摘要
为探究细粒含量对饱和砾性土静动力学特性的影响,通过一系列砾性土固结排水三轴剪切试验及多级加载下固结排水动三轴试验,分析了细粒含量对饱和砾性土静力特性(应力-应变曲线、静体积应变)、动力特性(轴向累积应变、回弹模量、动体积应变)的影响规律。结果表明:细粒含量的增加导致砾性土的峰值强度不断减小,但能够有效约束试样的剪胀变形,细粒含量15%时对应的静体应变终值相比于细粒含量0%时减小了27.09%。随着细粒含量的增加,饱和砾性土轴向累积应变逐渐增大,而回弹模量随细粒含量的增加而减小;饱和砾性土轴向累积应变与振次的关系曲线符合单对数模型。
In order to explore the influence of the content of fine particles on the static and dynamic characteristics of saturated gravelly soils,a series of consolidation and drainage triaxial shear tests of gravelly soil and consolidation and drainage dynamic triaxial tests under multi-stage loading were carried out to analyze the influence of fines content on the static characteristics(stress-strain curve,static volume strain)and dynamic characteristics(axial cumulative strain,elastic modulus,dynamic volume strain)of the saturated gravel soil.The research results show that the increase of fines content will decrease the peak strength of gravelly soil,but it can effectively restrain the dilatancy deformation of the sample.The final static strain corresponding to 15%fines content is decreased by 27.09%compared with that with 0%fines content.The axial cumulative strain of saturated gravelly soil gradually increases with the fines content,while the elastic modulus decreases with the fines content.The relationship between the axial cumulative strain and the vibration frequency of saturated gravelly soil conforms to the single logarithmic model.
作者
王家全
祝梦柯
林志南
梁宁
Wang Jiaquan;Zhu Mengke;Lin Zhinan;Liang Ning(Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control,Liuzhou 545006,China;Guangxi University Key Laboratory of Disaster Prevention and Mitigation and Prestress Technology,Liuzhou 545006,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第5期112-121,共10页
China Civil Engineering Journal
基金
国家自然科学基金(41962017)
广西自然科学基金重点项目(2022GXNSFDA035081)
广西高等学校高水平创新团队及卓越学者计划(桂教人才[2020]6号)
广西研究生教育创新计划项目(YCSW2020222)。
关键词
道路工程
砾性土
细粒含量
力学特性
多级加载
road engineering
gravel soil
fines content
mechanical properties
multi-stage loading
