岩溶地区隧道施工综合预报技术案例分析

由于岩溶地区隧道地质条件的复杂性,在隧道施工过程中实施准确及时的隧道综合地质超前预报是非常有必要的,并且对隧道内不同段落进行风险评价和风险分级,以实现和提高对岩溶隧道不良地质灾害的综合预报。此次研究以伊家岩隧道为工程背景,通过严格实施该综合超前地质预报方案,成功预报了隧道掌子面前方的岩溶,结合预报结果和实际揭露的对比分析,其综合预报准确率可到90%以上,证实了该综合预报方法具有较高的系统性和工作效率,有效地指导了隧道的安全施工,为同类工程提供了技术资料和经验。

Case study on risk forecast technique during tunnel construction at karst area

Because of the complicated variable geological environment in the tunnel in the karst areas,it is so necessary to implement the precise and immediate comprehensive advanced forecast of geology in tunnel,and to evaluate the risk of different parts along the tunnel,then,the risk rank will be given,finally,the method of unfavorable geological karst tunnel comprehensive prediction of geological hazards has been achieved and improved.In this paper,taking the Yinjiayan tunnel as the example,during the construction of the tunnel,the comprehensive geological prediction technology is implemented strictly for the tunnel complex karst geological environment conditions,which is successful to predict the karst cave in front of the tunnel face.According to the comparative analysis between the forecast result and geologic conditions in this tunnel,The accuracy of the overall prediction is more than 90%.In a word,it is confirmed that the comprehensive prediction method has the high efficiency and systematic properties.Then,the way provides a new effectively guidance for the safety of the tunnel construction and technical information and the experience to the similar projects.