提高地震区隧道超前地质预报准确性的措施

隧道超前地质预报工作已是隧道施工中不可缺少的一部分,特别是在不良地质段施工中更应重视这项工作。当前,隧道超前地质预报方法已经从单一的一种预报方法向两种甚至多种方法相结合的综合超前地质预报方法过渡。同时,随着近年来全球地震灾害的频发,针对地震区隧道超前地质预报体系的研究还不成熟,因此,在总结地震区隧道灾害特征及成因的基础上,采用短距离地质分析与长距离物探监测相结合的方法进行超前地质预报工作,再根据预报结果,对影响隧道围岩等级划分的地下水、主要软弱结构面产状、初始应力状态等影响因素进行修正,进而对隧道围岩等级进行动态划分,提高隧道超前预报的准确性,对隧道施工提供更为准确的指导。

The Measures to Improve the Geological Advanced Prediction System of Tunnel in Seismic Area

Tunnel geological advanced prediction has been an indispensable part of tunnel construction,particularly in the construction of poor geological area. Currently, the tunnel geological advanced prediction method has translated from a single method to two or more methods combining comprehensive advanced prediction method of transition. Meanwhile,the global earthquake disaster happened frequently in recent years. The study on the tunnel geological advanced prediction system in seismic area is limited. Combining the gcotogical analysis and gcoplysical prospecting on the basis of the summary of tunnel disaster characters and consequences, according to the prediction result to modify the influence factors such as tunnel groundwater,the main weak structural plane,the initial stress state,then make the dynamic division of tunnel surrounding rock level,which can improve the accuracy of tunnel geological advanced prediction and provide accurate guidance for tunnel construction.