Study On Modulus Of Resilience And Humidity Of Subgrade Seasonal Frozen Region

With our country’s infrastructure investment increased gradually to the west, inseasonal frozen region built and building high grade highway is increasing, at thesame time as the region’s rapid economic development, the traffic demand increasesgradually need to improve highway service level and establish economic, reliable,convenient, efficient transportation system for the economic development of thesearea.However, the road frost damage in the seasonal frozen area has been plagued thehighway construction,it is still an important problem. In seasonal frozen area,theoriginal water in the soil and the soil moisture from external migration to graduallydecomposed into ice, cause relative displacement between soil particles, so that thesoil volume produced. In spring the ice gradually decomposed into water, cause soilthaw settlement. The repeated freezing and thawing deformation cause subgrade tocrack, uneven, bulging, boiling and other diseases, impacting on the road service leveland the service life of highway seriously.And these diseases lead the safety problemsto the normal operation of road especially high grade highway, also add the extra costof road maintenance.A series of repeated freeze-thaw tests are conducted on seasonal frozen regionsubgrade soil under different water compensating state(open syestem、close system)，then the variation of the resilient modulus, moisture content space distribution withmoisture content, compaction degree and freeze-thaw repetitions are analyzed,evolution rules of seasonal frozen region subgrade soil modulus of resilience arerevealed, reduction coefficient of seasonal frozen region subgrade soil resilientmodulus is established.