Techno Press
You logged in as Techno Press

Geomechanics and Engineering
  Volume 18, Number 6, August30 2019, pages 567-574
DOI: http://dx.doi.org/10.12989/gae.2019.18.6.567
 


Experimental study on seepage characteristics of large size rock specimens under three-dimensional stress
Wenbin Sun, Yanchao Xue, Liming Yin and Junming Zhang

 
Abstract
    In order to study the effect of stress and water pressure on the permeability of fractured rock mass under three-dimensional stress conditions, a single fracture triaxial stress-seepage coupling model was established; By using the stress-seepage coupling true triaxial test system, large-scale rock specimens were taken as the research object to carry out the coupling test of stress and seepage, the fitting formula of permeability coefficient was obtained. The influence of three-dimensional stress and water pressure on the permeability coefficient of fractured rock mass was discussed. The results show that the three-dimensional stress and water pressure have a significant effect on the fracture permeability coefficient, showing a negative exponential relationship. Under certain water pressure conditions, the permeability coefficient decreases with the increase of the three-dimensional stress, and the normal principal stress plays a dominant role in the permeability. Under certain stress conditions, the permeability coefficient increases when the water pressure increases. Further analysis shows that when the gob floor rock mass is changed from high stress to unloading state, the seepage characteristics of the cracked channels will be evidently strengthened.
 
Key Words
    single fractured rock mass; stress-seepage coupling; true triaxial test system; floor water-inrush
 
Address
Wenbin Sun,Liming Yin and Junming Zhang: College of Mining and Safety Engineering, Shandong University of Science and Technology,Qingdao 266590, People\'s Republic of China

Yanchao Xue: 1.)College of Mining and Safety Engineering, Shandong University of Science and Technology,
Qingdao 266590, People\'s Republic of China
2.) School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, People\'s Republic of China

 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2021 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: info@techno-press.com