摘要
大煤柱内沿空掘巷是基于工作面双U型巷道布置方式提出的一种新技术,本文针对其具体生产地质条件,运用极限平衡理论、数值分析和现场实践相结合的方法,得出大煤柱内沿空掘巷窄煤柱合理宽度的确定方法,即从上区段采空区侧向支承应力分布规律和煤柱应力分布、巷道围岩应力分布、巷道围岩塑性区分布、巷道围岩变形与煤柱宽度的关系及窄煤柱宽度的极限平衡理论计算6个方面综合考虑窄煤柱的宽度,最终确定窄煤柱宽度为5 m,并深度分析了本区段工作面回采对窄煤柱和宽煤柱围岩应力分布规律的影响。
Gob entry driving in the large pillar is a new technology based on double U-shaped roadway layout of the face. According to the geological conditions, certain method of reasonable width of narrow pillar in gob entry driving in the large pillar is obtained based on the combination of limit equilibrium theory, numerical calculation and field practice. It takes into account six parameters for the narrow pillar width from distribution of stress of the section of the lateral support goaf, stress distribution of coal pillars, stress distribution of surrounding rock, plastic zone distribution of surrounding rock, the relation- ship between deformation of surrounding rock and pillar width and limit equilibrium theory of narrow pillar width, and finally it is determined that the narrow pillar width is five meters. Then deep analysis is conducted to the impact of stress distribution law between narrow pillar and wide pillar to this section face mining.
出处
《采矿与安全工程学报》
EI
北大核心
2014年第2期255-262,269,共9页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226801
2010CB226804)
国家自然科学基金项目(51174213)
新世纪优秀人才支持计划项目(NCET-10-0775)
中央高校基本科研业务专项资金项目(2009QM001)
关键词
大煤柱
窄煤柱
沿空掘巷
煤柱宽度
双U型
large pillar
narrow pillar
roadway in gob entry driving
pillar width
double U-shaped
