关键词: 等级公路, 地下水, 路基, 路面结构

Abstract: The mechanics problems of a roadbed and pavement structure of a classified highway in a water net plain district were studied. Through the limited element method, the force influence zone of the roadbed under a heavy load circumstance was calculated, and the mechanical response of the pavement structure on a higher water table was analyzed. The roadbed supportability under different compactness and the water content circumstances was experimentally  studied. The forceinfluenced zone of the roadbed is over 2 meters under the heavy load circumstance so that  the roadbed height of the existing classified highway is not serious enough and that there is a much deeper area below ground within the force influence zone. Because of elastoplasticity variation of the soil, the elastic modulus of the Yellow River alluvial (silting) soil can not reflect the bearing capacity of a roadbed in a high water content situation. Under the standard axle load condition, the deflections of the road surface have reached to 34.07mm and exceeded the design value. The high water table gives much important influence to the fatigue life of the base and the sub-base, especially the subbase. Corresponding project countermeasures were put forward.

Key words: the classified highway, groundwater, roadbed, pavement structure