Application Of Finite Element Methed For Geosynthetic Reinforcement Pavements Under Dynamic Loading

With the continuing rapid development of the national economy, the highway traffic plays a important role in the national economy and people's life ,and make to be a mark to measure a country's economic strength and level of modernization. Attendant problems are the injury of the asphalt pavcment structure becoming more and more seriously. Whether the asphalt pavement of the flexible base,or old concrete pavement with paving asphalt pavement, Rutting and cracking are the important factor of affecting pavement performance.In order to improve the pavement performance, promote the carrying capacity and prolong the service deadline, some techniques must be taken to pavement renovation. Using geosynthetic Reinforcement pavement is a common effective technique for pavement renovation. It can restrict to displacement of asphalt mixture particle,reduce stressing concentration, enhance the anti-fatigue properties of pavement ,delay development of cracking .Currently, the research of our country on structure type, design method and construction technique of grid interlay under dynamic loading are also few. It was necessary to do this. This thesis have been thoroughly and systematically extending the research on the mechanics analysis of grid interlay, analysis of the causes of pavement damage, then research on the measures of crack-resistant . All of those will be help of pavement design. The primary contents are as follows:(1) Based on linear elasticity theory, establish the three-demension model, the influence of parameters like thickess, modulus, and position of grid interlay in asphalt pavement of the flexible base is studied. Especially , the influence to rutting are emphatically analyzed.(2) Explore the best position of grid interlay in the overlay structure of old asphalt pavement. Using finite element software analysis influence regularity of interlining position to stress and strain of overlay structure, and calculate fatigue life of overlay structure on different situations.(3) Based on above research, Analysis the influence of cracking and relations between layers in the old concrete pavement to the best position of grid interlay.Study the role of grid interlay in the overlay structure of old concrete pavement to reduce reflection crack.