›› 2010, Vol. 31 ›› Issue (12): 3746-3750.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of gas permeability of unsaturated clayey sand

MIAO Qiang-qiang1, CHEN Zheng-han1, ZHANG Lei1, HUANG Xue-feng1, QIAN Ni-gui2   

  1. 1. Department of Architecture & Civil Engineering, Logistical Engineering University, Chongqing 400041, China; 2. Guangdong Hualu Limited Company of Traffic Science and Technology, Guangzhou 510400, China
  • Received:2009-07-18 Online:2010-12-10 Published:2010-12-21

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Abstract:

In order to understand factors affected gas permeability of unsaturated clayey sand, through rebuilding triaxial apparatus, it can be used to measure gas permeability of unsaturated soils. The modified apparatus has advantages as follows: such as structure simpleness, making model expediency, good model uniform, stable loading system, comprehensive measuring pressure gradient, enhancing measuring precision. And it resolves problems that measuring gas volume no easy. At same time it resolves a problem that gas flow out rigid wall and model edge. The relationship between flowing velocity and coefficient of permeability is given by that apparatus, under different dry densities and different water contents. Flowing velocity of unsaturated soils can be expressed by Darcy law under the range of water content and dry density in this test. The function of gas coefficient of permeability, water content and dry density are given from a great deal of test data.

Key words: unsaturated soils, permeability, water content, coefficient of permeability

CLC Number: 

  • TU 411
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