UDEC下保护层开采裂隙演化及瓦斯渗流规律

Study of crack evolution and gas seepage law with lower protective layer mining based on UDEC

为了研究中远距离下保护层开采后的裂隙演化与瓦斯渗流规律,运用UDEC 4.0离散元数值模拟软件,以郭庄矿为研究对象对中远距离下保护层开采后的裂隙演化与瓦斯渗流规律进行了数值模拟研究,并进行了现场验证.模拟结果较好地再现了中远距离下保护层开采过程中上覆岩层裂隙的发育情况和发育程度,揭示了被保护层瓦斯压力和瓦斯流量的变化规律.现场结果表明,中远距离下保护层开采过后,瓦斯压力降低了0.5 MPa;瓦斯含量降低了5.25m3/t;透气性系数增加到了原来的600多倍.

In order to study the crack evolution and gas seepage law with a lower protective layer under a medium-long distance,a numerical simulation study on crack evolution and gas seepage law with a lower protective layer under a medium-long distance as the research object of the Guozhuang mine by using UDEC4.0 numerical simulation software of discrete elements.Field validation was carried on the results of numerical simulation.The development situation and degree of the overlying strata crack was well reproduced in the numerical simulation result during lower protective layer mining under a medium-long distance,and the gas pressure and gas flux protected regular variation of change regulation were obtained.The test results show that gas pressure was reduced by 0.5 MPa,gas content was reduced by 5.25 m3/t,and permeability coefficient increased to 600 times of the original.