Model calibration of line construction - subsoil assisted by experimental research

The load caused by the traf c movement in road constructions should be transferred in a harmless way to the pavement as follows: — on the stiff upper layers of the structure (e.g. layers of asphalt: abrading and binding), and — through the layers of principal and secondary substructure, — on the subsoil, directly or through an improved subsoil layer. A reliable description of the interaction proceeding in a system “road construction–subsoil” should be in such case one of the basic requirements of the assessment of the size of internal forces of structure and its durability. It should be noted that the subsoil of pavement should be recognized as virgin soil or made soil to a depth of frost penetration (not less than the depth at which the vertical stresses from the largest loads are 0.02 MPa [12]). According to [17] the subsoil is examined to a depth of not less than 1.00 m from the designed grade line of the road. According to [4], while the greatest thickness of the subsoil involved in the work of construction of the pavement is approximately 0.70 m There is no de nition which allows for synonymous determination of the thickness of the road structure cooperating with structure subsoil, which is a major problem in creating numerical computational models. Considering the work of the system “road construction–subsoil”, it is commonly accepted [14] that, as a result of repetitive loads on the subsoil under pavement, the growth of relatively small deformations in the initial phase is recognized, then this increase disappears,