›› 2011, Vol. 32 ›› Issue (7): 2007-20012.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Testing study of permeability characteristics of unsaturated compacted expansive soils

CUI Ying，MIAO Lin-chang   

  1. Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
  • Received:2010-05-17 Online:2011-07-10 Published:2011-06-30

PDF (Chinese)

1712

Abstract: Compacted expansive clay is widely used as impermeable material of liner in the garbage landfill and prevention fill of nuclear waste material treatment. The permeability characteristics of expansive clay will effect on anti-seepage effect of liner cushion clay. Due to the difficulty of measuring permeability coefficient directly, the parameter is also evaluated by indirect method which is hard to truly explain permeability characteristics of unsaturated soil and phenomenon of migration of water. This paper discusses measuring permeability coefficient directly by GDS system and quantitatively analyses the influence of structure by permeability test and the SEM test which show the micro and macro-structure characteristics in the permeability process. The results show that the volume deformation of unsaturated expansive soil in permeation process is due to pore air is compressed and changes in pore structure. The pore water permeability coefficient of unsaturated expansive soil is controlled by suction, cell pressure, dry density and degree of saturation of soil samples.

Key words: compacted expansive soil, unsaturated soil, permeability characteristics, microstructure

CLC Number: 

  • TU 411
[1] CHENG Hao, TANG Hui-ming, WU Qiong, LEI Guo-ping, . An elasto-plasticity extended Cam-clay model for unsaturated soils using explicit integration algorithm in FEM with hydraulic hysteresis [J]. Rock and Soil Mechanics, 2020, 41(2): 676-686.
[2] CHENG Tao, YAN Ke-qin, HU Ren-jie, ZHENG Jun-jie, ZHANG Huan, CHEN He-long, JIANG Zhi-jie, LIU Qiang, . Analytical method for quasi-two-dimensional plane strain consolidation problem of unsaturated soil [J]. Rock and Soil Mechanics, 2020, 41(2): 453-460.
[3] DENG Zi-qian, CHEN Jia-shuai, WANG Jian-wei, LIU Xiao-wen, . Constitutive model and experimental study of uniform yield surface based on SFG model [J]. Rock and Soil Mechanics, 2020, 41(2): 527-534.
[4] LI Xiao-xuan, LI Tao, PENG Li-yun, . Elastoplastic two-surface model for unsaturated cohesive soils under cyclic loading with controlled matric suction [J]. Rock and Soil Mechanics, 2020, 41(2): 552-560.
[5] ZHANG Shan-kai, LENG Xian-lun, SHENG Qian, . Study of water swelling and softening characteristics of expansive rock [J]. Rock and Soil Mechanics, 2020, 41(2): 561-570.
[6] LEI Hua-yang, HU Yao, LEI Shuang-hua, QI Zi-yang, XU Ying-gang, . Analysis of microstructure characteristics of air-booster vacuum preloading for ultra-soft dredger fills [J]. Rock and Soil Mechanics, 2019, 40(S1): 32-40.
[7] ZHAO Bo, ZHANG Guang-qing, TANG Mei-rong, ZHUANG Jian-man, LIN Can-kun, . Mechanism of the effect of long-term water injection on mechanical properties of tight sandstone [J]. Rock and Soil Mechanics, 2019, 40(9): 3344-3350.
[8] DENG Hua-feng, ZHI Yong-yan, DUAN Ling-ling, PAN Deng, LI Jian-lin. Mechanical properties of sandstone and damage evolution of microstructure under water-rock interaction [J]. Rock and Soil Mechanics, 2019, 40(9): 3447-3456.
