| 摘要: |
| 利用GDS空心圆柱扭剪系统对原状软黏土进行大周次循环扭剪试验,分析了在主应力轴旋转条件下不同有效围压和不同循环应力比下软黏土的软化特性.结果表明：不同循环次数下土体的剪切应力应变滞回曲线有明显的差异,随着循环次数的增加,土体的剪切模量减小;在相同有效围压条件下,随着循环应力比的增大,土体轴向模量和剪切模量的软化指数降低;在相同循环应力比下,随着有效围压的增大,土体受到的侧向约束增大,轴向模量和剪切模量的软化指数减小. |
| 关键词: 软黏土 模量 软化特性 主应力轴旋转 |
| DOI：103969/j.issn.1007 9629201905022 |
| 分类号: |
| 基金项目:河南省高等学校重点科研项目(20A560021);国家自然科学基金重点项目(51639002) |
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| Experimental Study on Softening Characteristics of Soft Clay under Continuous Principal Stress Axis Rotation |
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WANG Yuke1, MA Lu2, ZENG Changnü3, ZHANG Chongbo1, CHEN Can1
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1.College of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;2.College of Civil ＆ Transportation Engineering, Hohai University, Nanjing 210098, China;3.College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China
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| Abstract: |
| GDS hollow cylindrical apparatus was used to investigate the softening characteristics of soft clay under different effective confining pressures and different cyclic stress ratios. The test results show that the rotation of the principal stress axis makes the soil easier to soften. With the loading cycles increasing, the torsional stress strain hysteresis curves of soil are different from each other, and the shear modulus of soil decreases. Under the same effective confining pressure, the softening index of soil decreases gradually with the increasing cyclic stress ratio. Under the same cyclic stress ratio, the softening index of axial and shear modulus soil decreases with increasing effective confining pressure. |
| Key words: soft clay modulus softening characteristic principal stress axis rotation |
