摘要:
针对新提出的石门揭煤注液冻结防突方法,根据煤与瓦斯突出与煤层力学性能、煤层冻结温度之间的关系,结合人工冻结工程实践,采用岩石破裂过程分析RFPA2D系统,确定模型尺寸和边界条件,建立了石门揭露冻结煤层过程气固耦合数学模型。设定冻结温度下煤层的单轴抗压强度、弹性模量及瓦斯压力等相关参数,数值模拟了不同冻结温度下龙家山煤矿-400 m水平2#石门揭露6#煤层过程。数值模拟表明:当6#煤层温度降为-10～-20℃时,该石门揭煤工作面突出危险性将大为降低。综合冻结时间、能源消耗和防突效果,选定-10℃作为该石门揭露冻结煤层控制温度,可以提高突出矿井石门揭煤工程的经济效益。
Abstract:
Aiming at a new-presented outburst prevention method by injecting liquid and freezing in uncovering coal seam in cross cut,according to the relationship among the coal and gas outburst,the mechanical properties and coal seam freezing temperature,and combining with artificial freezing engineering practice,with the rock failure process analysis software-RFDA 2D,the paper determines the model sizes and boundary conditions and establishes gas and solid coupling mathematics model of uncovering frozen coal seam in cross-cut.Setting the interrelated parameters of gas pressure,uniaxial compressive strength and elastic modulus of coal seam under freezing temperature,the paper simulates the process of uncovering 6# freezing coal seam in 2# cross-cut of-400 levels in Longjiashan mine under the different freezing temperature.The simulation shows that when the temperature of 6# frozen coal seam drops to-15 ～-20℃,the gas outburst risk of the working face in 2# rock cross-cut will be greatly reduced.Integrating freezing time,energy consumption and outburst prevention effect,-10℃ is selected as the frozen seam control temperature of the working face,which can improve the economic benefits of coal uncovering in cross-cut project of the gas outburst mines.
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