BASIC PRINCIPLES OF FLEXIBLE PAVEMENT DESIGN AND CONSTRUCTION IN THE USSR

CLIMATIC FACTORS IN THE USSR ARE DISCUSSED IN REGARD TO ECONOMIC DEVELOPMENT OF FLEXIBLE PAVEMENTS. THE METHOD USED FOR DETERMINING THE THICKNESS OF FLEXIBLE ROAD PAVEMENTS IS DESCRIBED. THE METHOD IS BASED ON THE FOLLOWING THESIS: (1) THE STRESS CONDITIONS IN THE ROAD STRUCTURE AT THE BEGINNING OF FAILURE ARE CHARACTERIZED BY A DEFINITE ULTIMATE VALUE OF ACCUMULATED VERTICAL DISPLACEMENT, AND DEFLECTION OF THE PAVEMENT, (2) THE MODULUS OF DEFORMATION OF THE STRUCTURE DEPENDING UPON THE RATIO BETWEEN THE UNIT LOAD ACTING ON THE SURFACE OF THE STRUCTURE AND THE TOTAL RELATIVE DEFLECTION CAUSED BY IT, IS THE CRITERION FOR DETERMINING THE RESISTANCE TO DEFORMATION OF FLEXIBLE PAVEMENTS, AND (3) THE ROAD PAVEMENT SHOULD BE DESIGNED IN SUCH A MANNER THAT THE ACTUAL DEFLECTION OF THE DESIGN STRUCTURE UNDER THE ACTION OF DESIGN MODE DOES NOT EXCEED THE ALLOWABLE DEFLECTION TAKING INTO ACCOUNT THE NATURE AND INTENSITY OF THE ROAD TRAFFIC. THE DESIGN METHOD FOR FLEXIBLE PAVEMENTS IN THE USSR PERMITS: (1) THE DESIGN OF NEW ROAD DEVELOPMENT WHICH REQUIRED OPERATING PROPERTIES FOR VARIOUS CLIMATIC CONDITIONS WITH AVAILABLE DATA ON TRAFFIC NATURE AND DENSITY AND ON THE QUALITY OF MATERIAL TO BE USED, (2)VARYING DESIGNS OF PAVEMENT OF EQUAL STRENGTH USING VARIOUS MATERIAL IN SEPARATE LAYERS AND CREATING THE MOST EXPEDIENT AND ECONOMICAL STRUCTURES, AND (3) ESTIMATES OF THE STRENGTH OF EXISTING PAVEMENTS ON EXISTING ROADS AND THE REQUIREMENTS FOR THEIR IMPROVEMENT OR RESTRICTION OF TRAFFIC AS REGARDS NATURE AND INTENSITY IN THE RAINY PERIOD OF THE YEAR. METHODS FOR OBTAINING THE NUMERICAL VALUES OF DEFORMABILITY INDICES FOR PAVEMENTS AND SUBGRADES ARE PRESENTED. THE MODULUS OF DEFORMATION OF THE SUBGRADE IS RELATED TO THE DESIGNED SOIL CONDITION. THE STRUCTURAL METHODS USED TO LIMIT THE SURFACE AND GROUND WATER ARE PRESENTED. THE PRINCIPAL SOILS STABILIZED IN THE USSR ARE CLAYEY AND SILTY SOILS. CHEMICALLY STABILIZED SOILS ARE CONSIDERED AS HIGH QUALITY MATERIALS FOR ROAD FOUNDATIONS IN PLACES OF POOR RESOURCES. STABILIZATION METHODS ARE DESCRIBED.

Media Info

  • Monograph Title: SOIL AND FOUNDATION ENGINEERING IN THE UNION OF SOVIET SOCIALIST REPUBLICS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00205760
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 2 1994 12:00AM