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| Design of Route Selection and Windproof Measures for Strong Wind-hit Section of Second Double Line of Lanzhou-Urumqi Railway |
| WANG Zheng-ming |
China Railway First Survey & Design Institute Group Co. Ltd, Xi’an, Shanxi 710043,China
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Abstract Abstract：Research purposes：As the importance and difficulty of railway project, design of route selection and enginering measures is closely related to the economical efficiency and reliability of project. During the second double line of Lanzhou-Urumqi railway design, through analysis of the major elements, the principles are considered in the design of route selection along 100-kilometer wind area. Aiming to prevent the hazard of wind, the scientific research has been conducted in the design of subgrade, bridge and anti-wind tunnel, based on the extensive site investigation, we propose the specific windproof design measures for 200 km/h railway.
Research conclusions：(1) The wind hazard of many aspects is existing in Lanzhou-Urumqi railway line, and the second railway line with higher speed and lighter body of rolling stock is estimated to be even worse, thus, study of route selection and design of windproof measure is very important. (2) The impact of wind is prove to be the significant control factor for route selection in 100-kilometer wind area. In addition, the alignment shall be selected as per project function, geological condition, environmental protection, safety and economical efficiency, such principles shall be followed. (3) The alignment that is parallel on the south of existing railway line in 100-kilometer wind area can meet the functional req〖JP2〗uirement. Furthermore, this proposal could mitigate the wind hazard, minimize the environmental impact and save the cost as well through taking feasible windproof measures. (4) The wind-〖JP〗shield wall is mainly adopted as the windproof measures in subgrade section. The major types of wind-shield wall including cantilever, counterfort, column & plate type were adopted respectively in sections of different height of embankment and depth of cut, considering the division of wind area, distribution of wind speed, frequency characteristics. (5) Adoption of wind-shield barrier which is made of steel structure on bridge and u-shaped girder can assure the safety of bridge structure and wind-shield barrier itself. (6) To reinforce the windproof measurse, windproof open-cut tunnel was built partially in core of 100-kilometer wind area. （7）The selection of route selection and design of windproof measures studied in this paper are avaiable for references in the design of similar projects.
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