滑坡动力失稳定量分析
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摘要
采用FLAC3D软件进行滑坡动力时程数值分析,对滑带单元的瞬时应力进行分解,得到滑带单元上垂直滑带的正应力和平行滑动方向的剪应力,据此定义滑带点安全系数以及滑坡整体安全系数。通过滑带点安全系数的动态空间分布特征以及滑坡整体安全系数的动力时程演化特征,定量分析滑坡的动力失稳。青海玉树结古镇至巴塘机场公路2#滑坡实例分析结果表明:地震作用下滑坡的动力失稳机理为推动式,与自重作用时一致;但地震作用明显降低滑坡的稳定性,且以滑坡中前部最为明显,最大降幅约30%;计算结果与滑坡的宏观变形特征相吻合,滑体中前部西杭引水渠附近震后出现密集的裂缝带,正是由于地震作用导致该部位滑带稳定性快速衰减所致。
The dynamic time history of landslide was analyzed by the FLAC3 Dsoftware,and the instantaneous stress of sliding zone unit was decomposed to obtain the normal stress perpendicular to the sliding zone and the shear stress parallel to the sliding direction.According to this,the point safety factor of sliding zone and the whole safety factor of landslide were defined.Based on the change in the dynamic spatial distribution of point safety factor and the change in the dynamic time history of whole safety factor in the test,the dynamic instability of landslide was quantitatively analyzed.The analysis results of the 2#landslide of Jiegu Town to Batang Airport Highway in Qinghai Province showed that the dynamic instability mechanism of landslide was the type of pushing,which was consistent with dead-weight effect.However,the stability of the landslide was obviously decreased by earthquake,especially in the middle front part of landslide,with a maximum decrease of about 30%.The calculation result was consistent with the macroscopic deformation characteristics of landslide.After the earthquake,the dense fracture zone appeared in the vicinity of the Xihang diversion channel located in the middle front part of the sliding mass.It was precisely due to the earthquake action that the stability of the sliding zone in this area decayed rapidly.
The dynamic time history of landslide was analyzed by the FLAC3 Dsoftware,and the instantaneous stress of sliding zone unit was decomposed to obtain the normal stress perpendicular to the sliding zone and the shear stress parallel to the sliding direction.According to this,the point safety factor of sliding zone and the whole safety factor of landslide were defined.Based on the change in the dynamic spatial distribution of point safety factor and the change in the dynamic time history of whole safety factor in the test,the dynamic instability of landslide was quantitatively analyzed.The analysis results of the 2#landslide of Jiegu Town to Batang Airport Highway in Qinghai Province showed that the dynamic instability mechanism of landslide was the type of pushing,which was consistent with dead-weight effect.However,the stability of the landslide was obviously decreased by earthquake,especially in the middle front part of landslide,with a maximum decrease of about 30%.The calculation result was consistent with the macroscopic deformation characteristics of landslide.After the earthquake,the dense fracture zone appeared in the vicinity of the Xihang diversion channel located in the middle front part of the sliding mass.It was precisely due to the earthquake action that the stability of the sliding zone in this area decayed rapidly.
引文
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[14]杨涛,游湘,秦永涛.用点安全系数分析滑坡的空间滑动机理[J].西南交通大学学报,2010,45(5):794-799.(YANG Tao,YOU Xiang,QIN Yongtao.Application of Point Safety Factor to Study on Spatial Sliding Mechanism of Landslide[J].Journal of Southwest Jiaotong University,2010,45(5):794-799.in Chinese)
[15]杨涛,周德培,马惠民,等.滑坡稳定性分析的点安全系数法[J].岩土力学,2010,31(3):971-975.(YANG Tao,ZHOU Depei,MA Huimin,et al.Point Safety Factor Method for Stability Analysis of Landslide[J].Rock and Soil Mechanics,2010,31(3):971-975.in Chinese)
[16]徐邦栋.滑坡分析与防治[M].北京:中国铁道出版社,2001.
[17]杨涛,马惠民,代杰,等.滑坡稳定性分析点安全系数法的应用条件[J].西南交通大学学报,2011,46(6):966-972.(YANG Tao,MA Huimin,DAI Jie,et al.Application Condition of Point Safety Factor Method for Stability Analysis of Landslide[J].Journal of Southwest Jiaotong University,2011,46(6):966-972.in Chinese)
[18]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):2730-2733.(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):2730-2733.in Chinese)
[19]张友锋,袁海平.FLAC3D在地震边坡稳定性分析中的应用[J].江西理工大学学报,2008,29(5):23-26.(ZHANG Youfeng,YUAN Haiping.The Application of FLAC3Dto the Analysis of Slope Stability in Earthquake[J].Journal of Jiangxi University of Science and Technology,2008,29(5):23-26.in Chinese)
[2]邓东平,李亮.基于滑动面搜索新方法对地震作用下边坡稳定性拟静力分析[J].岩石力学与工程学报,2012,31(1):86-98.(DENG Dongping,LI Liang.Based on a New Method of Searching for Sliding Surface Pseudo-Static Stability Analysis of Slope under Earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(1):86-98.in Chinese)
[3]NEWMARK N M.Effects of Earthquakes on Dams and Embankments[J].Geotechnique,1965,15(2):139-160.
