利用FLAC~(3D)预测某滑坡体地震荷载作用下的稳定性
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摘要
以澜沧江边某滑坡工程实例为背景,选用拟静力法对地震荷载进行模拟。利用AN-SYS软件建立数值模型,并导入FLAC3D软件进行计算,预测滑坡稳定性。对比结果表明:天然工况条件下,滑坡体塑性区零星分布,剪应力集中带仅位于滑坡体表面,位移场分布合理;加载地震荷载后,滑坡体塑性区上下贯通,滑动面明显,剪应力集中带深入滑坡体内部,形成完整的潜在滑动面,而且位移大幅度增加;两种工况条件下滑坡体的破坏形式均以水平滑动为主,地震工况条件下的滑坡体会出现大面积失稳。该研究为抗震方案设计提供了有益参考。
This paper building on a landslide associated with a reservoir construction on Lancang River discusses the simulation of seismic load by selecting pseudo-static method,the development of numerical model using ANSYS software,the introduction of FLAC3D software for calculation,and the prediction of the landslide stability.The comparison shows that,under the natural condition,there occur the sporadic distribution of the plastic zones of the slope,the concentration of the shear stress only on the surface of the landslide,and the rational displacement of field;but under seismic load,there arise the complete connection of the plastic zones of the slope,the obvious slip plane,and the extension of the shear stress concentration area deep into the interior body of the slope,resulting in a complete potential sliding surface,marked by a significant increase in the displacement;the failure mode of the landslides under the two conditions is dominated by the horizontal slip while landslide due to the seismic condition is accompanied by large areas of instability.The study serves as a references for the anti-seismic designs.
This paper building on a landslide associated with a reservoir construction on Lancang River discusses the simulation of seismic load by selecting pseudo-static method,the development of numerical model using ANSYS software,the introduction of FLAC3D software for calculation,and the prediction of the landslide stability.The comparison shows that,under the natural condition,there occur the sporadic distribution of the plastic zones of the slope,the concentration of the shear stress only on the surface of the landslide,and the rational displacement of field;but under seismic load,there arise the complete connection of the plastic zones of the slope,the obvious slip plane,and the extension of the shear stress concentration area deep into the interior body of the slope,resulting in a complete potential sliding surface,marked by a significant increase in the displacement;the failure mode of the landslides under the two conditions is dominated by the horizontal slip while landslide due to the seismic condition is accompanied by large areas of instability.The study serves as a references for the anti-seismic designs.
引文
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[2]叶海林,黄润秋,郑颖芝,等.地震作用下边坡稳定性安全评价的研究[J].地下空间与工程学报,2009,5(6):1248-1252.
[3]李亮,褚雪松,庞峰,等.地震边坡稳定性分析的拟静力方法适用性探讨[J].世界地震工程,2012,28(2):57-63.
[4]包世华.结构动力学[M].武汉:武汉理工大学出版社,2004.
[5]宫经伟,严新军,夏新利,等.拟静力法在溢洪道闸室抗震稳定计算中的应用[J].人民黄河,2010,32(1):107-108.
[6]邹栋,郑宏.快速拉格朗日法及其在边坡稳定性分析中的应用[J].矿业研究与开发,2005,25(5):84-87.
[7]黄润秋,许强.显式拉格朗日差分分析在岩石边坡工程中的应用[J].岩石力学与工程学报,1995,14(4):346-354.
[8]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
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