亭南煤矿204工作面卸压抽采合理范围研究

发布时间：2018-04-08 21:34

本文选题：覆岩运动　切入点：有效应力　出处：《辽宁工程技术大学》2013年硕士论文

【摘要】：随着煤炭开采深度和开采强度的增加,加之垮落法顶板管理措施的逐渐普及化,和煤炭产量增加的同时,瓦斯威胁程度也逐渐增大,为煤矿围岩控制以及高效安全生产带来严峻的考验。论文在国内外对覆岩体裂隙演化以及瓦斯抽采工程研究的基础上,依据煤矿开采学、矿山压力与岩层控制学、煤矿瓦斯防治理论,通过数值模拟仿真以及现场工业试验方法做如下研究：通过现场瓦斯基础参数测定和涌出量预测,分析了大采高工作面瓦斯来源及瓦斯治理的重点；结合前人大量的理论试验研究结果,对覆岩受采动影响应力与渗透关系研究得出,表征渗透特性大小的渗透率可以用垂向应力变化的指数函数表示,并通过试验测得了不同岩石渗透率与有效应力之间的规律；利用数值模拟,研究采动影响上覆岩层应力分布规律,利用实验得出的有效应力与渗透率之间的函数关系,得出上覆岩层渗透率分布与工作面推进距离之间的关系,划分卸压抽采合理范围；通过不同层位瓦斯抽采浓度进行比较表明抽采钻孔终孔落在高渗区内瓦斯抽采效果好,确定了卸压瓦斯抽采的合理层位。依据前面分析确定的卸压范围对瓦斯抽采优化,通过在亭南煤矿204工作面实施高位、中位卸压抽采孔结合其他抽采方法,减少了采空区及邻近层向工作面的瓦斯涌出量,有效控制了工作面和上隅角瓦斯超限,大大提高了瓦斯抽采率,为瓦斯利用提供了稳定高浓度瓦斯,从而得出适合此工程背景卸压瓦斯抽采的合理方案,实现煤与瓦斯安全高效共采。
[Abstract]:With the increase of coal mining depth and mining intensity, as well as the gradual popularization of roof management measures of caving method, and the increase of coal production, the degree of gas threat is also gradually increasing.For the coal mine surrounding rock control and efficient and safe production brings a severe test.On the basis of the research on the evolution of overlying rock mass fractures and gas drainage engineering at home and abroad, the paper bases on the theory of coal mining, mine pressure and strata control, coal mine gas prevention and control.Through the numerical simulation and the field industrial test method, the following research is done: through the field gas foundation parameter determination and the emission quantity forecast, analyzes the gas source and the gas control key point of the large mining face;Combined with a large number of previous theoretical experimental results, the relationship between the stress and permeability of overburden affected by mining movement is studied. It is concluded that the permeability characterizing the permeability characteristic can be expressed by the exponential function of the variation of vertical stress.The law between permeability and effective stress of different rock was measured by experiment, and the stress distribution law of overlying strata affected by mining movement was studied by numerical simulation, and the functional relationship between effective stress and permeability was obtained by experiments.The relationship between the permeability distribution of overlying strata and the working face advance distance is obtained, and the reasonable range of pressure relief extraction is divided, and the comparison of gas extraction concentration in different strata shows that the final hole of drainage borehole falls in the high permeability area, and the gas drainage effect is good.The reasonable level of gas drainage is determined.According to the pressure relief range determined by the previous analysis, the gas drainage is optimized. The gas emission from goaf and adjacent strata to the working face can be reduced by implementing the high position in the 204 face of Tingnan Coal Mine and combining the medium pressure relief hole with other extraction methods.The gas overrun in the working face and the upper corner is effectively controlled, the gas drainage rate is greatly improved, and the stable and high concentration gas is provided for the gas utilization, and a reasonable scheme suitable for the pressure relief gas extraction in this engineering background is obtained.Coal and gas safe and efficient mining.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.6

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