Selection and application research on shear strength index of soft soil for ultra deep foundation pit in Wuhan

MA Yun; LI Song; XU Guang-li; LONG Xiao-dong

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Selection and application research on shear strength index of soft soil for ultra deep foundation pit in Wuhan

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- Selection and application research on shear strength index of soft soil for ultra deep foundation pit in Wuhan
- Vol. 35, Issue S2, (2014)
- 作者机构：
  
  1. 中国地质大学(武汉) 工程学院,武汉,430074
  2. 中南勘察设计院(湖北)有限责任公司,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： null
- Online First：12 November 2014，
  
  Published：2014
- 稿件说明：
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MA Yun, LI Song, XU Guang-li, et al. Selection and application research on shear strength index of soft soil for ultra deep foundation pit in Wuhan[J]. 2014, 35(S2).
DOI：

MA Yun, LI Song, XU Guang-li, et al. Selection and application research on shear strength index of soft soil for ultra deep foundation pit in Wuhan[J]. 2014, 35(S2). DOI：

摘要

以武汉长江Ⅰ级阶地中海国际大厦超深基坑工程为研究背景，使用静压薄壁取土器对该场地软土地层进行取样，并结合室内土工试验、利用数理统计原理获取软土地层的抗剪强度指标，并与采用岩芯管取样所得到的(qq)抗剪强度指标进行对比。同时运用Midas GTS三维有限元软件开展对中海国际大厦超深基坑工程的三维数值仿真分析，主要研究了超深基坑地下连续墙水平位移及地层土压力的变化规律，并与实测数据进行对比分析。研究发现：使用静压薄壁取土器取样对地层的扰动较岩芯管取样小，得到的土体抗剪强度指标更为可靠；选取cu抗剪强度指标，地下连续墙水平位移和地层土压力更接近实测数据，cq指标次之。建议对于一级重要性等级的基坑首选cu指标，对于二、三级重要性等级基坑可采用cq指标。

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