УДОСКОНАЛЕННЯ МЕТОДУ РОЗРАХУНКУ ПАРАМЕТРІВ ПОПЕРЕЧНОГО ДРЕНАЖУ МІЛКОГО ЗАКЛАДАННЯ НА АВТОМОБІЛЬНИХ ДОРОГАХ

Abstract

An important aspect of the road structure strength and stability ensuring is the issue of subgrade favorable water-thermal regime providing during the service life. The article analyzes the results of research by scientists from different countries on the issues of taking into account the humidification regime and the arrangement of the drainage system on highways. One of the main design parameters of shallow transverse drainages is the distance between the drainage slots. The exact definition of this indicator determines the efficiency of water drainage from planar drainage and makes it possible to optimize the cost of drainage structures installation. In the presented work the questions of the existing normative base on climatological indicators definition and principles of shallow drainages calculation are generalized and tasks of researches on improvement and specification of distance between cross drainage apertures calculation method in such drainages are formulated. The authors propose a new solution to the problems. The developed method is based on the basic of non-uniform smooth-motion of a fluid in prismatic channels differential equation and the hypothesis of VI Chernomsky. The authors developed dependences to determine the distance between the transverse drainage slots in shallow drainages. The developed mathematical equations for the main parameters of transverse shallow drainage on characteristic sections of the highway adequately take into account the main factors influencing the process of moisture migration in the drainage layers and allow to solve problems of water-heat regulation of roads in a new aspect. The results of calculations of the distance between the transverse drainage slots, according to the proposed method, for the conditions of the first roadclimatic zone of Ukraine, the maximum total specific excess of water entering the drainage structure for the sand drainage layer with the value of filtration coefficient 4, 5 and 6 m / day are presented. The obtained data are compared with the calculation results according to the traditional method. Appropriate conclusions are made. KEYWORDS: DRAINAGE SYSTEM, DRAINAGE LAYER, DRAINAGE SLOTS, SHALLOW TRANSVERSE DRAINAGE, ROAD, WATERWAY, SUBGRADE.