Modeling and simulation on bearing strength evaluation of unpaved road

To develop new instrument for bearing strength test, numerical simulation was carried out to study the reactive mechanism of unpaved road against the equipment load. Double-layer axisymmetrical model was built and load steps were properly disposed based on reality. Then strength reduction method was introduced in finite element analysis on the relationship between bearing strength and material parameter of the gravel cover and subgrade. Simulation indicates that elastic modulus is the decisive factor of distortion characteristic, while the shearing intensity was determined by cohesion, friction angle and flow angle. The research conclusion offers the guidance to establish the test scheme and to determine the threshold parameters.