加载与干湿循环作用下土石混合料蠕变特性试验  

Creep characteristics test of soil-rock mixture subjected to loading and dry-wet cycles

作　　者：孙晨峰 王步雪岩 钱建固[1,2] 王家超 张甲峰 SUN Chen-feng;WANG Bu-xue-yan;QIAN Jian-gu;WANG Jia-chao;ZHANG Jia-feng(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Shanghai CAAC New Era Airport Design&Research Institute Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海民航新时代机场设计研究院有限公司,上海200335

出　　处：《岩土力学》2024年第1期226-234,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51238009);中央高校基本科研业务费专项资金(No.22120190220)。

摘　　要：土石混合料在干湿循环作用下具有显著的蠕变性,其对高填方工程蠕变变形的影响不可忽略。为了研究了不同干密度及荷载水平对土石混合料湿化蠕变变形的影响,开展了9组土石混合料干湿循环作用下的压缩蠕变试验。结果表明,土石混合料的湿化蠕变变形随荷载水平的提高而增大,随干密度的提高而显著减小,但随着干密度进一步提高,湿化蠕变变形的减小幅度则明显弱化。土石混合料在干湿循环作用下的湿化蠕变变形与干湿循环次数对数之间较好地满足线性发展规律,初次湿化应变及湿化蠕变速率均同荷载水平及干密度之间符合幂函数特征,在此基础上提出了考虑不同干密度及荷载水平的土石混合料干湿循环蠕变经验模型。The study focused on investigating the influence of dry density and load level on the wetting creep deformation of soil-rock mixture.A total of 9 groups of compression creep tests were conducted on the soil-rock mixture under a dry-wet cycle.The results revealed that the wetting creep deformation of the soil-rock mixture increased with higher load levels and decreased significantly with increasing dry density.However,as the dry density further increased,the decrease in wetting creep deformation became less pronounced.The relationship between wetting creep deformation and the logarithm of the number of dry-wet cycles followed a linear development pattern for the soil-rock mixture under the dry-wet cycle conditions.The initial wetting strain and wetting creep rate were found to have power function distribution relationships with the load level and dry density.Based on these findings,an empirical model for the dry-wet cycle creep behavior of the soil-rock mixture was proposed.This model takes into consideration different dry densities and load levels,providing a framework for predicting and understanding the creep deformation of the soil-rock mixture under such conditions.

关 键 词：填筑土 土石混合料 干湿循环 蠕变 干密度 

分 类 号：TU411[建筑科学—岩土工程]