鹞子岩瓦斯突出隧道揭煤工程防突设计

鹞子岩隧道于背斜核部、大断层附近连续六次穿过突出煤层,煤层厚度大、间距小,瓦斯压力大,兼有地下水影响,工程地质条件极其复杂,且为穿越中梁山脉的第一座瓦斯突出隧道,相关设计施工经验欠缺。本文以鹞子岩隧道为工程背景,本着"区域防突措施先行、局部防突措施补充"的指导思想,在充分探明煤层地质特征的基础上,系统制定了极复杂地质条件下瓦斯突出隧道揭煤防突的流程体系及工程措施。目前,该流程体系及工程措施已成功应用于指导鹞子岩隧道揭煤防突作业,可为类似地质条件的隧道揭煤防突作业提供指导,同时有助于拓展和完善瓦斯突出隧道揭煤防突设计的理念和方法,具有重要的工程实际意义。

Outburst Prevention Design of Coal Mining in YaoziyanTunnel with Gas Outburst

Yaoziyan Tunnel passes through outburst coal seams six times in succession near the anticline core and major faults,where the geological conditions are extremely complex for thick coal seams,short intervals,high-pressure gas and ground water.Moreover,because it is the first tunnel with gas outburst passing through Zhongliang Mountains,there is no sufficient experience in relevant design and construction.This paper takes Yaoziyan Tunnel as a case,logically formulates the system of procedure and engineering measures of coal mining and outburst prevention in tunnels with gas outburst under extremely complex geological conditions on the basis of fully studying the geological characteristics of coal seams,while adhering to the guideline of"regional outburst prevention measures shall be made first and local outburst prevention measures shall be taken as a supplement".This system is of important practical engineering significance,since it has been successfully applied to guiding the coal mining and outburst prevention for Yaoziyan Tunnel,and can provide guidance for the coal mining and outburst prevention of tunnels with similar geological conditions,and also help to expand and improve the concept and method of coal mining and outburst prevention design of tunnels with gas outburst.