Correlativity between coal permeability and strain in quasi-plane strain state  

作　　者：Bao-Bin GAO Yun-Peng LIU 

机构地区：[1]Stage Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University), Jiaozuo 454000, China [2]Opening Project of Key Laboratory of Deep Mine Construction, Henan Polytechnic University, Jiaozuo 454000, China [3]School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

出　　处：《Journal of Coal Science & Engineering(China)》2013年第4期493-499,共7页煤炭学报（英文版）

基　　金：Supported by the Key Laboratory Project of Deep Mine Construction （HKLGF201202）; the Nature Science Foundation of Education Department, Henan Province （2011 A440001）; the State Key Laboratory Cultivation Base Project for Gas Geology and Gas Control （WS2012B06）

摘　　要：To simulate the variety of big coal sample permeability during the rupture process under quasi-plane strain state, a series of experiments have been performed by a set of self-made coal-gas coupling test system. The test results indicate that the development trend between the permeability rate-strain curve and the stress-strain curve of big coal sample is almost consistent. The permeability rate-strain curve is general hysteretic to stress-strain curve, indicating the close relativity between the evolvement of damage and the development of permeability rate. However, there is time interval between them and the perme- ability rate peaks value when the sample reaches the softened stage after the peak stress. Based on the characteristics of per- meability rate-strain curve, three stages were plotted out： the stage before minimum permeability rate （/co）, the stage between minimum and maximum of permeability rate and the stage after the maximum permeability rate （kmax）. According to the three stages of permeability rate, the segmental curve equations of permeability rate-strain were fitted： the first stage can be fitted with negative exponential function; the second stage can be fitted with Boltzmann equation; and the last stage can be fitted with multinomial equation.

关 键 词：PERMEABILITY quasi-plane strain coal-gas coupling test system STRESS-STRAIN 

分 类 号：O412.1[理学—理论物理] TU432[理学—物理]