| T型巷道中突出煤?瓦斯两相流动力学试验研究 |
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| 引用本文： | 许江,程亮,魏仁忠,彭守建,周斌,杨海林.T型巷道中突出煤?瓦斯两相流动力学试验研究[J].岩土力学,2022,43(6):1423-1433. |
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| 作者姓名： | 许江 程亮 魏仁忠 彭守建 周斌 杨海林 |
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| 作者单位： | 1. 重庆大学 煤矿灾害动力学与控制国家重点实验室，重庆 400044；2. 西安科技大学 安全科学与工程学院，陕西 西安 710054 |
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| 基金项目： | 国家自然科学基金面上项目（No.51874055,No.52074047）~~； |
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| 摘 要： | 为了进一步探究突出煤?瓦斯两相流在不同巷道布置方式下的动力学行为，利用多场耦合煤矿动力灾害大型物理模拟试验系统，开展了T型巷道布置方式下的煤与瓦斯突出试验，得出了两相流运移过程中冲击力与静压的演化特征。结果表明：直线主巷内冲击力随时间呈多峰值震荡衰减趋势，体现了突出过程的脉冲特性，且距突出口越近，冲击力震荡次数越多；分岔两侧支巷内冲击力突出前期呈现两种演化趋势，其一是迅速增大至峰值后缓慢下降，其二是缓慢增大后缓慢下降；距分岔结构中心左侧1 500 mm处出现了较大冲击力值，出现重度危险区域，而右侧则在距500 mm和1 900 mm处。利用突出运移动态图像将整个过程分为单相气流和两相流两个阶段，单相气流阶段中分岔后支巷的冲击力就迅速上升至峰值，而在两相流阶段分岔前主巷的冲击力上升至最高值，存在分岔后冲击力峰值高于分岔前的现象。突出过程中，巷道壁面上静压值总体偏低；静压随时间呈间歇式波动发展，且其峰值点自煤层由近及远呈先增大后减小的趋势；距突出口越远，直线主巷内静压出现峰值的时刻越滞后；分岔支巷内静压左右两侧的演化近似，随着时间推进，分岔结构前后静压衰减逐渐增大。
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| 关 键 词： | 煤与瓦斯突出 T型巷道 冲击力 静压 |
| 收稿时间： | 2021-07-23 |
| 修稿时间： | 2022-03-07 |
Propagation characteristics of coal-gas two-phase flow in T-shaped roadway |
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| XU Jiang,CHENG Liang,WEI Ren-zhong,PENG Shou-jian,ZHOU Bin,YANG Hai-lin.Propagation characteristics of coal-gas two-phase flow in T-shaped roadway[J].Rock and Soil Mechanics,2022,43(6):1423-1433. |
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| Authors: | XU Jiang CHENG Liang WEI Ren-zhong PENG Shou-jian ZHOU Bin YANG Hai-lin |
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| Institution: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
2. College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China |
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| Abstract: | In order to further explore the dynamic behaviors of outburst coal-gas two-phase flow under different roadway layouts, the self-developed multi-field coupled coal mine dynamic disaster large-scale simulation test system was used to carry out coal and gas outburst tests under the T-shaped roadway layout. The tests obtained the evolution law of impact force and static pressure during the migration of outburst coal-gas two-phase flow in the roadway. The results show that the impact force in the straight main roadway shows a trend of multi-peak oscillation and attenuation over time, reflecting the pulse characteristics of the outburst process. The closer to the outburst hole, the more impact force oscillation times. The impact force in the branch roads on both sides of the bifurcation has two evolutionary trends in the early stage. One is that it increases rapidly to the peak and then decreases slowly, and the other is that it increases slowly and then decreases slowly. Larger impact force values appear at 1 500 mm from the left side of the bifurcation structure and at 500 and 1 900 mm from the right side, indicating that these areas are severely dangerous. The whole process is divided into two stages of single-phase flow and two-phase flow by using the outburst motion image. In the single-phase flow stage, the impact force after the bifurcation structure firstly rises rapidly to the peak value. The impact force before the bifurcation structure rises to a peak point in the two-phase flow stage. There is a phenomenon that the peak value of the impact force after the bifurcation is higher than that before the bifurcation. During the outburst process, the static pressure value on the wall of the roadway is generally low. The static pressure fluctuates intermittently with time, and the peak value from near the coal seam to far first increases and then decreases. The time when the static pressure in the straight main roadway reaches the peak value is delayed with the increase of the distance from the outburst hole. The evolution of the static pressure on the left and right sides of the branch roadway is similar. As time progresses, the static pressure attenuation before and after the bifurcation structure gradually increases. |
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| Keywords: | coal and gas outburst T-shaped roadway impact force static pressure |
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