Plastic deformation-based constitutive relation of coal damage and permeability model

Authors

WU Xuehai, College of Mining, Guizhou University, Guiyang 550025, China
LI Bobo, College of Mining, Guizhou University, Guiyang 550025, China; National Joint Engineering Laboratory for the Utilization of Dominant Mineral Resources in Karst Area, Guizhou University, Guiyang 550025, China; Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang 550025, ChinaFollow
WANG Xin, Bijie Zhongcheng Energy Co., Ltd., Bijie 552109, China
GAO Zheng, College of Mining, Guizhou University, Guiyang 550025, China
LI Jianhua, College of Mining, Guizhou University, Guiyang 550025, China
XU Jiang, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Abstract

Coal and gas outburst induced by mining disturbance is one of the main gas dynamic disasters in coal mine production. In order to systematically explore the evolution characteristics of coal damage and the law of gas seepage under mining disturbance, the whole stress strain–seepage experiment under different gas pressures was carried out. The generalized Hooke's law was modified by considering the effects of gas adsorption and thermal expansion, the plastic deformation-based constitutive relation of coal damage was established, and the piecewise permeability model considering the damage was further constructed. The results shown that the coal permeability can be divided into two stages: before and after the peak, taking the sudden change point of permeability as the boundary. The permeability decreases exponentially before the peak and increases sharply after the peak, and the peak compressive strength and elastic modulus decrease with the increase of gas pressure. The evolution law of axial plastic strain and damage of coal has good consistency, and both of them show a trend of little change before the peak and rapid increase after the peak. The damage model and permeability model were verified by using the experiment data under different gas pressures and 50℃, and the theoretical curves were in good agreement with the experiment data, which shows that the new model can better reflect the damage evolution law and gas seepage characteristics in the process of coal damage and the instability under different conditions.

Keywords

coal and gas outburst, plastic deformation, damage, permeability, mining disturbance

DOI

10.3969/j.issn.1001-1986.2021.06.016

Recommended Citation

WU Xuehai, LI Bobo, WANG Xin, et al. (2021) "Plastic deformation-based constitutive relation of coal damage and permeability model," Coal Geology & Exploration: Vol. 49: Iss. 6, Article 17.
DOI: 10.3969/j.issn.1001-1986.2021.06.016
Available at: https://cge.researchcommons.org/journal/vol49/iss6/17

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