Damage and Mechanical Property Deterioration of Coal Rocks Under Different Water Flooding
In this paper,the water content,the number of wet and dry cycles and the mineralization degree of high-salt mine water of coal samples were set as the research objects to systematically study the nondestructive water absorption characteristics of coal samples and the damage law of coal samples under different water immersion effects.The damage characteristics and fracture development evolution of coal samples under different variables were analyzed by combining the characteristic parameters obtained from acoustic emission tests and quantifying the quantitative relationships between compressive strength and elastic modulus with different water content,different number of wet and dry cycles and different mineralization degrees.The test results show that:the compressive strength and elastic modulus of water-bearing coal samples have linearly decreasing relationships with water content and mineralization,and exponentially decreasing relationships with the number of wet and dry cycles;the percentage of shear fractures inside the coal samples gradually increases with the increase of water content (water content,number of wet and dry cycles),and then the increase is smaller;all three have degradation effects on the mechanical properties of coal rock media.The water immersion test effectively reveals the damage mechanism of coal-rock media under the coupling effect of "water-rock" under different water immersion conditions,which can provide an effective reference for ensuring the stability of coal pillar dams in underground reservoirs,and at the same time,it can provide an effective solution to the problems such as the difficulty of effective storage and utilization of mine water generated in the coal mining process and the loss of large amount of water resources.It can also provide a solution to the problems such as the difficulty of effective storage and utilization of mine water and the loss of large amount of water resources during coal mining.
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