褐煤露天矿端帮开采边坡支撑煤柱稳定性研究  

Stability of supporting coal pillar for slope highwall mined in lignite surface mine

作　　者：王东[1] 姜聚宇 韩新平[1] 南存全[1] 贺希格图 

机构地区：[1]辽宁工程技术大学矿业学院 [2]内蒙古霍林河露天煤业有限公司,内蒙古通辽028000

出　　处：《中国安全科学学报》2017年第12期62-67,共6页China Safety Science Journal

基　　金：国家自然科学基金重点资助(U1361211);国家自然科学基金资助(51474119)

摘　　要：为高效、安全回采露天矿开采后端帮大量压煤,综合采用理论分析、蠕变试验、数值模拟与工程实施等手段,研究端帮采煤机打硐回采条件下边坡支撑煤柱稳定性。以霍林河北矿西端帮为例,基于突变理论,推导支撑煤柱发生突变失稳的必要条件;基于支撑煤柱服务时间要求,提出目标时间强度的概念,确定支撑煤柱的3天目标时间强度参数;基于数值模拟,以煤柱拉伸剪切塑性区宽度为判据,确定合理煤柱宽度。结果表明:煤柱发生突变失稳的必要条件为煤柱塑性区宽度大于煤柱总宽度的88%;试验获得实例中煤柱的黏聚力c=0.93 MPa,内摩擦角φ=17.6°;确定合理煤柱宽度为4 m,经工程实践,验证了其合理性。In order to recover the coal under end slope after mining,theoretical analysis,creep test,numerical simulation and engineering practice are used to study the stability of supporting coal pillar under the condition that highwall machine recovers the coal by the way of holing. With west end slope of Huolinhe North Mine as the engineering background,the necessary condition for the instability of coal pillar is deduced based on mutation theory.The concept of target time strength is put forward based on the service time of supporting coal pillar,supporting coal pillar three days target time strength parameters are determined.Numerical simulation was applied to study coal pillar stability by calculating the range of tensile and shearing plastic zone,reasonable width of coal pillar is determined. Results show that the necessary condition for the instability of coal pillar is the width of the plastic zone is 88% of the coal pillar.Supporting coal cohesion is 0.93 MPa and friction is 17.6°. Reasonable width of coal pillar is determined to be 4 m,which is proved by engineering practice.

关 键 词：褐煤露天矿 端帮开采 突变理论 蠕变试验 目标时间强度 

分 类 号：X936[环境科学与工程—安全科学]