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| 大断面瓦斯隧道不同开挖方式瓦斯运移规律研究 |
| Study on gas migration law of three-bench excavation in large section gas tunnel |
| 投稿时间：2023-11-23 修订日期：2023-11-23 |
| DOI： |
| 中文关键词: 公路隧道、煤系地层、开挖方式、瓦斯运移、流固耦合 |
| 英文关键词: highway tunnel; coal measure strata; excavation methods; gas migration; liquid-solid coupling |
| 基金项目:国家自然科学基金面上项目(52274198)；2022年度湖南省交通运输科技项目(202243) |
| 作者 | 单位 | 邮编 | | 王晨 | 湖南科技大学 资源环境与安全工程学院 | 411201 | | 李树清* | 湖南科技大学 资源环境与安全工程学院 | 411201 |
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| 中文摘要: |
| 为探究大断面瓦斯隧道开挖过程中的瓦斯运移规律,基于煤与瓦斯流固耦合理论模型,采用COMSOL Multiphysics数值软件进行模拟,研究三台阶法、二台阶法和全断面法三种不同开挖方式下煤层内瓦斯压力和流速随时间的变化规律。研究结果表明：采用三台阶法、二台阶法和全断面法开挖后,破坏了煤层瓦斯赋存条件,煤层内瓦斯压力呈现先下降后逐渐平衡,瓦斯流速呈现先上升、再下降、后稳定的过程；三台阶法和二台阶法开挖后,各台阶瓦斯压力和流速大小存在差异,但随时间的变化规律相同；全断面法开挖,掌子面上、中、下位置瓦斯压力和流速随时间的变化规律及大小基本一致；采用台阶法与全断面法开挖对掌子面不同位置瓦斯压力和流速影响不同,全断面法开挖后掌子面不同位置瓦斯压力和流速大小差别不大,而二台阶法和三台阶法开挖后各台阶掌子面瓦斯压力、流速大小差异明显。 |
| 英文摘要: |
| In order to investigate the gas migration law during the excavation process of large-section gas tunnels, based on the theory of coal and gas flow-solid coupling, the COMSOL Multiphysics numerical software was used for simulation. The study focused on the changes in gas pressure and flow velocity in the coal seam over time under three different excavation methods: three-step method, two-step method, and full-section method. The results show that after excavation using the three-step method, two-step method, and full-section method, the gas occurrence conditions in the coal seam are destroyed. The gas pressure in the coal seam initially decreases and then gradually stabilizes, while the gas flow velocity shows an initial increase, followed by a decrease and then stability. After excavation using the three-step method and two-step method, the gas pressure and flow velocity of each step differ in magnitude but show the same trend over time. For excavation using the full-section method, the changes in gas pressure and flow velocity at the upper, middle, and lower positions of the goaf are largely consistent in both trend and magnitude. The excavation methods of step and full-section have different effects on the gas pressure and flow velocity at different positions of the goaf. After excavation using the full-section method, the gas pressure and flow velocity at different positions of the goaf do not differ significantly, while after excavation using the two-step method and three-step method, significant differences in gas pressure and flow velocity among the steps of the goaf can be observed. |
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