大直径钻孔穿越保护煤柱损伤演化与采空区瓦斯抽采运移规律  

Damage evolution of large diameter borehole through protective coal pillar and law of gas extraction and transport in goaf

作　　者：石光 SHI Guang(CCTEG Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《矿业安全与环保》2025年第1期111-121,128,共12页Mining Safety & Environmental Protection

基　　金：国家自然科学基金面上项目(51774182);国家自然科学基金青年科学基金项目(51404138);中煤科工集团沈阳研究院创新引导项目(SYYD-21WS-002)。

摘　　要：通过在Abaqus软件中引入Concrete Damage Model屈服准则,探究了钻孔开挖与采动过程中的煤柱损伤状态。以平舒煤矿81117工作面为例,运用Fluent软件分析了采空区瓦斯流动状态及钻孔布置间距、钻孔数量、抽采排量对瓦斯治理效果的影响。结果表明,钻孔开挖过程中煤柱不会发生明显的损伤。在回采过程中,巷道顶板与钻孔围岩的高应力区存在连通趋势,应提前加大钻孔附近的巷道支护强度。当钻孔数目为4个时,最优的钻孔间距为30 m。钻孔间距的增加在提升瓦斯抽采范围的同时会降低抽采效率。但抽采钻孔的数量不宜大于4个,继续增加钻孔将导致施工成本与抽采效率不匹配。有效抽采排量的上限为30 m^(3)/min,最优抽采排量为20 m^(3)/min。采用大直径钻孔抽采技术后,上隅角CH 4体积分数由0.60%~1.05%降低至0.3%~0.8%,验证了该技术的可靠性。By introducing Concrete Damage Model yield criterion in Abaqus software,the damage state of coal pillar in the process of drilling and mining was investigated.Taking the 81117 working face of Pingshu Coal Mine as an example,Fluent software was used to analyze the influence of the gas flow state in goaf,the spacing of boreholes,the quantity of boreholes and the pumping capacity on the gas control effect.The results show that there is no obvious damage to coal pillar during drilling and excavation.In the process of coal winning,there is a tendency of communication between the roof of the roadway and the high stress area of the surrounding rock of the borehole,so the supporting strength of the roadway near the borehole should be strengthened in advance.When the number of boreholes is 4,the optimal hole spacing is 30 m.The increase of borehole spacing will reduce the efficiency of gas extraction while improving the extraction range.However,the quantity of extraction boreholes should not be more than 4,and continuing to increase the quantity of boreholes will lead to a mismatch between the construction cost and extraction efficiency.The upper limit of effective pumping capacity is 30 m^(3)/min,and the optimal pumping capacity is 20 m^(3)/min.Before the large-diameter drilling and extraction technology was adopted,the gas concentration in the upper corner was 0.60% to 1.05%,and after the adoption of this technology,it was reduced to 0.3% to 0.8%,which verified the reliability of the technology.

关 键 词：大直径钻孔 采空区 瓦斯治理 瓦斯抽采 数值模拟 煤柱损伤 

分 类 号：TD712[矿业工程—矿井通风与安全]