文档介绍：第 26 卷第 3 期岩石力学与工程学报 Vol. 26 No. 3
2007 年 3 月 Chinese Journal of Rock Mechanics and Engineering March,2007
红砂岩粗粒土流变工程特性试验研究
陈晓斌 1,张家生 1,封志鹏 2
(1. 中南大学土木建筑学院,湖南长沙 410083;2. 贵州深港中天建筑设计有限公司,贵州遵义 563000)
摘要:在自行设计的粗粒土单轴流变试验仪上,进行红砂岩粗粒土流变试验,分析红砂岩粗粒土的流变特性。流
变试验结果表明,在比较低的应力状态(轴向应力σ≤ MPa)下,红砂岩粗粒土表现出线性黏弹性;在较高的应
力状态(轴向应力σ> MPa)下,红砂岩粗粒土表现出非线性黏弹塑性。为描述红砂岩粗粒土的非线性黏塑性变形
特征,提出一个新的双曲线型黏塑性体,将双曲线型黏塑性体与 Burgers 流变模型串联,建立一个新的红砂岩粗粒
土非线性黏弹塑性 6 元件流变本构模型,该流变本构模型能很好描述红砂岩粗粒土的非线性流变特征。同时,通
过红砂岩粗粒土流变试验曲线,采用改进的最小二乘拟合方法确定该流变本构模型参数;流变试验曲线和该流变
本构模型的理论曲线进行对比,对比结果验证了该模型合理。
关键词:土力学;红砂岩粗粒土;路基填料;流变试验
中图分类号:TU 411 文献标识码:A 文章编号:1000–6915(2007)03–0601–07
EXPERIMENTAL STUDY ON RHEOLOGICAL ENGINEERING
PROPERTIES OF COARSELY GRANULAR RED SANDSTONE SOIL
CHEN Xiaobin1,ZHANG Jiasheng1,FENG Zhipeng2
(1. School of Civil Engineering and Architecture,Central South University,Changsha,Hunan 410083,China;
2. Guizhou Deep Harbor Zhongtian Architecture Design Co.,Ltd.,Zunyi,Guizhou 563000,China)
Abstract:In order to analyze the rheological properties of coarsely granular red sandstone soil in the highway
embankment engineering,a series of rheological experiments were conducted on the rheological device that was
developed by the authors. Through these rheological experiments,the rheological properties,the main factors
affecting the coarsely granular red sa