网纹红土蠕变应变率试验研究  

Experimental research on creep strain rate of reticulate red clay

作　　者：何玉荣 李建中[2] He Yurong;Li Jianzhong(School of Civil and Environmental Engineering,Hunan University of Science Engineering,Yongzhou 425199,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)

机构地区：[1]湖南科技学院土木与环境工程学院,湖南永州425199 [2]中南大学地球科学与物理信息学院,湖南长沙410083

出　　处：《山西建筑》2021年第19期67-69,共3页Shanxi Architecture

基　　金：国家自然科学基金项目(50979117);湖南省自然科学基金项目(07JJ6087)。

摘　　要：蠕变应变率是判断蠕变变形所处阶段与发展趋势的重要依据。为了研究网纹红土蠕变应变率的变化规律,对网纹红土未扰动土样进行了分别加载条件下的初始加载、卸载、重复加载蠕变试验,并根据试验结果分析了蠕变应变率与蠕变时间、应力水平之间的关系。分析结果表明网纹红土的蠕变应变率随蠕变时间指数衰减;蠕变应变率随时间变化的曲线与蠕变应力水平相关。同时建立了蠕变应变率与蠕变时间、应力水平之间的函数关系式,并给出了求解蠕变应变率与蠕变时间、应力水平函数关系中相关参数的方法,最后还利用求得的参数对网纹红土的蠕变应变率进行了拟合。Creep strain rate is the most important factors to determine the stage of creep deformation and development trend of the creep of clay.In order to study the creep strain rate of reticulate red clay,creep tests of und isturbed reticulate red clay samples were performed under primary loading,unloading and reloading.Test results show that creep strain rate of reticulate red clay decays exponentially with creep time,creep strain rate versus time curve associates with the creep stress level.Creep constitutive equation of reticulate red clay was presented,in which the relationship between creep strain rate and creep time,creep stress level are quantified.Analysis results show that the creep constitutive equation can be used to calculate creep strain rate of reticulate red clay.

关 键 词：网纹红土 应变率 蠕变试验 

分 类 号：TU411.3[建筑科学—岩土工程]