Influence of Pile Foundation Construction on Existing Tunnels in a Metro Protection Area: Field Test and Numerical Simulation

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-07-24 DOI:10.3390/buildings14082280

Gang Lin, Wenbin Ke, Shuaishuai Guo, Zhaorui Lin, Changjie Xu, Minliang Chi, Yue Xiao

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Abstract

On the basis of the Fengqi Chaoming project in Hangzhou City, Zhejiang Province, China, this paper investigates the influence of pile foundation construction on the existing tunnels in a metro protection area to ensure the stability and safety of the pile foundation construction in the area of Hangzhou Metro Line 2 through in situ pile tests and numerical simulations. The test results show that the pile foundation construction has a certain influence on the existing metro tunnels, and the degree of influence gradually decreases as the distance between the pile foundation and the metro tunnel increases. The corresponding impact level for the pile foundation at 12 m from the tunnel is 1.06 mm, and that for the pile foundation at 4.9 m from the tunnel is 1.18 mm. Different types of pile foundations also lead to different degrees of influence. The maximum settlement corresponding to triaxial cement mixing piles is 1.89 mm, while the hard-method occlusal piles is 1.18 mm. The monitoring point of the metro tunnel with the smallest distance from the pile foundation experiences the largest deformation, but several sets of deformation data meet the requirements of the deformation control index, indicating that the pile foundation construction is safe and controllable.

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桩基础施工对地铁保护区内现有隧道的影响：现场测试与数值模拟

本文以浙江省杭州市凤起潮鸣项目为基础，通过原位桩试验和数值模拟，研究了地铁保护区内桩基施工对既有隧道的影响，以确保杭州地铁 2 号线保护区内桩基施工的稳定性和安全性。试验结果表明，桩基施工对既有地铁隧道有一定的影响，且随着桩基与地铁隧道距离的增加，影响程度逐渐减小。距离隧道 12 米处的桩基相应的影响程度为 1.06 毫米，距离隧道 4.9 米处的桩基相应的影响程度为 1.18 毫米。不同类型的桩基也会产生不同程度的影响。三轴水泥搅拌桩的最大沉降量为 1.89 毫米，而硬模咬合桩的最大沉降量为 1.18 毫米。距离桩基最小的地铁隧道监测点变形最大，但多组变形数据均满足变形控制指标要求，说明桩基施工是安全可控的。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico