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循环荷载下饱和软黏土的累积塑性应变试验研究 预览 被引量:41

Cumulative plastic strain of saturated soft clay under cyclic loading
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摘要 通过以交通荷载为背景的饱和重塑软黏土室内不排水动三轴试验,研究了循环荷载作用下饱和重塑软黏土的累积塑性应变发展形态,可分为3种类型:稳定型、破坏型和临界型。根据稳定型累积塑性应变发展曲线特点,提出了饱和软黏土的稳定累积塑性应变方程,并通过试验结果分析了该方程中各拟合参数与动应力幅值、固结围压和静偏应力的变化规律,同时提出了求解无静偏应力条件下软黏土临界动应力的解析方法。通过动三轴试验结果,提出了含动应力幅值、固结围压、静偏应力和循环周次等影响因素的累积塑性应变拟合模型。 To evaluate the influence factors of cumulative plastic strain of saturated soft clay, the cyclic triaxial tests with stress-controlled are conducted to investigate the behaviors of soft clay subjected to cyclic loading. The research results include four aspects. Firstly, there are three types of cumulative plastic strain of saturated soft clay under cyclic loading, such as stable type, destructive type and critical type. Cumulative plastic strain of saturated soft clay increases with repeated load when dynamic stress is less than the critical dynamic stress. But the increasing rate slows down until it trends to a stable value. On the contrary, the strain increases quickly with repeated load until clay is destructive. Secondly, a new mathematical function, containing three parameters, is suggested to fit the curve of cumulative plastic strain of saturated soft clay versus repeated load under cyclic loading. The influence laws between parameters and dynamic stress are analyzed. Thirdly, based on the influence laws, a method for confirming the dynamic stress without static deviator stress is put forward. Finally, an empirical equation for cumulative plastic strain which derived from the mathematical function, containing dynamic stress, confining pressure, static deviator stress and repeated load is synthesized.
作者 张勇 孔今伟 郭爱国 李雄威 ZHANG Yong, KONG Ling-wei, GUO Ai-guo, LI Xiong-wei ( 1. State Key Laboratory of Geomeehanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, China)
出处 《岩土力学》 EI CAS CSCD 北大核心 2009年第6期 1542-1548,共7页 Rock and Soil Mechanics
基金 基金项目:国家自然科学基金资助项目(No:40772185) 岩土力学与工程国家重点实验室重点项目(No.SKLZ0803).
关键词 交通工程 软土 循环荷载 动三轴试验 累积塑性应变模型 动应力 静偏应力 临界动应力 traffic engineering soft clay cyclic loading dynamic triaxial test cumulative plastic strain model dynamic stress static deviator stress critical dynamic stress
作者简介 张勇,男,1981年生,博士,主要从事土动力学方面研究。E-mail:zy_giant@yahoo.com。
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