煤与瓦斯突出的非连续变形分析(DDA)模拟

Simulation on coal and gas outburst with Discontinuous Deformation Analysis method

依据煤层裂隙分布规律和瓦斯运移特征,推导了瓦斯渗流量与瓦斯压力关系方程和瓦斯对煤体作用的瞬时平衡方程,并采用惯性阻尼与黏性阻尼联合方法求解,提高了计算精度,提出煤与瓦斯突出后稳定区的划分。运用改进的非连续变形分析(DDA)方法模拟了鹤壁煤电股份有限公司十煤矿煤巷掘进时一次煤与瓦斯突出过程。模拟结果与实际案例数据统计结论一致。

According to the distribution law of coal seam fracture and migration characteristics of gas,deduced a group of equations about gas pressure and gas seepage in coal seam,and coupled state equations about gas-coal instantaneous balance;adopted the Discontinuous Deformation Analysis（DDA） method model,used inertial damping algorithm and viscous damping algorithm in the different stages,and gave a proposal to judge the stable area when a coal and gas outburst happened. Simulated the coal and gas outburst process in Hebi coal mining area on 19 March,2003,the results have a good match with the statistical data.