山东国土资源2025，Vol.41Issue(7)：39-45,7.DOI:10.12128/j.issn.1672-6979.2025.07.006
老采空区条带煤柱失稳对地表建筑物的影响
Influence of Instability of Strip Coal Pillar in Old Goaf on Surface Buildings
摘要
Abstract
Under long—term groundwater immersion and high load conditions,strip coal pillars in the old goaf are easy to yield and peel off the coal walls on both sides.It will lead to partial instability of the coal pillars and affect surface buildings.Taking the old goaf formed by strip mining in a certain mining area as the engineering background,based on the AH Wilson coal pillar local yield theory,the yield zone of the coal pillar has been calculated.By using numerical simulation,characteristics of overlying rock damage,vertical stress distribution,and surface movement deformation before and after strip coal pillar instability.It is showed that after the instability of strip coal pillars,the overlying rock still experiences shear damage.The damage at the roof and floor of coal strata has been intensified,with an increased range of tensile fail-ure.The bearing stress of the strip coal pillar increases,and the stress concentration factor of the coal pil-lar at monitoring line 5 increases is 1.57～1.96.The further away from the coal seam,the smaller the difference in stress concentration factor compared to before the instability of the strip coal pillar.The stress distribution characteristics of the rock layer above 50m from the coal seam remain basically unchanged.The increase in surface subsidence value resulted in a maximum"activated"subsidence of 293 mm caused by coal pillar instability.Finally,based on numerical simulation results,the predicted parameters for sub-sidence before and after coal pillar stripping were inverted,and the maximum"activated"subsidence value of surface buildings was predicted to be 288 mm.It will provide references for the design of"three under-ground"coal mining and the protection of surface buildings.关键词
老采空区/条带开采/煤柱失稳/"活化"下沉/数值模拟Key words
Old goaf/strip mining/coal pillar instability/"activation"subsidence/numerical simulation分类
矿业与冶金引用本文复制引用
王君,王跃宗,王磊,郑国栋,董周宾,张浩,刘康,胡绍豪..老采空区条带煤柱失稳对地表建筑物的影响[J].山东国土资源,2025,41(7):39-45,7.基金项目
山东省重点研发计划:矿区土壤生态修复与大宗固废高值利用关键技术及工程示范(项目编码:2020CXGC011403) （项目编码:2020CXGC011403）
2023年济宁市重点研发计划项目:采煤塌陷地生态修复关键技术集成与示范(项目编码:2023HHCG003) （项目编码:2023HHCG003）
