Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test

WANG Shi-ji; HAN Yi; LI Xian; SHI Lang-jing; ZHANG Ya-qian; CHEN Zheng-han

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Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test

更新时间：2026-06-25

- Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test
- Vol. 34, Issue 10, (2013)
- 作者机构：
  
  1. 西南大学工程技术学院建筑系,重庆,400716
  2. 后勤工程学院建筑工程系,重庆,400041
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：18 October 2013，
  
  Published：2013
- 稿件说明：
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WANG Shi-ji, HAN Yi, LI Xian, et al. Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test[J]. 2013, 34(10).
DOI：

WANG Shi-ji, HAN Yi, LI Xian, et al. Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test[J]. 2013, 34(10). DOI：

摘要

通过8组不同孔径破损膨胀土的CT-三轴试验，研究了圆柱孔破损重塑膨胀土的变形、强度特性以及破损结构的演化规律。试验结果表明：圆柱孔破损对膨胀土的强度有明显的弱化作用，但破损孔径大小的影响不大。吸力一定时，圆柱孔面积变化随着净围压的增加而减小；净围压相同时，吸力大的试样圆柱孔面积减少得越大。净围压在破损重塑膨胀土结构演化中发挥重要作用，随着净围压从50 kPa增加到200 kPa，CT图像的均值（ME值）提高幅度增大，试样内部的平均密度变大；相应地，CT图像的标准差（SD值）降低的幅度也增大，试样结构趋于均匀化。

Abstract

The properties of deformation

strength and structural evolution of cylindrical hole damaged expansive soil are investigated by eight CT-triaxial tests. The results show that the strength of the samples with the cylindrical holes is significantly weakened because of the hole damage. Howerver

the hole size has little influence on the strength of the sample. The hole section area decreases when net confining pressure increases under a certain suction. The reduction of the hole section area is more obvious when the suction is larger under the same net confining pressure. Moreover

the net confining pressure plays an important role on the structural evolution of the cylindrical holes in the remolded expansive soils. The increment of the mean value (ME value) is enhanced gradually when the net confining pressure is changed from 50 kPa to 200 kPa. It means the sample becomes denser when the confining pressure is larger. Accordingly

the decrement of the standard deviation (SD value) increases gradually. The structure of the sample becomes homogenized during the test.

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