[4]RANDALL W Jibson,MATTHEW W Jibson.Java Programs for Using Newmark’s Method and Simplified Decoupled Analysis to Model Slope Performance during Earthquakes[M].Virginia Geological Survey,2003.
[5]张菊明,王思敬.层状边坡岩体滑动稳定的三维动力学分析[J].工程地质学报,1994,2(3):1-12.(ZHANG Juming,WANG Sijing.3-D Dynamic Analysis of Rock Sliding on the Layered Rock Slope[J].Journal of Engineering Geology,1994,2(3):1-12.in Chinese)
[6]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738-743.(LI Yushu,GAO Guangyun,LI Tianbin.Analysis of Earthquake Response and Stability Evaluation for Transverse Slope at Secund Tunnel Portal[J].Chinese Journal of Underground Space and Engineering,2006,2(5):738-743.in Chinese)
[7]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.(LIU Hanlong,FEI Kang,GAO Yufeng.Time History Analysis Method of Slope Seismic Stability[J].Rock and Soil Mechanics,2003,24(4):553-556.in Chinese)
[8]郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010(2):173-180.(ZHENG Yingren,YE Hailin,HUANG Runqiu,et al.Study on the Seismic Stability Analysis of a Slope[J].Journal of Earthquake Engineering and Engineering Vibration,2010(2):173-180.in Chinese)
[9]许家雄,曾开华,奚守仲,等.汶川地震岩质边坡崩塌机理分析[J].公路,2012(10):14-18.(XU Jiaxiong,ZENG Kaihua,XI Shouzhong,et al.Analysis of Collapsing Mechanism of Rock Slope in Wenchuan Earthquake[J].Highway,2012(10):14-18.in Chinese)
[10]言志信,张森,张学东,等.地震边坡失稳机理及稳定性分析[J].工程地质学报,2010,18(6):844-850.(YAN Zhixin,ZHANG Sen,ZHANG Xuedong,et al.Failure Mechanism and Stability Analysis of Slope under Earthquake[J].Journal of Engineering Geology,2010,18(6):844-850.in Chinese)
[11]刘君,孔宪京.卫生填埋场复合边坡地震稳定性和永久变形分析[J].岩土力学,2004,25(5):778-782.(LIU Jun,KONG Xianjing.Seismic Stability and Permanent Displacement Analysis of a Solid Waste Landfill Slope Containing Geomembrane[J].Rock and Soil Mechanics,2004,25(5):778-782.in Chinese)
[12]罗刚,胡卸文,张耀.平面滑动型岩质边坡地震动力响应[J].西南交通大学学报,2010,45(4):521-526.(LUO Gang,HU Xiewen,ZHANG Yao.Seismic Dynamic Responses of Plane Sliding Rock Slope[J].Journal of Southwest Jiaotong University,2010,45(4):521-526.in Chinese)
[13]周洪燕.边坡地震响应及动力稳定性分析[D].成都:西南交通大学,2013.(ZHOU Hongyan.Research on Seismic Response and Dynamical Stability of Slope[D].Chengdu:Southwest Jiaotong University,2013,in Chinese)
[14]杨涛,游湘,秦永涛.用点安全系数分析滑坡的空间滑动机理[J].西南交通大学学报,2010,45(5):794-799.(YANG Tao,YOU Xiang,QIN Yongtao.Application of Point Safety Factor to Study on Spatial Sliding Mechanism of Landslide[J].Journal of Southwest Jiaotong University,2010,45(5):794-799.in Chinese)
[15]杨涛,周德培,马惠民,等.滑坡稳定性分析的点安全系数法[J].岩土力学,2010,31(3):971-975.(YANG Tao,ZHOU Depei,MA Huimin,et al.Point Safety Factor Method for Stability Analysis of Landslide[J].Rock and Soil Mechanics,2010,31(3):971-975.in Chinese)
[16]徐邦栋.滑坡分析与防治[M].北京:中国铁道出版社,2001.
[17]杨涛,马惠民,代杰,等.滑坡稳定性分析点安全系数法的应用条件[J].西南交通大学学报,2011,46(6):966-972.(YANG Tao,MA Huimin,DAI Jie,et al.Application Condition of Point Safety Factor Method for Stability Analysis of Landslide[J].Journal of Southwest Jiaotong University,2011,46(6):966-972.in Chinese)
[18]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):2730-2733.(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):2730-2733.in Chinese)
[19]张友锋,袁海平.FLAC3D在地震边坡稳定性分析中的应用[J].江西理工大学学报,2008,29(5):23-26.(ZHANG Youfeng,YUAN Haiping.The Application of FLAC3Dto the Analysis of Slope Stability in Earthquake[J].Journal of Jiangxi University of Science and Technology,2008,29(5):23-26.in Chinese)
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