4. Railway Facilities
Data Collection Survey on the North-South High Speed Rail Project in the Socialist Republic of Vietnam Final Report 4. Railway Facilities 4.1 Civil Structures (Railway, Stations) 4.1.1 Railway This includes basic conditions related to the civil structures such as topographical, geological and soil, seismic, intersections such as existing railway lines, roads, rivers, construction, as well as surrounding environmental conditions. In addition, economic efficiency, workability, construction time, operation and maintenance after the commencement of operations shall be considered. In particular, economic efficiency will be well considered when selecting the civil structures for the HSR system in Vietnam. The HSR civil structures include earthworks such as embankments and cuts, viaducts, bridges, box culverts, tunnels and station structures. In order to minimize construction costs, for the most part, earth structures are selected in open sections. Viaducts are applied to the areas where earth structure does not much the surrounding environment with high population density, many buildings, roads, and railways. Viaducts are also applied to the areas where the residual settlement of the embankment is expected to be largely due to the weak ground. The points to note for each structure type are shown below. (1) Earthwork (Embankments and Cuts) Various aspects, such as collapsing caused by settlement and rainfall, mud-pumping and maintenance, etc., have to be considered when designing and constructing earth structures. In recent years in Japan, new materials and new construction methods such as layer thickness adjustment materials, reinforcement materials, drainage blankets, slope protection work, and roadbed reinforcement are developed. In addition, the performance-based design methods have made it possible to construct earthworks with the same durability, safety, usability, and recoverability characteristics as concrete structures.
[Show full text]