残采孤岛工作面蠕变煤柱宽度数值研究  

Numerical Study on Creep Coal Pillar Width of Residual Island Working Face

作　　者：刘建伟[1] 宋选民[1] 张佳飞 王永佳[1] 

机构地区：[1]太原理工大学,太原030024

出　　处：《煤炭技术》2018年第3期46-49,共4页Coal Technology

基　　金：国家科技支撑计划项目(2007BAK29B02)

摘　　要：为确定孤岛工作面顺槽煤柱受采空区二次蠕变破坏影响后的合理宽度,通过理论分析计算蠕变煤柱宽度,数值模拟论证孤岛煤柱模型。研究表明:由计算知煤柱稳定宽度为5.4~6.3m,并经模拟论证宽度为6 m时,煤柱受采空区影响后能保持稳定。由数值分析确定5m煤柱破坏主要原因是高强应力下长时蠕变,弹性核区微破裂隙贯通,煤柱失稳;设计提出高强高预应力锚杆支护技术,支护后巷道煤柱侧位移量减小190.5%~407.27%。In order to determine the reasonable width of crossheading c, oal pillar influenced by residual mining ＇after the second time creep, the isolated coal pillar is proved by numerical simulation. The results show that the stability width of the pillar is from 5.4 m to 6.3 m, the width which is proved by the numerical simulation is 6 m, when the coal pillar is affected by the mined-out area can be stabilized. The main reason of 5 m coal pillar failure is long time creep, micro fracture link up in elastic core area, coal pillar may be instability, supporting roadway coal pillar side displacement reduced from 190.5% to 407.27% by designing of high strength and high prestressed bolt technology.

关 键 词：孤岛工作面 采空区 蠕变煤柱 

分 类 号：TD322[矿业工程—矿井建设]