| 基质吸力变化引起的体积应变研究 |
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| 引用本文： | 戚国庆,黄润秋.基质吸力变化引起的体积应变研究[J].工程地质学报(英文版),2015,23(3):491-497. |
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| 作者姓名： | 戚国庆 黄润秋 |
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| 作者单位： | 1.中国电建集团贵阳勘测设计研究院有限公司 贵阳 550081; |
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| 基金项目： | 贵州省科学技术基金[黔科合 J 字(2010)2022]项目资助． |
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| 摘 要： | 与降雨有关的边坡表层变形位移,其根源是基质吸力降低引起的非饱和土体积应变。利用某滑坡体的原状样及其重塑样,分别在100kPa、200kPa围压作用下,采用单纯增加基质吸力的应力路径,对基质吸力引起的体积应变,进行试验测试。结果显示: (1)试样的体应变,随基质吸力的增大,单调增大,服从对数函数关系;(2)围压由100kPa增加到200kPa的试样体积模量,随基质吸力的增大,单调增大,服从幂函数关系;(3)与基质吸力有关的体积变化系数,随基质吸力的增大,单调减小,服从幂函数关系;并且当基质吸力大于200kPa以后,随基质吸力增大,体积变化系数接近于常数,约为0.0059左右。在此基础上,本文针对这种由单纯基质吸力变化引起的非饱和土体积应变规律及机理,进行了探讨。
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| 关 键 词： | 基质吸力-体积应变关系 非饱和土 体积模量 体积变化系数 |
| 收稿时间： | 2014-10-16 |
LABORATORY TEST STUDY ON VOLUMETRIC STRAIN DUE TO A SIMPLE CHANGE OF SUCTION |
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| QI Guoqing,HUANG Runqiu.LABORATORY TEST STUDY ON VOLUMETRIC STRAIN DUE TO A SIMPLE CHANGE OF SUCTION[J].Journal of Engineering Geology,2015,23(3):491-497. |
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| Authors: | QI Guoqing HUANG Runqiu |
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| Institution: | 1.Power-China Guiyang Engineering Corporation Limited, Guiyang 550081;2.State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of Technology，Chengdu 610059 |
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| Abstract: | The slope surface deformation and displacement are related to the precipitation. The root cause is volumetric strain caused by suction decreasing in unsaturated soils. By simply increasing the suction stress path, under net confining pressure of 100kPa or 200kPa, the test of volumetric strain due to suction is done on undisturbed landslide samples and its remolded sample. The results show: (1)The volumetric strain of the specimen monotonically increases with suction increasing, which obeys logarithm function relation; (2)Bulk modulus during net confining pressure from 100kPa to 200kPa, monotonically increases with suction increasing, which obeys the power function relationship; (3)Coefficient of volume change associated with the suction monotonically decreases with suction increasing, which obeys the power function relationship. When the suction is greater than 200kPa, with the suction increases, the volume change of coefficients is close to a constant of about 0.0059. Based on these results, the pattern and mechanics of volumetric strain caused by a simple suction change are discussed in this paper. |
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| Keywords: | Suction-volume strain relationship Unsaturated soils Bulk modulus Coefficient of volume change associated with the suction |
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