矸石整体置换“三下”煤柱后关键层移动与等价采高的关系及其移动特征  

Relations between the Key Stratum Movement and Equivalent Mining-height Induced by Coal-pillar Replaced By Gangue Backfill under Three Circumstances and Characteristics of Strata Movement

作　　者：余伟健[1,2] 王卫军[1,2] 

机构地区：[1]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201 [2]湖南科技大学能源与安全工程学院,湖南湘潭411201

出　　处：《矿冶工程》2011年第4期25-29,33,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金资助项目(51074071);湖南省教育厅资助项目(10C0665;09B035);湖南省科技厅科技计划项目(2010T4003-7);教育部科学技术研究重点项目(210147);湖南省高校科技创新团队支持计划资助项目

摘　　要：针对矸石整体置换"三下"煤柱引起的岩层移动问题,根据等价采高概念与关键层下沉特征,采用正交试验和FLAC软件对16个方案进行了方案设计和数值计算,得到了不同方案的岩层下沉及等价采高的计算结果,分析了多因素与等价采高和关键层下沉的关系,并拟合出各自的回归方程。根据数值计算结果,分析了单个因素对等价采高和岩层移动的影响,得到了不同条件下等价采高和顶板下沉的变化曲线。分析了不同关键层的计算参数所引起的岩层移动曲线与特征。结果表明,越靠近煤层、厚度越大、强度越高的关键层对于最大限度地控制岩层移动具有越重要的积极作用,而关键层的层位则为关键性因素;另外,采空区顶板下沉规律与关键层下沉规律并不相同。Aiming at the strata movement caused by coal-pillar under three circumstances replaced by gangue backfill,orthogonal experiment and software of FLAC were used in design and numerical calculation for sixteen schemes,four factors including the horizon,thickness,intensity of key stratum and compactness of gangue filling were considered based on the concept of equivalent mining-height and subsidence characteristics of key stratum.Relations between the key stratum and equivalent mining-height were analyzed,and their regression equations were fitted out.After analyzing effect of each factor on equivalent mining-height and strata movement according to the numerical calculation results,variation curves of equivalent mining-height and roof subsidence under various conditions were obtained.Curves and characteristics of strata movement were analyzed with different calculation parameters of key stratum.Results showed that key stratum with larger thickness and higher intensity,while being closer to coal seam,played an important role in maximally controlling strata movement,and the horizon of key stratum was the key factor.In addition,roof sinking didn′t follow the same rule of the subsidence of key stratum in mind-out area.

关 键 词：矸石充填 “三下”煤柱 关键层 等价采高 岩层移动 

分 类 号：TD322.4[矿业工程—矿井建设]