5):559~562.
[9]吴顺川,金爱兵,高永涛.基于遍布节理模型的边坡稳定性强度折减法分析[J].岩土力学,2006,27(4):537~542.Wu Shunchuan,Jin Aibing,Gao Yongtao.Slope stability analysis by strength reduction method based on ubiquitous-joint model[J].Rock and Soil Mechanics,2006,27(4):537~542.
[10]蒋青青,胡毅夫,赖伟明.层状岩质边坡遍布节理模型的三维稳定性分析[J].岩土力学,2009,30(3):712~716.Jiang Qingqing,Hu Yifu,Lai Weiming.Three-dimensional stability analysis of stratified rock slope based on ubiquitous-joint model[J].Rock and Soil Mechanics,2009,30(3):712~716.
[11]周家文,徐卫亚,石崇.基于3DEC的节理岩体边坡地震影响下的楔体稳定性分析[J].岩石力学与工程学报,2007,26(增1):3402~3409.Zhou Jiawen,Xu Weiya,Shi Chong.Wedge stability analysis of jointed rockmass slope considering seismic influences based on3DEC[J].Chinese Journal of Rock Mechanics and Engineering.2007,26(S1):3402~3409.
[12]沈金瑞,林杭.多组节理边坡稳定性FLAC3D数值分析[J].中国安全科学报,2007,17(1):29~33.Shen Jinrui,Lin Hang.The numerical analysis on the stability of slope with several sets of joints by FLAC3D[J].China Safety Science Journal,2007,17(1):29~33.
[13]林杭,曹平,李江腾,等.层状岩质边坡破坏模式及稳定性的数值分析[J].岩土力学,2010,31(10):3300~3304.Lin Hang,Cao Ping,Li Jiangteng,et al.Numerical analysis of failure modes and stability of stratified rock slopes[J].Rock and Soil Mechanics,2010,31(10):3300~3304.
[14]李新坡,何思明.节理岩质边坡破坏过程的PFC2D数值模拟分析[J].四川大学学报,2010,42(增1):70~75.Li Xinpo,He Siming.Numerical analysis of the failure of heavily jointed rock slopes using PFC2D[J].Journal of Sichuan University,2010,42(S1):70~75.
[15]贺续文,刘忠,廖彪,等.基于离散元法的节理岩体边坡稳定性分析[J].岩土力学,2011,32(7):2199~2204.He Xuwen,Liu Zhong,Liao Biao,et al.Stability analysis of jointed rock slopes based on discrete element method[J].Rock and Soil Mechanics,2011,32(7):2199~2204.
[16]贾洪彪,马淑芝,唐辉明,等.岩体结构面网络三维模拟的工程应用研究[M].北京:科学出版社,2008.Jia Hongbiao,Ma Shuzhi,Tang Huiming,et al.Engineering application research on rockmass three-dimentional network simulation[M].Beijing:Science Press,2008.
[17]谭文辉,蔡美峰.边坡工程广义可靠性理论与实践[M].北京:科学出版社,2010.Tan Wenhui,Cai Meifeng.General slope engineering reliability concept and its application[M].Beijing:Science Press,2010.
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