Zheng Xu, Ge Shaocheng, Liu Hongwei, Liu Jia, Yan Jingjing
College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, New South Wales 2500, Australia.
ACS Omega. 2024 Jan 12;9(3):3758-3771. doi: 10.1021/acsomega.3c07755. eCollection 2024 Jan 23.
Gob-side entry retained by cutting roof (GERCR) is a novel and widely used nonpillar mining technology, but the gas emissions from gob are large, and the gas migration characteristics change obviously, which easily leads to serious safety accidents such as gas explosions and personnel suffocation. The discrete element method-computational fluid dynamics (DEM-CFD) coupled model was proposed and used to study the gas flow field in gob under this technology. Through the calculation of this coupled model, the gas distribution and emission characteristics of gob under different ventilation modes of GERCR technology were clarified, and the areas where the gas exceeds the limit in the roadway were determined. To prevent and control gas accumulation, three-dimensional gas drainage technology in the GERCR working face was proposed based on the above research conclusions. Through the field application and monitoring, the characteristics of gas emission and the effect of gas drainage in the gob of GERCR technology were verified. The on-site monitoring results show that the DEM-CFD coupled model established above can simulate well the gas emission characteristics of the GERCR gob, and the three-dimensional drainage system can well control the gas accumulation in the roadway. The research results are of great significance to control gas disasters of this novel nonpillar mining technology.
沿空留巷切顶留巷开采（GERCR）是一种新型且广泛应用的无煤柱开采技术，但采空区瓦斯涌出量大，瓦斯运移特性变化明显，容易引发瓦斯爆炸、人员窒息等严重安全事故。提出了离散元法-计算流体动力学（DEM-CFD）耦合模型，并用于研究该技术下采空区瓦斯流场。通过该耦合模型计算，明确了GERCR技术不同通风方式下采空区瓦斯分布及涌出特征，确定了巷道内瓦斯超限区域。为防治瓦斯积聚，基于上述研究结论提出了GERCR工作面三维瓦斯抽采技术。通过现场应用与监测，验证了GERCR技术采空区瓦斯涌出特征及瓦斯抽采效果。现场监测结果表明，上述建立的DEM-CFD耦合模型能够较好地模拟GERCR采空区瓦斯涌出特征，三维抽采系统能够很好地控制巷道内瓦斯积聚。研究成果对于防治这种新型无煤柱开采技术的瓦斯灾害具有重要意义。
