交通荷载下路基土动应力应变累积的特性  

Accumulated Behavior of Subgrade Clay under Traffic Loading

作　　者：汤连生[1] 张庆华[1] 尹敬泽 吴玉刚 廖化荣[1] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]广东省高速公路有限公司,广东广州510600

出　　处：《中山大学学报（自然科学版）》2007年第6期143-144,共2页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(50279056);广东省自然科学基金资助项目(07003738);广东省科技计划重点资助项目(2004B32801002)

摘　　要：采用模型试验、循环荷载单轴压缩试验及原位监测试验与理论分析相结合的方法,研究了交通荷载下路基土动附加应力的时空分布规律,提出了路基土动附加应力累积效应的概念,探讨了动附加应力累积与荷载次数、荷载频率、动附加应力水平及深度的关系,分析了交通荷载下路基土塑性应变行为。由此得出动应力累积随加载次数的增加而增大,随深度的增加渐趋平缓,并确定了红黏土的临界应力水平为50%,建立交通荷载下路基土动附加应力量化模型和永久变形量化模型。最后,给出了交通荷载下路基土工后沉降的3种组成模式及其相关控制技术。Based on the model test, repeated loading test and prototype monitoring, the accumulated behavior, shakedown, hysteretic and plastic behavior of cohesive subgrade soil were studied under traffic loading. According to the test results, the factors that contribute to various mechanic behaviors of subgrade soil are analyzed in detail. In addition, the study presents discussion on stress-strain relation, accumulated behavior and plastic deformation model of subgrade red clay with deformation principle. The mechanism of permanent deformation is explained in light of shakedown and hysteretic behavior.

关 键 词：交通荷载 路基土 动应力 永久变形 累积效应 工后沉降 

分 类 号：TU431[建筑科学—岩土工程]