润宏煤业1305工作面静态膨胀剂致裂顶板卸压技术研究  

Research on pressure relief technology of roof cracking caused by static expansion agent in No.1305 working face of Runhong Coal Industry

作　　者：李亚飞[1] 李卫华 冯刚[1] Li Yafei;Li Weihua;Feng Gang(Zezhou Tian′an Runhong Coal Industry Co.,Ltd.,Shanxi Jinmei Group,Jincheng 048000,China)

机构地区：[1]山西晋煤集团泽州天安润宏煤业有限公司,山西晋城048000

出　　处：《能源与环保》2024年第6期280-286,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金资助项目(52174109)。

摘　　要：以润宏煤业1305工作面地质条件为工程背景,采用静态膨胀技术对运输巷顶板切顶卸压,避免煤柱侧应力集中。通过理论分析、实验室测试、现场工程试验等方法,分析和测试了静态膨胀剂的膨胀力性能,计算分析了静态膨胀剂作用下切顶卸压的钻孔参数,设计了详细的施工工艺。研究结果表明,静态膨胀剂的最大膨胀力可达到70 MPa,且持续时间长,完全可以用于煤岩致裂工程。钻孔间距、钻孔直径以及钻孔角度是影响静态膨胀剂致裂效果的主要参数。钻孔内产生的静态膨胀压力作用到孔壁,且能一直保持到顶板进入采空区后,在矿压、自重及静态膨胀力的作用下,顶板会出现裂缝、裂缝扩展、顶板致裂垮落3个过程。根据现场具体工程条件,在多组成排钻孔共同膨胀作用下,可形成膨胀应力的叠加,能够起到更好的致裂效果。研究为探索和推广煤矿非爆破式顶板致裂技术提供了借鉴。Based on the geological conditions of No.1305 working face in Runhong Coal Industry as the engineering background,static expansion technology for roof cutting and pressure relief in transportation roadways was adopted to avoid the lateral stress concentration on the coal pillar.By means of theoretical analysis,laboratory and field engineering test,the expansion force performance of static expansion agent was analyzed and tested,the drilling parameters of roof cutting and pressure relief under static expansion agent were calculated and analyzed,and the detailed construction technology was designed.The results show that the maximum expansion force of the static expansion agent can reach 70 MPa and the duration is long,which can be used in coal or rock fracturing engineering.Drilling spacing,drilling diameter and drilling angle are the main parameters that affect the fracturing effect of static expansion agent.The static expansion pressure produced in the drilling acts on the drilling wall and can be maintained until the roof enters the goaf.Under the action of mine pressure,weight and static expansion force,the roof would appear three processes,including cracks,crack expansion and roof cracking and collapse.According to the specific engineering conditions on-site,the superposition of expansion stress can be formed under the joint expansion action of multi-component row drilling,which can play a better fracturing effect.The research results provide reference for exploring and promoting non explosive roof fracturing technology in coal mines.

关 键 词：顶板致裂 静态膨胀剂 钻孔间排距 切顶卸压 

分 类 号：TD322[矿业工程—矿井建设]