Centrifuge model tests on the bearing behavior of large-diameter rock-socketed pile group in valley area

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-05-22 DOI:10.1007/s10064-025-04364-2

Hao Zhang, Dwayne Tannant, Haofeng Xing, Lei Zhu, Xiaopeng Guo

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Abstract

Large-diameter rock-socketed pile groups are an effective method for distributing bridge and traffic loads in long-span bridges. Currently, the bearing behavior of large-diameter rock-socketed pile groups in valley areas remains insufficiently understood. In order to understand the bearing behavior of large diameter rock-socketed pile group in valley area, three centrifuge model tests were carried out to simulate the mechanical characteristics of pile group with different slope angle. The results indicated that pile groups shown linear load-settlement responses until the ultimate load, and the settlement of pier cap was positively correlated with slope angle. There are obvious differences in the load sharing of single piles, and the existence of the slope angle exacerbated the differences in load sharing for single piles. Moreover, the tendency of axis force-depth was similar, showing that the axis force of the large-diameter rock-socketed pile decreased modestly in the overburden layer, and decreased steeply in the rock-socketed layer. The slope angle reduces the shaft resistance of the overburden layer, which reduces the bearing capacity of the group pile, and this negative effect increases with the slope angle. Accordingly, the valuable results obtained from the centrifugal model tests to guide the design and construction of large diameter rock-socketed pile group in valley area.

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谷地大直径嵌岩桩群承载性能离心模型试验

大直径嵌岩桩群是大跨度桥梁中分配桥梁和交通荷载的有效方法。目前，对河谷地区大直径嵌岩桩群的承载特性还不够了解。为了了解河谷地区大直径嵌岩桩群的承载特性，进行了3次离心模型试验，模拟了不同坡角下嵌岩桩群的受力特性。结果表明：在极限荷载前，群桩均表现为线性荷载-沉降响应，承台沉降与坡角呈正相关；单桩荷载分担存在明显差异，坡角的存在加剧了单桩荷载分担差异。轴力-深度变化趋势相似，表明大直径嵌岩桩的轴力在覆盖层中略有下降，在嵌岩层中急剧下降。坡角降低了覆盖层的轴阻力，降低了群桩的承载力，且这种负作用随着坡角的增大而增大。因此，离心模型试验所获得的有价值的结果对指导河谷地区大直径嵌岩群桩的设计与施工具有一定的指导意义。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.