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Application of the comprehensive forecast system for water-bearing structures in a karst tunnel: a case study

机译:岩溶隧道含水结构综合预报系统的应用:案例研究

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摘要

While tunneling in karst terrains, engineers may encounter unpredictable well-developed karst conduits, which frequently lead to water inrush accidents. Geological processes significantly affect the varieties and characteristics of water-bearing structures. Therefore, a comprehensive system for water-bearing structure prediction is first put forward, and then the geological and hydrogeological engineering conditions of the Yuelongmen tunnel in Southwest China are analyzed. To accurately predict the geometric characteristics of water-bearing structures and their spatial relationship with the tunnel face, the transient electromagnetic method (TEM) and ground-penetrating radar (GPR) were comprehensively applied. Then, the induced polarization method (IP) was utilized separately to detect the three-dimensional position and spatial distribution pattern of the water-rich area. According to the comprehensive forecast conclusion, targeted boreholes were drilled, which were selected to verify the water-bearing structure in the survey area. The drilling and detection results matched. Furthermore, the curtain grouting method was adopted for the treatment of the water-rich area. By establishing a comprehensive prediction technology system with the principle of from qualitative analysis to quantitative identification, from structure locating to the water-bearing structure discrimination, as well as from far and near, this comprehensive prediction system was successfully put into practice in the karst tunnel in Sichuan; it can play a guiding role in similar projects.
机译:在岩溶地形中开挖隧道时,工程师可能会遇到无法预测的发育良好的岩溶导管,这经常会导致水浸事故。地质过程显着影响含水结构的种类和特征。因此,首先提出了一套综合的含水结构预测系统,然后对西南岳龙门隧道的地质和水文地质工程条件进行了分析。为了准确预测含水结构的几何特征及其与隧道工作面的空间关系,综合应用了瞬变电磁法(TEM)和探地雷达(GPR)。然后,分别利用感应极化法(IP)检测富水区的三维位置和空间分布格局。根据综合预测结论,钻探了目标井眼,并选择了该井眼以验证调查区的含水构造。钻孔和检测结果匹配。此外,采用帷幕灌浆法处理富水区。通过建立从定性分析到定量识别,从结构定位到含水结构判别以及远近等原理的综合预测技术体系,将该综合预测系统成功地应用于岩溶隧道中。在四川它可以在类似项目中发挥指导作用。

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