摘要
为了解决大断面回撤通道传统支护工艺准备时间长、成本高等问题,基于顶板断裂位置分析,提出一种切顶卸压联合“桁架-锚索-支架”的回撤通道协同控制技术。研究表明:工作面基本顶断裂位置对回撤通道围岩受力具有重要影响,基本顶超前断裂,顶板断裂线位于回撤通道煤柱上方时,回撤通道支护最为困难。据此,首先采用水力压裂技术超前预裂工作面基本顶,限定顶板断裂线远离回撤通道,降低覆岩大结构影响,解除回撤通道的区域应力环境;其次,采取“桁架-锚索-支架”组合支护形式,保障回撤通道围岩小结构的稳定。该技术在葫芦素煤矿21103工作面回撤通道进行了工业性试验,相较常规支护技术,回撤通道协同控制技术成本低、支护效率高,巷道围岩变形量小,保障了工作面的快速回撤。
In order to solve the problems of long preparation time and high cost of traditional support technology of large section withdrawal channel,based on analysis of roof fracture location,a collaborative control technology of"truss-anchor cable-support"combined with roof cutting and pressure relief was proposed.The results show that the fracture location of the basic roof of the working face has an important influence on the force of surrounding rock in the withdrawal channel.When the basic roof breaks ahead and the fracture line of the roof is located above the coal pillar in the withdrawal channel,the support of the withdrawal channel is the most difficult.Therefore,firstly,hydraulic fracturing technology is used to advance the basic top of the working face to limit the fracture line of the roof away from the withdrawal channel,reduce the influence of large overburden structure,and relieve the regional stress environment of the withdrawal channel.Secondly,the combined support form of“truss-anchor cable-support”is adopted to ensure the stability of the small surrounding rock structure of the withdrawal passage.The industrial test of this technology is carried out in 21103 working face withdrawal channel of Hulusu Coal Mine.Compared with the conventional support technology,the collaborative control technology of withdrawal channel has low cost,high support efficiency and small deformation of roadway surrounding rock,ensuring the rapid pullback of the working face.
作者
翁明月
WENG Mingyue(Shanghai Datun Energy Co.,Ltd.,Xuzhou 221000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2022年第S02期136-142,共7页
Coal Science and Technology
基金
国家自然科学基金资助项目(52074261)
关键词
回撤通道
基本顶断裂
协同控制
切顶卸压
withdrawal channel
basic top fracture
cooperative control
top cutting pressure relief
