Detection and treatment of water inflow in karst tunnel: A case study in Daba tunnel
- 53 Downloads
In a karst tunnel, fissures or cracks that are filled with weathered materials are a type of potential water outlet as they are easily triggered and converted into groundwater outlets under the influence of high groundwater pressure. A terrible water inrush caused by potential water outlets can seriously hinder the project construction. Potential water outlets and water sources that surrounding the tunnel must be detected before water inflow can be treated. This paper provides a successful case of the detection and treatment of water inflow in a karst tunnel and proposes a potential water outlet detection (PWOD) method in which heavy rainfall (>50 mm/d) is considered a trigger for a potential water outlet. The Daba tunnel located in Hunan province, China, has been constructed in a karst stratum where the rock mass has been weathered intensely by the influence of two faults. Heavy rain triggered some potential water outlets, causing a serious water inrush. The PWOD method was applied in this project for the treatment of water inflow, and six potential water outlets in total were identified through three heavy rains. Meanwhile, a geophysical prospecting technique was also used to detect water sources. The connections between water outlets and water sources were identified with a 3-D graphic that included all of them. According to the distribution of water outlets and water sources, the detection area was divided into three sections and separately treated by curtain grouting.
KeywordsKarst tunnel Water inrush Potential water outlet detection Geophysical prospecting technique Water inflow Grouting
Unable to display preview. Download preview PDF.
This work was supported by the National Key Research and Development Project (Grant No. 2016YFC0801604) and Natural Science Foundation of Shandong Province (Grant No. ZR2017MEE070).
- Gómez-Ortiz D, Montesinos FG, Martín-Crespo T, et al. (2014) Combination of geophysical prospecting techniques into areas of high protection value: Identification of shallow volcanic structures. Journal of Applied Geophysics 109: 15–26. https://doi.org/10.1016/j.jappgeo.2014.07.009 CrossRefGoogle Scholar
- Li S, Liu R, Zhang Q, et al. (2013) Research on C-S slurry diffusion mechanism with time-dependent behavior of viscosity. Chinese Journal of Rock Mechanics and Engineering 32(12): 2415–2421. (In Chinese)Google Scholar
- Li X, Qi Z, Xue G, et al. (2010) Three dimensional curved surface continuation image based on tem pseudo wave-field. Chinese Journal of Geophysics 53(12): 3005–3011. (In Chinese) https://doi.org/10.3969/j.issn.0001-5733.2010.12.025 Google Scholar
- Liu R, Li S, Zhang Q, et al. (2011) Experiment and application research on a new type of dynamic water grouting material. Chinese Journal of Rock Mechanics and Engineering 30(7): 1454–1459. (In Chinese)Google Scholar
- Mao B, Zhang G, Tang B, et al. (2016) Analysis of Mechanism of Water-inrush of the 1# Transverse of Gangwu Tunnel in the Shanghai—Kunming Passenger Special Line. Journal of railway Engineering Society (06): 83–87. (In Chinese)Google Scholar
- Qiang Q, Rong X. (2008) State, issues and relevant recommendations for security risk management of China's underground engineering. Chinese Journal of Rock Mechanics and Engineering 27(4): 649–655. (In Chinese) https://doi.org/10.3321/j.issn:1000-6915.2008.04.001 Google Scholar
- Xu J, Huang S. (1996) Mechanism of burst mud and spring water of the Dayaoshan tunnel. Journal of Railway Engineering Society (02): 83–89. (In Chinese)Google Scholar