【摘要】 通过对快速拉格朗日法(FLAC3D法)动力分析原理进行研究,选取合理的岩质边坡动力本构模型、动力边界以及阻尼模型,建立四川震区理县至小金公路工程中豹子嘴岩质高边坡三维数值模型。在对四川"5·12"汶川8.0级大地震主震台站即理县木卡站实测地震波校正的基础上,对强地震作用下岩质高边坡的动力特性进行数值模拟分析。研究结果表明:边坡顶部位移主要以沉降模式为主,坡腰附近主要以水平位移为主,而在水平地震荷载作用下边坡呈现出明显的位移分层现象,且边坡破坏以圆弧形滑动模式为主;在强震作用下,边坡顶部较边坡底部的位移、速度以及加速度等动力响应均有竖向放大现象,且加速度放大效应较小,而速度和位移的放大效应较大,这可为震区岩质高边坡的设计及边坡加固技术的优化提供理论依据。更多还原

【Abstract】 Based on the research of fast Lagrangian analysis of continua(FLAC3D),three-dimensional numerical model for high rock slope of Lixian—Xiaojin highway in Sichuan Province was established by adopting reasonable dynamic constitutive model,dynamic boundary and damping model.Through correcting the measured seismic wave originated from seismic station-Lixian Muka station in "5·12" Wenchuan earthquake with earthquake magnitude of 8.0 grade,the dynamic characteristics for high rock slope was studied by numerical simulation analysis.The results show that the slope roof mainly is in the form of "settlement" and slope waist is mainly in the form "horizontal displacement".Rock slope shows apparent displacement delamination and arc-shaped sliding mode for damage under horizontal earthquake action.Moreover,the dynamic response of displacement,velocity and acceleration have vertical amplification effect through contrasting between slope roof and slope foot.The amplification effect of acceleration is smaller than that of velocity and displacement.The results can provide theoretical basis for high rock slope design and reinforcement optimization.更多还原