岩土力学2023，Vol.44Issue(12)：3370-3382,3511,14.DOI:10.16285/j.rsm.2023.0306
含砂量对砂-细粒混合土一维蠕变行为的影响
Influence of sand content on one-dimensional creep behavior of sand-fines mixtures
摘要
Abstract
In this study,one-dimensional consolidation creep tests were conducted to study the influence of sand content on the consolidation creep behavior of sand-fines mixtures in front of the check dams in the Loess Plateau of central Ningxia,and the influence mechanism of sand content on its creep properties was investigated according to the mercury intrusion tests.Drawing on the theoretical framework of the Yin-Graham isochronic elastic-viscoplastic model,an empirical creep model,which took into account the finiteness of creep under one-dimensional conditions and the attenuation of the creep coefficient,was developed to capture the stress-strain-time relationship of sand-fines mixtures.The results show that when sand content is less than 28.57％,there is a negative correlation between sand content and secondary consolidation coefficient and secondary consolidation deformation,and the creep behaviors of sand-fines mixtures are controlled by fine particles;when sand content is greater than 28.57％,the secondary consolidation coefficient and secondary consolidation deformation gradually increase with the increase in sand content,and the creep properties of sand-fines mixtures are similar to that of sandy soil.The predicted curves of the proposed model are in good agreement with the strain-time curves of one-dimensional creep tests,indicating that it is suitable for characterizing the creep characteristics of sand-fines mixtures under one-dimensional conditions.关键词
砂-细粒混合土/含砂量/一维固结蠕变/经验模型Key words
sand-fines mixtures/sand content/one-dimensional consolidation creep/empirical model分类
土木建筑引用本文复制引用
常留成,王红雨,王亚,曹静..含砂量对砂-细粒混合土一维蠕变行为的影响[J].岩土力学,2023,44(12):3370-3382,3511,14.基金项目
国家自然科学基金(No.41962016) （No.41962016）
教育部博士点基金(No.20136401110003) （No.20136401110003）
宁夏高等学校一流学科建设项目(No.NXYLXK2021 A03).This work was supported by the National Natural Science Foundation of China(41962016),the Doctoral Foundation of the Ministry of Education(20136401110003)and the First-class Discipline Construction Project of Ningxia Higher Education Institutions(NXYLXK2021A03). （No.NXYLXK2021 A03）
