废弃矿井采空区覆岩裂隙网络水气两相渗流特性研究
TD82; 在"双碳"目标实现与煤炭深化供给侧改革的大背景下,大量资源枯竭及产能落后的煤矿被逐步淘汰,我国废弃矿井的数量不断增加.覆岩裂隙对于采空区内流体的运移具有一定的控制作用,为了揭示废弃矿井长期闭坑过程中采空区覆岩裂隙网络内水气两相渗流规律,本文采用数字图像处理技术对物理相似模型覆岩裂隙网络进行了识别及提取,统计分析了纵向破断裂隙和层间离层裂隙的几何参数特征,建立了覆岩裂隙网络几何模型,采用两相流理论探究了覆岩裂隙网络内瓦斯上浮和离层水下渗的流动规律.研究结果表明:采空区覆岩裂隙整体呈现"梯形"状,纵向破断裂隙与层间离层裂隙纵横交错、互相贯通,两种...
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| Published in | 中国矿业 Vol. 33; no. 8; pp. 37 - 45 |
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| Main Authors | , , , , |
| Format | Magazine Article |
| Language | Chinese |
| Published |
太原理工大学安全与应急管理工程学院,山西 太原 030024%太原理工大学矿业工程学院,山西 太原 030024
01.08.2024
太原理工大学山西省煤矿智能装备工程研究中心,山西 太原 030024 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1004-4051 |
| DOI | 10.12075/j.issn.1004-4051.20240940 |
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| Abstract | TD82; 在"双碳"目标实现与煤炭深化供给侧改革的大背景下,大量资源枯竭及产能落后的煤矿被逐步淘汰,我国废弃矿井的数量不断增加.覆岩裂隙对于采空区内流体的运移具有一定的控制作用,为了揭示废弃矿井长期闭坑过程中采空区覆岩裂隙网络内水气两相渗流规律,本文采用数字图像处理技术对物理相似模型覆岩裂隙网络进行了识别及提取,统计分析了纵向破断裂隙和层间离层裂隙的几何参数特征,建立了覆岩裂隙网络几何模型,采用两相流理论探究了覆岩裂隙网络内瓦斯上浮和离层水下渗的流动规律.研究结果表明:采空区覆岩裂隙整体呈现"梯形"状,纵向破断裂隙与层间离层裂隙纵横交错、互相贯通,两种类型裂隙的开度、面积、周长均随频数的增加呈现指数递减的分布趋势,迹长呈对数正态分布、角度呈正态分布.数值模拟再现了采空区覆岩裂隙网络内进水、驱气、出水的过程,揭示了采空区两侧裂隙优势渗流通道的形成机理,由于渗流速度的非均衡性,导致高位层间离层裂隙存在瓦斯滞留区,裂隙两端被封堵、交叉点处存在偏流等现象.研究成果对于废弃矿井遗留资源二次开发利用具有一定的指导意义. |
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| AbstractList | TD82; 在"双碳"目标实现与煤炭深化供给侧改革的大背景下,大量资源枯竭及产能落后的煤矿被逐步淘汰,我国废弃矿井的数量不断增加.覆岩裂隙对于采空区内流体的运移具有一定的控制作用,为了揭示废弃矿井长期闭坑过程中采空区覆岩裂隙网络内水气两相渗流规律,本文采用数字图像处理技术对物理相似模型覆岩裂隙网络进行了识别及提取,统计分析了纵向破断裂隙和层间离层裂隙的几何参数特征,建立了覆岩裂隙网络几何模型,采用两相流理论探究了覆岩裂隙网络内瓦斯上浮和离层水下渗的流动规律.研究结果表明:采空区覆岩裂隙整体呈现"梯形"状,纵向破断裂隙与层间离层裂隙纵横交错、互相贯通,两种类型裂隙的开度、面积、周长均随频数的增加呈现指数递减的分布趋势,迹长呈对数正态分布、角度呈正态分布.数值模拟再现了采空区覆岩裂隙网络内进水、驱气、出水的过程,揭示了采空区两侧裂隙优势渗流通道的形成机理,由于渗流速度的非均衡性,导致高位层间离层裂隙存在瓦斯滞留区,裂隙两端被封堵、交叉点处存在偏流等现象.研究成果对于废弃矿井遗留资源二次开发利用具有一定的指导意义. |
| Abstract_FL | In the context of the realization of the"dual carbon"target and the deepening of the supply-side reform of coal,a large number of coal mines with depleted resources and backward production capacity have been gradually eliminated,and the number of abandoned mines in China has continued to increase.The fractures in the overlying rock have a certain control effect on the migration of fluids in the goaf.In order to reveal the two-phase seepage laws of water and gas in the fracture network in the overlying rock in the goaf during the long-term closure of the abandoned mine,this paper utilizes digital image processing technology to identify and extract the characteristics of physical similarity model overlying rock fracture network.The geometric parameter characteristics of longitudinal breakage fractures and interlayer separation fractures are statistically analyzed and identified.A geometric model of the overlying rock fracture network is established,and the two-phase flow theory is used to explore the flow law of the flow pattern of gas floating up and water seeping down from the separation layer in the overlying rock fracture network.The research results show that the overlying rock fractures in the goaf are in the shape of a"trapezoid"as a whole,and the longitudinal breakage fractures and interlayer separation fractures are crisscrossed and connected with each other.The opening,area,and perimeter of the two types of fractures all decrease exponentially with the increase in frequency.The distribution trend of the two types of cracks is logarithmic normal distribution in trace length and normal distribution in angle.Numerical simulation reproduces the process of water inflow,gas displacement and water discharge in overlying rock fracture network in the goaf,and reveals the formation mechanism of the dominant seepage channels in the fractures on both sides of the goaf.Due to the non-equilibrium seepage velocity,there are gas retention areas in high interlayer separation fractures,the two ends of the fractures are blocked,and there are deviations in flow at intersections.The research results have certain guiding significance for the secondary development and utilization of resources left behind in abandoned mines. |
| Author | 李春 高瑞 冯国瑞 金智新 张纯旺 |
| AuthorAffiliation | 太原理工大学山西省煤矿智能装备工程研究中心,山西 太原 030024;太原理工大学安全与应急管理工程学院,山西 太原 030024%太原理工大学矿业工程学院,山西 太原 030024 |
| AuthorAffiliation_xml | – name: 太原理工大学山西省煤矿智能装备工程研究中心,山西 太原 030024;太原理工大学安全与应急管理工程学院,山西 太原 030024%太原理工大学矿业工程学院,山西 太原 030024 |
| Author_FL | JIN Zhixin FENG Guorui GAO Rui ZHANG Chunwang LI Chun |
| Author_FL_xml | – sequence: 1 fullname: ZHANG Chunwang – sequence: 2 fullname: JIN Zhixin – sequence: 3 fullname: FENG Guorui – sequence: 4 fullname: GAO Rui – sequence: 5 fullname: LI Chun |
| Author_xml | – sequence: 1 fullname: 张纯旺 – sequence: 2 fullname: 金智新 – sequence: 3 fullname: 冯国瑞 – sequence: 4 fullname: 高瑞 – sequence: 5 fullname: 李春 |
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| DocumentTitle_FL | Study on the characteristics of water-gas two-phase seepage in the overlying rock fracture network of goaf in abandoned mines |
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| Keywords | overlying rock 覆岩 采空区 seepage characteristic fracture network 渗流特性 abandoned mine 废弃矿井 裂隙网络 goaf |
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| Title | 废弃矿井采空区覆岩裂隙网络水气两相渗流特性研究 |
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