摘要
在自然条件下,降雨等作用使得红黏土中游离氧化铁的含量减少,从而影响土体的压缩性,因此有必要研究脱铁后红黏土的压缩固结特性。用DCB法将红黏土脱铁,进行压缩固结实验,研究结果表明:土体的孔隙比随着压力的增大而减小,且趋于一个稳定值;压缩指数和100~200k Pa压力段的压缩模量随压实度的增加而增大,压缩系数随压实度的增加而减小;固结系数随压力的变化在整体上有减小的趋势,呈震荡式变化,且基于时间对数法计算得到的固结系数要比基于时间平方根法得到的大很多;变形量随时间的增加而增大,超过一定时间后,变形量的变化速率特别小,在相同的时间内,变形量随着压实度的增加而减小。
Under natural conditions,rainfalls make the content of free iron oxide in red clay decrease,which affects the compressibility of soil. Therefore,it is necessary to study the compression and consolidation properties of red clay after iron removal. DCB method is used to remove the iron from red clay and carry out compression and consolidation experiments. The results showthat the soil porosity ratio decreases with the increase of pressure,and tend to a stable value. Compression index and compression modulus of100-200 k Pa pressure increases with the increase of the degree of compaction,but the compression coefficient decreases. Consolidation coefficient has a shock change and a decreasing trend on the whole pressure.The coefficient of consolidation calculated by the time logarithm method is much larger than that based on the time square root method. Deformation increases with the increase of time. After a certain time,the change of deformation is very small. At the same time,the deformation decreases with the increase of the degree of compaction.
作者
陈明
王月中
CHEN Ming;WANG Yuezhong(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001)
出处
《常州工学院学报》
2018年第3期1-5,共5页
Journal of Changzhou Institute of Technology
基金
国家自然科学基金项目(41302226)
江苏省第五期"333工程"培养资金资助项目(BRA2017124)
常州工学院科研基金项目(YN1501)
关键词
红黏土
氧化铁
DCB法
压缩固结
red clay
iron oxide
DCB method
compression ＆ consolidation
