|Table of Contents|

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

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

Issue:
2025年06期
Page:
149-157
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on calculation method of micro-pile group based on Pasternak foundation model
Author(s):
ZHENG Mingxin1;  RUAN Yuhua1; 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)
Keywords:
micro-pile group;  Pasternak foundation model;  shear stiffness;  analytical solution
PACS:
TU473
DOI:
10.19815/j.jace.2024.09047
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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Last Update: 2025-11-25