A theoretical model and verification of soil column deformation under impact load based on the Duncan-Chang model

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Huang Jianqiu, Jin Zhuo, Wang Haiping, Ling Tao, Peng Xuejun, Tang Yu, Liu Qin, Li Xi
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引用次数: 0

Abstract

The dynamic compaction method has been widely adopted in foundation treatment to densify the soil fillers. However, for the complexity of the impact behavior and soil mechanical properties, the theoretical research of dynamic compaction lags behind its practice for complex soil properties and stress paths. This paper presents a theoretical model applied to describe soil column plastic deformation under impact load. The relationship among stress increment, strain increment, and plastic wave velocity was derived from the aspect of propagation characteristics of stress waves in soil first. Combined with the Duncan-Chang Model, a one-dimensional theoretical model was established then. A numerical model was developed further to check the performance of the model. It showed that the deformation at the end of the soil column was mushroom-shaped. Both the axial and lateral deformation increased with the impact velocity. While some particles located at the side of the soil column end may splash under repeated impact. The theoretical deformations of the soil column were consistent with the experimental results both in the direction of axial and lateral.
基于邓肯-张模型的冲击荷载下土柱变形理论模型及验证
地基处理中广泛采用动压法对填土进行密实处理。然而,由于冲击行为和土体力学性质的复杂性,对于复杂的土体性质和应力路径,动力压实的理论研究落后于实践。本文提出了一个理论模型,用于描述土柱在冲击荷载作用下的塑性变形。首先从应力波在土体中的传播特性出发,推导出应力增量、应变增量和塑性波速度之间的关系。结合 Duncan-Chang 模型,建立了一维理论模型。为检验模型的性能,进一步建立了数值模型。结果表明,土柱末端的变形呈蘑菇状。轴向和侧向变形均随冲击速度的增加而增大。而位于土柱端部侧面的一些颗粒在反复冲击下可能会发生飞溅。土柱的理论变形在轴向和侧向均与实验结果一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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