吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (6): 1790-1798.doi: 10.13229/j.cnki.jdxbgxb.20221550

• 交通运输工程·土木工程 • 上一篇    

循环荷载下冻融路基黏土长期塑性行为

张哲1,2(),付伟3,张军辉1,2(),黄超4   

  1. 1.长沙理工大学 交通运输工程学院，长沙 410114
    2.长沙理工大学 公路养护技术国家工程研究中心，长沙 410114
    3.中交第二公路勘察设计研究院有限公司，武汉 430052
    4.中南大学 土木工程学院，长沙 410075
  • 收稿日期:2022-12-04 出版日期:2023-06-01 发布日期:2023-07-23
  • 通讯作者: 张军辉 E-mail:zzhe@stu.csust.edu.cn;zjhseu@csust.edu.cn
  • 作者简介:张哲（1997-），男，硕士研究生.研究方向：特殊路基设计与处治.E-mail：zzhe@stu.csust.edu.cn
  • 基金资助:
    国家重点研发计划项目(2021YFB2600900);中交建集团青年科技创新项目(2021-ZJKJ-QNCX16);长沙理工大学研究生科研创新项目(CX2021SS123)

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

Zhe ZHANG1,2(),Wei FU3,Jun-hui ZHANG1,2(),Chao HUANG4   

  1. 1.School of Traffic & Transportation Engineering，Changsha University of Science & Technology，Changsha 410114，China
    2.National Engineering Research Center of Highway Maintenance Technology，Changsha University of Science & Technology，Changsha 410114，China
    3.CCCC Second Highway Consultants Co. ，Ltd. ，Wuhan 430052，China
    4.School of Civil Engineering，Central South University，Changsha 410075，China
  • Received:2022-12-04 Online:2023-06-01 Published:2023-07-23
  • Contact: Jun-hui ZHANG E-mail:zzhe@stu.csust.edu.cn;zjhseu@csust.edu.cn

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摘要：

采用室内试验的方法，考察了冻融循环次数和应力水平对路基土静剪切强度和塑性变形的影响规律。结果表明：围压降低和冻融循环的累积导致路基土静剪切强度发生衰减，且当动应力水平升高时，路基土的永久变形逐渐由塑性安定向塑性蠕变或增量失稳状态发展。综合分析测试结果，明确了避免冻融路基土永久变形出现失稳状态的临界应力水平和各类型判别准则，提出了考虑围压和冻融循环次数的临界动应力描述公式，并以动应力产生的剪应力与抗剪强度的比值表征剪切作用，建立并验证了适用于冻融路基黏土永久变形的力学-经验模型。本文研究成果可为季冻区路基的稳定及耐久运营予以理论支持。

关键词: 道路工程, 临界动应力, 永久变形, 动三轴试验, 路基土, 冻融循环

Abstract:

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.

Key words: road engineering, critical dynamic stress, permanent deformation, dynamic triaxial tests, subgrade soils, freeze-thaw cycles

中图分类号: 

  • TU411

表1

静三轴试验破坏强度 (kPa)"

冻融循环次数围压/kPa
306090
0502.3642.2742.5
1474.6606.8701.6
3447.5572.2661.6
6427.9547.1632.6
10413.9529.2611.9

图1

永久变形试验结果"

图2

不同围压下临界动应力试验结果"

图3

不同冻融循环次数下临界动应力试验结果"

图4

临界动应力拟合结果"

图5

永久变形三状态判别准则"

表2

判别准则对比结果"

来源组类Shakedown理论判别结果Werkmeister准则判别结果本文判别准则判别结果
文献［8］1ACA
2BCB
3BCB
4BCB
5BCB
6CCC
7ACA
8ACA
9BCB
10BCB
11BCB
12BCB
文献［29］1ACA
2ACA
3BCB
4BCB
5ABA
6ACA
7ACB
8BCB
9ACA
10ACA
11ACA
12ACA

图6

不同偏应力下永久变形终值"

图7

不同围压下永久变形终值"

图8

不同冻融循环次数下永久变形终值"

图9

剪应力比示意图"

图10

永久变形预估模型合理性验证"

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