基于覆岩裂隙发育规律的高位钻孔合理布置研究

为了保证矿井安全高效回采，解决工作面上隅角瓦斯问题，以覆岩裂隙发育规律为研究基础，对采空区顶板高位钻孔的合理布置方式进行研究。并以申南凹煤矿20102综采工作面为研究背景，采用相似模拟、理论分析以及现场试验多种方法综合研究，利用相似模拟二维实验研究20102综采工作面回采期间覆岩裂隙发育规律，确定覆岩随工作面回采过程中压实区、裂隙区等分布变化规律。研究结果表明：在时间次序上覆岩裂隙随工作面回采经历横向裂隙发育、纵向裂隙发育、裂隙场扩张、裂隙重新压实的推进演化过程，其中裂隙扩张区为高位钻孔的合理布置位置，能够有效地提高钻孔抽采效率，高位钻孔的合理布置层位位于裂隙带距顶板30～50m范围内，能够合理地保证钻孔成孔率以及高效抽采效率，有效地降低上隅角瓦斯浓度(达到0.4%左右)，并且能够稳定保持。

Study on the reasonable arrangement of high position drilling holes based on the law of overlying rock fracture development

Abstract: In order to ensure the safe and efficient mining and solve the gas problem in the upper corner of the working face, based on the research of the development law of the overlying rock fracture, this paper studies the reasonable layout of the high-level borehole in the goaf roof. Taking the 20102 comprehensive mining face of shennanao coal mine as the research background, it uses the similar simulation, theoretical analysis and field test methods to study comprehensively, and uses the similar model Based on the research of fracture evolution field and so on, the distribution and change law of overburden with the compaction area and fracture area in the mining process of the working face are determined. The research results show that in the time sequence, the overburden fracture undergoes transverse fracture development, longitudinal fracture development, fracture field expansion with the mining of the working face In the process of fracture recompaction, the fracture expansion area is the reasonable location of high-level borehole, which can effectively improve the efficiency of borehole extraction. Therefore, this paper aims to find the dynamic fracture expansion area in the process of mining. Based on the dynamic expansion area obtained from this study, the author, based on the actual situation in the field, arranges multiple high-level borehole for gas extraction, and then studies the borehole Through the analysis of the extraction parameters, it is shown that the reasonable arrangement of the high-level boreholes is within the range of 30-50m from the roof of the fracture zone, which can reasonably ensure the hole forming rate and the high-efficiency extraction efficiency. Through the analysis of the extraction data, it can be seen that the arrangement of the extraction boreholes in this layer can effectively reduce the gas concentration in the upper corner (up to about 0.4%), and can be maintained stably.