强夯置换中碎石运动机制和成墩过程的数值模拟

郑凌逶; 周风华; 谢新宇

强夯置换中碎石运动机制和成墩过程的数值模拟 English Version

郑凌逶^{1, 4},
周风华^1,2,,
谢新宇^{3, 4}

1. 宁波大学省部共建冲击工程与安全教育部重点实验室,浙江宁波315211; 2. 宁波大学机械工程与力学学院,浙江宁波 315211; 3. 浙江大学宁波理工学院,浙江宁波 315100; 4. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310058

基金项目: 宁波市"近海冲击与安全工程"创新团队项目

详细信息

作者简介:
郑凌逶(1989- )，男，浙江乐清人，博士研究生，主要从事冲击动力学、岩土工程方面的研究。E-mail: zhenglingwei@hotmail.com。

通讯作者:
周风华

中图分类号: TU472
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出版历程
- 收稿日期: 2013-02-01
- 发布日期: 2013-11-19

Numerical simulation of forming of replacement piers during a dynamic replacement process

ZHENG Ling-wei^{1, 4},
ZHOU Feng-hua^1,2,,
XIE Xin-yu^{3, 4}

1. MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, China; 2. Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China; 3. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; 4. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 关于强夯置换碎石墩形成机理（特别是碎石运动和动态成墩过程）的数值模拟研究较少。之前的数值模拟研究往往将碎石垫层视为均匀的连续介质进行分析,偏离了碎石体的物理实质。将碎石分为个体分散接触进行了建模,对单次夯击和连续多次夯击过程中碎石体的变形成墩过程进行了数值模拟。分析结果表明：将碎石垫层视为分离的碎石个体进行模拟可展现强夯置换中碎石墩的形成过程及其变形机制；强夯置换过程按时间顺序可分为夯锤与碎石的能量传递和碎石垫层之间的应力波传播过程、碎石垫层接触软土后的整体变形、夯锤二次冲击碎石结构重分布、稳定结构的碎石与夯锤共同运动4个阶段,并分别阐述了各阶段的具体原因和作用；从铅垂方向排列碎石的水平运动分析了整体成墩的原因。通过对连续夯击过程的数值模拟,获得了夯锤运动状态、能量释放时间变化规律,数值模拟得到的夯锤运动位移、速度、加速度与试验观测结果比较吻合。
- 强夯置换 /
- 冲击动力学 /
- 碎石墩 /
- 碎石体变形 /
- 形成过程 /
- 数值模拟
Abstract: Numerical studies on the forming mechanism of replacement piers are scarce, particularly on the kinetic movement of the reinforcement (the stones) and the deformation of the gravel layers. Previous studies tend to treat the stone layer as a continuum, which does not conform to the reality. The numerical simulation is conducted to study the movement of many stones in the soils during the dynamic replacement process. The deformation and forming process of the reinforcement are modeled as the frictionally contacting circular granules. The dynamic replacement process is also simulated under repeated impacts. The numerical results show the forming process of the reinforcement pier. The movement and the distribution of the stones within the soils can be divided into 4 stages. The numerical simulated of repeating tampings agrees reasonably well with the experimental results in terms of hammer velocity, displacement and acceleration.
- dynamic replacement method /
- impact dynamics /
- replacement pier /
- deformation of gravel mass /
- forming process /
- numerical simulation

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参考文献(21)

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