高瓦斯多煤层大采高工作面覆岩裂隙演化规律研究

发布时间：2018-05-14 02:20

本文选题：大采高工作面 + 覆岩　；参考：《中国矿业》2017年03期

【摘要】：高瓦斯多煤层矿井运用大采高技术以实现矿井高产高效,开采工艺不同导致工作面瓦斯涌出规律的变化。以沁水煤田15#煤层大采高工作面煤层赋存条件和覆岩分布特征为背景开展采动覆岩裂隙演化规律研究,运用UDEC数值模拟大采高工作面在不同推进距离时覆岩裂隙形态发育及位移量,并提出基于示踪原理的实测覆岩裂隙发育规律的验证方法。研究表明:大采高工作面推进至120m时,煤层上覆岩层裂隙极限发育高度为65m,大采高工作面上邻近层8#煤层处于采动卸压范围,示踪气体法现场测试数据验证了数值模拟的准确性。由于大采高工作面覆岩裂隙发育范围扩展至上邻近层8#煤层,所以工作面回采过程中应增加上邻近层瓦斯抽采工艺。
[Abstract]:Large mining height technique is used to realize high yield and high efficiency in high gas multi coal seam mine. Different mining techniques result in the change of gas emission law in working face. Based on the coal seam occurrence conditions and overburden distribution characteristics of the large mining face of No. 15 coal seam in Qinshui coalfield, the evolution law of mining overburden cracks is studied. In this paper, UDEC is used to simulate the formation and displacement of overburden cracks at different propulsive distances, and a method to verify the law of overburden fracture development based on tracer principle is put forward. The study shows that the limit height of fracture development of overlying strata is 65 m when the working face of large mining height is advanced to 120 m, and the coal seam near seam 8# on the face of large mining height is in the range of mining and unloading pressure. The accuracy of numerical simulation is verified by field test data of tracer gas method. Since the development range of overburden cracks in large mining face extends to the upper adjacent seam 8# coal seam, the gas drainage technology of upper adjacent strata should be increased in the mining process of working face.
【作者单位】：东北大学资源与土木工程学院;
【基金】：国家科技重大专项资助(编号:2016ZX05067) 辽宁省自然科学基金项目资助(编号:2013020137)
【分类号】：TD712

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