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With the rapid development of China 's transportation , the proportion of large transport vehicles laden vehicle , while the vehicle is overloaded , overrun phenomenon is very serious , resulting in serious asphalt pavement early failure , affecting pavement performance and shorten the service life of the pavement . Therefore, the study on the design parameters of the asphalt pavement under heavy it is very necessary . Of Transportation 's investigation found the truck, overloaded vehicles has been increasing gradually , severe early failure of the pavement structure . Analysis of the reasons for early disease , as well as the existing pavement structure in Gansu . Referring to foreign research proposed the schema under heavy load , select a pavement design standard axle load . Selected design specifications for pavement design , the use of the existing models , namely the establishment of the surface deflection grassroots bottom tensile stress , tensile strain at bottom surface , the top surface of the soil base compressive strain rut equivalent axle load conversion formula . Overriding the following layer , grassroots , subgrade modulus values ??for mechanical analysis , to discuss the value of the modulus , and have use of pavement life summed modulus value . Resilient Modulus of experiments on several surface with the grass roots of the raw materials , summed up the relationship between the temperature of the surface layer modulus , the modulus of the surface layer and the relationship of the resistance to rutting . Base modulus , fatigue equivalent ideas under heavy research Modulus , accelerated load testing ground for grassroots modulus decay . Subgrade Resilient Modulus on the fatigue life of the pavement structure , as well as measures to improve the Subgrade Resilient Modulus , calculated resilient modulus of the field test .
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