摘要
护巷窄煤柱的合理留设是综放沿空掘巷技术成功实施的关键问题。基于采空侧煤体倾向支承压力分布特征以及护巷煤柱体的极限平衡理论，确定了护巷窄煤柱合理留设宽度的上、下限值解析表达式，结合山东某矿3309综放工作面的采矿地质条件，认为护巷窄煤柱合理留设宽度范围为4．1-7．2m。为了进一步优化设计护巷窄煤柱的留设宽度，采用数值模拟方法对合理取值范围内的护巷窄煤柱留设宽度进行对比分析，认为3309综放工作面护巷窄煤柱的最优留设宽度为5m。将上述研究成果成功运用于工程实践，现场实测数据表明，结合理论分析和数值计算综合确定的护巷窄煤柱最优留设宽度可以有效控制沿空巷道围岩变形量，有利于维护综放沿空巷道的整体稳定性。
The width of the narrow coal pillar of roadway driving along goaf is the key factor affecting the surrounding stability of the mining roadway in fully mechanized top coal caving face. Based on the abutment pressure distribution characteristics and the ultimate balanced theory, the reasonable width of narrow coal pillar should be chosen between 4.1m and 7.2 m, combined with the engineering condition in workface 3309 of a mine in Shandong. In order to optimize the width of the narrow coal pillar, the effect of plastic area distributions and stress distribution characteristics of the two sides of coal pillar under conditions of different width of narrow coal pillar have been studied by numerical analysis. The optimal width of coal pillar is 5 m. The validity of the optimal coal pillar width was verified by the engineering practice in workface 3309. Field monitoring has indicated that the surrounding rock deformation of the mining roadway could meet the requirements of safety production.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第3期475-480,508,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51374201
51323004)
国家重点基础研究发展计划(973)项目(2013CB227900)
江苏省普通高校研究生科研创新计划项目(KYLX15_1407)
中国矿业大学大学生创新项目(201507)
关键词
综放沿空掘巷
护巷窄煤柱
极限平衡理论
围岩稳定性
roadway driving along goaf： narrow coal pillar： limit equilibrium theory： surrounding rockstability
