Experimental study and predictive analysis of shear strength characteristics of gassy sand in Hangzhou metro project

WANG Yong; TIAN Hu-nan; KONG Ling-wei; GUO Ai-guo

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Experimental study and predictive analysis of shear strength characteristics of gassy sand in Hangzhou metro project

更新时间：2026-06-25

- Experimental study and predictive analysis of shear strength characteristics of gassy sand in Hangzhou metro project
- Vol. 29, Issue S1, (2008)
- 作者机构：
  
  中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU432
- Online First：15 April 2016，
  
  Published：2008
- 稿件说明：
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WANG Yong, TIAN Hu-nan, KONG Ling-wei, et al. Experimental study and predictive analysis of shear strength characteristics of gassy sand in Hangzhou metro project[J]. 2008, 29(S1).
DOI：

WANG Yong, TIAN Hu-nan, KONG Ling-wei, et al. Experimental study and predictive analysis of shear strength characteristics of gassy sand in Hangzhou metro project[J]. 2008, 29(S1). DOI：

摘要

从地质成因角度分析了杭州地铁原始储气砂层的饱和度和基质吸力的变化范围。利用GDS非饱和三轴试验系统对变化范围内的储气砂抗剪强度特性进行了测定，得到非饱和储气砂土的抗剪强度指标。试验结果表明

砂土抗剪强度随吸力的增大而增加，当含水率大于残余含水率时，吸力对储气砂土的抗剪强度影响较为显著；小于残余含水率时，吸力对储气砂土的抗剪强度的贡献较小。将强度试验值与各抗剪强度预测公式的预测值进行了对比分析，认为公式可合理地用于表述杭州地铁储气砂土的抗剪强度特性。

Abstract

In view of geologic origin

the span of saturated degree and matric suction of the gassy sand in Hangzhou metro(MTR) project are analyzed. The shear strength characteristics within the span of matric suction of the gassy sand are determined by GDS unsaturated triaxial system

and the shear strength index of the unsaturated gassy sand is obtained. The results show that the shear strength increases with the increase of matric suction of the gassy sand; and the influence on the shear strength is significant when the moisture content is greater than residual moisture content. The contribution of matric suction to the shear strength is not obvious when the moisture content is less than residual moisture content. The values from shear strength test and from predictive formula are compared and analyzed. Results show that the shear strength formula can be used to describe the strength characteristics of Hangzhou MTR gassy sand reasonably.

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