Abstract
Tunnel excavation has significant disturbance on groundwater system and related geo-environment, especially in karst regions like southwestern China. The present research was conducted to quantitatively understand the negative impacts posed by tunnel construction on the karst groundwater system and reveal the behavior of karst groundwater system under the tunnel disturbance, with the aid of field survey, hydrogeological analysis, and numerical simulation. The results suggested that negative impacts such as loss of surface and underground water, ground collapse, and house deformation would be posed directly and indirectly to the karst groundwater system and its dependent geo-environment as the result of groundwater level drawdown by tunnel excavation. The degree and range of groundwater drainage impact were determined by the lithological and hydrogeological characteristics of strata. These negative impacts were dominantly distributed in the karst depressions valleys, and the direct ones occurred at first and followed by the indirect ones. Simulation results showed groundwater level drawdown would not occur synchronously in spatial, but always occurred around the tunnel axis at first and gradually expanded towards far away over time. The maximum disturbance on groundwater system can reach to approximately 25 m vertically and 3000 m horizontally for present modeling tunnel. With the aid of numeral simulation, three response stages were identified for the karst groundwater system behavior to the tunnel disturbance. The impacts of tunnel practice on groundwater and surface water bodies can be gradually eliminated since the second stage, but would continue if existing failure of tunnel waterproof until a new balance state achieved. The present research can improve the understanding of the impacts of tunnel excavation on karst groundwater system and dependent geo-environment, and provide reference to the protection of water resources and geo-environment in karst regions like Chongqing worldwide.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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The study is financially supported by the Chongqing Geological Disaster Prevention Fund Project (120301) of Land and Resource & Housing Authority of Chongqing. The authors appreciate the supports deeply.
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Chang Yang Si Chen: conceptualization, methodology, data curation, writing—original draft. Haiyou Peng: writing—review and editing; supervision. Chang Yang: writing—review and editing; project administration. Bolin Chen: writing—review and editing. Lichuan Chen: writing—review and editing.
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Chen, S., Peng, H., Yang, C. et al. Investigation of the impacts of tunnel excavation on karst groundwater and dependent geo-environment using hydrological observation and numerical simulation: a case from karst anticline mountains of southeastern Sichuan Basin, China. Environ Sci Pollut Res 28, 40203–40216 (2021). https://doi.org/10.1007/s11356-021-13919-1
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DOI: https://doi.org/10.1007/s11356-021-13919-1