Calculation method of ultimate bearing capacity for rock layer of pile tip of bridge pile groups with underground karst cave

LEI Yong; CHEN Yu-si; TAN Hao; LI Peng-jia; LIU Yun-si; YU Yi-lin

doi:10.16285/j.rsm.2022.1886

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Calculation method of ultimate bearing capacity for rock layer of pile tip of bridge pile groups with underground karst cave

更新时间：2026-06-25

- Calculation method of ultimate bearing capacity for rock layer of pile tip of bridge pile groups with underground karst cave
- Vol. 44, Issue 12, Pages: 3339-3348(2023)
- 作者机构：
  
  1. 湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南,湘潭,411201
  2. 中建市政工程有限公司,北京,100071
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.1886
  CLC： U443.15
- Online First：21 December 2023，
  
  Published：2023
- 稿件说明：
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LEI Yong, CHEN Yu-si, TAN Hao, et al. Calculation method of ultimate bearing capacity for rock layer of pile tip of bridge pile groups with underground karst cave[J]. 2023, 44(12): 3339-3348.
DOI：

LEI Yong, CHEN Yu-si, TAN Hao, et al. Calculation method of ultimate bearing capacity for rock layer of pile tip of bridge pile groups with underground karst cave[J]. 2023, 44(12): 3339-3348. DOI： 10.16285/j.rsm.2022.1886.

摘要

为探究下伏空洞桥梁群桩桩端岩层的承载机制和破坏模式，进行了单桩及不同桩数群桩的室内模型试验研究，得到了不同桩数群桩桩端岩层的极限承载力和破坏模式。根据下伏空洞桥梁群桩桩端岩层破坏模式的特点将破坏面分为两个部分，结合极限分析法提出了下伏空洞桥梁群桩桩端岩层极限承载力计算方法，理论计算值与室内试验值吻合良好，验证了计算方法的合理性。同时分析了桩端岩层极限承载力随桩数增加的变化规律，可为岩溶区桥梁桩基工程建设提供参考。试验及理论计算结果表明：1）下伏空洞群桩桩端岩层发生整体冲切破坏时，破坏体整体可视为与单桩破坏体等效的大型墩基；（2）当桩间距较小时，群桩桩端岩层极限承载力随外围基桩外包络线长度增大而增加，当外包络线长度相同时，内部基桩布置方式对群桩桩端岩层极限承载力无影响；（3）群桩效应系数随桩间距的增大而增加，临界桩间距为5～6（为桩径）。

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