期刊论文

Study on uniaxial creep characteristics and model of lacustrine soft soil

中文

湖南城市学院学报(自然科学版)

1672-7304

2023

32

03

1-7

10.3969/j.issn.1672-7304.2023.03.0001

2021JJ50142:湖南省自然科学基金项目 2022JJ50265:湖南省自然科学基金项目 202111527034:国家级大学生创新创业训练计划项目

本校为第一机构

通过长期单轴蠕变试验，获得了湖相软土在不同应力水平下的应力-应变-时间的关系曲线，据此研究该软土的蠕变变形特性；在此基础上，利用非线性牛顿黏壶代替广义西原模型中的线性牛顿黏壶，将其从一维泛化到三维应力空间，建立了改进广义西原模型；利用曲线拟合法确定蠕变模型参数，并对该模型进行数值模拟验证。结果表明：软土在加载的瞬时均有一定的瞬时变形，然后随时间的延长，变形也明显增加；当应力水平低于50 kPa时，土体蠕变变形以衰减蠕变为主，处于黏弹性阶段；当应力水平高于50 kPa时，土体出现了衰减蠕变和稳定蠕变，呈塑性，并进入黏塑性阶段；由于环刀的侧限作用，软土土样未出现...

Through long-term uniaxial creep test,the stress-strain-time relation curve of lacustrine soft soil under different stress levels was obtained,and the creep deformation characteristics of the soft soil were studied.On this basis,the nonlinear Newton dashpot was used to ...MORE Through long-term uniaxial creep test,the stress-strain-time relation curve of lacustrine soft soil under different stress levels was obtained,and the creep deformation characteristics of the soft soil were studied.On this basis,the nonlinear Newton dashpot was used to replace the linear Newton dashpot in the generalized...