The influence of different gas pressures on the propagation law 
of coal and gas outburst two-phase flow

CHENG Liang; XU Jiang; ZHOU Bin; PENG Shou-jian; YAN Fa-zhi; YANG Xiao-bo; YANG Wen-jian

doi:10.16285/j.rsm.2019.1811

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The influence of different gas pressures on the propagation law of coal and gas outburst two-phase flow

更新时间：2026-06-25

- The influence of different gas pressures on the propagation law of coal and gas outburst two-phase flow
- Vol. 41, Issue 8, Pages: 2619-2626(2020)
- 作者机构：
  
  重庆大学煤矿灾害动力学与控制国家重点实验室,重庆,400044
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.1811
  CLC： TD713
- Online First：17 October 2020，
  
  Published：2020
- 稿件说明：
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CHENG Liang, XU Jiang, ZHOU Bin, et al. The influence of different gas pressures on the propagation law of coal and gas outburst two-phase flow[J]. 2020, 41(8): 2619-2626.
DOI：

CHENG Liang, XU Jiang, ZHOU Bin, et al. The influence of different gas pressures on the propagation law of coal and gas outburst two-phase flow[J]. 2020, 41(8): 2619-2626. DOI： 10.16285/j.rsm.2019.1811.

摘要

为了进一步认识煤与瓦斯突出气-固两相流冲击致灾机制及其传播规律，利用自主研制的多场耦合煤矿动力灾害大型模拟试验系统，研究了不同瓦斯压力作用条件下突出气-固两相流的冲击力及其运动特征。研究结果表明：突出煤-瓦斯两相流运移过程中，巷道前端的峰值冲击力在20～50 kPa间小范围波动，冲击力大小与瓦斯压力无明显线性关系；巷道中部 3 944～4 944 mm范围内峰值冲击力陡增；巷道末端，即4 944 mm以后，峰值冲击力沿巷道呈震荡衰减的变化趋势，其平均衰减系数随瓦斯压力的增高而逐步降低。突出两相流的流型可分为悬浮流、分层流、沙丘流及栓流，煤层瓦斯压力越高，各流型体现的越明显；煤粉流运移过程中可划分为初期加速、中期衰减、后期二次加速等3个阶段；瓦斯压力条件主要影响煤粉流的运移速率以及步入二次加速阶段的运移距离；瓦斯压力越大，煤粉流运移速率越快，其到达二次加速阶段的距离越短。

Abstract

In order to further understand the mechanism to cause shock hazard of coal-gas outburst gas-solid two-phase flow and the propagation law of the two-phase flow

a self-developed large-scale multi-field coupling coal mine dynamic disaster simulation testing system is used to study the impact force and movement characteristics of the outburst gas-solid two-phase flow under different gas pressure conditions. The results show that during the process of outburst coal-gas two-phase flow

the peak impact force at the front end of the roadway fluctuates within a small range from 20 kPa to 50 kPa

and the impact force has no obvious linear relationship with the gas pressure. The peak impact force sharply increases in the range from 3 944 mm to 4 944 mm in the roadway. After 4 944 mm

the peak impact force shows a trend of oscillating attenuation along the roadway

and its average attenuation coefficient gradually decreases with the increase of gas pressure. The flow patterns of the outburst two-phase flow can be divided into suspended flow

stratified flow

dune flow and slug flow

and the higher the coal seam gas pressure is

the more obvious each flow pattern is reflected. The process of pulverized coal flow movement can be divided into three stages: initial acceleration

medium-term attenuation and late secondary acceleration. The gas pressure mainly affects the migration rate of pulverized coal flow and the migration distance into the second acceleration stage. The higher the gas pressure

the faster the migration rate of pulverized coal flow

and the shorter distance to reach the second acceleration stage.

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