连续小煤柱开采条件下顶板活动及地表沉降规律研究

    Study on roof activity and surface subsidence law under the condition of continuous small coal pillar mining

    • 摘要: 以门克庆煤矿3104工作面、3106工作面及3107工作面为背景,综合微震监测与地表沉降监测研究发现,连续小煤柱开采大采空区顶板活动中,3107工作面回采初期顶板运动不扰动相邻覆岩;随着开采的推进,仅波及3104覆岩,3106覆岩无显著影响;微震事件由煤层顶板上方17.35 m细粒砂岩向30 m粉砂岩最终向48.05 m粗粒砂岩跃迁,呈高位岩层迁移趋势。地表沉降表明:最大沉降量集中于3107回风巷侧,沉降极值点由采区中部向3104采空区偏移,3106采空区中部沉降趋于稳定;走向监测线揭示最大下沉点向采空区偏移,证实3107采动诱发大采空区二次沉陷。

       

      Abstract: Taking the 3104, 3106 and 3107 working faces of Menkeqing Coal Mine as the background, the comprehensive microseism and surface subsidence monitoring research are found that in the roof activity of large goaf in continuous small coal pillar mining, the roof movement of 3107 working face does not disturb the adjacent overburden rock in the early stage of mining. With the advance of mining, only 3104 overburden rock is affected, and 3106 overburden rock has no significant effect. The microseismic event jumps from 17.35 m fine-grained sandstone above the coal seam roof to 30 m siltstone and finally to 48.05 m coarse-grained sandstone, showing a trend of high-level rock migration. The surface settlement shows that the maximum settlement is concentrated on the side of 3107 return airway, the extreme point of settlement is shifted from the middle of the mining area to the 3104 goaf, and the settlement in the middle of the 3106 goaf tends to be stable. The monitoring line reveals that the maximum subsidence point is shifted to the goaf, which confirms that 3107 mining induces the secondary subsidence of the large goaf.

       

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