近距离采空区下特厚煤层综放工作面矿压规律
Strata Behavior Regularity of Fully Mechanized Top Coal Caving Mining Face of Extra-thick Coal Seam Under Close Goaf
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摘要: 为得到极近距离采空区下15 m以上特厚煤层综放工作面矿压规律,以中煤大同塔山煤矿3-5#煤层首采工作面为工程背景,通过微震监测和支架阻力实测,综合研究得到:受极近距离采空区的影响,工作面上覆岩层表现出“缓沉运动”的特点;工作面推进过程中的整体来压强度较小,支架来压步距离散性较大、规律性不强;工作面来压期间动载系数平均1.19~1.22,矿压表现为准静压特点,支架工作状态较稳定。Abstract: In order to obtain strata behavior regularity of fully mechanized top coal caving mining face in the extra-thick coal seam below 15 m in the very short-distance goaf, the first workface of 3-5# coal seam in China Coal Energy Datong Tashan Coal Mine is taken as the engineering background, and through the use of microseismic monitoring technology and hydraulic support working resistance monitoring technology, the study obtained the following results: under the influence of overlying coal seam mining, the overburden strata shows the characteristics of “slow movement”; the overall compressive strength is small during the mining process of the working face, and the periodic weighting distance of the support is greater and the regularity is not strong; the working face strata appears as quasi-static pressure, and the working condition of the support is relatively stable. The dynamic load factor of the support during the periodic weighting is 1.19 to 1.22. The results could provide reference for safe and efficient mining of fully mechanized caving mining face in ectra-thick seam under similar conditions.
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