Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (2): 315-323.doi: 10.16285/j.rsm.2020.0848

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mechanical properties and damage constitutive model of coal under the coupled hydro-mechanical effect

LI Bo-bo1, 2, 3, WANG Zhong-hui1, REN Chong-hong1, ZHANG Yao1, XU Jiang4, LI Jian-hua1   

  1. 1. College of Mining, Guizhou University, Guiyang, Guizhou 550025, China; 2. National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guizhou University, Guiyang, Guizhou 550025, China; 3. Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guizhou University, Guiyang, Guizhou 550025, China; 4. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
  • Received:2020-06-19 Revised:2020-12-04 Online:2021-02-10 Published:2021-02-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52064007，51804085，51911530203).

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Abstract: In order to explore the impact of moisture on the mechanical properties of coal, the triaxial compression tests of raw coal with different moisture contents are carried out by using the triaxial servo-controlled seepage equipment for thermal-hydro- mechanical coupling in coal containing methane. Based on elastic damage mechanics, the damage variables of coal with different moisture contents are deduced, and the damage constitutive model of coal under hydro-mechanical coupling is established, the deformation characteristics of coal with different moisture contents are obtained. The results show that: (1) the deformation and failure process of coal under different moisture contents are similar, which can be divided into pre-peak stress stage, post-peak stress stage and residual stress stage; (2) as the moisture content increases, the peak stress, elastic modulus and brittleness of coal decrease, but the Poisson's ratio increases; (3) the damage constitutive model of coal can better represent the deformation characteristics of coal in the complete stress-strain process under different moisture contents, which is suitable for the analysis of the triaxial compressive stress-strain of coal under different moisture contents; (4) both the damage correction coefficient q and the damage constitutive coefficient n determine the curve shape of the damage constitutive model. The damage correction coefficient reflects the characteristics of residual deformation of coal, and the damage constitutive coefficient reflects different degrees of post-peak strain softening of the stress-strain curve.

Key words: coal, damage, moisture content, constitutive relation, coupled hydro-mechanical

CLC Number: 

  • TU 452
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