摘要
为解决综采工作面预掘回撤通道贯通及设备回撤期间大变形失稳问题,建立渐变煤柱承载力模型,引入Weibull分布函数对煤柱上方增量载荷进行高度拟合,并基于修正的SMP准则理论计算得出渐变煤柱临界失稳宽度为10.5 m。基于基本顶断裂位置与回撤通道围岩稳定相互关系,确定基本顶合理跨度,分析揭示回撤通道围岩的失稳机理,并利用UDEC数值计算模型对回撤通道围岩响应特征进行模拟验证,结果具有一致性。提出“水力压裂主控切顶+高水材料墩柱让压支护”主被动联控技术成功应用于棋盘井矿I030901工作面回撤通道围岩控制。监测结果表明:工作面贯通时,墩柱最大工作阻力为9382 kN,巷道顶板最大下沉量为198 mm,支架工作阻力整面最大平均值为4278 kN,保证了综采设备安全高效回撤。
Pre-driven longwall recovery room suffers excessive mining pressure and is vulnerable to roof instability.In this paper,a mechanical model of the fender coal pillar was established,the Weibull distribution function was introduced to fit the incremental load above the coal pillar with a high degree,and the critical instability width of the gradual coal pillar was 10.5 m calculated based on the modified SMP criterion.According to the relationship between the fracture position in the main roof and the stability of the recovery room,a desirable span of the main roof was determined,the instability mechanism of a recovery room was comprehensively analyzed,and the response characteristics of the recovery room were simulated and verified using the UDEC numerical calculation model,and the results were consistent.The active and passive joint control technology of"hydraulic fracturing main control roof and high-water material cribs support"were successfully employed to the recovery room in No.I030901 longwall face of Qipanjing coal mine.The monitoring results show that when the working face is connected,the maximum working resistance of the pier column is 9382 kN,the maximum subsidence of the roadway roof is 198 mm,and the maximum average working resistance of the support is 4278 kN,which ensures the safe and efficient recovery process of the fully mechanized mining equipment.
作者
闫帅
张栋
柏建彪
郭永红
YAN Shuai;ZHANG Dong;BAI Jianbiao;GUO Yonghong(Key Laboratory of Deep Coal Resource Mining,Ministry of Education,School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Institute of Mining Engineering and Geology,Xinjiang Institute of Engineering,Urumqi,Xinjiang 830091,China;Guoneng Mengxi Coal Chemical Co Ltd,Wuhai,Inner Mongolia 016062,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2023年第4期774-785,共12页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(U21A20107,52074239)
鄂尔多斯市科技计划项目(2022EEDSKJZDZX005)。
关键词
回撤通道
失稳机理
渐变煤柱
墩柱支护
水力压裂
recovery room
instability mechanism
fender pillar
crib support
hydraulic fracture
