Monitoring of the roadbed main site bearing capacity in the area of culverts

   As part of the implementation of the national state project Safe and Quality Roads, maintenance of federal, regional, inter-municipal and local roads that includes road monitoring, is an urgent issue. An urgent task of monitoring is to increase the periods between repairs and to reduce the cost of road inspections. The article pays attention to the road sections directly located in the culvert location area and has considered the main road bearing capacity monitoring subgrade site in the culvert location area.
   The notion of the main roadbed area was introduced that is identical to the accepted top layer of the embankment. The bearing capacity estimation index of the road bed in the area of culverts location is introduced. The estimation index is calculated on the base of density values, coefficient of adhesion and internal friction, received as an investigation result of road bed grounds according to engineering and geological elements. Theoretical values of road bed bearing capacity in the area of culverts location according to the criterion of minimum error of parameters of regression equations, from which the ground density, specific resistance and the angle of internal friction according to the maximum value of determination coefficient have been obtained. Ground investigations established the boundaries of humidity change at the barrier culvert locations, at some distance from the culverts, porosity coefficient, and density and highlighted the engineering geological elements. Verification of experimental and theoretical values convergence was carried out for exponential, logarithmic, power and straightline dependences. The absolute error is calculated. The smallest one is for the linear and logarithmic dependences. It has been grounded that the bearing capacity of a road bed in the culvert location areas can be determined according to the calculated values of the specific coupling, the angle of internal friction statically connected with the experimentally determined deformation modulus or according to the experimentally determined specific coupling and the calculated values of the internal friction angle and the deformation modulus.
   The proposed method of the earth bed bearing capacity evaluation considerably reduces the costs of experimental investigations of soils and allows predicting the terms of major repairs.

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