Macroscopic and microscopic mechanical behavior and seepage characteristics of coal under hydro-mechanical coupling
Understanding the physical,mechanical behavior,and seepage characteristics of coal under hydro-mechanical coupling holds significant importance for ensuring the stability of surrounding rock formations and preventing gas outbursts.Scanning electron microscopy,uniaxial tests,and triaxial tests were conducted to comprehensively analyze the macroscopic and microscopic physical and mechanical characteristics of coal under different soaking times.Moreover,by restoring the stress path and water injection conditions of the protective layer indoors,we explored the coal mining dynamic behavior and the evolution of permeability.The results show that water causes the micro-surface of coal to peel off and cracks to expand and develop.With the increase of soaking time,the uniaxial and triaxial strengths were gradually decreased with nonlinear trend,and decreased by 63.31％and 30.95％after soaking for 240 h,respectively.Under different water injection pressure conditions,coal permeability undergoes three stages during the mining loading process and ultimately increases to higher values.The peak stress of coal,the deviatoric stress and strain at the permeability surge point all decrease with increasing water injection pressure.The results of this research can help improve the understanding of the coal mechanical properties and seepage evolution law under hydro-mechanical coupling.
coalwater intrusionmechanical propertiespermeabilitymacro and micro features
高明忠、高政、杨本高、谢晶、王明耀、郝海春、吴岩、周浪、王静宇
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State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Water Resource & Hydropower,Sichuan University,Chengdu 610065,China
China Railway Engineering Equipment Group Co.,Ltd.,Zhengzhou 451163,China
National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaScience and Technology Program of Sichuan Province,ChinaScience and Technology Program of Sichuan Province,ChinaOpen Fund of State Key Laboratory of Coal Mining and Clean Utilization,China
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