基于瓦斯-氧气-温度多场耦合下以孔代巷的瓦斯抽采布孔间距研究

doi:10. 11799/ ce202512012

摘要/Abstract

摘要：

针对以孔代巷瓦斯抽采技术布孔间距现有确定方式仅依赖采空区瓦斯运移模拟与现场经验，缺乏多场耦合条件下的系统性综合分析，且未充分考量瓦斯之外其他致灾风险因素的问题，以2-105工作面为试验区，通过模拟与实测相结合的方法开展研究。首先模拟不同钻孔距离下采空区瓦斯运移规律，确定布孔间距基本区间；在此基础上，耦合分析采空区温度场、氧浓度场及风速场等因素，实现对布孔间距的综合优化；最后通过现场实测验证模拟结果。研究表明：单纯基于瓦斯场模拟得出的布孔间距为25m；而多场耦合分析显示, 间距增大将引发漏风增强、氧浓度上升，进而导致自燃带扩大及高温区迁移的灾害链，据此提出20m动态抽采策略。现场实测显示，钻孔距工作面15~35m区间内，上隅角瓦斯浓度均低于0.8%, 氧气浓度最大差值为0.9%，温度最大差值为0.8K，与模拟结果误差较小，验证了模拟的准确性。

关键词: 以孔代巷, 多场耦合, 布孔间距, 数值模拟

Abstract:

Abstract：Aiming at the problem that the existing method of determining the hole spacing of gas extraction technology only relies on the simulation of gas transportation in the airspace area and field experience, lacks systematic and comprehensive analysis under the condition of multi-field coupling, and fails to fully consider other disaster-causing risk factors in addition to gas, this study takes the working face of 2-105 as the experimental area, and carries out the research by combining the simulation with the actual test method. Firstly, we simulated the gas transportation law in the mining area under different drilling distances to determine the basic interval of hole spacing; on this basis, we coupled the analysis of the temperature field, oxygen concentration field and wind speed field in the mining area to optimize the hole spacing; finally, we verified the simulation results through on-site measurements. The study shows that the hole spacing based on the gas field simulation is 25m, while the multi-field coupling analysis shows that increasing the spacing will lead to the enhancement of air leakage and the increase of oxygen concentration, which will lead to the expansion of spontaneous combustion zone and the migration of the high temperature zone, and therefore, the 20m dynamic extraction strategy is proposed. On-site measurements show that the gas concentration in the upper corner is lower than 0.8% in the interval of 15-35m between the drill holes and the working face, the maximum difference in oxygen concentration is 0.9%, and the maximum difference in temperature is 0.8K, which is smaller than the simulation results, and verifies the accuracy of the simulation. This study improves the application system of the gas extraction technology under multi-field coupling conditions, and provides a scientific and accurate technical basis and decision-making reference for its optimization and the prevention and control of coal mine gas and fire disasters.

中图分类号:

TD712⁺.6

李润芝. 基于瓦斯-氧气-温度多场耦合下以孔代巷的瓦斯抽采布孔间距研究[J]. 煤炭工程, 2025, 57(12): 88-96.

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