摘要
基于浅埋煤层采空区岩体应力空间分布特征严重影响煤矿地下水库的稳定运营,选取神东矿区拟建地下水库22615面为研究背景,采用相似材料模型实验模拟浅埋煤层采空区覆岩运动规律;根据薄板挠度弯曲理论和Winkler弹性地基板原理,推导关键层下沉轨迹函数微分方程;结合岩石压实变形特性,进一步建立浅埋煤层采空区岩体应力空间分布数学模型,并开展实例应用和现场验证。研究结果表明:浅埋煤层采空区岩体应力分布与覆岩运动密切相关,裂隙带岩层以走向中心线为对称轴呈"∪"形沉降,对应垮落带岩体应力则表现为"∩"形变化;运用模型计算22615面采空区低应力区、应力恢复区和应力平稳区的走向长度为12.02,60.13,856.64m,倾向长度为4.21,21.08,300.37m,岩体应力为0,0~1.41,1.41MPa,与现场实测数据最大偏差为20%,较好地验证模型的准确性,为煤矿地下水库矿压控制及库容设计提供理论依据。
In response to the problem that spatial distribution characteristics of rock stress in shallow buried goaf seriously affects the stability of coal mine underground reservoir engineering, working face 22615 of the proposed coal mine underground reservoir in Shendong mining area has been selected as the study background to analyze overlying strata movement law of the shallow buried goaf through similar material model experiments. And subsidence trajectory function differential equation has been deduced based on the deflection and bending theory of thin plate and Winkler’s principle of elastic foundation plate. According to rock compaction deformation characteristics, the spatial distribution mathematics model of rock stress in shallow buried goaf has further been established, and then field application and verification have been carried out. The study results have shown that spatial distribution of rock stress in shallow buried goaf relates closely to the overlying strata movement. The stratum subsidence in fracture zone presents "∪"-shape settlement, with the strike center line as the symmetry axis, while the variation of rock stress distribution in caving zone performs "∩" shape. The mathematics model has been used to calculate rock stress distribution station in goaf of working face 22615. The strike lengths of low stress area, stress recovery area and stress stationary area are 12.02 m, 60.13 m and 856.64 m respectively. The corresponding dip lengths are 4.21 m, 21.08 m and 300.37 m, and rock stress is 0 MPa, 0~1.41 MPa and 1.41 MPa in turn, which has been compared with the measured data in the field, and the maximum deviation reaches 20%. It positively verifies the accuracy of the mathematics model, and provides a theoretical basis for underground pressure control and reservoir capacity design.
作者
汪北方
梁冰
张晶
迟海波
蒋嘉祺
WANG Beifang;LIANG Bing;ZHANG Jing;CHI Haibo;JIANG Jiaqi(School of Mines,Liaoning Technical University,Fuxin,Liaoning 123000,China;State Key Laboratory of Coal Resources and Safe Mining,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 100011,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;School of Science,Liaoning Technical University,Fuxin,Liaoning 123000,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1203-1212,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51704139)
煤炭资源与安全开采国家重点实验室开放研究基金项目(SKLCRSM18KF011)
煤炭开采水资源保护与利用国家重点实验室开放研究基金项目(SHJT-17-42.7)
关键词
浅埋煤层采空区
煤矿地下水库
覆岩运动
应力分区
数学模型
shallow buried goaf
coal mine underground reservoir
overlying strata movement
rock stress areas
mathematics model
