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Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method
Frontiers of Structural and Civil Engineering ( IF 3 ) Pub Date : 2021-04-24 , DOI: 10.1007/s11709-021-0705-0
Shuangxi Feng , Huayang Lei , Yongfeng Wan , Haiyan Jin , Jun Han

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.



中文翻译:

基于层次分析法和有限元法的邻近桥梁基础开挖影响因素及控制措施

开挖过程中的许多不确定因素可能导致桩的横向位移过大或桩的内力过大,以及导致现有桥梁基础周围土壤的过度沉降。安全控制对于确保相邻结构的安全至关重要。本文提出了一种创新方法,该方法将层次分析法(AHP)与有限元方法(FEM)相结合,以揭示不确定因素对周围环境的潜在影响风险。采用层次分析法根据各影响因素的权重确定关键影响因素。有限元法用于量化关键影响因素对周围环境的影响。在层次分析法的基础上,基于工程研究,建立了不确定因素指标体系。计算将下折射率层与上折射率层进行比较的矩阵,以及每个影响因素的权重。发现开挖深度和基坑与桥梁基础之间的距离是基本因素。对于FEM,根据基坑周围没有桥梁的情况对FE基线模型进行了校准。分析了地面沉降监测数据与数值模拟数据之间的一致性。然后进行有限元模拟,以定量分析关键影响因素对桥梁基础的影响程度。此外,重点分析了桥桩基础的横向位移,桩的内力以及桩基础周围的土壤沉降。还确定了最危险的施工条件。最后,提出了两种安全控制措施,以增加支撑位的数量和围护结构的扎根深度。一种将层次分析法与有限元法相结合的新方法可用于确定施工过程中许多不确定因素的关键影响因素,为工程设计和施工提供有益的参考。

更新日期:2021-04-24
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