Russian Federation
Russian Federation
Russian Federation
UDC 628.2
Objective: due to the observed trend of decreasing climate continentality in the North-West of Russia in the next 30–50 years, the supply to wastewater disposal systems in railway transport will increase by an average of 10–20 %, however, waterlogging is already observed in poorly permeable soils in some periods. Calculations show that the efficiency of drainage of the earth bed can be significantly increased if cavity-free drainage is applied. Caveless drains can be given a different cross-sectional shape, and it is of practical interest to answer the question of how, all other things being equal, this will affect the effectiveness of drainage. Methods: the bearing capacity of the soil of the roadbed is influenced by its humidity regime, while increasing the depth of the groundwater position in the roadbed, counting from the base of the sleepers, will also help to increase the bearing capacity of the roadbed. An example of the hydraulic calculation of caveless drains of different cross-sectional shapes is given. Results: it was found that of the three different cross-sectional shapes (trapezoidal, composite and triangular), the cavity-free drainage having a trapezoidal cross-sectional shape has the greatest drainage efficiency. At the end of the article, geotechnical calculations of sediments and stresses in soft-plastic loam are performed for the same cross-sectional shape. Practical significance: a justification has been obtained for the most effective crosssectional shape of a cavity-free drainage for drainage of an earth bed from poorly permeable soils.
cavity-free drainage, hydraulic calculation, drainage system, reclamation channel
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