Model test for water inrush caused by karst caves filled with confined water in tunnels
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In this study, a water inrush model test system for high ground stresses and hypertonic tunnels is developed to examine the evolution process of karst cave water inrush events induced by tunnel construction and rainfall. A 3D fluid-solid coupling model test is performed to simulate the tunnel excavation and increasing karst cave water pressure, and the evolutionary mechanism of karst water inrush induced by tunnel construction is revealed. The results indicate that seepage occurs during the tunnel excavation, and water seepage ceases after timely support. During hydraulic loading, the experiment successively obtained the stages corresponding to the occurrence of partial dripping, water streams, support bulging, partial and complete support block falls, and water inrush. The influence of tunnel excavation on the stability of the surrounding rock of the monitoring surface increases sharply when the distance between the tunnel excavation surface and the monitoring surface is approximately 0.5–1 times the diameter of the tunnel. The research results are significant for studies examining the water inrush mechanism and the prevention of tunnel water inrush disasters.
KeywordsTunnel engineering Karst cave Water inrush Model test
Much of the work presented in this paper was supported by National Natural Science Foundation of China (Grant Nos. 51879148, 51979154), Shandong Provincial Keypoint Research and Invention program (Grant No. 2019GSF111018), China Postdoctoral Science Foundation (Grant No. 2019M660937).
- Hu H, Zhang B, Zuo Y et al (2018b) The mechanism and numerical simulation analysis of water bursting in filling karst tunnel. Geotech Geol Eng 36(2):1197–1205Google Scholar
- Knez M, Slabe T et al (2016) Development and karstification of the karst aquifer as discovered between Klanec and Črni Kal. cave exploration in Slovenia. Springer International PublishingGoogle Scholar
- Li S, Zhang Q (2014) Tunnel and underground engineering water burst mechanism and governance. China Communications Press, BeijingGoogle Scholar
- Li L, Li S, Zhang Q (2010) Study of mechanism of water inrush induced by hydraulic fracturing in karst tunnels. Rock Soil Mech 02:523–528Google Scholar
- Liu XM, Sheng Q, Chen J et al (2015) Seismic shaking table test for large-scale underground cavern group (II): test scheme. Rock Soil Mech 06:1683–1690Google Scholar
- Ma D, Bai H et al (2016) Compaction and seepage properties of crushed limestone particle mixture: an experimental investigation for ordovician karst collapse pillar groundwater inrush. Environ Earth Sci. https://doi.org/10.1007/s12665-015-4799-3
- Marinos P (2001) Tunneling and mining in karstic terrane; an engineering challenge. In: Beck BF, Herring JG (eds) Geotechnical and environmental applications of karst geology and hydrology. Balkema, Lisse, pp 3–16Google Scholar
- Petrovic A, Calic J, Spalevic A et al (2016) Evolution of collapse valleys in karst-examples from the Carpatho-Balkanides of Serbia //EGU General Assembly Conference Abstracts, 18: 680Google Scholar
- Qian Q (2012) The challenge and countermeasure of underground engineering construction safety. Chin J Rock Mech Eng 31(10):1945–1956Google Scholar
- Wang L, Song Y, Miao X (2003) Study on prediction of water-inrush from coal floor based on cusp catastrophic model. Chin J Rock Mech Eng 22(4):573–577Google Scholar
- Zhong G, Xu G, Yan C et al (2004) Study of water-inrush from water-pressed floor based on cusp catastrophic model. Min R D 24(6):88–90Google Scholar