孤岛采空区瓦斯抽采效果数值模拟及实测研究

Numerical Simulation and Measurement Research on Isolated Goaf Gas Drainage Effect

针对宜兴矿1202孤岛面在回采过程中上隅角、回风巷瓦斯浓度易超限问题,采用数值模拟、工程实测相结合的研究方法。在采空区三维物理模型中,首次加入2个邻近孤岛采空区,并对高低位裂隙孔联合抽采技术下瓦斯抽采效果进行了模拟;分析并比较瓦斯浓度的现场实测值与模拟结果：运输巷高位裂隙孔平均瓦斯抽采浓度为9.87%,数值模拟结果为10%左右;运输巷、材料巷低位裂隙孔平均瓦斯抽采浓度分别为3.01%和2.91%,模拟结果为3%~5%左右;上隅角、回风巷平均瓦斯浓度分别为0.28%和0.19%,数值模拟结果分别为0.32%和0.25%左右。数值模拟结果与工程实践实测数据较为吻合,说明通过模拟手段确定最佳抽采方案的科学性与合理性。

Aiming at the problem of gas concentration overrun at upper corner and ventilation roadway of 1202 isolated working face during the process of mining,we adopt some research ways like numerical simulation and engineering practice. In the 3D- goaf physical model,we first time add two isolated working faces in it and simulate gas control effect by high- low position united draining technology. We analyze and compare measured value and simulation result of gas concentration： the average gas concentration measured value of transportation roadway high position fissure hole is 9. 87%,and the simulation value is about 10%. The average gas concentration measured value of transportation roadway and material roadway low position fissure hole is 3. 01% and 2. 91% separately,and the simulation value is about from 3% to 5%; the average gas concentration measured value of upper corner and ventilation roadway is0. 28% and 0. 19% separately,and the simulation value is 0. 32% and 0. 25% separately. The numerical simulation value is consistent with the engineering practice measured value,and the result shows the scientificity and rationality of extraction scheme by simulation way.