某深基坑工程边坡变形失稳致因及处理对策

针对某深基坑工程在施工过程中，出现支护结构和邻近建筑物变形沉降增大、边坡有失稳滑移的危险状况，采用场地水文地质特性调查、边坡支护方案模拟计算与施工监测数据分析相结合的研究方法，确定场地中对施工扰动敏感性强的原状粉土和粉细砂层的沉降是导致基坑边坡失稳的主因，采用土层锚拉加固方案取代对地层扰动较大的注浆排险方案，确保了基坑安全开挖和边坡的最终稳定。

Disposal Measures and Instability Causation of the Slope Deformation of a Deep Foundation Pit Engineering

With the dangerous situation of slope instability sliding and support deformation as well as the building subside increasing in the process o{ a deep foundation pit excavation, the multi-analysis and research ways which are composed of the field hydrogeology character surveying and support structure simulation with construction monitoring data analysis are used in this paper. The main causes which result in slope instability sliding are found the original silt and fine sand layer sedimentation which are strongly sensibility for construction disturbance. The treatment measures using the soil anchorage replaced of the concrete injecting are proposed and successfully applied on the field, which ensure for the deep foundation pit excavating safety and the slope final stabilization.