地震载荷下斜坡稳定性数值模拟分析
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摘要
地震载荷是影响复杂结构斜坡塌滑的一个重要因素。本文以汶川震区一边坡为实例,利用有限差分法FLAC-3D对地震动力下斜坡进行了数值模拟。并且在用FLAC-3D进行斜坡动力分析时探讨了边界条件设置、动力时程的合成以及输入和转化。从位移场与速度场进行了详细的动力分析,获得该斜坡地震载荷下位移场、速度场的变化规律,指出山体斜坡在非连续介质状态下软弱面区域位移和速度最大,为后续进行复杂的山体破坏力学研究提供理论依据。
The seismic load is an important factor in the collapse about the complex structure of the slippery slope.Based on an instance of Wenchuan Earthquake Area Slope,this paper uses the finite difference method FLAC-3D to simulate the effects of the slope under seismic load.In the slope with the FLAC-3D dynamic analysis,the problems about boundary conditions,and the synthesis,input,conversion of the dynamic time history are discussed.Through in-depth dynamical analysis of displacement and velocity,access to the variation of the displacement field and the velocity field under seismic load,the paper shows the displacement and velocity of the mountain slopes in the weak non-continuous medium surface area are the largest,and provides a theoretical basis for the subsequent destruction of the complex mechanics of the mountain.
The seismic load is an important factor in the collapse about the complex structure of the slippery slope.Based on an instance of Wenchuan Earthquake Area Slope,this paper uses the finite difference method FLAC-3D to simulate the effects of the slope under seismic load.In the slope with the FLAC-3D dynamic analysis,the problems about boundary conditions,and the synthesis,input,conversion of the dynamic time history are discussed.Through in-depth dynamical analysis of displacement and velocity,access to the variation of the displacement field and the velocity field under seismic load,the paper shows the displacement and velocity of the mountain slopes in the weak non-continuous medium surface area are the largest,and provides a theoretical basis for the subsequent destruction of the complex mechanics of the mountain.
引文
[1]王秀英.汶川Ms8.0级地震诱发崩塌滑坡特点分析[J].国际地震动态,2008(11):64.WANG Xiuying.Analysis of landslides'characteristicsinduced by Wenchuan Ms 8.0 earthquake[J].RecentDevelopments in World Seismology,2008(11):64.图15地震作用下斜坡竖直方向速度Fig.15 Vertical velocity ofrock slope in seismic state
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[3]赵宝云,刘保县,万贻平.爆破震动对某边坡稳定性影响的数值模拟[J].工程地质学报,2008(1):61-64.ZHAO Baoyun,LIU Baoxian,WAN Yiping.Numericalsimulation of blasting vibration on slope stability[J].Journal of Engineering Geology,2008(1):61-64.
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[6]陈育民,徐鼎平.FLAC/FLAC-3D基础与工程实例[M].北京:中国水利水电出版社,2009.CHEN Yumin,XU Dingping.FLAC/FLAC-3DFoundation and engineering example[M].Beijing:ChinaWater Power Press,2009.Numerical analysis on slope stability under seismic loadWANG Lai-gui,WANG Yan-de,LIU He,LI Lei
[2]尹紫红.地震作用下的滑坡稳定性分析[D].成都:西南交通大学硕士学位论文,2006.YIN Zihong.Dynamic and stability of landslide underearthquake loading[M.S.Thesis][D].Chengdu:SouthwestJiaotong University,2006.
[3]赵宝云,刘保县,万贻平.爆破震动对某边坡稳定性影响的数值模拟[J].工程地质学报,2008(1):61-64.ZHAO Baoyun,LIU Baoxian,WAN Yiping.Numericalsimulation of blasting vibration on slope stability[J].Journal of Engineering Geology,2008(1):61-64.
[4]言志信,张学东,张森,等.地震作用下边坡的共振响应研究[J].工程抗震与加固改造,2011,33(1):9-14.YAN Zhixin,ZHANG Xuedong,ZHANG Sen,et al.Study on seismic resonance effect of slope[J].EarthquakeResistant Engineering and Retrofitting,2011,33(1):9-14.
[5]靳晓光,李晓红,刘新荣,等.某含软弱夹层顺层岩岸坡应力位移特征数值模拟[J].重庆大学学报,2004,27(9):129-132.JIN Xiaoguang,LI Xiaohong,LIU Xinrong,et al.Numerical simulation of stress and displacement on asandwich with soft bedding rock slope[J].Journal ofChongqing University,2004,27(9):129-132.
[6]陈育民,徐鼎平.FLAC/FLAC-3D基础与工程实例[M].北京:中国水利水电出版社,2009.CHEN Yumin,XU Dingping.FLAC/FLAC-3DFoundation and engineering example[M].Beijing:ChinaWater Power Press,2009.Numerical analysis on slope stability under seismic loadWANG Lai-gui,WANG Yan-de,LIU He,LI Lei
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