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岩溶地区地铁隧道施工过程中,突水、突泥等地质灾害频发,应采取有效的超前地质预报方法进行预报。城市地铁隧道较公路、铁路隧道具有埋深浅、环境复杂、干扰因素多的特点,不可照搬公路、铁路隧道的超前地质预报方法。本文通过分析岩溶地区地铁超前地质预报的特点,提出一种综合预报方法,即洞外采用高密度电法,洞内采用掌子面素描和地质雷达。利用该方法对南宁地铁二号线某暗挖段进行了超前地质预报,预报结果与实际开挖情况较吻合,预报效果良好,对类似工程具有借鉴意义。
During the construction of metro tunnels in karst areas, frequent geological disasters such as water inrush and mudslide should be predicted effectively by advanced geological prediction methods. Compared with highways and railway tunnels in urban metro tunnels, it has the characteristics of shallow buried depth, complex environment and many interference factors, and can not copy the advanced geological prediction methods of highways and railway tunnels. In this paper, by analyzing the characteristics of advance geological forecast of metro in karst area, a comprehensive forecasting method is proposed, that is, high-density electric method is adopted outside the cave, and the sketch of the surface and the ground-based radar are adopted in the cave. This method is applied to the advanced geological prediction of some undercut section of Nanning Metro Line 2. The prediction results are in good agreement with the actual excavation situation, and the prediction results are good, which can be used as reference for similar projects.