›› 2015, Vol. 36 ›› Issue (S2): 365-370.doi: 10.16285/j.rsm.2015.S2.050

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of sandstone creep characteristics under stepwise loading pore water pressures

YANG Hong-wei1, 2, XU Jiang2, PENG Shou-jian2, NIE Wen2   

  1. 1. Institute of Mining Enginering, Yibin University, Yibin, Sichuan 644007, China; 2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
  • Received:2014-10-03 Online:2015-08-31 Published:2018-06-14

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Abstract: The studies of, creep and damage of fine sandstone under step loading of pore water pressure are carried out by triaxial compression creep tests using the coal and rock computer controlled rheological testing machine RLW-2000 M. The highlights include studies of volumetric strain(rate) and equivalent pore volume(rate) evolution curves of rock creep under different stepwise loadings of pore water pressure. In addition, evolutions of rock creep curves are analyzed. The results show that the creep curves are consistent with three stages in typical creep process. The evolutions of pore volume are consistent with three stages in damage process of the microholes under stepwise loading of pore water pressure. The theoretical analysis of creep curves by Nishihara model was validated by experiments.

Key words: sandstone, creep, stepwise loading, pore water pressure

CLC Number: 

  • TU 452
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