长春市某基坑双排桩支护结构的变形研究

Study on deformation of double row pile supporting structure

双排桩支护结构具有施工工期短,施工占地少等优点。本文以长春地区采用双排桩支护结构的某基坑工程为研究对象,借助有限差分软件FLAC 3D进行数值模拟,分析了围护桩水平位移受双排桩排距、桩径变化和后排桩桩长影响的规律。研究结果如下:前后排桩的桩身水平位移都随着排距的增大而减小,并且后排桩的减小幅度更为明显;随着桩径的增大,桩顶的最大水平位移在不断地减小,但减小的速率也逐渐缓慢;随着后排桩的桩长增加,前排桩和后排桩的桩身水平位移都在不断减小。

Double row pile supporting structure has the advantages of short construction period,less construction area and so on.In this paper,the excavation process of a foundation pit with double-row pile supporting structure in Changchun area is numerically simulated by using the finite difference software FLAC 3D,and the rule of the horizontal displacement of the envelope pile affected by the change of double-row pile spacing and pile diameter is analyzed.The results are as follows:The horizontal displacement of front and back piles decreases with the increase of row distance,and the decrease of back piles is more obvious.The maximum horizontal displacement of pile tip decreases with the increase of pile diameter,but the decreasing rate is also slow.With the increase of the pile body of the rear pile,the horizontal displacement of the pile body of the front pile and the rear pile is constantly decreasing.