[9] ZHOU Feng-xi, LIU Hong-bo, . Propagation characteristics of Rayleigh waves in unsaturated soils [J]. Rock and Soil Mechanics, 2019, 40(8): 3218-3226.
[10] ZHAN Liang-tong, HU Ying-tao, LIU Xiao-chuan, CHEN Jie, WANG Han-lin, ZHU Bin, CHEN Yun-min. Centrifuge modelling of rainfall infiltration in an unsaturated loess and joint monitoring of multi-physical parameters [J]. Rock and Soil Mechanics, 2019, 40(7): 2478-2486.
[11] YIN Xiao-meng, YAN E-chuan, WANG Lu-nan, CHEN Li, . Quantitative microstructure information extraction and microscopic morphology analysis of anisotropic schist [J]. Rock and Soil Mechanics, 2019, 40(7): 2617-2627.
[12] ZHOU Feng-xi, GAO Guo-yao, . Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil [J]. Rock and Soil Mechanics, 2019, 40(6): 2050-2058.
[13] YIN Xiao-meng, YAN E-chuan, WANG Lu-nan, WANG Yan-chao, . Effect of water and microstructure on wave velocity anisotropy of schist and its mechanism [J]. Rock and Soil Mechanics, 2019, 40(6): 2221-2230.
[14] WANG Jun-min, XIONG Yong-lin, YANG Qi-lai, SANG Qin-yang, HUANG Qiang. Study of the dynamic elastoplastic constitutive model for unsaturated soil [J]. Rock and Soil Mechanics, 2019, 40(6): 2323-2331.
[15] TAO Gao-liang, WU Xiao-kang, GAN Shi-chao, XIAO Heng-lin, MA Qiang, LUO Chen-chen, . Experimental study and model prediction of permeability coefficient of unsaturated clay with different initial void ratios [J]. Rock and Soil Mechanics, 2019, 40(5): 1761-1770.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] ZHAO Hong-bao, YIN Guang-zhi, LI Xiao-shuang. Experimental study of characteristics of tensile burned gritstone[J]. , 2010, 31(4): 1143 -1146 .
[2] KUANG Yu-chun, WU Kai-song, YANG Ying-xin, MA De-kun. Simulation model of drilling process of three-cone bit[J]. , 2009, 30(S1): 235 -238 .
[3] CHEN Zhi-qiang, ZHANG Yong-xing, ZHOU Jian-ying. Experimental study of deep tunnel surrounding rock rockburst proneness with similarity material simulating method based on digital speckle correlation technique[J]. , 2011, 32(S1): 141 -148 .
[4] DU Wen-qi, WANG Gang. Statistical analysis of earthquake-induced sliding displacements of earth structures[J]. , 2011, 32(S1): 520 -0525 .
[5] YAN Zhi-hua, LIU Zhi-wei, LIU Hou-jian. Treatment and parameter selection of high slope of a power plant located in the terraces of Yellow River[J]. , 2009, 30(S2): 465 -468 .
[6] XU Zhen-hao , LI Shu-cai , LI Li-ping , HOU Jian-gang , SUI Bin , SHI Shao-shuai. Risk assessment of water or mud inrush of karst tunnels based on analytic hierarchy process[J]. , 2011, 32(6): 1757 -1766 .
[7] WEN Shi-qing , LIU Han-long , CHEN Yu-min. Analysis of load transfer characteristics of single grouted gravel pile[J]. , 2011, 32(12): 3637 -3641 .
[8] GONG Si-yuan，DOU Lin-ming，HE Jiang，HE Hu，LU Cai-ping，MU Zong-long. Study of correlation between stress and longitudinal wave velocity for deep burst tendency coal and rock samples in uniaxial cyclic loading and unloading experiment[J]. , 2012, 33(1): 41 -47 .
[9] ZHONG Sheng ，WANG Chuan-ying ，WU Li-xin ，TANG Xin-jian ，WANG Qing-yuan. Borehole radar response characteristics of point unfavorable geo-bodies： forward simulation of its surrounding rock and filling condition[J]. , 2012, 33(4): 1191 -1195 .
[10] CHAI Shou-xi，WANG Pei，WANG Xiao-yan. Effect of reinforcing range and cross section of wheat straw on shear strength of reinforced soil[J]. , 2013, 34(1): 123 -127 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd