Application Of Impact Compaction Technology In Highway Subgrade

Subgrade is an important part of the pavement structure. in some ways, subgrade have decisive function on strength and stiffness of pavement structure. Since our country introduced the impact compaction technology in 1959. Compared with the traditional static pressure construction, The new construction machinery has obvious advantages for low frequency, high amplitude and high impact energy. Mainly to improve the roadbed compaction effect and improved the subgrade modulus of resilience. And the improvement of subgrade modulus of resilience to reduce the thickness of pavement structure, prolong the service life of road, reduce the project cost and so on all play a crucial role. Therefore, with the popularization and application of impact compaction technology in our country, based on high modulus of subgrade pavement structure also gradually recognized by the domestic scholars.At present, the liaoning province highway experience in application of impact compaction technique is not yet mature, this article will combine local typical asphalt pavement structure in liaoning province, on high modulus of subgrade, the mechanics response of asphalt pavement structure analysis for the application of impact compaction technology in liaoning province to provide scientific basis.In order to more comprehensive grasp compaction technology, This article will be discussed from four aspects as follows:1. By collecting domestic and foreign research achievements about the impact compaction technology and mechanism of impact compaction technique, analysis of impact compaction technique under different subgrade filling applicability.2. Combining with impact compaction technology in the highway construction in liaoning province engineering experience, discusses the influence of the subgrade of high modulus asphalt pavement structure. High modulus of subgrade were studied with finite element analysis software modeling under the changing rule of the asphalt pavement structure design parameters. Recommend a typical asphalt pavement structure.3. The recommended according to the asphalt pavement structure, paving test road. Testing data collection and analysis, validate the effects of impact compaction technology.4. comprehensive consideration road life, timeliness of construction cost analysis.Research results show that the improved soil foundation modulus can effectively reduce the bituminous pavement structure table deflection value and improve the various structural layers of the flexural stress; General subgrade treated by impact compaction technology, the thickness can be properly thinning 15～20 cm. In the light of the rubber asphalt mixture has good rutting resistance, fatigue resistance and stability of temperature stability, etc. We recommend a new type of asphalt rubber asphalt pavement structure with impact compaction technology promotion.