煤层顶板沉积环境对其稳定性影响研究  

Study on impact of sedimentary environment to stability of seam roof

作　　者：王海军 

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤炭科学技术》2017年第2期178-184,共7页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2011ZX05040-003);中煤科工集团西安研究院科技创新项目-青年基金资助项目(2013XAYQN002)

摘　　要：为了对煤层顶板稳定性做出合理的评价,以保障矿井安全高效开采,采用岩心描述、地层划分对比、系统采样、测试分析和测井技术以及顶板稳定性评价技术等综合方法,研究了麟游县LYL井田2号煤层顶板沉积环境及其对煤层顶板稳定性的影响。结果表明:煤层顶板经历了成煤前的河床沉积成煤过程中的河漫沼泽沉和成煤后的泛滥平原沉积环境的演化过程,主要发育泛滥平原微相,零星见决口扇、点砂坝。沉积环境影响煤层顶板稳定性,表现为泛滥平原顶板岩石稳定性差、点砂坝、决口扇稳定性中等。因此,在未来矿井生产过程加强对泛滥平原沉积环境顶板的维护和管理,选择合理有效的支护方式将是预防顶板离层水害的关键,同时注意点砂坝、决口扇形成的局部砂岩透镜体顶板的突水问题。In order to make rational evaluation on stability of seam roof and to guarantee safety and high efficient mining, core description, strata division and comparison, system sampling, measurement analysis, logging technology, roof stability evaluation technology and other comprehensive method were applied to study the sedimentary environment of No.2 seam roof in LYL Minefield of Linyou County and the sedimentary environment affected to the stability of the seam roof.The resuhs showed that the seam roof had an experience on river flood- plain swamp deposit during coal formation process of river bed deposit before the coal formation and on the evolution process of the flood plain sedimentary environment after the coal formation.The microfacies of the main developed flood plain had some crevasse-splay and point bar.The stability of the seam roof was affected by the sedimentary environment.The stability of the roof strata in the flood plain was poor and the stability of the point bar and crevasse-splay was medium.Therefore, in the future mine production process, the maintenance and management of the roof in the sedimentary environment of the flood plain should be enhanced and the rational selected and efficient support method was the key to control the water disaster from the bed separation of the roof. Meanwhile, the special attention should be giv- en to the water inrush problem from the roof with local sandstone lenticle formed by the point bar and crevasse-splay.

关 键 词：煤层顶板 沉积环境 顶板稳定性 顶板水害 

分 类 号：TD163[矿业工程—矿山地质测量]