High Modulus Subgrade Asphalt Pavement Structure Application Technology Research

As the road foundation, subgrade is an important part of the structure for the pavement structure strength and rigidity. Impact compaction technology has used construction machinery for the high amplitude, low frequency with high impact energy compaction machine; compared with traditional methods of compaction construction, it can significantly improve the subgrade compaction effect and resilience modulus. Subgrade modulus has greater effects on reducing pavement thickness and lowing the project costs.Therefore with the impact compaction technology in our country extensive application, high modulus subgrade pavement structure has wide application prospects. It is quite necessary to analyse high modulus subgrade structure mechanics and study the reasonable thickness.Over all the paper consists of four parts:In the study of impact compaction technique based on the mechanism of the effect, puts forward impact compaction technology of different as subgrade filling the applicability is different. Impact compaction effect detect standard disunity, need with specific test results to determine.Based on the engineering experience of South Africa"Strong Foundation and Thin Pavement", which was used in the Liaoning coastal highway construction. Finite element modeling was used to study the change of the asphalt pavement design parameters when the subgrade with high modulus.Results indicate that subgrade with high modulus can effectively reduce deflection value of asphalt pavement and the tensile stress of bottom layers of the structure. When the modulus of subgrade is high, the thickness of subgrade can be appropriately reduced by 15~20cm, and rubber asphalt is used as pavement which makes road performance of new asphalt pavement structure better.Through the research of heavy duty, using finite element method to heavy duty under high modulus subgrade pavement structure mechanics calculation and analysis, Theory research shows that: Under the heavy duty Subgrade with high modulus can effectively reduce deflection value of asphalt pavement,It has good resistance to deformation ability and show lower axle load sensitivity.Study the high modulus subgrade entity engineering in Liaoning coastal highway construction and test pavement performance, verifies the high modulus subgrade construction of use effect. Economic benefit analysis show that impact compaction charges on higher than the traditional construction, but efficiency can save about two-thirds of the period.Finally, the paper work done is summarized, and to further research work is prospected...