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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第8期    总第312期    2020年8月

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文章编号:1672-7207(2020)08-2174-09
考虑干密度影响的红黏土蠕变特性及蠕变模型研究
李娜1, 2,陈昌富1, 2,朱世民1, 2,毛凤山1, 2

(1. 湖南大学 建筑安全与节能教育部重点实验室,湖南 长沙,410082;
2. 湖南大学 土木工程学院,湖南 长沙,410082
)

摘 要: 为深入研究密实度对红黏土蠕变特性的影响,制备不同干密度的红黏土试样,经等压固结后,利用改制的三轴蠕变试验装置开展排水三轴蠕变试验,获得不同干密度的红黏土分级加载全过程曲线,并采用“陈氏叠加法”将分级加载全过程曲线转化为分别加载曲线。根据Burgers蠕变模型参数的物理含义,结合部分蠕变试验曲线对模型参数进行辨识,确定不同干密度的红黏土试样Burgers蠕变模型参数;然后,通过确定Burgers蠕变模型参数与干密度及偏应力之间的经验关系,建立考虑干密度影响的Burgers蠕变模型,并利用此蠕变模型对未参与模型参数辨识的蠕变试验曲线进行预测。研究结果表明:本文建立的蠕变模型对不同干密度的红黏土蠕变曲线具有较好的预测效果。

 

关键词: 红黏土;三轴蠕变;干密度;Burgers模型

Research on creep characteristics and creep model of red clay considering effect of dry density
LI Na1, 2, CHEN Changfu1, 2, ZHU Shimin1, 2, MAO Fengshan1, 2

1. Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education, Hunan University, Changsha 410082, China;
2. College of Civil Engineering, Hunan University, Changsha 410082, China

Abstract:In order to study the influence of compactness on the creep properties of red clay, the red clay samples with different dry densities were prepared, and the triaxial creep test was carried out by using the modified triaxial creep test device after the isostatic consolidation. The whole process curves of red clay with different dry densities were obtained, and the whole process curves of the staged loading were transformed into the corresponding loading curves by using “Chen''''s loading method”. According to the physical meaning of the parameters of Burgers creep model, the Burgers creep model parameters of red clay samples with different dry densities were determined according to the partial creep test curves. Then, by determining the empirical relationship between the parameters of Burgers creep model and dry density and deviatoric stress, a modified Burgers creep model considering the influence of dry density was established.Finally,the established creep model was used to predict the creep test curves which were not involved in the model parameter identification. The results show that the improved Burgers creep model has good performance in the prediction of red clay creep curves with different dry densities.

 

Key words: red clay; triaxial creep; dry density; Burgers model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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