顺层岩质边坡动力响应及地基水平抗力研究

Study on Dynamic Response and Horizontal Resistance of Bedding Rock Slope

建立了坡顶存在高层建筑的顺层岩质边坡数值模型,以研究边坡地基对建筑地下室侧向约束作用。分析了岩质边坡地基在水平地震工况下的加速度响应规律、边坡变形机制以及地下室侧壁受力特征等。通过控制变量法分别分析地下室临坡距、边坡坡高、坡角以及结构面强度参数等因素对地下室约束作用的影响,并采用归一法对岩石边坡地基水平抗力系数进行敏感性分析。结果表明:在确保岩质边坡不产生沿外倾结构面发生滑动破坏的前提下,结构面强度参数对水平抗力系数影响较小,岩质边坡地基水平抗力系数主要影响因素的程度排序为:坡高>临坡距>坡角。

A numerical model of a rock slope with an out-dip structural plane,which has a high-rise building at the top of the slope,is established to study the lateral constraint effect of the slope foundation on the basement of the building.Acceleration response law,slope deformation mechanism and stress characteristics on basement side wall of the rock slope foundation under horizontal seismic condition are analyzed.The influences of basement slope distance,side slope height,slope angle and strength parameters of the structural plane on the basement restraint effect was studied by control variate method.The sensitivity analysis of the horizontal resistance coefficient of rock slope foundation is carried out by using the normalization method.The results show that:The strength parameters of structural plane have little influence on the horizontal resistance coefficient on the premise that the slope does not slide along the structural plane,and the order of the main influencing factors of the horizontal resistance coefficient of the rock slope foundation is shown as follows:slope height>slope distance>slope angle.