瓦斯隧道有害气体运移规律及通风方案优化研究

本文基于现场测试和数值模拟对隧道整体双洞互补式通风条件下瓦斯扩散规律进行分析和研究。结果表明:(1)瓦斯隧道爆破施工主要产物浓度峰值从掌子面向隧道洞口方向逐渐减小。(2)风速变化梯度随风管附壁程度的增加、距工作面距离的降低而显著提升;另外,局部压力损失会随着风管管口距工作面距离的缩小而增大。(3)在隧道掌子面附近区域瓦斯浓度变化最为显著,且射流区瓦斯浓度相较于回流区要低。本文研究成果可为瓦斯隧道施工通风优化提供参考。

Research on the Transport Law of Harmful Gases and the Optimization of Ventilation Scheme in Gas Tunnel

This paper analyzed and studied the gas dispersion law under the twin-tube complementary ventilation based on field tests and numerical simulations.The results show that:(1)the peak concentration of the main products of gas tunnel blasting construction decreased gradually from the tunnel face towards the tunnel entrance.(2)The gradient of wind velocity variation increased significantly with the increase of duct attachment degree and the decrease of distance from the working face.In addition,the local pressure loss increased as the distance between the duct opening and the working face decreased.(3)The gas concentration changed most significantly in the area near the tunnel face,and the gas concentration was lower in the jet area than in the return area.The results of this paper provide a reference for the ventilation optimization method of gas tunnel construction.