块段式开采区段煤柱突变失稳机理研究  

Research on catastrophe instability mechanism of section coal pillars in block mining

作　　者：曹胜根[1] 曹洋[1] 姜海军[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,矿业工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2014年第6期907-913,共7页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2015CB251600);国家自然科学基金项目(51374197;50774078);江苏高校优势学科建设工程项目;江苏省"青蓝工程"项目;煤炭资源与安全开采国家重点实验室自主课题项目(SKLCRSM12X06)

摘　　要：长壁开采后遗留了大量的不规则块段,回收这部分煤炭资源主要是通过以连续采煤机为主的短壁块段式开采。区段保护煤柱的稳定与否是不规则块段安全开采的关键。根据同煤集团某矿2-2上煤层的地质条件,运用突变理论分析了煤柱失稳机理,推导出区段煤柱发生突变失稳的必要条件为煤柱屈服区宽度大于煤柱总宽度的86%,数值模拟计算结果验证了该结论,并直观地模拟了煤柱与采场变形破坏的动态演化过程。通过在该矿区段煤柱的应用实施,煤柱不发生突变失稳的理论计算结果为其塑性区宽度不得大于12.9 m,现场钻孔窥视实测结果验证了该结论。A lot of residual coal pillars of irregular blocks coal resources were left after longwall mining. These coal resources are mainly exploited by the short-wall mechanized block mining technology, using continuous miner. Whether the section coal pillar is stable or not is the key to safety of irregular blocks coal mining. According to the geological production conditions of the 2-2 seam in Datong Coal Mine Group,catastrophe theory has been applied to analyze the catastrophe instability mechanism of section coal pillars. The essential condition for catastrophe instability of section coal pillars has been derived： when plastic zone width of coal pillar is more than 86%. The numerical simulation results will conform to the observations. The dynamic evolution process of failure in section coal pillars and stope has been simulated. Taking the section coal pillar in Datong Coal Mine as an example, the theoretical calculation results for catastrophe instability is that plastic zone width of coal pillar should be no more than 12.9 m, which is consistent with drilling peep experimental results.

关 键 词：块段式开采 区段煤柱 突变理论 煤柱稳定性 数值模拟 

分 类 号：TD315[矿业工程—矿井建设]