[1]石林泽,易利军,郑金辉,等.基于透明土技术的开口管桩施工模拟[J].水文地质工程地质,2018,45(04):113.[doi:10.16030/j.cnki.issn.1000-3665.2018.04.17]
 SHI Linze,YI Lijun,ZHENG Jinhui,et al.Simulation on open-ended pipe pile installation using transparent soil technology[J].Hydrogeology & Engineering Geology,2018,45(04):113.[doi:10.16030/j.cnki.issn.1000-3665.2018.04.17]
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基于透明土技术的开口管桩施工模拟()
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《水文地质工程地质》[ISSN:1000-3665/CN:11-2202/P]

卷:
45卷
期数:
2018年04期
页码:
113
栏目:
工 程 地 质
出版日期:
2018-07-15

文章信息/Info

Title:
Simulation on open-ended pipe pile installation using transparent soil technology
文章编号:
1000-3665(2018)04-0113-08
作者:
石林泽易利军郑金辉齐昌广
宁波大学,浙江 宁波315211
Author(s):
SHI LinzeYI LijunZHENG JinhuiQI Changguang
Ningbo University,Ningbo, Zhejiang315211,China
关键词:
开口管桩土体变形透明土PIV土塞土颗粒位移中性面
Keywords:
open-ended pile soil deformation transparent soil PIV the displacement of neutral surface in soil plug
分类号:
P642.11+6;TU472
DOI:
10.16030/j.cnki.issn.1000-3665.2018.04.17
文献标志码:
A
摘要:
开口管桩因为土塞效应的存在,其施工力学机理比实心桩要复杂。传统的测量方法无法测得整个桩周土体的位移场以及土塞的具体情况。利用透明土技术,模拟不同桩径,壁厚的开口管桩的沉桩过程,得到管桩外侧土体的全部位移场,并观测到土塞高度的变化、土塞中土颗粒的位移向量场和土塞土颗粒位移中性面。通过对实验结果的分析,可以得到以下结论:不同截面尺寸的管桩施工引起的土体变形区域的横向范围与管桩内径与壁厚的比值(r/w)成反比,且每施工2倍管桩外径R深度,横向影响范围扩大67%;当外径相等时,r/w值相差150%时,土塞高度相差186%;土塞效应和桩径无关,和r/w有关;当壁厚保持一定的同时,土塞高度变化量约为管桩内外径比(R/r)的改变量的2倍;土塞达到完全闭塞状态时还会发生桩端土体的剪切破坏,从而管桩内腔涌入新土形成新的土塞。
Abstract:
The open-ended pile due to the existence of the soil effect, its installation mechanism is more complex than the solid pile. The traditional measurement method cannot measure the displacement field of the soil around the pile and the concrete situation of the soil. Using the transparent soil technology, the installation of the open-ended pile with different pile diameter and wall thickness is simulated to obtain the total soil displacement field, height changes in the soil plug, the displacement vector field of the soil plug and the displacement of neutral surface in soil plug. Through the analysis of the test results, we can get the following conclusions: The transverse range of soil deformation area caused by the installation of the open-ended pile with different cross-sectional dimensions is inversely proportional to the ratio of the diameter and wall thickness (r/w), and the transverse influence range is increased by 67% for each installation into the 2R depth of the pile out diameter R. When the outer diameter is equal, r/w value difference of 150%, the soil height difference of 186%, the soil effect is independent of the pile diameter, but is related to r/w. When the wall thickness is kept constant, the height change of the soil plug is about twice as much as the change of the inner and outer diameter ratio (R/r), when the soil plug reaches the fully closed state, the soil at the pile tip will suffer the shear failure, so that the pile cavity influx into the new soil will form a new soil plug.

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备注/Memo

备注/Memo:
收稿日期: 2018-01-16; 修订日期: 2018-03-04
基金项目: 浙江省自然科学基金项目(LY18E080010);宁波市自然科学基金资助项目(2017A610317)
第一作者: 石林泽(1996-),男,本科生,主要从事土木工程方面的研究。E-mail:nbblshilinze@qq.com
通讯作者: 易利军(1982-),男,博士,讲师,主要从事工程力学方面的研究。E-mail:yilijun@nbu.edu.cn
更新日期/Last Update: 2018-07-15