On the basis of elastic-plastic damage model of cement consolidated soil,the authors took organic contents into reasonable damage variable evolution equation in order to seek relation between the organic contents and parameters in the equation,and established the elastic-plastic damage model of cement consolidated soil considering organic contents.The results show that the parameters change correspondingly with difference of the organic contents.The higher the organic contents are,the less the valves of the parameters such as elastic modulus(E),material parameters(K,n) and damage evolution parameter(ε) become,but the larger strain damage threshold value(εd) of the sample is.Meanwhile,the calculation results obtained from established model are compared with the test data in the condition of common indoors test,which is testified with reliability.
In China,seasonal frozen soil is widely distributed.The freezing damage of subgrade soil in Jilin Province has been one of major engineering geological problems troubling the safety of road,in which some common damage phenomena,such as frost heave,subsidence deformation and frost boiling,are all caused by water translocation.Aiming at the phenomenon,the changes of moisture content of seasonal frozen soil in Changchun City are mainly studied by long-term field observation and indoor testing of physical properties under different conditions,and then the variation characteristics of moisture content in soil under different compactness and temperature conditions are realized.The results show that the increasing section of moisture content and negative temperature section all lie in 0.0-1.0 m of subgrade.Both lowest air and earth temperature occur in January to February,and the most negative temperature ranges from-7 ℃ to-10 ℃.
