非饱和网纹红土比例加载特性研究
投稿时间:2020-07-19  修订日期:2020-11-07  点此下载全文
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作者单位E-mail
徐有娜 建设综合勘察研究设计院有限公司 1083564480@qq.com 
李建中 中南大学 地球科学与信息物理学院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:本文利用应力控制式全自动GDS静三轴仪对含水率相同、干密度相同重塑网纹红土进行分级加载条件下不同恒应力比路径、不同基质吸力的三轴固结排水试验,研究了非饱和网纹红土比例加载特性。研究结果表明:在比例加载条件下,非饱和网纹红土的基质吸力平衡过程中,反压排水量有一个明显的转折点,此转折点可作为判断基质吸力是否到达平衡的时间点;通过比较不同基质吸力下的轴向应变和时间的关系曲线发现,基质吸力的增加引起轴向应变增加;在偏应力保持不变的条件下,基质吸力的增加没有引起轴向应变的明显增加;不同基质吸力下的偏应力和净平均应力呈直线关系,其斜率近似为恒应力比;提出一种可以预测非饱和网纹红土比例加载条件下的径向应变的方法。
中文关键词:非饱和土  网纹红土  恒应力比  应变
 
Research on Proportion Load Characteristics of Unsaturated Reticulate Red Clay
Abstract:Consolidated drained triaxial tests were performed on the specimens of remolded reticulate red clay from the Dongting lake area with stress control type automatic GDS static triaxial apparatus. The remolded specimens have the same moisture content and dry density. The tests were in the step-load condition of different constant stress ratio path and matrix suction. Characteristics on unsaturated reticulate red clay under proportion load could be researched. The research results show that: An obvious turning point exists in the process of the balanced time of matrix suction of unsaturated reticulate red clay during the condition of the proportional load. When judging the balanced time of matrix suction through the turning point, the time of balance will be greatly shorten; Through comparing axial strain-time curve under different matrix suction, axial strain increases with the increasing of matrix suction; When deviatoric stress remains unchanged, the increasing of matrix suction has not brought to the axial strain increasing significantly; Curves of deviatoric stress-average effective stress under different matrix suction are in straight line. Its slopes are approximatively constant stress ratio; A new method can be put forward, which can predict the radial strain of unsaturated reticulate red clay soil under proportional loading conditions.
keywords:unsaturated soil  reticulate red clay  constant stress ratio, strain
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