Study On The Roadbed Seepage And Drainage Measures In Highland Meadows Area Of Sichuan-Tibet Highway

Highland meadows area belong to seasonal frozen soil, natural condition is complex,poor drainage, water move is the primary cause of roadbed intensity change,subgrade bearingcapacity and the deformation. From the internal law of water cycle of roadbed Angle andcombining with the actual engineering project, this thesis studied the highland meadows areainternal seepage rule and drainage problems relying on the reconstruction projects ofChuanCangXian kangding-ease los period highway. It has important meaning for providingtechnical reference to improve drainage system and guide the seasonal frozen earth area roaddesign or engineering construction.Considering various factors synthetically, we select three typical sections for sitemonitoring. On the basis of the analysis of field monitoring data, we can obtain the influenceof the road foundation seepage field on the terrain, water temperature and route toward.Andpoint out the the problems of roadbed internal drainage.Based on similarity law and Darcy’s law, we have experimented several simple boundaryconditions seepage tests in different height head of the soil roadbed and blind ditch roadbedabout the typical sections B by using ourselves’ roadbed seepage models.we can obtain theseepage rule of vertical and horizontal roadbed internal and suggestions of drainageimprovement.Under the model test and field monitoring analysis, we use finite element softwareADINA to solve seepage unit by heat conduction, utilizing percolation equation and thetemperature equation have the similar principl.Get roadbed seepage distribution law underdifferent working conditions and mainly to simulate several kinds operating conditions suchas whether have the blind ditch, change its size and permeability coefficient.Comprehensive site, the model test and numerical simulation, we summarize seepagefield distribution and improved drainage measures of embankment about plateau meadow fill.The result of this paper would put forward design reference for seasonal frozen earth roadbedof sichuan-tibet plateau in kangding area future.