Experimental research on creep properties of limestone under fluid–solid coupling

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• 作者：Yang Liu ; Changwu Liu ; Yaming Kang ; Ding Wang ; Dingyang Ye
• 关键词：Underground engineering ; Water ; Hydraulic confining pressure ; Fluid–solid coupling ; Rock creep ; Multi ; channel creep testing system
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：73
• 期：11
• 页码：7011-7018
• 全文大小：2,625 KB
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• 作者单位：Yang Liu (1) (2)
  Changwu Liu (1) (2)
  Yaming Kang (3)
  Ding Wang (2) (4)
  Dingyang Ye (1) (2)
  
  1. State Key Laboratory of Hydraulics and Mountain River Engineering (Sichuan University), Chengdu, 610065, Sichuan, China
  2. College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, Sichuan, China
  3. School of Chemistry and Chemical Engineering, Beifang University of Nationalities, Yinchuan, 750021, Ningxia, China
  4. Sichuan Provincial Design and Research Institute of Coalfield Geologic Engineering, Chengdu, 610072, Sichuan, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Water is one of the important factors influencing the long-term stability of underground construction. Water?becomes a huge threat to the safe operation of underground construction because of the increasing hydraulic pressure in deep stratum. In the present study, compression creep tests of limestone not covered by rubber jacket under different hydraulic confining pressures were carried out by using the self-developed “YSL-200 multi-channel rock creep testing system- Based on the analysis of test data, the creep properties of limestone under fluid–solid coupling were studied. Then the effect of water and hydraulic confining pressure on the failure mechanism and creep properties were discussed. The results show that the hydraulic confining pressure has a significant influence on the rock creep properties. Compared with the confining pressure in conventional triaxial creep test, under the long-term effect of hydraulic confining pressure, water seeps into the rock through fissures or cracks and applies splitting effects on the crack surface, which promotes crack propagation, increases the damage of rock and accelerates the rock failure process. Both the value of strain and the creep strain rate increase with the increasing of hydraulic confining pressure, but the increase magnitude of the creep strain rate is much smaller. The results can provide a reference for the study of long-term stability of underground structure under fluid–solid coupling.