Bearing capacity characteristics of bionic teeth root pile based on transparent soil model testing technique

ZONG Zixu; ZHENG Peng; DENG Zetian; ZHANG Wengang; WANG Luqi

doi:10.11835/j.issn.2096-6717.2022.081

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Bearing capacity characteristics of bionic teeth root pile based on transparent soil model testing technique

Civil Engineering | 更新时间：2023-07-10

- Bearing capacity characteristics of bionic teeth root pile based on transparent soil model testing technique
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 19-28(2023)
- 作者机构：
  
  1.重庆大学，土木工程学院，重庆 400045
  2.重庆大学，山地城镇建设与新技术教育部重点实验室，重庆 400045
- 作者简介：
  
  brief: ZONG Zixu (2001- ), main research interest: geotechnical engineering, E-mail: zongzixu2022@163.com.
  ZHANG Wengang （corresponding author）, professor, doctorial supervisor, E-mail: zhangwg@cqu.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(5202780029);Natural Science Foundation of Chongqing(cstc2020jcyj-jq0087);Mine Disaster Prevention and Control Laboratory Open Fund(MDPC201902)
- DOI：10.11835/j.issn.2096-6717.2022.081
  CLC： TU473.1
- Received：06 May 2022，
  
  Published：25 August 2023
- 稿件说明：
移动端阅览
ZONG Zixu, ZHENG Peng, DENG Zetian, et al. Bearing capacity characteristics of bionic teeth root pile based on transparent soil model testing technique[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 19-28.
DOI：

ZONG Zixu, ZHENG Peng, DENG Zetian, et al. Bearing capacity characteristics of bionic teeth root pile based on transparent soil model testing technique[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 19-28. DOI： 10.11835/j.issn.2096-6717.2022.081.

摘要

基于仿生学原理并结合哺乳动物下颌磨牙承载力高的特点，提出一种模仿哺乳动物下颌磨牙的仿生牙根桩，仿生牙根桩的承载性能和沉桩时的挤土效应不同于传统底部截面为圆形的锥形或平底桩。结合数值方法和模型试验研究其承载特性及沉桩过程中的桩—土作用，采用DEM离散元方法进行数值模拟研究，发现仿生牙根桩能大幅提高桩底承载力，但易引起土体应力集中。基于数值模拟结果进行模型试验，采用基于透明土模型试验的粒子图像测速技术（PIV），利用沉桩加载仪和CCD高速工业相机连续拍摄沉桩加载过程中桩周土体在线性激光器下产生的散斑场，得到整个土体的位移场。结果表明：仿生牙根桩对竖向荷载的承载能力超过普通锥形桩1倍左右，引发的桩身拖曳效应与桩底部竖向土体位移更加显著，且在桩中心内凹不太大时，其引发的土体横向位移较小。

Abstract

For the first time

a bionic root pile imitating mammalian lower jaw molars is proposed

based on the principle of biomimicry and combined with the characteristics of high bearing capacity of mammalian mandibular molars. The bearing performance of bionic root piles and the extrusion effect of sinking piles differ from the conventional conical or flat bottom piles with circular bottom sections. In conjunction with a combination of numerical methods and model experiments are used to explore their bearing characteristics and the role of piles-soil in the pile sinking process. First

the discrete element method (DEM) was adopted for numerical simulation

and it was discovered that the bionic tooth root pile can significantly enhance the bearing capacity of the pile bottom

but was prone to causing soil stress concentration. As for the model test

the particle image velocimetry (PIV) technique based on the transparent soil model test was implemented

and the pile loading instrument and CCD high-speed industrial camera were used to continuously capture the scattered field generated by the pile peri-pile soil under the linear laser during the pile loading process

and the velocity and displacement field of the soil mass were obtained. Ordinary conical piles and bionic root piles were subjected to immersion tests

with the results indicating that the bearing capacity of bionic root piles on vertical loads was greater than double that of ordinary conical piles

and that the dragging effect of the pile body and the displacement of vertical soil at the bottom of the pile were more pronounced. Furthermore

when the concave at the pile's center was not excessively large

the transverse displacement of the soil was minimal.

关键词

Keywords

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