Permanent deformation of subgrade induced by long-term truck traffic loading in seasonally frozen regions

被引：0
|
作者：
Zhang F. [1 ,2 ]
Lin B. [1 ]
Feng D. [1 ]
Ling X. [2 ]
机构：
[1] School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin
[2] School of Civil Engineering, Harbin Institute of Technology, Harbin
来源：
Zhang, Feng (zhangf@hit.edu.cn) | 2017年 / Harbin Institute of Technology卷 / 49期
关键词：
Long-term traffic loading; Permanent deformation; Predication formulation; Road subgrade; Seasonally frozen regions; Stress ratio;
D O I：
10.11918/j.issn.0367-6234.2017.03.019
中图分类号：
学科分类号：
摘要：
To determine permanent deformation and its accumulation characteristics of subgrade induced by long-term traffic loading in seasonally frozen regions, a calculation method is proposed based on the accumulative strain empirical of subgrade soil under cyclic loading. Then, a finite element model of base-subgrade-foundation was built, and the effects of truck type, rear-axial loading, running speed and the depth of subgrade on the stress ratio and permanent deformation in the normal and spring-thawed period are analyzed. The calculated results show that: the stress ratio decreases with the increasing of depth in the normal period, and the stress ratio in thawed soil is greater than frozen soil and normal soil. Six-axis truck could produce more permanent deformation than other four types truck. The stress ratio and permanent deformation increases with the increasing of the rear-axis loading and the thickness affected by freeze-thaw action. Stress ratio and permanent deformation decreases with the increasing of running speed. Furthermore, a prediction formulation of subgrade permanent deformation is proposed based on the above calculation results. © 2017, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
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页码：120 / 126
页数：6
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