Researeh On Alignmeut Design Of Yela Mountain Section In State Road 318 Highway

The construction of roads in mountain areas has an important role in China ,in this paper, by mountain-specific physical geography, topography, eco-environmental characteristics, mountain road alignment design experience as well as methods of research on China's western mountain Road Alignment design and attention to a systematic discussion of the matter on the research result of road traffic system by researchers domestic and aboard. In this paper, because the specific circumstances of the western mountain areas, according to local conditions put forward the design of highway alignment in the region should focus on seven basic points to consider principles, namely:the principle of selection lines, the surrounding environmental principles, graphic design principles, vertical section design principles, cross-sectional design principles , climbing lanes and avoid danger design principles, the old road reconstruction principles, which guide in the western region for Highway Alignment Design is worth learning; take Tibet Qamdo State Road 318 for example, a survey of the old road of after concluding the status quo proposed alteration of the original difficulties of the old line-shaped lots, including the horizontal alignment, vertical gradient, as well as cross-sectional width, etc., and by the investigation section of a partial reconstruction program than the election, concluded that a reasonable reconstruction of the section program ; in highway design and traffic safety linear relationship, focused on analysis of plane, vertical section, flat vertical linear combination, cross-sectional, sight distance and other major elements of the impact on traffic safety, combined with our norms that guarantee the corresponding linear design safety proposal. Sum up mountain roads in the Signs and Markings set principles, and a small radius curve, grew up slope sections of the tunnel mouth and other sections illustrate how this set of three road signs marking the attention point.In addition, papers that, for mountain roads, and its own characteristics, the proposed indicators should be flexible around the linear application of the best designated the corresponding design specifications.