Crumb rubber (CR) has been proposed to apply in the ballast or sub-ballast layer for degradation mitigation and vibration (noise) reduction. The CR can change stiffness, which affect train-track-subgrade dynamic performance cause travel comfort safety issues. Towards this, this study aims at confirming 1) how much application of train layer; 2) what extent CR-ballast distribute loadings reduce ...

This paper presents a study on the influence of construction an ultralarge-diameter shield tunnel undercrossing existing high-speed railway using empirical method, numerical analysis and geotechnical centrifuge model experiment based Wuhan Lianghu Highway Tunnel project. The comparison results obtained from three methods shows first, that simulation match well with method for worst-case scenari...

It is a unusual practice in national new pavement designs and rehabilitations to consider the nonlinear elastic behavior of materials that constitute or will layers. However, linear response simplification actual layers behavior, since used structure have stiffness dependent on stress state (granular subgrade) temperature time load application (asphalt concrete). In view this, this paper aims s...

1 2 Resilient modulus test is the recommended test to characterize subgrade soil for 3 pavement design in 1993 AASHTO pavement design guide as well as new proposed 4 Mechanistic-Empirical Pavement Design Guide (MEPDG). This test requires significant 5 resources including high level of technical capability to conduct. For smaller projects where 6 costly and complex resilient modulus testing is n...

The utilization of red mud waste discharged from the Bayer production process used for extracting alumina bauxite presents a pressing demand in aluminum industry. This study aims to adopt chemical modifier solidify its application highway subgrade. mechanism and properties modified using composed cement, phosphogypsum organic polymer, were analyzed investigated. It was found that optimal dosage...

A pavement structure consists of several layers for the primary purpose of transmitting and distributing traffic loads to the subgrade. Rutting is one form of pavement distresses that may influence the performance of road pavements. Geosynthetics is one type of synthetic materials utilized for improving the performance of pavements against rutting. Various studies have been conducted on using d...

The permanent deformation pavement of roads and streets at tropical zones Abstract (if layers are sufficiently compacted) is due to increase of asphalt layers temperature and consequential decrease of modulus of elasticity. Therefore, the asphalt mixture moves aside of the wheels of heavy vehicles and cause permanent deformations without volume variation. On the other hand, if the asphalt layer...

There are two principal reasons for compacting highway subgrades and fills. One of these is to improve subgrade strength, thereby permit­ ting an economical pavement design to support the required wheel loads. The other purpose is to create a fill of low compressibility, thereby minimizing settlements of the roadway. Although high strength and low compressibility are always in the pavement desi...

The design and construction of the trackbed support structure is extremely important for controlling track settlement, dynamic deflection, and the overall quality of the trackbed. These factors largely influence the long-term performance of the track relative to maintaining adequate geometric features for efficient and safe train operations. Performance-based design methods provide design crite...