首页|巨厚煤层下分层开采邻近采空区破断岩体分形继发性演化机理

巨厚煤层下分层开采邻近采空区破断岩体分形继发性演化机理

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为掌握新疆巨厚煤层开采扰动邻近采空区破断岩体分形继发性演化机理,以新疆某高瓦斯矿井巨厚煤层工作面为试验原型,利用大型二维物理相似模拟试验平台,开展巨厚煤层开采扰动邻近采空区破断岩体分形继发性演化机理试验,并结合分形理论定量表征邻近采空区破断岩体裂隙分布特征.试验结果表明:二次扰动邻近采空区破断岩体分形维数演化规律,随着下分层工作面推进,上覆采空区原有稳定结构被再次激活,岩体中铰接结构向下部破断岩体传递,使得邻近采空区岩层破断裂隙更为复杂,而后原激活区域逐渐稳定,形成新的趋于稳定的岩体结构,邻近采空区破断岩体产生继发性演化;得到邻近采空区破断岩体分形维数继发性演化机理,基于工作面推进过程中不同时期、不同区域邻近采空区破断岩体分形维数的继发性演化特征,随工作面推进,邻近采空区破断岩体周期性循环"激活—构建—稳定";将邻近采空区破断岩体划分为3区,即:分形维数继发性演化激活区、分形维数继发性演化构建区、分形维数继发性演化稳定区,研究结果将进一步为巨厚煤层瓦斯抽采钻孔布置参数的优化提供一定的理论指导.
Fractal secondary evolution mechanism of fractured rock mass in adjacent goaf areas under extremely thick coal seam lower slice mining
To master the mechanism of fractal secondary evolution of fractured rock mass in ad-jacent goaf areas disturbed by mining in Xinjiang's extremely thick coal seams,an experiment was conducted using a large-scale two-dimensional physical similarity simulation platform,taking a high-gas mine in Xinjiang with a extremely thick coal seam working face as the experi-mental prototype.The experiment aimed to explore the fractal secondary evolution mechanism of the fractured rock mass in adjacent goaf areas under mining disturbance.Combined with fractal theory,the fracture distribution characteristics of the fractured rock mass in the adjacent goaf areas were quantitatively characterized.The experimental results show that as the sublevel working face progresses,the original stable structure of the overlying goaf is reactiva-ted.The hinge structures within the rock mass are transmitted to the lower part of the frac-tured rock mass,complicating the fracture cracks in the adjacent goaf areas.Subsequently,the initially activated area gradually stabilizes,forming a new,more stable rock mass structure.This leads to the secondary evolution of the fractured rock mass in the adjacent goaf areas;Un-derstanding the fractal dimension secondary evolution mechanism of fractured rock masses in adjacent goaf areas,based on the characteristics of secondary evolution of the fractured rock mass fractal dimensions during different periods and regions as the working face progresses,shows that the fractured rock masses in adjacent goaf areas undergo a cyclical pattern of"acti-vation-construction-stabilization"with the advancement of the working face.The fractured rock mass in adjacent goaf areas is divided laterally into three zones:the activation zone of sec-ondary evolution of fractal dimension,the construction zone of secondary evolution of fractal dimension,and the stabilization zone of secondary evolution of fractal dimension.These find-ings provide theoretical guidance for optimizing the layout parameters of gas drainage boreholes in extremely thick coal seams.

extremely thick coal seamsecondary evolutionfractal characteristicslower slice miningadjacent goaf

赵鹏翔、裴文博、李树刚、贾永勇、林海飞、任新鹏、杨俊生

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西安科技大学安全科学与工程学院,陕西西安 710054

西部矿井瓦斯智能抽采工程研究中心,陕西西安 710054

新疆工程学院新疆煤炭资源绿色开采教育部重点实验室,新疆乌鲁木齐 830023

新疆工程学院新疆煤矿灾害智能防控与应急重点实验室,新疆乌鲁木齐 830023

新疆维吾尔自治区煤炭科学研究院新疆煤及煤层气工程技术研究中心,新疆乌鲁木齐 830091

新疆昌吉市菏泽腾达矿业有限责任公司菏泽腾达煤矿,新疆昌吉 831100

兖矿新疆矿业有限公司硫磺沟煤矿,新疆昌吉 831100

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巨厚煤层 继发性演化 分形特征 分层开采 邻近采空区

国家自然科学基金项目陕西省杰出青年科学基金项目国家重点研发专项项目陕西省教育厅重点项目新疆维吾尔自治区重点研发任务专项项目新疆煤炭资源绿色开采教育部重点实验室开放课题项目

520742172023-JC-JQ-402023YFC300900422JY0402022B01034-3KLXGY-KA2404

2024

10.13247/j.cnki.jcumt.20240068

中国矿业大学学报
中国矿业大学

中国矿业大学学报

CSTPCD北大核心
影响因子：1.83
ISSN：1000-1964
年,卷(期)：2024.53(4)
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