高挡墙对临近桩基的影响与控制措施分析

Analysis on Influence of High Retaining Wall on Adjacent Pile Foundation and Control Measures

利用有限元分析软件Midas GTS-NX,针对于临近桩基的非对称填方工程中,通过对不采取控制措施、填土反压3m、填土反压4.5m及填土反压4.5m和注浆加固的4种情况的模拟,对模拟结果中桩身水平位移的沉降分析,得出以下结果:桩周土体一般时,非对称填方将导致桩身水平侧移;桩身侧移方向为先向非对称荷载方向,然后随着荷载增加,侧移方向变为远离非对称荷载方向;非对称填土高度小于8m时,采用一定高度的填土反压,对控制临近桩基的侧向位移有一定效果;非对称填土大于8m且具有较大施工荷载时,采用一定高度反压并结合水泥注浆,对控制临近桩基的侧向位移有更可靠的控制效果。

In this paper,the finite element analysis software Midas GTS-NX is used to simulate 4 kinds of situations without control measures,backpressure of filling 3m,backpressure of filling 4.5m,backpressure of filling 4.5m and grouting reinforcement.After analyzing the settlement of the horizontal displacement of the pile body in the simulation results,the following results are obtained:when the soil around the pile is normal,the asymmetric filling will cause the horizontal lateral displacement of the pile body.The direction of lateral displacement of pile body is asymmetric load at first,and then becomes far away from asymmetric load as load increases.When the height of asymmetric filling is less than 8m,the backpressure of filling with certain height can control the lateral displacement of adjacent pile foundation to a certain extent.When the asymmetric filling is more than 8m and has large construction load,a certain height of back pressure combined with cement grouting can provide more reliable control effect on lateral displacement of adjacent pile foundation.