Abstract:

Researching on soil-stone embankment of some expressway, the mechanical parameter of filling and corresponding constitutive relationship is obtained by triaxial test. Analyzing the different degrees of road-dike and digging steps with different sections in road-dike, the deformation stress feature is disclosured and the influential factors are analyzed. The research results indicate that the sedimentation is the major deformation, and it causes horizontal heave in middle-under parts and tendency toward sliding between filling and ramp is obtained. Internal stresses are increased towards to the deep part; and it comes to the top nearby the interface. The stress deformations have direct ratios with height of filling and inverse ratios with degree of slope. Along with the increase of degree of slope, deviation of the displacement phasor was aggravated; the tendency toward sliding was strengthened. And setting digging steps can eliminate the relative sliding tendency effectively, so as to improve the stability of roadbed.

Key words: road-dike, stress and deformation field, influential factor, numerical simulation, ramp