坪子上隧道瓦斯特征分析

隧道瓦斯突出风险是瓦斯隧道勘察的一个关键问题。针对坪子上瓦斯隧道勘察阶段与施工阶段对瓦斯特征测试的差异，从地层岩性、地质构造和煤层分布等方面对其差异性进行综合分析，得到以下结论:①隧道开挖后地层与勘察资料基本相符，勘察阶段对坪子上隧道瓦斯储藏特征进行的分析基本有效。②由于隧址区地质条件复杂，导致煤层推算位置与实际位置有差异。③瓦斯隧道施工过程中定期验证地质资料，实施动态施工，结合超前地质预报可有效规避隧道瓦斯突出风险。

Gas Characteristic Analysis for Pingzishang Tunnel

The risk of gas outburst in tunnel is a key problem in gas tunnel investigation. In view of the difference of gas characteristics during the investigation stage and construction stage of gas tunnel of Pingzishang, comprehensive analysis is made on the differences from formation lithology, geological structure and coal seam distribution. Get the following results:① After the tunnel excavation, the formation and survey data are basically the same and the analysis of the gas storage characteristics of Pingzishang tunnel is basically effective. ② Due to the complicated geological conditions of the tunnel site, the calculated position of the coal seam is different from the actual location.③ In the course of gas tunnel construction, the geological information is regularly verified and dynamic construction is carried out. Combined with the advanced geological prediction, the risk of gas outburst in the tunnel can be effectively avoided.