土岩组合地层基坑工程变形监测分析

• 作 者: 刘红军 张庚成 刘涛
• 机 构: 海洋环境与生态教育部重点实验室,中国海洋大学环境科学与工程学院,
• 出 处: 岩土工程学报
• 发表日期: 2010年S2期
• 关键词: 土岩结合 吊脚桩 基坑变形 有限元

介绍了青岛岩石地区土岩组合的一个典型超深基坑工程案例。鉴于地层的特殊性以及基坑开挖深度,采用吊脚桩加锚索支护体系,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在有效的控制基坑及周围环境变形的同时,大大地减少工程造价,以期为今后类似工程提供有益的借鉴。

A case study of a typical ultra-deep foundation pit with soil-rock assemblage in Qingdao rock area is introduced. In view of the particularity of the strata and the excavation depth of the foundation pit, the hanging foot pile and the anchor cable support system are used, and the partial grading is combined with the pre-support of the steel pipe pile. The comparison between the numerical results of the finite element analysis and the measured data in the field shows that the deformation of the retaining structure mainly concentrates in the part of the soil in the rock area where the overlying soil is thin. Adopting the above support system can effectively control the deformation of the foundation pit and the surrounding environment and greatly reduce the construction cost so as to provide useful reference for similar projects in the future.