|Table of Contents|

Dynamic characteristics of soft soil under cyclic loading considering influence of different single loading durations(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年5期
Page:
30-39
Research Field:
道路工程
Publishing date:

Info

Title:
Dynamic characteristics of soft soil under cyclic loading considering influence of different single loading durations
Author(s):
HE Zhong-ming1;  WANG Pan-pan1;  ZHANG Wen-zhou1;  ZHONG Wei1;  SHU Qing-hai2
(1. School of Transportation Engineering, Changsha University of Science & Technology, Changsha 410114,Hunan, China; 2. Kunming Air Drop Construction Management Co. Ltd., Kunming 650000, Yunnan, China)
Keywords:
road engineering;  dynamic characteristics;  dynamic triaxial test;  cumulative deformation;  stiffness softening
PACS:
U416.16
DOI:
10.19721/j.cnki.1671-8879.2023.05.004
Abstract:
To study the dynamic properties of soft soil under cyclic loading with different single loading duration, dynamic triaxial tests of soft soil specimens were designed and carried out to analyze the cumulative deformation development and stiffness softening characteristics of soft soil under different perimeter pressures, dynamic load amplitudes, and dynamic loading durations. The effects of confining pressure, dynamic load amplitude, and loading duration on the cumulative deformation and stiffness softening characteristics of soft soil were investigated in terms of the strain-cycle curve and softening index-cycle curve. And an empirical model of cumulative deformation development and stiffness softening of soft soil was established by considering the effect of loading duration. The results show that the cumulative plastic strain of soft soil is negatively correlated with the confining pressure, and positively correlated with the dynamic load amplitude and dynamic load duration. There is an inflection point in the strain-cycle curve of the soil body, and the cumulative plastic strain develops rapidly when the cycle times are not loaded to the inflection point. The growth rate of the cumulative plastic strain is slowed down and tends to be stable after the cycle times are loaded to reach the inflection point. Soil stiffness softening index is positively correlated with the confining pressure, and negatively correlated with the dynamic loading amplitude and dynamic loading time. The stiffness softening index is bounded by the critical loading times. When the loading times are less than critical, the softening index decreases sharply, and the attenuation amplitude accounts for more than 70%. The empirical model of cumulative deformation development and stiffness softening of soft soil established in this paper considering the role of loading duration has high prediction accuracy.4 tabs, 11 figs, 31 refs.

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Last Update: 2023-10-10