Constitutive model of coal damage under gas degradation and load

doi:10.16265/j.cnki.issn 1003-3033.2021.07.011

Abstract

Abstract: In order to effectively prevent coal mine gas power disaster, it is necessary to study mechanism of gas degradation of coal and evolution characteristic of coal damage. Raw coal sample was taked as research object, triaxial compression test of coal under different gas pressures was carried out by using triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane. Damage constitutive model of coal under action of gas degradation and load was established, and rationality of model was verified by test results. The results show that cumulative damage of coal is almost 0 before plastic deformation stage, and damage degree increases rapidly after peak.With the increase of gas pressure, peak strength and elastic modulus of coal are both decrease, initial damage of coal increases significantly after gas action. Cohesiveness of coal decreases linearly with the increase of gas pressure. Mohr-Coulomb criterion is modified through relationship between cohesion and gas pressure, and stress-strain relationship of coal considering gas deterioration is quantified. It has a high degree of agreement with test results, which can well reflect damage evolution process of coal under different gas pressures.

Key words: gas, degradation-load, coal damage, constitutive model, cohesion, Mohr-Coulomb criterion

CLC Number:

X936

LI Bobo, WU Xuehai, REN Chonghong, XU Jiang, ZHANG Yao, GAO Zheng. Constitutive model of coal damage under gas degradation and load[J]. China Safety Science Journal, 2021, 31(7): 76-81.

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