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Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method

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Abstract

Many uncertain factors in the excavation process may lead to excessive lateral displacement or overlimited internal force of the piles, as well as inordinate settlement of soil surrounding the existing bridge foundation. Safety control is pivotal to ensuring the safety of adjacent structures. In this paper, an innovative method is proposed that combines an analytic hierarchy process (AHP) with a finite element method (FEM) to reveal the potential impact risk of uncertain factors on the surrounding environment. The AHP was adopted to determine key influencing factors based on the weight of each influencing factor. The FEM was used to quantify the impact of the key influencing factors on the surrounding environment. In terms of the AHP, the index system of uncertain factors was established based on an engineering investigation. A matrix comparing the lower index layer to the upper index layer, and the weight of each influencing factor, were calculated. It was found that the excavation depth and the distance between the foundation pit and the bridge foundation were fundamental factors. For the FEM, the FE baseline model was calibrated based on the case of no bridge surrounding the foundation pit. The consistency between the monitoring data and the numerical simulation data for a ground settlement was analyzed. FE simulations were then conducted to quantitatively analyze the degree of influence of the key influencing factors on the bridge foundation. Furthermore, the lateral displacement of the bridge pile foundation, the internal force of the piles, and the settlement of the soil surrounding the pile foundation were emphatically analyzed. The most hazardous construction condition was also determined. Finally, two safety control measures for increasing the numbers of support levels and the rooted depths of the enclosure structure were suggested. A novel method for combining AHP with FEM can be used to determine the key influencing aspects among many uncertain factors during a construction, which can provide some beneficial references for engineering design and construction.

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Acknowledgements

The authors acknowledge the National Key Research and Development Program of China (No. 2017YFC0805402), the Open Project of the State Key Laboratory of Disaster Reduction in Civil Engineering (No. SLDRCE17-01), the Incentive Fund for Overseas Visits of Doctoral Students of Tianjin University in 2019 (070-0903077101), and the China Scholarship Council (CSC, 201906250153) for their financial support.

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Authors and Affiliations

  1. Department of Civil Engineering, Tianjin University, Tianjin, 300354, China

    Shuangxi Feng, Huayang Lei & Yongfeng Wan

  2. Coast Civil Structure Safety of Education Ministry, Tianjin University, Tianjin, 300354, China

    Huayang Lei

  3. Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-rural Seismic Resilience, CEA, Tianjin, 300354, China

    Huayang Lei

  4. China Railway 16th Bureau Group the 5th Engineering Co., LTD, Tangshan, 064000, China

    Haiyan Jin & Jun Han

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  1. Shuangxi Feng
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  2. Huayang Lei
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  5. Jun Han
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Correspondence to Huayang Lei.

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Feng, S., Lei, H., Wan, Y. et al. Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method. Front. Struct. Civ. Eng. 15, 461–477 (2021). https://doi.org/10.1007/s11709-021-0705-0

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  • DOI: https://doi.org/10.1007/s11709-021-0705-0

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