摘要
为了探讨不同细粒含量砂土多次液化的动力特性,将理论配比黏土和细砂的混合土样、从现场采集的未扰动的原状试样及其重塑试样,进行一系列的三轴液化试验,对试样均进行3次液化试验后分析其强度特性。结果表明:(1)液化强度随着细粒含量增加而减少,与液化历史次数无关;(2)液化过程中,试样密度(压实度)的增量随着细粒含量的提高而增大;(3)液化强度和剪切模量在第2次液化显著下降,而试样压实度随着液化历史的增加而增加,但在第3次液化试验仅略微增加;(4)每个试样的剪切模量和液化强度之间有很好的相关性,与原状和重塑状态无关,是材料固有的特性。
In order to investigate the dynamic characteristics of multiple liquefaction of sand with different fine content,a series of triaxial liquefaction tests were carried out on the mixed soil samples of theoretically proportioned clay and fine sand,undisturbed samples and reshaped samples collected from the field,and the strength characteristics of the samples were analyzed after three liquefaction tests.The results show that:①The liquefaction strength decreases with the increase of fine particle content,and has nothing to do with the historical times of liquefaction;②During the liquefaction process,the density increment of the sample increases with the increase of fine particle content;③The liquefaction strength and shear modulus decreased significantly at the second liquefaction,while the compactness of the sample increased with the increase of liquefaction history,but only slightly increased at the third liquefaction test;④There is a good correlation between the shear modulus of each sample and the liquefaction strength,which is independent of the original or reshaped state,showing the inherent relationship of the material.
作者
赵伟
史浩栋
范冠宇
宋毅
张建忙
ZHAO Wei;SHI Haodong;FAN Guanyu;SONG Yi;ZHANG Jianmang(Geological Environment Exploration Institute of Jiangsu Province,Nanjing 211102,China;Geo-engineering Investigation Institute of Jiangsu Province,Nanjing 211102,China)
出处
《河南科学》
2025年第4期576-585,共10页
Henan Science
基金
江苏省省级地质勘查专项资金项目(苏财资环[2020]20号,苏财资环[2022]27号)。
关键词
砂土液化
多次液化
三轴液化试验
剪切模量
sandy soil liquefaction
multiple liquefaction
triaxial liquefaction test
shear stiffness
