综合超前地质预报技术在高黎贡山隧道中的应用

Application of Comprehensive Advance Geological Forecast Technique in Gaoligong Mountain Tunnel Construction

大理—瑞丽铁路高黎贡山隧道沿线穿越多条断层,且受高地温、涌水突泥、高地应力、岩爆、软岩大变形等不良地质的影响。为确保隧道施工安全,选择以地质调查分析为主,中长距离与短距离相结合的物探法为辅,以超前钻探加以验证的综合超前地质预报体系。依据风险等级,构建了各级风险下的地质预报工作流程。在1#斜井高风险区段通过多种方法探测对比分析,查明了掌子面前方的围岩特征及地下水赋存情况,可为隧道施工方案的制订及围岩设计的变更提供依据。

The Gaoligong mountain tunnel of Dali-Ruili railway crosses multiple faults and is inf luenced by bad geology,such as high ground temperature,water gushing and mud bursting,high crustal stress,rock burst,large deformation of soft rock and so on.A comprehensive advance geological forecast system,which is mainly based on geological survey and analysis,supplemented by geophysical method combining medium-long distance with short distance,and verif ied by advanced drilling,was selected.According to the risk grade,the geological forecast work f low was constructed under all levels of risk.Through comparison and analysis of the high risk section in 1#inclined shaft by various methods,the characteristics of surrounding rock and groundwater occurrence have been found out in front of the tunnel face,which could provide the basis for the formulation of the tunnel construction plan and the change of the surrounding rock design.