Abstract
In the southwest of China, the topography and geomorphology are complex, and the geology is changeable, and the karst landforms are widely distributed, which results in exposing existing karst caves in many tunnel constructions. Tunnel design should secure not only the safety of hydraulic pressure-resistant structure during the operation period, but also the hydraulic pressure-resistant performance of primary support during construction. With Yongfutun tunnel as the research object, this paper studied the water pressure change of exposing existing karst caves in the tunnel construction, and double-layer primary support was used to meet the construction safety. The study found the water pressure dissipated to zero with the exposure of existing karst caves. When the steady water pressure of the tunnel lining support system restored to 0.3 MPa, deformations of the single-layer primary support and double-layer primary support were slightly different; deformation of the lining was not a key indicator of structural control; axial force of I-steel, shotcrete, and secondary lining of the double-layer primary support was smaller than that of the single-layer primary support, and the double-layer primary support can well bear the compressive load, and therefore it can resist hydraulic pressure.
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Funding
The work was financially supported by the Open Fund Project for Cultivation Base of State Key Laboratory of Bridge and Tunnel Engineering in Mountain Area (No. CQSLBF-Y16-1), Project Name: Study on the Structure Type and Safety Early Warning System of External Water Pressure in Mountain Rich Water Tunnel; Chongqing Traffic Technology Project (No. CQJK2015-03), Project Name: Study on the Countermeasures of Groundwater Protection and Limited Discharge in Chuntianmen Super Long Tunnel of Nanchuan-Liangjiang New Area Highway; and Chongqing Fuling Science and Technology Commission Science and Technology Project (No. FLKJ 2016BBB1082), Project Name: Co-Key Technologies and Risk Control for Construction Safety of Baitao Tunnel Group under Complex Conditions.
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Responsible editor: Keda Cai
This article is part of the Topical Collection on Geodesy and Geodynamics of China.
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Ding, Y., Xu, L. Hydraulic pressure-resistant design of highway water-rich tunnels traversing exposed karst cave in karst area of peak cluster landform. Arab J Geosci 14, 1998 (2021). https://doi.org/10.1007/s12517-021-08045-8
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DOI: https://doi.org/10.1007/s12517-021-08045-8