Research On Wind-break Facilities Of The Second Lanchow-sinkiang Double-line Railway

The second channel from Lanchow to Urumqi, a line for passenger transport, is the first high-speed railway through strong winds region of our country, on which high-speed EMU runs with the speed of 350km/h. Its total length is 1768 km, with 500 km through wind region. Frequent and strong wind, complex road situation pose a serious threat on the running train safety and expedite railway transportation. It is the key element to constrain the success of the second Lanchow-Sinkiang double-line project whether the running train is safe and overhead contact wire above pantograph supplies power normally or not. To insure high-speed EMU security through winds region, research on the coupling air dynamic characteristics among the wind, vehicles, roads, walls, overhead contact wire etc and train safety must be carried out.This paper give priority to the numerical simulation, with the supplements of moving model test and wind tunnel test verification. Based on the numerical calculations about aerodynamic characteristics of EMU and influence on overhead contact wire after the wind-break facilities, the right height of wind-break wall in different subgrades and reasonable shape of wind-break corridor are researched. The conclusions are that:the reasonable height of wind-break wall on the ground and embankment is in the rangement of 3.5m-4m, but lower on the line below the ground, the higher embankment is, the smaller maximum defendable wind is; in the area where environment wind speed beyond wind-break wall's defence, a new kind of semi-enclosed wind-break corridor is put forward to be bulit, and this wind-break corridor can not only provide comprehensive protection to the train and overhead contact wire, prevent the sand, but also make no adverse effects, such as tunnel aerodynamic effects etc, so it is an ideal wind-break facility within strong winds region for high-speed railway.Research achievements provide scientific reliable basis for the wind-break facilities design of the second Lanchow-Sinkiang double-line railway, which has been applied in the line construction.