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| Dynamic characteristic analysis for the whole system of impact pile driver-pile-soil |
| YANG Shu-yi1, LI Huan1, CHEN Cang1, SHI Lin2 |
1. College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan New Timehope Construction Machinery Co., Ltd., Xiangtan 411200, China |
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Abstract It is the premise of the impact pile driver structural design that the impact phenomenon is understood thoroughly and analyzed scientifically. The dynamic characteristic analysis of impact pile diver is a complex dynamic problem involving geometric large deformation, material nonlinear and contact nonlinear. It is difficult to describe dynamic response of the system structure and interactions on the pile-soil using stress wave analysis method. The finite element model of the whole system of impact pile driver-pile-soil considering soil deformation was established using the ALE fluid-structure coupling algorithm based on ANSYS/LS-DYNA. The impact pile driver experimental test platform was built to get the stress wave time history curve of key points. The test curve verified the correctness of the finite element model. According to the stress distribution patterns of impact hammer, transmission box and pull rod, the stress conditions of the key components were analyzed and some suggestions for the construction design were put forward. The bearing capacity of precast pile bottom was discussed under different soil bulk modulus. These results provide theoretical basis for new structural design and applicable environment selection of impact pile driver.
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Received: 28 August 2015
Published: 28 April 2016
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新型冲击沉桩机-桩-土全系统动力学特性分析
对冲击碰撞现象进行充分的理解和科学分析是对冲击沉桩机进行结构设计的前提.冲击沉桩机动力学特性分析是一个涉及几何大变形、材料非线性和接触非线性的复杂动力学问题,采用应力波法难以对冲击系统结构的动态响应和桩土的相互作用进行描述.基于ANSYS/LS-DYNA分析软件,针对新型冲击沉桩机,考虑土体大变形,利用ALE流固耦合算法,建立冲击沉桩机-桩-土相互作用的全系统有限元模型.搭建冲击沉桩机实验测试平台,获得关键测点的应力波时程曲线,验证了有限元模型的正确性.依据冲击体、传力箱和拉杆的应力分布图,分析了各关键部件受力情况并提出结构设计建议.改变土体体积模量,获得了不同土体下的预制桩桩底端面承载力.研究结果为新型冲击沉桩机的结构设计和适用环境的选择提供了理论依据.
关键词：
冲击沉桩机,
全系统建模,
ANSYS/LS-DYNA,
ALE,
土体变形
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