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Optimization of a deep foundation pit dewatering scheme in gypsum-bearing strata

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Abstract

The hydrodynamic changes and ground settlement induced by engineering dewatering have received much attention, and leakage between different aquifers is often neglected. Obviously, the leakage strength is crucial for the safety of underground engineering in soluble rock distribution areas. In this paper, we examined the Tianfu New Area in Chengdu, China, which contains a paste salt formation, based on numerical simulation techniques, characteristics of hydrodynamic field, leakage strength and ground settlement changes under different combinations of pumping well filter length and waterproof curtain depth were investigated. In the process of optimizing the dewatering scheme for this area, the leakage strength was innovatively included in the evaluation index. We found that as the depth of waterproof curtain increases, the trend of ground settlement and leakage strength caused by dewatering can be divided into a rapid decline phase and a gradual decline phase. However, the critical curtain depths of the two stages of ground settlement and leakage strength are different. The optimization scheme for dewatering engineering was determined under hydrodynamic, leakage strength, and ground settlement constraints. The filter length of the corresponding optimization scheme was 12 m, and the suitable depth of the waterproof curtain was 14–16 m. Our results provide an effective solution and method for optimizing the dewatering scheme in underground engineering projects with gypsum-bearing strata.

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Acknowledgements

This study was supported by the Chengdu Multi-factor City Geological Survey (DD20189210) and Comprehensive Geological Survey of Resources and Environment in the Cheng-Mian-Le Development Zone of the Shuangcheng Economic Circle in the Chengdu-Chongqing Area (DD20211402).

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Contributions

SP: investigation, numerical simulation, writing-original draft. FW: project administration, supervision, writing—review and editing. DW: data validation. SL: investigation. YY: simulation scheme guidance. MW: investigation. HP: investigation. YC: project administration. All authors reviewed the manuscript.

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Correspondence to Fugang Wang.

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The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

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Ping, S., Wang, F., Wang, D. et al. Optimization of a deep foundation pit dewatering scheme in gypsum-bearing strata. Environ Earth Sci 83, 8 (2024). https://doi.org/10.1007/s12665-023-11310-6

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