Stability calculation of micro steel tube mortar composite pile in soil

ZHU Yan-peng; YAN Zi-hao; ZHU Yi-fan

doi:10.16285/j.rsm.2019.0583

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Stability calculation of micro steel tube mortar composite pile in soil

更新时间：2026-06-25

- Stability calculation of micro steel tube mortar composite pile in soil
- Vol. 41, Issue 4, Pages: 1339-1346(2020)
- 作者机构：
  
  1. 兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃,兰州,730050
  2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃,兰州,730050
  3. 马里兰大学科利奇帕克分校，美国马里兰州科利奇帕克,20740
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.0583
  CLC： TU473.1
- Online First：01 July 2020，
  
  Published：2020
- 稿件说明：
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ZHU Yan-peng, YAN Zi-hao, ZHU Yi-fan. Stability calculation of micro steel tube mortar composite pile in soil[J]. 2020, 41(4): 1339-1346.
DOI：

ZHU Yan-peng, YAN Zi-hao, ZHU Yi-fan. Stability calculation of micro steel tube mortar composite pile in soil[J]. 2020, 41(4): 1339-1346. DOI： 10.16285/j.rsm.2019.0583.

摘要

微型钢管砂浆复合桩因纠偏受力明确、施工简单、工期短且加固费用低，被广泛用于基础加固托换。但小直径、大长度的微型钢管砂浆复合桩在土体中失稳破坏缺乏理论研究。故以弹性地基梁理论为基础，依据桩与地基土共同工作时的受力关系，建立微分方程求解。给出了微型钢管砂浆复合桩失稳承载力具体表达式，并与实际工程原位试验相比较，理论与试验结果接近；给出了最小临界计算长度的表达式指导工程施工；并运用Matlab编写程序计算分析了土与桩在不同的刚度比下不同桩长的失稳荷载，反映出土对微型钢管砂浆复合桩失稳约束力的影响程度。

Abstract

The micro steel tube mortar composite pile is widely used in foundation reinforcement and pile replacement because of its clear force mechanism

simple construction

short construction period and low cost. However

there is rare theoretical study on instability or failure of micro steel tube mortar composite piles with small diameter and large length in soil. Therefore

on the basement of the theory of elastic foundation beam

the differential equation is solved according to the force relationship between the pile and the foundation soil. The specific expression of the bearing capacity for instability of the micro steel tube mortar composite pile is given. By comparing with the actual engineering in situ test

it is found that the theoretical and experimental results are close. An expression calcuating the minimum critical length is given to guide the construction of the project. Through a program writen in Matlab

the instability load refering to different pile lengths is calculated and analyzed under different stiffness ratios between soil and pile

which reflects the influence degree of soil on the instability and restraint force of micro steel tube mortar composite piles.

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