Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (9): 2515-2524.doi: 10.16285/j.rsm.2021.2013

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Shear-seepage properties of intact argillaceous shale under different injection water pressures

MA Li-yao1, 2, HU Bin1, 2, CHEN Yong1, 2, CUI Kai1, 2, DING Jing1, 2   

  1. 1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China; 2. Hubei Key Laboratory for Efficient Utilization and Block Making of Metallurgical and Mineral Resources, Wuhan, Hubei 430081, China
  • Received:2021-12-01 Revised:2022-05-06 Online:2022-09-12 Published:2022-09-12
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (U1802243, 41672317), Hubei Province Technology Innovation Special Project (Major Project) (2017ACA184) and the Innovation Team of Cultivating Major Science and Technology Projects of Wuhan University of Science and Technology (2018TDX01).

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Abstract:

 In order to explore the evolution law of the shear-seepage characteristics of the rock mass in the high pressure hydraulic infiltration zone and fluctuation zone under the coupling action of pressure shear load and fluid infiltration, a new shear-seepage coupling test and shear creep-seepage coupling test were performed on saturated argillaceous shale under different injection water pressures using a new rock shear-seepage coupling test system. The test results show that: 1) With the increase of injection water pressure, the peak shear strength, peak normal deformation and shear creep failure strength of saturated argillaceous shale decrease, which indicates that injection water pressure has a degradation effect on the mechanical strength of rock samples. 2) During the shear-seepage coupling test, the shear stress and normal deformation of the rock sample have obvious up and down fluctuations at the end of the linear elastic change, accompanied by the outflow of water. The sudden changes of shear stress and normal deformation have time-dependent consistency. 3) During the shear creep-seepage coupling test, the seepage rate of water is positively correlated with the injection water pressure. With the increase of the applied level of shear load, the creep deformation of the rock sample is larger and the cumulative amount of seepage water per unit time also increases.

Key words: argillaceous shale, injection water pressure, shear-seepage coupling, test system, mechanical properties

CLC Number: 

  • TU452
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