沿空留巷切顶卸压关键技术参数研究及应用  

Research and application of key technical parameters of pressure relief for top cutting along gob retaining lane

作　　者：韩飞飞 HAN Feifei(Shanxi Huobao Qianhe coal mine Co.,LTD,Linfen 041600,China)

机构地区：[1]山西霍宝干河煤矿有限公司,山西临汾041600

出　　处：《煤矿现代化》2024年第6期130-133,138,共5页Coal Mine Modernization

摘　　要：针对层状顶板碎胀系数不确定性问题,通过综合考虑碎胀系数、巷道围岩允许变形量、恒阻锚索长度、切顶预裂深度四者之间相互关系,以2-3 062巷顶板碎胀系数为研究对象,制定了分段试验方案,并进行井下现场试验与矿压监测,综合分析矿压数据表明:碎胀系数取1.31时,装药系数取300g/m时,恒阻锚索长度15.3 m施工难易程度适中,切顶预裂卸压效果明显,留巷稳定时断面达原断面82.5%,满足复用作为胶带输送机巷尺寸要求,避免了返修工程。In response to the uncertainty of the coefficient of fragmentation and expansion of layered roof,by comprehensively considering the interrelationships between the coefficient of fragmentation and expansion,the allowable deformation of tunnel surrounding rock,the length of constant resistance anchor cable,and the depth of pre splitting of the cut roof,a segmented test plan was developed for the coefficient of fragmentation and expansion of the roof of 2-3002 tunnel as the research object.Underground on-site tests and mine pressure monitoring were conducted,and comprehensive analysis of the mine pressure data showed that when the coefficient of fragmentation and expansion was set at 1.31 and the charging coefficient was set at 300g/m,The construction difficulty of the constant resistance anchor cable with a length of 15.3m is moderate,and the pre cracking and pressure relief effect of the top cutting is obvious.When the reserved roadway is stable,the cross-section reaches 82.5%of the original cross-section,meeting the requirements for reuse as a belt conveyor roadway size,avoiding repair engineering.

关 键 词：沿空留巷 切顶卸压 装药系数 碎胀系数 

分 类 号：TD327.2[矿业工程—矿井建设]