Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K0-consolidation condition

CHU Fu-yong; ZHU Jun-gao; YIN Jian-hua

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Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K0-consolidation condition

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- Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K0-consolidation condition
- Vol. 34, Issue 12, (2013)
- 作者机构：
  
  1. 丽水学院土木工程学系,浙江,丽水,323000
  2. 重庆交通大学水利水运工程教育部重点实验室,重庆,400074
  3. 河海大学岩土力学与堤坝工程教育部重点实验室,南京,210098
  4. 香港理工大学土木及环境工程学系,香港
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411.5
- Online First：19 December 2013，
  
  Published：2013
- 稿件说明：
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CHU Fu-yong, ZHU Jun-gao, YIN Jian-hua. Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K0-consolidation condition[J]. 2013, 34(12).
DOI：

CHU Fu-yong, ZHU Jun-gao, YIN Jian-hua. Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K0-consolidation condition[J]. 2013, 34(12). DOI：

摘要

采用大型三轴剪切仪对不同相对密度的双江口心墙坝覆盖层料，进行了固结及各向等压固结条件下的排水剪切试验，探讨了固结及各向等压固结条件下粗粒土剪胀性的差异，并检验了修正Rowe剪胀方程对固结粗粒土的适用性。结果表明：粗粒土在固结条件下，较各向等压固结条件下的剪胀性明显，且这种差异性在密度较小的粗粒料中体现较为突出，而随着密度的增加，差异性逐渐减弱；对试验数据进行非线性拟合

总结出剪胀因子与相对密度、围压之间的关系式，据此可分析不同紧密程度粗粒料剪胀性的强弱；对固结粗粒土，修正Rowe剪胀方程能较好地描述其剪胀性。

Abstract

Using large-scale shearing device

consolidation-drained triaxial test and isotropic consolidation-drained triaxial test under different confining pressures are performed for three relative densities (0.9

0.8

0.7) overburden material of ShuangJiangKou earth dam. The difference between dilatancy behaviours of coarse-grained soil under -consolidation and isotropic consolidation is investigated. Meanwhile

applicability of the modified Rowe dilatancy equation for coarse-grained soils under -consolidation is tested. The test results show that the dilatancy under -consolidation is more remarkable than that under isotropic consolidation; and this difference is more obvious for coarse-grained soils with lower density. By means of the nonlinear fitting of the results of triaxial tests

a relationship formula for coarse-grained soils under -consolidation and isotropic consolidation among dilatancy factor and relative density and confining pressure is obtained

according to which

the dilatancy’ strength of coarse-grained soil under different consolidations can be judged. For the coarse-grained materials under -consolidation

of which dilatancy characteristics can be reflected well by the modified Rowe dilatancy equation.

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