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通过对成都黏土地区18处基坑的现场调查发现,由悬臂桩支护的基坑普遍存在着显著的变形破坏现象。以其中一个具有代表性的基坑工程为背景,在分析其现场监测数据的基础上,采用数值计算对基坑变形破坏的原因进行研究。研究结果表明:水是引起成都黏土地区基坑变形破坏的主要因素。建议在基坑施工过程中,查明基坑的涉水因素,加强坡体的防排水措施。同时对于该类基坑的设计,在折减土体力学参数基础上,还需进一步考虑土体遇水后所产生膨胀力的影响。
Based on the field investigation of 18 foundations in the clay area of Chengdu, it is found that there are widespread deformation and failure phenomena in the foundation pit supported by cantilever piles. Based on the analysis of the on-site monitoring data, one of the representative foundation pit projects is studied, and the causes of deformation and failure of the excavation are studied by numerical calculation. The results show that water is the main factor that causes deformation and failure of foundation pit in clay area of Chengdu. It is suggested that in the process of foundation pit construction, the factors of wading in foundation pit should be identified and the measures of drainage and drainage of slope body should be strengthened. At the same time, for the design of such kind of foundation pit, on the basis of reducing the mechanical parameters of soil, further consideration should be given to the influence of expansion force generated by the soil after water contact.