考虑地震力的刚体极限平衡法及其工程应用
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摘要
在斜坡稳定性分析中,地震力偏角对斜坡稳定性的影响极大,但水平方向并不是最危险地震力作用方向,如何合理简单地求取地震力,并参与条分计算,是一个值得研究的问题。针对规范中拟静力法的地震力作用方向为水平方向,提出考虑地震力最危险方向的计算方法。以不平衡推力法为例,对考虑地震力的刚体极限平衡法进行改进,并应用于三峡库区兴山县高阳镇核桃树沟滑坡稳定性评价。结果表明:桃树沟滑坡最危险的地震力作用方向为指向坡外与水平面夹角为7.8°,最安全的地震力方向为187.8°;桃树沟滑坡在库水位175 m以及叠加6度地震时,滑坡的稳定性系数在0.9以下,滑坡处于失稳状态,需要对该滑坡进行治理。
The influence of deflection angles of seismic force on slope stability is great in analysis of slope stability.However,the horizontal direction of seismic force is not the critical direction of seismic force.How to solve seismic force and to calculate the slope stability is worthy to be studied.Aiming at that the pseudo-static method in present standard takes the horizontal direction as the action direction of seismic force,the calculation method considering the critical direction of seismic force is put forward.Taking the imbalance thrust force method as an example,the rigid limit equilibrium method considering seismic force is improved and applied to stability evaluation of Taoshugou landslide,which is located in Gaoyang town,Xingshan County in the Three Georges reservoir area.The result shows that the included angle between the critical direction of seismic force and the horizontal plane is 7.8°and directs to the out of the slope.The safest direction is 187.8.° The stability factor of Taoshugou landslide is less than 0.9 under 175 m reservoir water level and earthquake with magnitude 6.Thus Taoshugou landslide is unstable and needed to be urgently prevented.
The influence of deflection angles of seismic force on slope stability is great in analysis of slope stability.However,the horizontal direction of seismic force is not the critical direction of seismic force.How to solve seismic force and to calculate the slope stability is worthy to be studied.Aiming at that the pseudo-static method in present standard takes the horizontal direction as the action direction of seismic force,the calculation method considering the critical direction of seismic force is put forward.Taking the imbalance thrust force method as an example,the rigid limit equilibrium method considering seismic force is improved and applied to stability evaluation of Taoshugou landslide,which is located in Gaoyang town,Xingshan County in the Three Georges reservoir area.The result shows that the included angle between the critical direction of seismic force and the horizontal plane is 7.8°and directs to the out of the slope.The safest direction is 187.8.° The stability factor of Taoshugou landslide is less than 0.9 under 175 m reservoir water level and earthquake with magnitude 6.Thus Taoshugou landslide is unstable and needed to be urgently prevented.
引文
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[15]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2 792–2 797.(QI Shengwen,WU Faquan,LIU Chunling,et al.Engineering geology analysis of stability of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2 792–2 797.(in Chinese))
[16]刘惠军,孙冠平,刘小伟.天池滑坡坝在地震作用下稳定性分析[J].岩石力学与工程学报,2003,22(增2):2 809–2 812.(LIU Huijun,SUN Guanping,LIU Xiaowei.Stability analysis of Tianchi landslide-dam under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.2):2 809–2 812.(in Chinese)).
[17]李德武,梁波,韩文峰.桥台岸坡滑移地震稳定性分析[J].岩石力学与工程学报,2003,22(增2):2 813–2 818.(LI Dewu,LIANG Bo,HAN Wenfeng.Stability analysis of abutment slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.2):2 813–2 818.(in Chinese))
[2]黄理兴,陈奕柏.我国岩石动力学研究状况与发展[J].岩石力学与工程学报,2003,22(11):1 881–1 886.(HUANG Lixing,CHEN Yibai.Rock dynamics in China:past,present and future[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1 881–1 886.(in Chinese)).
[3]李海波,蒋会军,赵坚,等.动荷载作用下岩体工程安全的几个问题[J].岩石力学与工程学报,2003,22(11):1 887–1 891.(LI HaiboJ,IANG Huijun,ZHAO Jian,et al.Some problems about safety analysis of rock engineering under dynamic load[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1 887–1 891.(in Chinese))
[4]刘忠玉,魏建东.饱和黄土边坡的动力稳定性分析[J].岩土力学,2005,26(2):198–202.(LIU Zhongyu,WEI Jiandong.Analysis of dynamic stability of saturated loess slopes[J].Rock and Soil Mechanics,2005,26(2):198–202.(in Chinese))
[5]唐洪祥,邵龙潭.地震动力作用下有限元土石坝边坡稳定性分析[J].岩石力学与工程学报,2004,23(8):1 318–1 324.(TANG Hongxiang,SHAO Longtan.Finite element analysis of slope stability of earth-rock dam under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):1 318–1 324.(in Chinese)).
