加筋水泥土桩锚支护基坑侧向位移设计要素模拟分析

摘要

针对尚水花园项目基坑存在长且厚淤泥质黏土土层等地质特点，为解决淤泥质土层和微承压含水层软基边坡支护问题，采用加筋水泥土桩锚支护技术对基坑进行支护。结合GTS NX有限元软件，通过改变加筋水泥土桩的设计要素，对基坑侧向位移进行数值模拟。模拟结果表明：改变水泥土桩嵌入深度、H型钢截面尺寸和嵌入深度等设计要素，对基坑侧向位移影响不大；改变斜向锚体与水平面夹角、斜向锚体根数等设计要素，对基坑侧向位移影响较明显。夹角越大，侧向位移越小；增加斜向锚体道数，可有效降低基坑变形。%Since Shangshuihuayuan project foundation pit has geological characteristic of long and thick muddy clay soil layer,etc.,reinforced cement-soil pile anchor bar supporting technology is adopted for supporting foundation pit in order to solve the support problem of muddy soil layer and micro-confined aquifer layer soft foundation slope.GTS NX finite element software is combined.Foundation pit lateral displacement undergoes numerical simulation through changing the design elements of reinforced cement-soil piles.The simulation results show that the change of cement-soil pile embedded depth, H-beam section size, embedded depth, and other design elements have low influence on foundation pit lateral displacement.The change of design factors such as inclined angle between anchor body and horizontal plane,oblique anchor quantity,etc.have more prominent influence on foundation pit lateral displacement.The larger the inclined angle is,the smaller the lateral displacement is.The oblique anchor quantity can be increased for lowering foundation pit deformation effectively.