摘要
为解决神华蒙西矿区单翼开采矿井采掘接替紧张的难题,采用现场观测和数值计算的方法对迎采动工作面沿空掘巷上覆岩层运动和围岩变形的时空效应进行研究,得出迎采动阶段巷道围岩变形量与采掘工作面之间的距离呈逻辑斯蒂函数关系,沿空掘巷阶段巷道围岩变形量与巷道掘进距离呈指数函数关系。在此基础上,确定并调整了各段巷道的掘进时机和支护参数,提出了"高阻支护、动态监测、分段控制、固结煤帮、稳控顶板"的动态分段控制原理和"分段锚网索梁联合强力支护,重点时段窄煤柱注浆加固、单体支柱π钢梁加强支护顶板"的动态分段控制技术。现场实践表明,巷道顶底板和两帮变形量均小于900 mm,有效控制了迎采动工作面沿空掘巷的变形破坏。
In order to solve the difficult problems of mining and excavation replacing tension in single wing mining mine of Shenhua Mengxi Mining Area ,the site observation and numerical calculation method were applied to the study on the space-time effect of the overburden strata movement and the surrounding rock deformation in the gateway driving along the goaf forward to the coal mining face.The logistic functional relationship between the roadway surrounding rock deformation and the distance of exstracting coal face at the heading adajacent advancing coal face stage, the exponential functional relationship between the roadway surrounding rock deformation and the distance of ex- cavation roadway at the roadway driven along next gob stage were revealed. Based on the circumstances, the driving time and support param- eters of each section gateway were determined and adjusted.A dynamic section control principle of high resistance support, dynamic monito- ring and measuring, section control, coal sidewall consolidation and roof stable control and the dynamic section control technology of section bolt/steel mesh/anchor/beam combined powerful support, a narrow coal pillar grouting reinforcement at the key section, single prop and π steel beam enforced support roof were provided.The site practices showed that the deformation of the gateway roof and floor as well as the two sidewalls were all less than 900 mm and the deformation failure of the gateway driving along goaf forward to coal mining face was effectively controlled.
出处
《煤炭科学技术》
CAS
北大核心
2013年第7期43-46,50,共5页
Coal Science and Technology
基金
江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0954)
关键词
迎采动
沿空掘巷
动态分段控制
巷道变形
围岩控制
forward to mining
gateway driving along goaf
dynamic sectional control
deformation of gateway
surrounding rock control
