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中文摘要：
以西安地铁小寨站深基坑支护工程为例,对其所在区域的湿陷性黄土地质条件、周边环境进行了具体的分析,采用旋喷桩、钻孔灌注桩和钢支撑等支护方案进行基坑支护,充分发挥各自的优点.支护方案实施后,在现场监测基坑地表水平位移和地表沉降,基坑稳定后得到基坑地表水平位移最大值仅为6.4mm,地表沉降也没有超过设计值.实测结果表明基坑支护方案设计合理,基坑边坡变形得到了有效控制,各支护单元的受力性能发挥正常,确保了施工安全,取得了良好的经济效益和社会效益.
英文摘要：
Xiaozhai Station of Xian Subway situates in Loess Area, the geologic condition and surrounding environment of a deep foundation pit are very complex. Based on the characteristic of deep foundation pit for subway, high pressure chemical churning pile, cast-in-place concrete pile, and steel-bracing were designed for bracing structure. During construction of deep foundation pit, the horizontal displacement and settlement of ground surface were monitored, the maximum value of horizontal displacement was only 6.4mm, the settlement of ground surface was smaller than designed value, and the mechanical properties of each support element are all in normal working consequence. The results show that the design of deep foundation pit is reasonable and the displacement of ground surface is controlled effectively, meanwhile, the construction safety and economic value are attained.
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