›› 2012, Vol. 33 ›› Issue (11): 3299-3305.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Residual shear behaviour and particle crushing of an infilled joint soil under high stress

ZHAO Yang1, 2，ZHOU Hui1，FENG Xia-ting1，SHAO Jian-fu1, 3，JIANG Quan1， LU Jing-jing1，JIANG Ya-li4，HUANG Ke4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Resources and Environment, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China; 3. Laboratory of Mechanics of LILLE, Polytechnique of Lille, Lille 59655, France; 4. HydroChina Huadong Engineering Corporation, Hangzhou 310014, China
  • Received:2011-09-06 Online:2012-11-12 Published:2012-11-14

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Abstract: Multi-reversal direct shear test is conducted on the undisturbed and remolded infilled joint soils under in-situ stress where normal stress is as far as 10 MPa for test from a hydropower station. It is revealed that the peak shear strength is higher but decreases more rapidly for the undisturbed samples compared with the remolded ones; however, it seems the residual shear strengths tend to be the same. In addition, a large amount of particle crushing occurs, Br (relative particle crushing potential) is adopted to quantify the degree of particle crushing in the shear zone and the non-shear zone. The results show that the amount of particle crushing in the shear zone is larger than that in the non-shear zone; and the mechanisms of particle crushing are different for the two zones. Furthermore, particle crushing is considered as the main reason for the nonlinear relationship of the residual shear strength under high pressure; the decrease of shear strength (ratio of the residual shear strength to the peak shear strength) is linear with Br and S2 (the ratio of clay fraction before test to the one after test for the shear zone). It is indicated that the energy liberation and continuously generated clay fraction caused by particle crushing decrease the shear strength.

Key words: infilled joint soil, multi-reversal direct shear, residual shear strength, high pressure, particle crushing

CLC Number: 

  • TU 411.3
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