[6]陈蜀俊,党晓英,曾心传,等.奉节长江大桥北岸边坡在地震荷载作用下的稳定性分析[J].岩石力学与工程学报,2004,23(4):657–662.(CHEN Shujun,DANG Xiaoying,ZENG Xinchuan,et al.Seismic stability analysis of slope at north bank of Fengjie Yangtze river bridge[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):657–662.(in Chinese))
[7]王环玲,徐卫亚.高烈度区水电工程岩石高边坡三维地震动力响应分析[J].岩石力学与工程学报,2005,24(增2):5 890–5 895.(WANG Huanling,XU Weiya.3D dynamical response analysis of high rock slope related to hydropower project in highly intensive seismic region[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5 890–5 895.(in Chinese))
[8]于翔,钱七虎,赵跃堂,等.地铁工程结构破坏的竖向地震力影响分析[J].解放军理工大学学报(自然科学版),2001,2(3):75–77.(YU Xiang,QIAN Qihu,ZHAO Yuetang,et al.Analysis of vertical earthquake influence on damage to subway structures[J].Journal of PLA University of Science and Technology(Natural Science),2001,2(3):75–77.(in Chinese))
[9]冯夏庭,李邵军,张友良,等.滑坡的综合集成智能分析与优化设计方法研究[J].岩石力学与工程学报,2003,22(10):1 592–1 596.(FENG Xiating,LI Shaojun,ZHANG Youliang,et al.Study on methodology of comprehensive intelligent analysis and optimum design for landslide[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1 592–1 596.(in Chinese))
[10]陈昌富,杨宇,龚晓南.基于遗传算法地震荷载作用下边坡稳定性分析水平条分法[J].岩石力学与工程学报,2003,22(11):1 919–1 923.(CHEN Changfu,YANG Yu,GONG Xiaonan.Horizontal slice method of slope stability analysis under seismic load based on genetic algorithm[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1 919–1 923.(in Chinese))
[11]吕擎峰,殷宗泽,王叔华,等.拟静力法边坡稳定分析的改进[J].岩土力学,2005,26(增):35–38.(LU Qingfeng,YIN Zongze,WANG Shuhua,et al.Improvement of pseudo-static method for slope stability analysis[J].Rock and Soil Mechanics,2005,26(Supp.):35–38.(in Chinese))
[12]陈卫忠,朱维申,邱祥波,等.小湾水电站拱坝坝肩岩体加固方案分析研究[J].岩石力学与工程学报,2002,21(3):374–378.(CHEN Weizhong,ZHU Weishen,QIU Xiangbo,et al.Research on reinforcement scheme for Xiaowan abutment[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(3):374–378.(in Chinese)).
[13]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2 730–2 733.(LIU Chunling,QI Shengwen,TONG Liqiang,et al.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2 730–2 733.(in Chinese)).
[14]胡修文,唐辉明,刘佑荣.三峡库区赵树岭滑坡稳定性物理模拟试验研究[J].岩石力学与工程学报,2005,24(12):2 089–2 095.(HU Xiuwen,TANG Huiming,LIU Yourong.Physical model studies on stability of Zhaoshuling landslide in area of the Three Gorges Reservoir[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(12):2 089–2 095.(in Chinese))
[15]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2 792–2 797.(QI Shengwen,WU Faquan,LIU Chunling,et al.Engineering geology analysis of stability of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2 792–2 797.(in Chinese))
[16]刘惠军,孙冠平,刘小伟.天池滑坡坝在地震作用下稳定性分析[J].岩石力学与工程学报,2003,22(增2):2 809–2 812.(LIU Huijun,SUN Guanping,LIU Xiaowei.Stability analysis of Tianchi landslide-dam under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.2):2 809–2 812.(in Chinese)).
[17]李德武,梁波,韩文峰.桥台岸坡滑移地震稳定性分析[J].岩石力学与工程学报,2003,22(增2):2 813–2 818.(LI Dewu,LIANG Bo,HAN Wenfeng.Stability analysis of abutment slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.2):2 813–2 818.(in Chinese))
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