About: Subgrade is a research topic. Over the lifetime, 8184 publications have been published within this topic receiving 60577 citations. The topic is also known as: formation level.
Papers published on a yearly basis
01 Jan 1995
TL;DR: In this article, the authors provide practical guidance for the design, construction, maintenance, and renewal of railway track as they relate to geotechnology, along with the properties of the ballast and subgrade materials.
Abstract: This study provides practical guidance for the design, construction, maintenance, and renewal of railway track as they relate to geotechnology. Key functions of various track components are examined, along with the properties of the ballast and subgrade materials. In addition, the equipment and methods used for track installation, maintenance and renewal are explained in detail, as are the factors which determine the long-term geometric quality of the track.
TL;DR: The theories of vertical and horizontal subgrade reaction are based on the simplifying assumptions that the subgrade obeys Hooke's law as mentioned in this paper, and that the reaction on the base of a rigi...
Abstract: Synopsis The theories of vertical and horizontal subgrade reaction are based on the simplifying assumptions that the subgrade obeys Hooke's law, and that the subgrade reaction on the base of a rigi...
TL;DR: A status report of ground-penalizing radar (GPR) highway applications is provided in this paper based on studies conducted in both Scandinavia and the USA, where ground-coupled and air-launched GPR systems together with a discussion of both signal processing and data interpretation techniques are discussed.
•16 Mar 2011
TL;DR: The bearing capacity of track, train speed, riding quality and passenger comfort all depend on the stability of ballast through mechanical interlocking of particles as mentioned in this paper, and ballast attrition and breakage occur progressively under heavy cyc
Abstract: Ballast plays a vital role in transmitting and distributing train wheel loads to the underlying sub-ballast and subgrade. Bearing capacity of track, train speed, riding quality and passenger comfort all depend on the stability of ballast through mechanical interlocking of particles. Ballast attrition and breakage occur progressively under heavy cyc
TL;DR: In this paper, a study of the resilience of a SANDY CLAY structure was conducted, where the authors defined a set of techniques that contribute to the robustness of the structure to load.
Abstract: THE PURPOSE IS TO DEFINE BETTER THOSE PROPERTIES OF GRANULAR BASE MATERIALS THAT CONTRIBUTE TO THE RESILIENT RESPONSE OF PAVEMENT STRUCTURES. A STUDY IS INCLUDED OF THE INFLUENCE OF AGGREGATE DENSITY, AGGREGATE GRADATION (PERCENT PASSING NO. 200 SIEVE), AND DEGREE OF SATURATION ON THE RESILIENT RESPONSE OF TWO AGGREGATES REPRESENTATIVE OF THOSE USED IN THE CONSTRUCTION OF ASPHALT CONCRETE PAVEMENTS. TESTS CARRIED OUT IN TRIAXIAL COMPRESSION, CONSISTED OF APPLYING REPEATED AXIAL STRESSES WITH REALISTIC STRESS HISTORIES AT A FIXED FREQUENCY AND AT A LOAD DURATION REPRESENTATIVE OF THAT EXPECTED IN THE FIELD. FOR BOTH GRANULAR MATERIALS, THE RESILIENT MODULUS INCREASED CONSIDERABLY WITH AN INCREASE IN CONFINING PRESSURE AND ONLY SLIGHTLY WITH AN INCREASE IN AXIAL STRESS. POISSON'S RATIO INCREASED WITH A DECREASE IN CONFINING PRESSURE AND AN INCREASE IN REPEATED STRESS. THE RESILIENT MODULUS AND POISSON'S RATIO WERE ALSO AFFECTED TO LESSER DEGREES BY DENSITY, PERCENT PASSING THE NO. 200 SIEVE, AND DEGREE OF SATURATION. AN ANALYSIS OF A CONVENTIONAL ASPHALT CONCRETE PAVEMENT OVER A SANDY CLAY SUBGRADE INDICATED THAT REASONABLE CHANGES IN THE MODULUS OR POISSON'S RATIO OF THE GRANULAR BASE LAYER CAN RESULT IN CONSIDERABLE CHANGES IN THE RESPONSE OF THE PAVEMENT STRUCTURE TO LOAD. /AUTHOR/
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