部分排水条件下饱和红黏土循环试验研究

发布时间：2018-01-22 08:38

本文关键词： 红黏土循环应力比平均初始固结压力初始固结应力比累积应变模型　出处：《浙江大学学报(工学版)》2017年07期 　论文类型：期刊论文

【摘要】：为了研究交通荷载作用下路基天然黏土层的长期动力特性,采用GDS循环三轴系统,对赣南地区的路基红黏土开展部分排水条件下大次数循环荷载试验.研究部分排水条件下红黏土的孔压累积和模量变化情况,分析循环应力比、平均初始固结压力、初始固结应力比对红黏土累积变形的影响.研究结果表明,红黏土的最终竖向累积变形随循环应力比和初始固结应力比的增大而指数型增大,随平均初始固结压力的增大而线性增大,提出考虑循环应力比、平均初始固结压力、初始固结应力比和循环次数的累积应变模型,通过不同动应力状态下红黏土累积应变随循环次数发展曲线的归一化表明了该累积应变模型的正确性.
[Abstract]:In order to study the long-term dynamic characteristics of Subgrade under traffic load natural clay layer, using GDS cycle three axis system, carry out the test of large number of cyclic loading under partially drained conditions of Gannan area of subgrade red clay. The cumulative pore pressure of red clay under partially drained conditions and modulus change analysis, cyclic stress ratio, average the initial consolidation pressure, initial consolidation effect of accumulated deformation ratio of the red clay. The results show that the ultimate vertical red clay cumulative deformation with the increase of the cyclic stress ratio and initial consolidation stress ratio and the exponential increase with the increase of the average initial consolidation pressure linearly, considers the cyclic stress ratio, average the initial consolidation pressure, initial consolidation stress ratio and cyclic times the cumulative strain model, through different dynamic stress under the condition of red clay cumulative strain with cycle number curve normalized table It is clear that the cumulative strain model is correct.

【作者单位】：上海大学土木工程系;江西理工大学建筑与测绘工程学院;江西省环境岩土与工程灾害控制重点实验室;
【基金】：国家自然科学基金资助项目(ZXLG20140030)
【分类号】：U416.16
【正文快照】： 3.江西省环境岩土与工程灾害控制重点实验室,江西赣州341000)红黏土为碳酸盐岩在热带、亚热带湿热气候条件下经过物理、化学分化和红土化作用形成的一种褐红、棕红等颜色的黏性土体,广泛分布于我国南方云贵高原、四川东部、两湖两广等地区,具有高含水率、高塑性、低渗透性、低

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