基于FLAC~(3D)的滑坡地震动力响应分析
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摘要
以FLAC3D数值模拟计算为主要研究手段,结合某工程滑坡实例,从动力角度对地震作用下滑坡体稳定性和动力响应,以及设置抗滑桩后的防护效果进行了研究。结果表明:在地震作用下,滑坡(无抗滑桩)产生的最大总位移、最大水平位移均位于滑坡体的中后部;滑坡(无抗滑桩)水平位移在地震作用结束后,仍呈发散趋势,滑坡体可能处于不稳定状态,后续变形将继续发展;设置抗滑桩后,滑坡产生的最大水平位移、最大总位移相比设桩前滑坡体位移量明显减小,设桩后滑坡体内剪应变集中区域明显减小;在抗滑桩加固后,滑坡体的水平位移时程曲线呈现收敛趋势,滑坡体趋于稳定。
Based on a landslide sample,the landslide stability,dynamic response and the protection effectiveness' of anti-slide pile is studied by FLAC3D numerical simulation.The results show that under the action of earthquake,landslide(no anti slide pile) produced both of the maximum total displacement and the maximum horizontal displacement locating in the central-rear part of sliding body.The horizontal displacement under earthquake action of landslide(no anti-slide pile) after the end still showed divergent trend,sliding body may be in an unstable state,subsequent deformation will continue to development.After setting anti-slide pile,under the action of earthquake occurring,the maximum horizontal displacement and maximum total displacement of landslide displacement and decreased obviously,the pile in the landslide shear strain concentration area is obviously reduced.After setting the anti-slide pile,landslide displacement time-history curve shows convergence trend,the sliding body tends to be stable.
Based on a landslide sample,the landslide stability,dynamic response and the protection effectiveness' of anti-slide pile is studied by FLAC3D numerical simulation.The results show that under the action of earthquake,landslide(no anti slide pile) produced both of the maximum total displacement and the maximum horizontal displacement locating in the central-rear part of sliding body.The horizontal displacement under earthquake action of landslide(no anti-slide pile) after the end still showed divergent trend,sliding body may be in an unstable state,subsequent deformation will continue to development.After setting anti-slide pile,under the action of earthquake occurring,the maximum horizontal displacement and maximum total displacement of landslide displacement and decreased obviously,the pile in the landslide shear strain concentration area is obviously reduced.After setting the anti-slide pile,landslide displacement time-history curve shows convergence trend,the sliding body tends to be stable.
引文
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[5]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,2010,30(2):173-180.
[6]李磊,任光明,曹文广,等.边坡地震响应的动力有限元分析[J].长江科学院院报,2010,27(5):53-56.
[2]铁道部第一勘测设计院.路基[M].北京:中国铁道出版社,1995.
[3]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2003.
[4]郑颖人,赵尚毅.有限元强度折减法在土坡与岩坡中的应用[J].岩石力学与工程学报,2004,23(19):3381-3388.
[5]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,2010,30(2):173-180.
[6]李磊,任光明,曹文广,等.边坡地震响应的动力有限元分析[J].长江科学院院报,2010,27(5):53-56.
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