基于单元安全度的黄土边坡动力稳定性分析
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摘要
【目的】分析黄土地区复杂边坡局部及整体的稳定性,为该地区边坡的稳定加固及基础设施建设提供参考。【方法】引入单元安全度概念,基于摩尔库伦准则得到单元安全系数,结合有限差分法数值模型编制相应的外部计算模块,分析西气东输二期工程某黄土边坡的稳定性。【结果】计算得到了复杂边坡在动力荷载作用下的安全度分布,进而对边坡在动力荷载作用下的局部和整体稳定性的判断表明,在动力荷载作用下,边坡局部出现了先于整体的屈服,在坡体上沿和边坡坡体凸出部位出现了拉伸破坏。【结论】通过强度折减法得到边坡的整体安全系数,利用其对单元安全度方法合理性的验证表明,单元安全度方法在评价复杂边坡稳定性时优于其他方法。
【Objective】 In order to make some references for improving slope and constructing infrastructures in the loess region,the local and overall stability of loess slope was analyzed.【Method】 The zone safety degree concept was introduced,and then the zone safety degree was obtained based the Mohr-Coulomb failure criterion.Finally,finite difference method and numerical model were used,and the corresponding external calculation module was prepared,loess slope stability was analyzed with this new method in West-East gas pipeline project.【Result】 The zone safety degree distributions of general loess slope were obtained by calculating under the dynamic loads.The results showed that the local yield occured before the overall yield during dynamic loads acting,and that the tensile failure appeared along the protruding parts and the top of the loess slope.【Conclusion】 The feasibility of the zone safety degree method was verified by the overall safety factor of loess slope throngh the strength reduction method,and the verified results showed that the zone safety degree method is superior to the other methods in evaluating slope stability.
【Objective】 In order to make some references for improving slope and constructing infrastructures in the loess region,the local and overall stability of loess slope was analyzed.【Method】 The zone safety degree concept was introduced,and then the zone safety degree was obtained based the Mohr-Coulomb failure criterion.Finally,finite difference method and numerical model were used,and the corresponding external calculation module was prepared,loess slope stability was analyzed with this new method in West-East gas pipeline project.【Result】 The zone safety degree distributions of general loess slope were obtained by calculating under the dynamic loads.The results showed that the local yield occured before the overall yield during dynamic loads acting,and that the tensile failure appeared along the protruding parts and the top of the loess slope.【Conclusion】 The feasibility of the zone safety degree method was verified by the overall safety factor of loess slope throngh the strength reduction method,and the verified results showed that the zone safety degree method is superior to the other methods in evaluating slope stability.
引文
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[8]陈祖煜,汪小刚,杨健,等.岩质边坡稳定分析:原理、方法、程序[M].北京:中国水利水电出版社,2005:373-399.Chen Z Y,Wang X G,Yang J,et al.Rock slope stability analy-sis:Principles,methods,procedures[M].Beijing:China WaterPower Press,2005:373-399.(in Chinese)
[9]陈祖煜.土力学经典问题的极限分析上、下限解[J].岩土工程学报,2002,24(1):1-11.Chen Z Y.Limit analysis for the classic problems of soil me-chanics[J].Chinese Journal of Geotechnical Engineering,2002,24(1):1-11.(in Chinese)
[10]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 S Y,Zheng Y R,Deng W D.Stability analysis on jointedrock slope by strength reduction FEM[J].Chinese Journal ofRock Mechanics and Engineering,2003,22(2):254-260.(inChinese)
[11]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345-1348.Liu J L,Luan M T,Zhao S F,et al.Discussion on criteria forevaluating stability of slope in elastoplastic FEM based onshear strength reduction technique[J].Rock and Soil Me-chanics,2005,26(8):1345-1348.(in Chinese)
[12]方建瑞,许志雄,庄晓莹,等.三维边坡稳定弹塑性有限元分析与评价[J].岩土力学,2008,29(10):2667-2672.Fang J R,Xu Z X,Zhuang X Y,et al.Appraisal and analysis ofthree-dimensional slope stability based on elastoplastic FEM[J].Rock and Soil Mechanics,2008,29(10):2667-2672.(inChinese)
[13]郑颖人,叶海林,黄瑞秋,等.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.Zheng Y R,Ye H L,Huang R Q,et al.Analysis and discus-sion of failure mechanism and fracture surface of slope underearthquake[J].Chinese Journal of Rock Mechanics and Engi-neering,2009,28(8):1714-1723.(in Chinese)
[14]Hoek E,Bray J.Rock slope engineering[M].London:Institu-te of Mineral and Metallurgy,1981:3-9.
