墙锚支护下某病房综合楼基坑变形的数值分析

Numerical Studying on Deformation of Foundation Pit of a Ward Building Protected by Wall Anchor

为研究数值方法在模拟深基坑支护结构变形中的应用,利用FLAC3D对某墙锚支护下的基坑开挖进行了模拟,分析了边开挖边支护工序下基坑北侧墙顶水平位移和紧邻的门诊楼沉降的变形情况,得出基坑周边土层由距离基坑的远近依次呈现较小和较大沉降的规律;坑底土体最大隆起产生在基坑中部,并以此为中心依次减小;连续墙顶水平位移随开挖不断增大,并存在两次位移急剧增长的情况,最终达到稳定;门诊楼监测点距离基坑越近,监测点的沉降越大.最后将模拟结果与监测数据对比,两者基本吻合.

In order to study the application of numerical methods in the simulation of deep foundation pit deformation,this paper carried out the simulation of the excavation of the foundation pit supported by the wall anchor by means of FLAC3D,analyzed the horizontal displacement of the top of the north wall in the excavation pit and the earth subsidence of the nearby clinic building under the process of excavation and came to the conclusion that the soil around the foundation pit showed successively the law of larger and smaller settlements according to the distance from the foundation pit;the bottom soil produced the greatest uplift in the central pit,with which as a center,it decreased in turn and the horizontal displacement of the top of the diaphragm wall,which reached to stability under the condition of the drastical growth of the two displaycements,increased with the excavation.The closer to the foundation pit the settlement of the monitoring point of the clinic building was,the bigger the settlement of the monitoring point was.At last,when the result of the simulation was compared with the monitoring datum,they basically coincided.