摘要
以合肥某高速公路膨胀土为研究对象,利用GDS真动三轴仪对不同粉煤灰掺量与不同围压条件下的改良膨胀土进行分级荷载动力试验,研究改良膨胀土动弹性模量与阻尼比的变化规律。结果表明:掺入粉煤灰可以显著提高膨胀土的动弹性模量,当掺灰率小于10%时,改良土动弹性模量E_(d)及其峰值E_(dmax)随着掺灰率的增大而增大,当掺灰率大于10%时,改良土E_(d)与E_(dmax)随着掺灰率的增大而减小;改良土阻尼比λ随着围压的增大而增大,每50 kPa能提高5%~10%,但掺灰率对阻尼比无明显影响。
Taking the expansive soil of a certain expressway in Hefei as the research object,using the GDS true dynamic triaxial instrument to carry out the graded load dynamic test of the improved expansive soil under different fly ash content and different confining pressure conditions,the dynamic elastic modulus and The changing law of damping ratio is studied.The results show that mixing fly ash can significantly increase the dynamic elastic modulus of expansive soil.When the ash mixing rate is less than 10%,the modified soil dynamic elastic modulus E_(d) and its peak E_(dmax) increase with the increase of the ash mixing rate.When the ash mixing rate is greater than 10%,the E_(d) and E_(dmax) of the modified soil decrease with the increase of the ash mixing rate;the damping ratioλof the modified soil increases with the increase of the confining pressure,and it can increase by 5%every 50kPa~10%,but the ash mixing rate has no obvious effect on the damping ratio.
作者
孟靖
庄心善
周睦凯
周荣
MENG Jing;ZHUNG Xinshan;ZHOU Mukai;ZHOU Rong(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)
出处
《湖北工业大学学报》
2022年第2期70-74,共5页
Journal of Hubei University of Technology
基金
国家自然科学基金(51708190)。
关键词
膨胀土
粉煤灰
动三轴试验
动弹性模量
阻尼比
expansive soil
fly ash
dynamic triaxial test
dynamic elastic modulus
damping ratio