[15]骆亚生,邢义川.黄土的抗拉强度[J].陕西水力发电,1998,14(4):6-10.Luo Y S,Xing Y C.The tensile strength of loess[J].ShaanxiHydropower,1998,14(4):6-10.(in Chinese)
[16]姚文波,刘文兆,侯甬坚.汶川大地震陇东黄土高原崩塌滑坡的调查分析[J].生态学报,2008,28(12):5917-5926.Yao W B,Liu W Z,Hou Y J.Investigation and analysis of col-lapses and landslide on the Loess Plateau of East Gansu Prov-ince after the 5.12 Wenchuan Earthquake[J].Acta EcologicaSinica,2008,28(12):5917-5926.(in Chinese)
[2]文宝萍.黄土地区典型滑坡预测预报及减灾对策研究[M].北京:地质出版社,1997.Wen B P.Research on the forecast and disaster reduction oftypical landslides in loess areas[M].Beijing:Geology Press,1997.(in Chinese)
[3]王兰明.黄土动力学[M].北京:地震出版社,2003.Wang L M.Loess dynamics[M].Beijing:Seismic Press,2003.(in Chinese)
[4]陈永明,石玉成.中国西北黄土地区地震滑坡基本特征[J].地震研究,2006,29(3):276-280.Chen Y M,Shi Y C.Basic characteristics of seismic landslidesin loess area of northwest China[J].Journal of SeismologicalResearch,2006,29(3):276-280.(in Chinese)
[5]袁丽侠.宁夏地震诱发黄土滑坡[M].宁夏银川:宁夏人民出版社,2005.Yuan L X.Loess landslides induced by Ningxia earthquake[M].Yinchuan,Ningxia:Ningxia People Press,2005.(in Chi-nese)
[6]曲永新,张永双.三趾马红土与西北黄土高原滑坡[J].工程地质学报,1999,7(3):257-265.Qu Y X,Zhang Y S.Hipparion laterite and landslide hazards onloess plateau of northwestern China[J].Journal of EngineeringGeology,1999,7(3):257-265.(in Chinese)
[7]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002:379-392.Cai M F,He M C,Liu D Y.Rock mechanics and engineering[M].Beijing:Science Press,2002:379-392.(in Chinese)
[8]陈祖煜,汪小刚,杨健,等.岩质边坡稳定分析:原理、方法、程序[M].北京:中国水利水电出版社,2005:373-399.Chen Z Y,Wang X G,Yang J,et al.Rock slope stability analy-sis:Principles,methods,procedures[M].Beijing:China WaterPower Press,2005:373-399.(in Chinese)
[9]陈祖煜.土力学经典问题的极限分析上、下限解[J].岩土工程学报,2002,24(1):1-11.Chen Z Y.Limit analysis for the classic problems of soil me-chanics[J].Chinese Journal of Geotechnical Engineering,2002,24(1):1-11.(in Chinese)
[10]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 S Y,Zheng Y R,Deng W D.Stability analysis on jointedrock slope by strength reduction FEM[J].Chinese Journal ofRock Mechanics and Engineering,2003,22(2):254-260.(inChinese)
[11]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345-1348.Liu J L,Luan M T,Zhao S F,et al.Discussion on criteria forevaluating stability of slope in elastoplastic FEM based onshear strength reduction technique[J].Rock and Soil Me-chanics,2005,26(8):1345-1348.(in Chinese)
[12]方建瑞,许志雄,庄晓莹,等.三维边坡稳定弹塑性有限元分析与评价[J].岩土力学,2008,29(10):2667-2672.Fang J R,Xu Z X,Zhuang X Y,et al.Appraisal and analysis ofthree-dimensional slope stability based on elastoplastic FEM[J].Rock and Soil Mechanics,2008,29(10):2667-2672.(inChinese)
[13]郑颖人,叶海林,黄瑞秋,等.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.Zheng Y R,Ye H L,Huang R Q,et al.Analysis and discus-sion of failure mechanism and fracture surface of slope underearthquake[J].Chinese Journal of Rock Mechanics and Engi-neering,2009,28(8):1714-1723.(in Chinese)
[14]Hoek E,Bray J.Rock slope engineering[M].London:Institu-te of Mineral and Metallurgy,1981:3-9.
[15]骆亚生,邢义川.黄土的抗拉强度[J].陕西水力发电,1998,14(4):6-10.Luo Y S,Xing Y C.The tensile strength of loess[J].ShaanxiHydropower,1998,14(4):6-10.(in Chinese)
[16]姚文波,刘文兆,侯甬坚.汶川大地震陇东黄土高原崩塌滑坡的调查分析[J].生态学报,2008,28(12):5917-5926.Yao W B,Liu W Z,Hou Y J.Investigation and analysis of col-lapses and landslide on the Loess Plateau of East Gansu Prov-ince after the 5.12 Wenchuan Earthquake[J].Acta EcologicaSinica,2008,28(12):5917-5926.(in Chinese)
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