摘要
为研究石灰固化粉土的小应变刚度特性,利用共振柱和弯曲元对固化土和素土开展了不同围压下的小应变刚度测试。试验结果表明,石灰处理后粉土的小应变刚度显著提高,相同围压下固化土和素土的最大剪切模量比值为1.69~2.59。素粉土和石灰固化粉土的小应变刚度具表现出非线性特征,不同围压下的G-γ衰减曲线符合Hardin-Drnevich模型。固化土和素土的最大剪切模量和围压具有较强的线性相关性,并且固化土的刚度对围压的敏感性高于素土。研究还发现,采用共振柱和弯曲元得到的最大剪切模量非常接近。建议工程实践中采用弯曲元快速准确测定固化粉土的小应变刚度特征。本研究有助于对深化加固土的小应变刚度特性的理解,并为有关粉土的加固工程提供施工设计参数和理论指导。
A series of resonant-column and bender elements tests are performed with an aim of investigating the small-strain stiffness characteristics of lime-treated under different confining pressures.The test results show an apparent increase in Gmaxafter lime-treating and the ratio of G max for treated soil and untreated silt ranges between1.69 and 2.59.The small strain stiffness is found to attenuates nonlinearly with the increase of shear strain and the G-γcurves under different confining pressures are in accordance with Hardin-Drnevich model.Linear correlation relationship is found between Gmaxand confining pressure and the stiffness of the treated soil is more sensitive to the increase of confining pressure.The study also found that the maximum shear modulus obtained using the resonant cylinder and the bending element is very close.It is therefore suggested that bending element be adopted to determine the small strain stiffness of soil.This study can enhance the understanding of the small-strain stiffness characteristics of lime-treated soils,as well as provide critical parameters and theoretical guidance for related construction.
作者
袁振霞
付英杰
李新明
尹松
Yuan Zhenxia;Fu Yingjie;Li Xinming;Yin Song(School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou,Henan 450007,China;Research Center of Environmental Geotechnical Engineering and Underground Engineering Disaster Control Engineering of Henan Province,Zhengzhou 450007,China)
出处
《建筑科学》
CSCD
北大核心
2020年第7期99-105,共7页
Building Science
基金
国家自然科学基金(No.51509274
No.51608548
No.51574296)
河南省科技厅科技攻关项目(202102310529)
2019年度河南省高等学校青年骨干教师(No.2019GGJS142)
河南省自然科学基金项目(No.182300410161)。
关键词
石灰固化粉土
小应变刚度
共振柱
弯曲元
最大剪切模量
围压
lime-treated silt
small strain stiffness
resonant column
bender element
maximum shear modulus
confining pressure
