STRESS-STRAIN STATE OF THE TOP OF THE ROADBED REINFORCED WITH NON-WOVEN MATERIALS, TAKING INTO ACCOUNT THE SEASONAL VARIABILITY OF THE MECHANICAL PROPERTIES OF THE SOIL

Abstract

Despite the significant costs of JSC " NC " ҚТЖ " to stabilize the deforming roadbed, its share in the total length of roads exceeds 10% and this indicates the systemic reason for the current situation, when almost everywhere the same transverse profiles of the roadbed are used regardless of the operating conditions or the climatic conditions of the region where the railway is built, therefore, the hypothesis of the study of ensuring the stability of the main platform of the railway roadbed is very relevant.

The purpose of this work is to justify by calculations and experiments the stress-strain state of the soil of the roadbed measures to strengthen the top of the railway roadbed with non-woven materials to ensure its stability for various regions of Kazakhstan. 

The research methods are based on the principles of the theory of elasticity, soil mechanics, the theory of heat and mass transfer, and mathematical statistics in the processing of experimental and measurement data. For calculations of the stress-strain state of the top of the roadbed, it is recommended to use the PLAXIS 3D calculation system or the COSMOS/M calculation system for elastic deformation of the ground.

The practical and theoretical significance of the work lies in the proposed schemes for strengthening the working area of the railway roadbed with non-woven materials, developed for three climatic zones of Kazakhstan –Southern, Middle and Northern (according to the classification of A.D.Omarov) Taking into account the intensity of thawing and consolidation of soils in the spring period and in the development of recommendations for strengthening the main area of the roadbed in these zones by using sub-ballast layers of draining soils, the conditions for the stability of the main area of the roadbed during seasonal thawing of soils are scientifically established and the influence of non-woven materials and geogrids on the stress-strain state of the top of the roadbed is estimated.