Study On Advanced Geological Prediction Technology In Gas Tunnel Construciton Of Danjingshan

With the rapid development of traffic cause in our country, the number of the gastunnel is increasing. In order to ensure the safe of the gas tunnel construction, it isparticularly important to detect the adverse geological conditions and gas occurrence infront of tunnel face by using advanced geological prediction technology.This article based on Danjing Second Tunnel of the eastern section of ChengduSecond Ring Expressway, summarizad the research status and forecast methods ofadvanced geological prediction technology at home and abroad, and established a set ofadvanced prediction program suitable for natural gas tunnel, which consists ofcomprehensive application of the geologic sketch on tunnel face, geological radardetection, advanced drilling exploration and gas detection in probing drift. According tothe program, the following aspects were carried out in this article:â‘ This article introduced the basic theory of geological radar detection andanalyzed the salient features of mostly intact rock mass, jointed-intensive rock mass,broken rock mass and water-rich rock mass, which showed in the color profile andoscillogram.â‘¡By summarizing the features of advanced drilling exploration, and combiningwith the application of this technology in Danjing Second Tunnel, this article illustratedthe basis of predicting geological conditions in front of the tunnel face by usingadvanced drilling exploration.â‘¢This article introduced the properties of gas and the classification standard ofgas tunnel, analyzed the features of the gas prediction in the natural gas tunnel, andstated the applications of gas detection in probing drift in Danjing Second Tunnel.This article comprehensively analyzed the forecast result of above-mentionedadvanced prediction methods by combining with the geological sketch on tunnel face,and compared the analytical result with the actual excavation of the tunnel, it turned outthat the forecast effect is better. This program can effectively guide the construction ofnatural gas tunnel, and provide a reference for the similar tunnel project in the future.