Boussinesq problem application for determining the surface pressure of soil-backfilled bridges

This paper is part of the thesis work «Improvement of calculation methods and structural forms of soil-backfilled bridges and steel-fibre concrete pipes». In the course of conducted earlier studies on the analytical approach to modelling the pressure distribution from temporary loading it was noted that the application of the Boussinesq problem solution to determine the pressure on the load-bearing element of the structure of soil-backfilled bridges and steel-fibre concrete pipes gives unsatisfactory errors by comparing the deflections obtained with the deflections obtained during static load tests of the bridge. The paper proposes to improve the pressure distribution laws and to achieve greater convergence of the calculation results with the results of in-situ static bridge tests by introducing the following calculated position: Taking into account stresses distribution in the soil column from the static test load both along the length and width of the load-bearing element vault. Taking into account the horizontal component of pressure from the static test load. Taking into account joint work with the backfill soil by taking into account the ground mass back pressure by introducing the bedding value. To confirm the validity of the collecting temporary loads method on the bearing element of the soil-backfill bridge proposed by the authors, the values of displacements of the bearing element sections at characteristic points obtained during the research were correlated with the values obtained during field tests of the road bridge in the Vologda region at 156 km of the A-114» Vologda — Novaya Ladoga» road.