Fluid permeability of sedimentary rocks in a complete stress-strain process

被引:160
|
作者
Wang, JA [1 ]
Park, HD [1 ]
机构
[1] Seoul Natl Univ, Sch Civil Urban & Geosyst Engn, Kwanak Gu, Seoul 151742, South Korea
关键词
permeability; hydraulic conductivity; complete stress-strain process; sedimentary rock; ground water flow;
D O I
10.1016/S0013-7952(01)00088-6
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The permeability of sedimentary rocks during triaxial compression tests was investigated to relate it to the complete strain-stress process. It was found that the permeability was not constant, but varied with the stress and strain states in the rocks. Prior to the peak strength, the permeability decreases with increasing load. A dramatic increase in permeability occurs during the strain softening period. In the present study, in situ measurements of fluid flow and pressure in floor strata was carried out in a double longwall mining face in the Yangzhuang colliery. These measurements show that both the strata pressure and the position with respect to the mining face influence the hydrogeologic properties. ne permeability increased in the floor strata behind the mining face because those mining induced fractures opened as the strata pressure decreased. To better understand this change in hydraulic behavior around the mining faces, 3-D numerical modeling was carried out. The model provides the general picture of the stress distribution and failure zone both in the floor and roof strata. The field and model results demonstrate the importance of changes in the stress and strain states on the hydrogeology of a site. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:291 / 300
页数:10
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