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1.工程概况 某广场基坑深7.2m,支护结构采用拉森2＃钢板桩加H300mm×300mm型钢斜撑方案,挡水挡土效果良好。由于场外原有污水管的长期外漏,土体遭水浸润后,力学性能变差,使C区转角部分支护结构失稳,钢板桩向基坑内侧倾斜,如图1所示。为保正后续施工的安全,需要尽快处理。
1. Project Overview Deep foundation pit of a square 7.2m, Larsen 2 # steel sheet piles supporting structure with H300mm × 300mm steel bracing program, retaining the retaining effect of water well. Due to the long-term leakage from the existing sewer pipes outside the field, the mechanical properties become worse after the soils are infiltrated with water. As a result, some of the support structures in the corner of Zone C are not stable, and the steel sheet piles are inclined to the inside of the foundation pit as shown in FIG. 1. To ensure the safety of subsequent construction, it needs to be dealt with promptly.