Bearing behavior of pile foundation in karst region: Physical model test and finite element analysis

IF 5.8 4区工程技术 Q1 MECHANICS

Applied Rheology Pub Date : 2024-02-23 DOI:10.1515/arh-2023-0115

Minghong Sheng, Fangqing Lu, Nan Jiang, Panpan Guo, Xian Li, Ran An, Yixian Wang

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Abstract

The presence of karst formations significantly impacts the load-bearing capacity of pile foundations in karst geological environments, posing a challenge to their design. This study investigated the bearing characteristics of karst pile foundations using the physical model test and numerical analysis. First, the influence of cave height and span on the bearing capacity of pile foundations is examined using model tests. The results demonstrate that the height of karst caves greatly affects the bearing capacity of karst pile foundations. Subsequently, numerical analysis further explores the bearing characteristics of these foundations. It reveals that as the top load on pile increases, an arch-shaped tensile damage zone forms at the top of karst cave and gradually expands. The rock failure in this area leads to a decrease in adhesion between rock strata and pile foundation, consequently reducing its load-bearing capacity. Finally, experimental results are compared with numerical results to validate consistency and mutual verifiability between physical model tests and numerical analyses. The outcomes of the research provide valuable insights for designing rock-socketed pile foundations in similar karst areas.

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岩溶地区桩基的承载行为：物理模型试验和有限元分析

岩溶地层的存在严重影响了岩溶地质环境中桩基的承载能力，给桩基设计带来了挑战。本研究采用物理模型试验和数值分析方法研究了岩溶桩基的承载特性。首先，利用模型试验研究了溶洞高度和跨度对桩基承载力的影响。结果表明，岩溶洞穴的高度对岩溶桩基的承载力有很大影响。随后，数值分析进一步探讨了这些地基的承载特性。结果表明，随着桩顶荷载的增加，岩溶洞穴顶部会形成一个拱形拉伸破坏区，并逐渐扩大。该区域的岩石破坏导致岩层与桩基之间的附着力下降，从而降低了桩基的承载能力。最后，实验结果与数值结果进行了比较，以验证物理模型试验与数值分析之间的一致性和相互可验证性。研究成果为在类似岩溶地区设计嵌岩桩基础提供了宝贵的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Rheology 物理-力学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.