Global Geology 2016, 19(3) 177-181 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
rock single fracture
rock seepage
stress states
stress history
Authors
ZHANG Chi
ZHANG Yanjun
LI Zhengwei
ZHANG Tong
LIU Tong and XIE Yangyang
PubMed
Article by Zhang C
Article by Zhang Y
Article by Li Z
Article by Zhang T
Article by Liu TAXY

Experimental study of seepage characteristics of single rock fracture based on stress states and stress history

ZHANG Chi, ZHANG Yanjun, LI Zhengwei, ZHANG Tong, LIU Tong and XIE Yangyang

College of Construction Engineering,Jilin University,Changchun 130012,China

Abstract

Through seepage tests under different loading and unloading confining pressures and different hydrau- lic gradients,the authors studied the effects of stress states and stress history on fracture permeability evolution for single granite fracture and sandstone fracture. The results show that there exists a linear relationship between the seepage discharge and osmotic pressure in sandstone fissure under each level of confining pressure. With the increasing in the confining pressure,the permeability of the fracture decreases,but the decreasing rate is changeing. During the unloading process,the fracture seepage velocity cannot be fully recovered to the size of the loading process. Therefore,in the unloading process of the confining pressure,the recovery of fracture per- meability shows obvious hysteresis effects. The flow rate of the fracture remains unchanged during five cycles of loading and unloading processes of the confining pressure. In each cycle, the evolution character of the flow rate with the confining pressure remains unchanged. These experiments show that the seepage characteristics of sandstone and granite fractures are not the same under the same stress state.

Keywords rock single fracture   rock seepage   stress states   stress history  
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