| 黄土坡滑坡滑带土非饱和力学特性试验研究 |
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| 引用本文： | 王君鹭,唐辉明,倪卫达.黄土坡滑坡滑带土非饱和力学特性试验研究[J].工程地质学报(英文版),2015,23(2):211-218. |
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| 作者姓名： | 王君鹭 唐辉明 倪卫达 |
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| 作者单位： | 中国地质大学武汉工程学院 武汉 430074 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(2011 CB710606)资助． |
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| 摘 要： | 以三峡库区黄土坡滑坡临江I号崩滑体的滑带土为研究对象,研究基质吸力对非饱和滑带土的强度与变形等力学性质的影响。利用GDS非饱和反压直剪仪对滑带土进行了不同净法向应力和基质吸力组合下的直剪试验。试验结果表明:相同的基质吸力作用下,滑带土抗剪强度随着净法向应力的增大而增大。当滑带土试样中基质吸力较小时(50kPa),试样剪切过程中的应力-应变曲线,随着净法向应力的增大表现为应变硬化型。之后随着基质吸力的增加,当吸力大于净法向应力时,剪切应力-应变曲线表现为较明显的达到峰值后软化。反之,应力-应变曲线表现为应变硬化型。相同净法向应力下,抗剪强度随着吸力的增大而增大,剪切应力-应变曲线由低法向应力下的达到峰值后软化向高法向应力下的应变硬化转变。剪切过程的轴向位移表现为:当吸力大于净法向应力时,表现为剪胀; 反之,表现为剪缩。滑带土固结排水剪切条件下得到的黏聚力随着基质吸力呈线性增长关系。得到了滑带土的吸力摩擦角b为13.7,有效内摩擦角有较小增长,平均有效内摩擦角15.9。
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| 关 键 词： | 黄土坡滑坡 原状滑带土 非饱和直剪试验 抗剪强度 胀缩性 |
| 收稿时间： | 2014-07-18 |
UNSATURATED MECHANICAL PROPERTY TEST OF SLIDING-ZONE SOIL OF HUANGTUPO LANDSLIDE |
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| WANG Junlu,TANG Huiming,NI Weida.UNSATURATED MECHANICAL PROPERTY TEST OF SLIDING-ZONE SOIL OF HUANGTUPO LANDSLIDE[J].Journal of Engineering Geology,2015,23(2):211-218. |
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| Authors: | WANG Junlu TANG Huiming NI Weida |
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| Institution: | Faculty of Engineering, China University of Geosciences, Wuhan 430074 |
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| Abstract: | This paper investigates the effect of matric suction on the shear strength and deformation mechanical properties of unsaturated sliding-zone soil. It uses the undisturbed sliding-zone soil samples from the Huangtupo riverside slump-mass No. I for the tests. A series of consolidated drained direct shear tests are carried out under different combination of net normal stresses and matric suctions with GDS direct shear system. The experimental results show that an increase in net normal stress results in a higher shear strength under constant matric suction conditions. The stress-strain curve appears strain-hardening behavior as net normal stress increases when matric suction is 50kPa. As matric suction increases and exceeds net normal stress, the stress-strain curve appears a peak shear strength followed by a strain-softening behavior apparently. Or the stress-strain curve appears strain-hardening behavior. Under constant net normal stress conditions, an increase in matric suction results in a higher shear strength. The stress-strain curve changes from a peak shear strength followed by a strain-softening behavior under lower normal stress to a strain-hardening behavior under higher normal stress. The vertical displacement during shearing appears shear dilation when matric suction is greater than net normal stress. Otherwise, the curve appears shear compression. Under consolidation and drain condition, the cohesion of sliding-zone soil increases with matric suction linearly. The unsaturated shear coefficient b is calculated to be 13.7according to the relationship between cohesion versus matric suction. The effective friction angle increases with matric suction slightly. The average effective friction angle is 15.9. |
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| Keywords: | Huangtupo landslide Undisturbed sliding-zone soil Unsaturated direct shear test Shear strength Shear dilation and shear compression property |
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