首页|浅埋厚煤层连续采动下多关键层结构覆岩运移规律研究

浅埋厚煤层连续采动下多关键层结构覆岩运移规律研究

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以鄂尔多斯转龙湾煤矿23203工作面开采为工程背景,采用连续-非连续数值模拟和理论计算方法,对我国西北地区广泛分布的浅埋厚煤层连续采动下覆岩运移规律及矿压显现特征进行研究.结果表明:当埋深200 m、厚度4.81 m的浅埋煤层一次采全高连续快速开采时,其基载比Jz＞1且有3个关键层结构;连续采动作用下浅埋采场上覆岩层具有3种类型自稳结构,且各自稳结构的周期性破断相互影响,直接顶的第三次周期垮落形式存在"砌体梁"结构转化为"悬臂梁"结构的现象;多关键层结构工作面回采期间实测支架工作阻力值主要在11 000～16 500 kN之间,平均值为14 077.20 kN,验证了数值模拟、理论计算及支架选型的合理性.研究成果可为浅埋厚煤层安全开采和支架选型提供重要科学依据.
Study on Overburden Migration Law of Multiple Key Layers in Shallow-buried and Thick Coal Seam
Taking the mining of 23203 working face of Zhuanlongwan Coal Mine in Ordos as the engineering background,the continuous-discontinuous numerical simulation and theoretical calculation method were used to study the migration law of overburden and the characteristics of mine pressure behavior under continuous mining of shallow-buried and thick coal seams widely distributed in Northwest China.The results are concluded as follows.Firstly,when a shallow-buried coal seam with a depth of 200 m and a thickness of 4.81 m is mined continuously and rapidly at full height,its base-load ratio J z is greater than 1 and there are three key layer structures.Secondly,there are three types of self-stable structures in the overburden strata of shallow-buried stope under continuous mining,and the periodic fracture of each self-stable structure affects each other.The third periodic collapse form of the direct roof transforms the masonry beam structure into the cantilever beam structure.Thirdly,the measured working resistance value of support during the mining period of the multi-key layer structure working face is mainly between 11 000 kN and 16 500 kN,with an average value of 14 077.20 kN,which verifies the rationality of numerical simulation,theoretical calculation and support selection.The research results can provide important scientific basis for safe mining and support selection of shallow thick coal seam.

Shallow-buried and thick coal seamMulti-key layer structureOverburden migration lawContinuous-discontinuous numerical simulationWorking resistance of support

张奎奎、周辉、张树光、江飞飞、高阳

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桂林理工大学土木与建筑工程学院,广西桂林市 541004

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071

浅埋厚煤层 多关键层结构 覆岩运移规律 连续-非连续数值模拟 支架工作阻力

湖北省自然科学基金计划项目国家自然科学基金资助项目国家自然科学基金资助项目

2022CFB8605200912842077251

2024

矿业研究与开发
长沙矿山研究院有限责任公司 中国有色金属学会

矿业研究与开发

CSTPCD北大核心
影响因子：0.763
ISSN：1005-2763
年,卷(期)：2024.44(1)
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