The Research Of The Loess Subgrade Modulus Of Resilience In Shanxi Province

As the basis of the pavement structure, the anti deformation capacity of the subgrade play decisive role in the strength, stiffness and stability of pavement structure. The resilient modulusof subgrade is the main mechanical parameters and it reaction the deformation of subgrade. The value of resilient modulus directly determines the size of the design of pavement layer thickness. In currently road design, resilient modulus used for static modulus, and it has some differences in the actual operating condition of road for the road withstand the dynamic loads of vehicle. So, combined with the Shanxi province’s soil type, traffic load characteristics, climatic conditions and the subgrade stress level under the pavement structural condition research on dynamic resilient modulus with the degree of compaction, moisture, stress level and the relationship between the static and dynamic resilient modulus, have a important significant in the design of the construction of roads and the detection of the roads in the actual operation. In view of this, this paper researches the dynamic subgrade resilient modulus of Shanxi Province depthly.The main contents of this paper have the following aspects:(1) Analysis the main factors affecting the subgrade resilient modulus, and made extensive and in-depth investigation for a variety of factors in Shanxi Province.(2) Through the BISAR program calculat and analysys the distribution of typical asphalt pavement structure roadbed in different traffic stresses rating, obtained the range of subgrade stress levels.(3) Through the sample soil’s fundamental physics test of six basins and seven expressways in Shanxi Province, obtained the soil type distribution in Shanxi Province.(4) Select a province-wide representative soil sample, get on dynamic and static resilient modulus test at indoor and on-site, research the relationship between dynamic and static resilient modulus with the water content, degree of compaction and stress.(5) Finally, through the typical mechanical parameters of soil samples related test, analysis the relationship between resilient modulus, CBR, deflection, and other mechanical indicators, proposes typical soil samples representative of the resilient modulus values for different regions.