Subgrade Soil Moisture Investigation And Drainage Experiment Study

Subgrade performance condition is one of the very important factors that affect cement concrete pavement service performance and damage types. The common disease of cement concrete pavement are crack,fracture plates,discontinuity of slabs,erosion of subbases arching and so on.The cause of cement concrete pavement disease are very complex,among them the status of subgrade stability and outside environment are very important reasons.This paper investigation and study on subgrade soil moisture of cement concrete pavement; take methods of field survey analysis,indoor experiment and numerical simulation,obtained the following research results:1. Analysed humidity source and influence factors of subgrade soil, based on the analysis arranged cement concrete pavement road disease type and subgrade status of compactness or moisture content through methods of collect data and field survey.Conclusion that water is a key factor of subgrade stability and the situation of roadbed have great influences on pavement service performance and damage types.2. Rely on practical engineering of JiNa road in HeiLongJiang province,tested and analysised the variation of temperature field and water field,analysised the effection of temperature field on moisture field.Holds that negative temperature is an important factor that affect the subgrade soil moisture field in frozen regions.3. Carried on indoor soil drainage experiment,make sure the drainage performance of pvc-drainage-pipe,and analysised the effect of pipe length and loads on drainage results.4. Used finite element methods,established indoor drainage testing model,verified the model's preciseness.Based on the small model,established mountain body soil drainage model of cut subgrade in mountain area,analysised the affect of different pipe length, inbuilt location and the row number of pipe on drainage results,finally analysied ifluences of rainfull intensity and mountain gradient on pipe arrange style.