沿海地区管廊建设基坑变形规律探讨

滨海软土相对于其他软土在工程特性上具有明显差异,以沿海某管廊建设所采用的两种不同基坑支护形式为例,探讨不同支护形式基坑的变形规律。结果表明,两种不同的支护形式都受基坑两侧动荷载和静荷载的影响较大,两侧荷载不均时易产生向一侧的偏移,灌注桩对基坑变形的控制明显优于钢板桩;坑底地基土加固和及时施工垫层及底板都可以有效的控制基坑变形,防止出现基坑失稳现象。

Discussion on the Deformation Law of Pipe Gallery Foundation Pit Construction in Coastal Areas

There are significant differences in engineering properties between seashore soft soil and other soft soils.Taking two different forms of foundation pit support as examples,discussion about the deformation law during the construction of the pipe gallery.The results showed that:the dynamic and static loads on both sides of the foundation pit have great influence on the two different supporting forms,and when the load on both sides is uneven,it is prone to shift to one side.Cast-in-place pile is better than steel sheet pile in controlling the deformation of foundation pit;Foundation soil reinforcement and timely construction of cushion and floor can effectively control the deformation of foundation pit and prevent the instability of foundation pit.