易滑地层多级建筑边坡治理工程分析

Analysis of Multistage Building Slope Treatment Project in Slippery Stratum

项目地处长江一级斜坡,属于易滑地层,附近曾发生过滑坡、变形体不良地质现象,按建筑方案切坡以后分台地形成3级较高的人工边坡,高层建筑位于各阶边坡平台,距离坡顶较近,建筑修建后在地震、风荷载、竖向荷载作用下会有部分水平力通过斜坡岩土体传递到支挡结构,造成作用在支挡结构上的剩余下滑力增大。通过理论公式和数值模拟相结合的方法对斜坡整体稳定性及人工边坡局部稳定性进行了验算,肯定了支挡方案的合理性,分析了建筑水平荷载对边坡支挡结构内力的影响趋势,提出支挡结构设计应适当考虑建筑传递水平力的不利影响,建议采取加强建筑边桩、地梁刚度和桩顶增设抗拉锚杆等措施增强建筑自身抵抗部分水平力的能力。

The project is located in the first level slop of Yangtze River and belongs to the slippery stratum.There had been adverse geologic phenomena like landslide and deformable body near it.After cutting slopes according to the construction scheme,the tableland is divided into three relatively high artificial slopes,and the high-rise buildings are located in each plain stage of all stages of side slopes and near to the slope top.After the construction of buildings is finished,under the influence of earthquakes,wind loads and vertical loads,there will be part of the horizontal force transmitted to the retaining structures through rock and earth mass of slopes,resulting in a increase of the surplus sliding force on retaining structures.Through combing theoretical formulas and numerical simulation method,this paper checks the overall stability of the slope and the local stability of artificial side slope,confirms the rationality of retaining scheme,analyzes the trend of architecture horizontal load＇s influence on the internal force of side slope retaining structure,proposes that the retaining structures should be designed to consider the adverse effects of building transmitting horizontal force and recommends to take measures such as strengthening the construction side piles,strengthening the rigidity of ground beams and additional tensile anchor on pile block to enhance the capacity of building itself to resist part of horizontal force.