为进一步认识煤与瓦斯突出后巷道内突出流体的运移传播规律以及突出灾害的防灾减灾机制，以大型物理模拟试验为主，研究了突出流体运动、煤粉堆积、冲击波阵面传播、静压和温度等多物理参数的动态响应特征，建立了突出流体运移模型，并着重分析了突出流体在弧形直角拐弯巷道的运移规律。结果表明：突出煤粉在巷道内堆积呈现出两头多中间少的分布特征，多数煤粉集中分布于拐弯后巷道；冲击波阵面的传播速度呈先增大后减小再增大的演化趋势，气流速度快于煤-瓦斯两相流运移速度；巷道静压在单相气流阶段动态响应大，在煤-瓦斯两相流阶段骤降；空气压缩气流、瓦斯气流和煤-瓦斯两相流对静压的演化有着不同影响；在拐弯巷道运移过程中，空气压缩气流内有压缩波叠加现象使得波阵面传播速度加快以及静压升高，瓦斯气流和煤-瓦斯两相流受能量损失影响使得静压降低；巷道温度呈现出迅速下降后缓慢回升的趋势；近突出口区域温度受压缩做功影响，呈现先增大后下降的趋势；巷道内温度呈波动式上升分布状态，部分区域存在一个阻碍巷道温度降低的机制；弧形拐弯后形成一个低温气体聚集区，使得其温度下降量较大。

In order to further understand the migration and propagation law of outburst fluid in the roadway after coal and gas outburst, and the prevention and mitigation mechanism of outburst disasters, large-scale physical simulation experiments are mainly used to study dynamic response characteristics of multiple physical parameters such as outburst fluid movement, coal dust accumulation, shock wave front propagation, and static pressure and temperature, the prominent fluid migration model was established, and the migration law of the prominent fluid in the arc right-angle turning roadway was analyzed. The results show that the outburst pulverized coal accumulation in the roadway presents the distribution characteristics of more than one at the two ends and less in the middle, and most of the pulverized coal is concentrated in the roadway after turning; the propagation velocity of the shock wave front first increases, then decreases. The air flow speed is faster than the coal-gas two-phase flow; the static pressure of the roadway responds greatly in the single-phase air flow stage and it drops sharply in the coal-gas two-phase flow stage;compressed air flow, gas flow and coal-gas two-phase flow have different effects on the evolution of static pressure; during the movement of the turning roadway, the superposition of compression waves in the compressed air flow makes the wave front propagation speed faster and the static pressure rises. The gas flow and the coal-gas two-phase flow are affected by the energy loss and the static pressure decreases; the temperature of the roadway shows a trend of rapid decline first and then slowly rises; the temperature of the area near the outburst is affected by the compression work, showing a trend of first increasing and then decreasing; the temperature in the roadway shows a fluctuating rise and distribution state, in some areas there is a mechanism that hinders the temperature reduction of the roadway in the area; a low-temperature gas accumulation area is formed after the arc-shaped turn, which makes the temperature drop relatively large.

0 引言

1 试验方法

   1.1 试验系统

   1.2 试验方案

2 试验结果及分析

   2.1 突出流体运动特征及煤粉堆积

   2.2 静压响应特征

   2.3 温度响应特征

3 突出流体在弧形直角拐弯巷道的运移规律

   3.1 突出流体运移流动分析

   3.2 弧形直角拐弯处静压动态响应

   3.3 弧形直角拐弯处温度动态响应

4 结论