青岛地区土岩组合地层基坑工程支护设计及变形分析

摘要

在总结岩石地区基坑工程典型支护方式的基础上，介绍了青岛地区土岩组合的一个典型超深基坑工程案例。鉴于特殊的地层，本工程采用吊脚桩＋锚索支护体系，局部放坡结合钢管桩预支护。通过有限元数值分析结果与现场实测数据对比表明：在上覆土层较薄的岩石地区，围护结构的变形主要集中在土层部分。采用上述支护体系可以有效控制基坑及周围环境变形，同时大幅降低工程造价。%The paper introduces an example of very deep pit in rock combined with soil layers by summarizing typi-cal pits in Qingdao.Based on special geological conditions,during the excavation construction process,many comprehen-sive techniques were applied,such as end-suspended piles,anchors,slope,steel pipe pile and so on. The calculated re-sults were compared with the field measured values.The results show that the mainly deformation of supporting construc-tion appear in soil part.The supporting methed we talked above could control the displacement of excavation and builid-ings surrounded,reduce the construction cost. These datas were useful for the engineering.