Long-term characterising plastic behavior of thawed subgrade clay under cyclic loads

被引：0
|
作者：
Zhang Z. [1 ,2 ]
Fu W. [3 ]
Zhang J.-H. [1 ,2 ]
Huang C. [4 ]
机构：
[1] School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha
[2] National Engineering Research Center of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha
[3] CCCC Second Highway Consultants Co.，Ltd., Wuhan
[4] School of Civil Engineering, Central South University, Changsha
来源：
Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) | 2023年 / 53卷 / 06期
关键词：
critical dynamic stress; dynamic triaxial tests; freeze-thaw cycles; permanent deformation; road engineering; subgrade soils;
D O I：
10.13229/j.cnki.jdxbgxb.20221550
中图分类号：
学科分类号：
摘要：
The effects of the number of freeze-thaw cycles was used the method of indoor test and the stress level on the static shear strength and plastic deformation soil were investigated. The results show that the static shear strength decreases with the decrease of confining pressure and the accumulation of freeze-thaw cycles， and the permanent deformation gradually develops from plastic stability to plastic creep or incremental instability when the dynamic stress level increases. Based on the comprehensive analysis of the test results，the critical stress level to avoid the instability of permanent deformation and the discrimination criteria of each type are defined，a description formula of critical dynamic stress considering confining pressure and freeze-thaw cycles is proposed，and the ratio of shear stress generated by dynamic stress to shear strength is used to represent shear action，and a mechanical-empirical model suitable for permanent deformation of subgrade clay subjected to freeze-thaw cycles was established and verified. The results of the study can provide theoretical support for the stability and durable operation of the subgrade in the monsoon freeze zone. © 2023 Editorial Board of Jilin University. All rights reserved.
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页码：1790 / 1798
页数：8
相关论文
共 29 条
  • [1] Zhang Jun-hui, Zhang An-shun, Li Jue, Et al., Gray correlation analysis and prediction on permanent deformation of subgrade filled with construction and demolition materials, Materials, 12, 18, (2019)
  • [2] Yang Jia-qiang, Cui Zhen-dong, Influences of train speed on permanent deformation of saturated soft soil under partial drainage conditions, Soil Dynamics and Earthquake Engineering, 133, (2020)
  • [3] Gu Chuan, Wang Jun, Cai Yuan-qiang, Et al., Undrained dynamic behaviors of saturated clays under compressive stress paths considering cyclic confining pressure, Chinese Journal of Geotechnical Engineering, 35, 7, pp. 1307-1315, (2013)
  • [4] Lu Zheng, She Jian-bo, Wu Xiao-wen, Et al., Cumulative strain characteristics of compacted soil under effect of freeze-thaw cycles with water supply, Transportation Geotechnics, 21, (2019)
  • [5] Monismith C L, Ogawa N, Freeme C R., Permanent deformation characteristics of subgrade soils due to repeated loading, Transportation Research Record, 537, pp. 1-17, (1975)
  • [6] Chai J C, Miura N., Traffic-load-induced permanent deformation of road on soft subsoil, Journal of Geotechnical and Geoenvironmental Engineering, 128, 11, pp. 907-916, (2002)
  • [7] Long Yao, Zhang Jia-sheng, Ding Jian-yuan, Et al., The cyclic load experiments and an accumulated deformation model for coarse-grained soil filling, Journal of Vibration and Shock, 36, 16, pp. 128-133, (2017)
  • [8] Lin Bo, Zhang Feng, Feng De-cheng, Et al., Accumulative plastic strain of thawed saturated clay under long-term cyclic loading, Engineering Geology, 231, pp. 230-237, (2017)
  • [9] Werkmeister S, Dawson A, Wellner F., Pavement design model for unbound granular materials, Journal of Transportation Engineering, 130, pp. 665-674, (2004)
  • [10] Gu Fan, Zhang Yu-qing, Luo Xue, Et al., Characterization and prediction of permanent deformation properties of unbound granular materials for pavement ME design, Construction and Building Materials, 155, pp. 584-592, (2017)
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