2015•Journal of China University of Mining and TechnologyRequires access
Thaw settlement and compression properties of silty clay under freeze-thaw circle of double direction freezing-one direction thawing
Yin Qi-xian
Open publisher page 3 citations
Abstract
Freeze-thaw circle tests of silty clay were carried out,which is based on the upper boundary freezing temperature freeze-thaw circle experimental device.The results show that,with the increase of freeze-thaw cycle times,samples under warm freezing temperature freezethaw cycle present mainly compaction,the same as samples whose dry densityρd≤1.42g/cm3 under low freezing temperature freeze-thaw cycle.However,samples whose dry densityρd1.42g/cm3 under low freezing temperature freeze-thaw cycle present mainly expansion.Compared with the first freeze-thaw cycle,thaw settlement coefficient α0 of samples after the second warm freezing temperature freeze-thaw cycle decreased greatly.However,α0 increased after low freezing temperature freeze-thaw cycle,and α0 tended to be a stable valueα 07 with the increase of freeze-thaw cycle times.Furthermore,α07increased with the increase of upper boundary freezing temperature.When upper boundary freezing temperature higher than-2.8℃(in-clude-2.8 ℃),melted soil compression coefficient mvof different densities all decreased after one freeze-thaw cycle.However mvof densitiesρd≥1.42g/cm3 increased,and mvof densitiesρd1.42g/cm3 decreased after one freeze-thaw cycle.mvincreased and tended to be a stable value mv7 with the increase of freeze-thaw cycle times,and mv7 increased with the decrease of upper boundary freezing temperature.