Abstract
The Zipingpu tunnel is a high gas tunnel, located in the expressway section of national highway 317 from Dujiangyan to Wenchuan in Sichuan province. During its construction, gas explosion occurred many times, including a serious explosion. On the basis of summarizing the existing gas tunnel construction experiences, the Zipingpu tunnel adopted a “double insurance” scheme, which combined automatic monitoring with manual test to build a real-time and continuous gas concentration monitoring system in the tunnel. By analyzing a large number of monitoring data, it is concluded that the main factors which affect the gas concentration are tunneling blasting, ventilation condition and geological structure. Furthermore, the classification and prediction model of gas monitoring data are proposed. The predicted results obtained from the model are consistent with the measured data. This work can provide reference for other gas tunnel projects.
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