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急倾斜特厚煤层高阶段综放工作面全周期覆岩运移规律

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急倾斜特厚煤层高阶段综放工作面水平分段开采随着开采深度加大冲击地压灾害形势愈加严峻,探究急倾斜特厚煤层群多工作面条件下的覆岩运移规律对于矿井安全高效开采至关重要.以乌东煤矿为工程背景,建立相似模型试验,采集模型表面位移数据,并采用Matlab绘制覆层位移云图,揭示了急倾斜特厚煤层高阶段综放工作面全周期覆岩运移规律,分析了工作面矿压与覆岩运移的联系.结果表明:(1)随着采深不断增加,覆岩垂直位移由上到下整体呈现形态由"N"形分布演化成"V"形分布,工作面开采伴随覆层破断、滑塌,形成"破断-滑塌-自充填"效应;(2)43#煤层工作面覆岩运移规律为煤层顶板垮落—直接顶垮落—老顶破断并呈现出铰接结构,45#煤层工作面覆岩运移规律为覆岩轻度垮落—上部岩层破坏严重—煤层间岩柱出现整体性垮断;(3)+550 m水平阶段开采之前,43#煤层中的支架压力普遍大于45#煤层,+525 m水平与+500 m水平开采后,45#煤层支架压力突增.
Study on the Laws of Whole-Cycle Overburden Rock Migration in High-Stage Fully-Mechanized Caving Face of Steeply Inclined Extra-Thick Coal Seam
With the increase of mining depth,the situation of rock burst disaster is becoming more and more serious in the high-stage fully-mechanized caving face of steeply inclined extra-thick coal seam.It is very important to explore the law of overburden movement under the condition of multi-working face of steeply inclined extra-thick coal seam group for safe and efficient mining.Taking Wudong Coal Mine as the engineering background,a three-dimensional physical model test was established.The similar model experiment was used to collect the surface displacement data of the model,and the Matlab was used to draw the overburden displacement cloud map.The laws of whole-cycle overburden movement in the high-stage fully-mechanized caving face of steeply inclined and extremely thick coal seam were revealed,and the relationship between mine pressure and overburden movement in the working face was analyzed.The results are concluded as follows.Firstly,with the increase of mining depth,the vertical displacement of overburden rock evolves from"N"shape distribution to"V"shape distribution from top to bottom.Working face mining is accompanied by overburden fracture and slump,forming a"fracture-slump-self-filling"effect.Secondly,the migration laws of overlying strata of working faces in 43# and 45# coal seam have been obtained,that are coal seam roof caving-direct roof caving-main roof breaking and showing hinged structure,as well as overlying strata slight caving-upper strata serious damage-inter-seam rock pillar overall collapse.Thirdly,before the mining at+550 m level,the support pressure in 43# coal seam is generally greater than that in 45# coal seam.After the mining at+525 m level and+500 m level,the support pressure in 45# coal seam increases sharply.

Steeply inclinedExtra-thick coal seamWhole cycleOverlying strata migrationMine pressure law

孙郡庆、曹中宗、王宏志、孙秉成、李柱

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国家能源集团新疆能源有限责任公司,新疆乌鲁木齐 830011

新疆大学地质与矿业工程学院,新疆乌鲁木齐 830017

阿克苏职业技术学院,新疆阿克苏市 843000

新疆大学矿产资源生态环境保护性开采自治区高校重点实验室,新疆乌鲁木齐 830017

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急倾斜 特厚煤层 全周期 覆岩运移 矿压规律

新疆维吾尔自治区杰出青年科学基金项目新疆维吾尔自治区"天山英才"培养计划项目新疆维吾尔自治区重点研发专项项目新疆维吾尔自治区重点研发专项项目2023年阿克苏地区科技兴阿项目

2022D01E312022TSYCCX00372022B010342022B01051202305

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(9)