基坑周边通常存在着建筑材料、车辆和其他荷载的情况，影响基坑安全。以扬州某项目基坑围护设计为例，基于理正软件进行分析，研究坑外均布荷载对基坑支护结构整体稳定性、坑外地表沉降、以及水平位移的影响。研究结果表明：在三倍基坑深度范围内，坑外均布荷载与基坑支护结构的地表沉降、水平位移呈明显正相关。外荷载低于20 KPa时，基坑整体满足稳定性验算。当外荷载高于30 KPa时，基坑整体不满足稳定性验算，不利于基坑安全稳定。
There are usually construction materials, vehicles and other loads around the foundation pit, which affects the safety of the foundation pit. Taking the foundation pit design of a project in Yangzhou as an example, based on the analysis of the rational software, the effects of the external load on the horizontal displacement of the foundation pit support structure, the settlement outside the pit and the overall stability are studied. The results show that the load size is positively correlated with the horizontal displacement and surface settlement of the foundation pit support structure within the depth of 3 times foundation pit. When the external load is lower than 20 KPa, the foundation pit as a whole satisfies the stability check. When the external load is higher than 30 KPa, the overall foundation pit does not satisfy the stability check, which is not conducive to the safety and stability of the foundation pit.
