Aspects of Cross Bending Calculation for Winter Road Bases on Boggy Grounds

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UDС

625.731.001.24.128

DOI:

10.17238/issn0536-1036.2018.6.128

Abstract

There is a significant part of natural resources such as forest, oil, gas, etc. in the vast northern territories of European Russia and Western Siberia. Invasion of these territories is difficult due to the poor development of the traffic network and a high degree of swampiness reaching 55–70 %. Therefore, special attention in the development of these regions is paid to winter roads. Observance of certain rules and construction technology allows realization of winter roads advantages. Putting them into operation in autumn is constrained by the presence of unfrozen road sections on water-logged boggy grounds and swamps. The right choice of road topping and technical and economic validity allow increasing lifetime of the winter roads on swamps according to the planned volumes of wood removal and improving them. It is possible to determine the smallest thickness of road pavement (layer of frozen peat) for the passage of vehicles and increase the duration of road life with the help of these measures and the use of special methods of structural analysis. It is shown that the stressstrain behavior of the winter road topping significantly differs from the soil body road topping. Dependence of mechanical properties of the frozen peat area on the temperature and change of its dimensions in the road base leads to the generation of various indicators of mechanical properties in discrete points of the area. A frozen peat layer on a thawed peat layer bends in block and in this sense it is similar to a thin flat plate. It was determined that epures of deflection and tension in the cross section of the road under the symmetrical load are also symmetrical, however, there is a roadway bowing under the asymmetrical load. Cross bending coefficient α is added into the calculations in order to take into account cross bending. Method of coefficient determination and an example of calculation are given.

Authors

V.S. Morozov, Doctor of Engineering Sciences, Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 22, Arkhangelsk, 163002, Russian Federation; e-mail: v.morozov@narfu.ru

Keywords

tension, deformations, swamp, peat, structural analysis, cross bending

For citation

Morozov V.S. Aspects of Cross Bending Calculation for Winter Road Bases on Boggy Grounds. Lesnoy Zhurnal [Forestry Journal], 2018, no. 6, pp. 128–137. DOI: 10.17238/issn0536-1036.2018.6.128

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Received on June 21, 2018