王坡煤矿本煤层预抽钻孔布置方式优化研究与效果考察
Optimization Study and Effect Investigation of Pre-pumping Borehole Layout in Mining-coal Bed of Wangpo Coal Mine
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摘要: 为解决本煤层透气性差和预抽效果不理想问题，基于弹塑性力学理论，分析钻孔周围应力和塑性区分布及其影响因素，得到钻孔交叉布置并增加两钻孔交叉点数量，可增大钻孔网的孔周塑性区体积，增加抽采钻孔的有效长度，增加预抽煤层透气性，提高瓦斯抽采效率。通过王坡煤矿3207试验工作面分区域布置3种本煤层预抽方案及抽采效果考察，3种预抽钻孔布置方式中立体交叉钻孔抽采效率最高、衰减系数最小，是最佳本煤层预抽钻孔布置方式，后续推广应用中，有效解决现场抽-掘-采衔接紧张问题。Abstract: In order to solve the problem of poor permeability and pre-pumping effect in mining-coal bed, based on the theory of elastoplastic, the distribution of stress and plastic zone around the borehole and its influencing factors are analyzed, through the cross arrangement of drilling and increasing the number of two crossing points, it can increase the volume of the plastic zone around the borehole network, increase the effective length of the extraction borehole, increase the permeability of pre-extraction coal seam, and improve the efficiency of gas extraction. Three kinds of pre-extraction schemes and extraction effects of mining-coal bed are arranged in different regions at 3207 test working face of Wangpo Coal Mine. Among the three pre-extraction drilling arrangements, three-dimensional cross-drilling has the highest extraction efficiency and the smallest attenuation coefficient, which is the optimal arrangement of pre-extraction drilling in mining-coal bed. In the subsequent promotion and application, the tension between on-site extraction, excavation and mining can be effectively solved.
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