Huangyuchuan Coal Mine, CHN Energy Yili Energy Co. , Ltd.
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing

为探究黄玉川煤矿12407工作面浅埋高强度综采工作面覆岩破坏高度,选取工作面上方适当位置分别打设采前、采后两个地面钻孔,基于钻孔数据对其覆岩关键层及破坏高度进行理论分析与原位实测,综合考虑多指标因素进而确定覆岩破坏高度。通过钻井冲洗液消耗量及井下电视成像等现场实测方法,监测采前、采后钻孔钻进过程中特征参量变化过程,对覆岩破坏高度进行多指标综合评估,结果表明:12407工作面覆岩主要存在两层关键层,其中埋深88.7~116.5m位置处细粒砂岩为覆岩主关键层;12407工作面覆岩导水裂隙带发育高度距煤层底板约77m,与覆岩主关键层位置相近,主关键层对覆岩破坏高度产生抑制作用;对覆岩破坏高度多指标综合分析,可知在浅埋、高强度开采及厚硬基岩等多特殊条件叠加作用下,“两带”经验公式计算裂隙带高度在该工作面条件下适用性一般,综合确定12407工作面导水裂隙带发育高度以实测值77m为准。

In order to explore the overburden failure height of shallow-buried high intensity fully-mechanized mining face, No. 12407 working face of Huangyuchuan Coal Mine, two ground boreholes before and after mining are set up at the appropriate position above the working face. Based on the borehole data, the key strata and failure height of the overburden rock are theoretically analyzed and measured in situ, and the failure height of the overburden rock is determined based on multi-index factors. Through on-site measurement methods such as drilling flushing fluid consumption and underground video imaging, the change process of parameters in the process of before and after mining drilling is monitored, and the multi-index comprehensive evaluation of overburden failure height is carried out. The results show that there are two key strata in the overlying strata of No. 12407 working face, and the fine-grained sandstone at 88. 7~116. 5 m depth is the main key stratum of overlying strata. The development height of the water-conducting fracture zone of the overburden rock in No. 12407 working face is about m from the coal seam floor, which is close to the position of the main key stratum of the overburden rock, and the main key stratum has an inhibitory effect on the failure height of the overburden rock. Based on the comprehensive analysis of multiple indexes of overburden failure height, it can be seen that under the superposition of special conditions such as shallow burial depth, high- intensity mining and thick and hard bedrock, the applicability of the empirical formula of ‘two zones, collapse zone and water- conducting fracture zone’ to calculate the height of fracture zone in this working face is general, and the development height of water-conducting fracture zone in No. 12407 working face is comprehensively determined to be m based on the measured value.

任辰锋,孙彬,张红凯,等.浅埋高强度综采工作面覆岩破坏高度与实测研究[J].煤炭工程,2025,57(1):90-97.