Slab track structures become deformed under the effects of differential subgrade settlement. According to properties China Railway Track System (CRTS) II slab on a subgrade, three-dimensional (3D) coupled model based both discrete element method (DEM) and finite difference (FDM) was developed. The were simulated using FDM DEM, respectively. verified. deformation contact forces gravel grains in ...

Subgrade filling of high-speed railway will cause additional settlement and deformation existing lines.In this paper,using the finite element analysis platform (Taxis 2D) considering line itself, This paper analyzes impact new old subgrade lap type layer filled lesson on implementation subgrade. The results illustrate following points:(1) Compared with different overlapping surface types, those...

The main purpose of our project is to test the improvement in CALIFORNIA BEARIBG RATIO SUBGRADE SOIL upon usage GEOTEXTILE layer soil. We planned effect geotextile under different conditions placement height, soil characterstics and moisture content. performed experiments laboratory determine results variation CBR value plotted it draw inferences. Key Words: CBR, Geotextile, Subgrade, Moisture ...

Based on the method of BP neural network,a foundation settlement of BP neural network prediction model was established for a railway subgrade in HeFei area China. In the model, the previous field monitoring data was used as the training sample and the later settlement was predicted. The model was used for four test sections of the railway subgrade. The results showed that for the four test sect...

Crushed stone bases are widely used for low-volume roads. However, shear strength of the crushed stone materials can be vastly improved by confining the material in geocellular confinement systems or geocells. Geocells are 3-dimensional honeycomb-like structures. The objective of this study was to test a geocell design with crushed stone (AB-3) in-fill and a thin hot-mix asphalt (HMA) surface l...

––The performance of pavements depends to a large extent on the strength and stiffness of the subgrades. Subgrade strength (CBR) plays a major role in pavement design. Since determination of CBR value in field requires need of equipment and also time consuming alternatively one can be predict CBR value of subgrade in field from other soil support tests namely Dynamic Cone Penetrometer Index (DC...

Rubblization is an in-place rehabilitation technique that involves breaking the concrete pavement into pieces. This process results in a structurally sound, rut resistant base layer which prevents reflective cracking (by obliterating the existing concrete pavement distresses and joints) that can then be overlaid with Hot-Mix Asphalt (HMA). The design of the structural overlay thickness for rubb...

The Long Term Pavement Performance (LTPP) program is a 20-year study of inservice pavements across North America. Its goal is to extend the life of highway pavements through various designs of new and rehabilitated pavement structures, using different materials and under different loads, environments, subgrade soil, and maintenance practices. LTPP was established under the Strategic Highway Res...