Numerical Simulation of Safety of Wind-Resistant Open Cut Tunnel of Second Lanzhou-Xinjiang Railway
|School||Southwest Jiaotong University|
|Course||Bridge and Tunnel Engineering|
|Keywords||Wind-resistant open cut tunnel wind load opening section safety numerical simulation|
Most of domestic existing railways through the sandy area adopt the open-wire solutions. The engineering measures of roadbed wind wall, sand fence, planting of desert plants, sand control dam, etc are taken and certain results were achieved. However, the results are usually limited for normal speed railways, and the phenomenon of inner wall accumulated with sand is very serious, and the conservation work is huge. The scheme of open cut tunnel can maximize the isolation of wind environment from the train operating environment. The windproof effect is good, but there are problems of high costs, poor operating environment, inconvenient construction work and large amount of repair and maintenance work. At present, some researches on domestic anti-wind structures are generally based on the embankment of normal speed railway and bridge wind wall, and there are no precedents to adopt the wind-resistant open cut tunnel for the high-speed railway for wind resistance, and there are no researches in this area at home and abroad.In this paper, based on the wind resistant project of second Lanzhou-Xinjiang Rail Line, the numerical simulation and computation is used as the main research method to study the following aspects.(1) With FLUENT software, the numerical simulation and computation are carried out on the numerical situations of wind load inside and outside of open cut tunnel and external and internal flow field under the maximum wind speed of 70m/s.(2) With ANSYS software, the wind load value obtained from the numerical simulation and computation of FLUENT software is applied on models of open cut tunnel with different section forms, so as to simulate and calculate the safety and related situations of open cut tunnel structure in the most adverse wind load;(3) With numerical simulation software, the limit wind speed of the train is simulated and computed, and the comparison is made between the maximum wind speed inside the open cut tunnel in different opening forms obtained in the case of maximum wind speed of 70m/s so as to judge the safety of train operation in the tunnel.