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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年06期

页码:

149-157

栏目:

岩土工程

出版日期:

2025-11-25

文章信息/Info

Title:

Research on calculation method of micro-pile group based on Pasternak foundation model

文章编号:

1673-2049(2025)06-0149-09

作者:

郑明新¹,阮钰华^1,2,胡红萍³,聂宏智³

(1. 华东交通大学 山区土木工程安全与韧性全国重点实验室,江西 南昌 330013; 2. 中铁西安勘察设计研究院有限责任公司,陕西 西安 710054; 3. 南昌铁路勘察设计院有限责任公司,江西 南昌 330002)

Author(s):

ZHENG Mingxin¹, RUAN Yuhua^1,2, HU Hongping³, NIE Hongzhi³

(1. State Key Laboratory of Safety Resilience of Civil Engineering in Mountain Area, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. China Railway Xi'an Survey, Design and Research Institute Co. Ltd., Xi'an 710054, Shaanxi, China; 3. Nanchang Railway Survey and Design Institute Co., Ltd., Nanchang 330002, Jiangxi, China)

关键词:

微型桩群;  Pasternak地基模型;  剪切刚度;  解析解

Keywords:

micro-pile group;  Pasternak foundation model;  shear stiffness;  analytical solution

分类号:

TU473

DOI:

10.19815/j.jace.2024.09047

文献标志码:

A

摘要:

为得到更精确的微型桩群位移及内力计算结果,引入Pasternak地基模型中的剪切刚度G来考虑桩周土体受力变形的连续性,结合微型桩群计算理论及滑坡推力分布函数,基于Pasternak地基模型推导了适应多种滑坡推力分布形式的微型桩桩身挠曲微分方程解析解; 通过算例对解析解的准确性进行了验证,并结合工程实例对微型桩群进行了拆分计算,最后研究了剪切刚度G对计算精度的影响。结果表明:建立的基于Pasternak地基模型的微型桩群计算模型解析解与有限元解及试验值的位移变化趋势大致相同,且位移最大值均出现在桩顶位置,说明解析解有效; 相较于Winkler地基模型,基于Pasternak地基模型的微型桩群前后排桩解析解的计算结果精度更高。

Abstract:

In order to obtain more accurate calculation results of displacement and internal force for micro-pile groups, the shear stiffness G in Pasternak foundation model was introduced to consider the continuity of stress and deformation of the soil around piles. Combining the calculation theory of micro-pile groups and the distribution function of landslide thrust, the analytical solution of differential equation for the deflection of micro-pile bodies adapted to various forms of landslide thrust distribution was derived based on Pasternak foundation model. The accuracy of analytical solution was verified through numerical examples, and a split calculation was performed on micro-pile group using an engineering case. Finally, the influence of shear stiffness G on the calculation accuracy was studied. The results show that the analytical solution of the established micro-pile group calculation model based on Pasternak foundation model shows a similar trend in displacement variation to the finite element solution and experimental values, and the maximum displacement all appears at the pile top, indicating that the presented analytical solution is effective. Compared with the Winkler foundation model, the analytical solution calculation results for the front and rear rows of micro-piles based on Pasternak foundation model exhibit higher accuracy.

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相似文献/References:

[1]任青阳,王彦丁,王坤,等.锚索微型桩群在顺层岩质边坡加固中的抗滑特性对比研究[J].建筑科学与工程学报,2025,42(06):140.[doi:10.19815/j.jace.2024.08096]
　REN Qingyang,WANG Yanding,WANG Kun,et al.Comparative study on anti-sliding characteristics of anchor cable micro-pile group in bedding rock slope reinforcement[J].Journal of Architecture and Civil Engineering,2025,42(06):140.[doi:10.19815/j.jace.2024.08096]

备注/Memo

备注/Memo:

收稿日期:2024-09-16
基金项目:国家自然科学基金项目(51568022); 江西省自然科学基金重点项目(20242ACB202005)
作者简介:郑明新(1966-),男,工学博士,教授,博士生导师,E-mail:492001473@qq.com。

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更新日期/Last Update: 2025-11-25