Abstract: In order to evaluate the influence of aerodynamic effect on internal and external environment of station when train passes through the semiunderground station with speed of 350 km/h, and provide a reference for the design of station and connection tunnel, the variation rules of air pressure, wind speed in the platform area and micro pressure wave outside the station are studied by the computational model of aerodynamic effects built by overset mesh technology under the working conditions of upgoing, downgoing, allunderground section and semiunderground section. The results show that: (1) The pressure fluctuation degree of underground area is more severe than that of semiunderground area. (2) Under the condition of upgoing, the pressure fluctuation of underground platform area is the most severe and the peak value of pressure fluctuation and transient pressure reaches maximum, but both are less than the evaluation standard. (3) Under the condition of allunderground section, wind speed of platform area reaches maximum, but the maximum wind speed does not exceed 5.0 m/s. (4) When the up train passes through, micro pressure wave will be generated near junction of underground section and semiunderground section, and the buildings within 50 m should consider the influence of micro pressure. 

Key words: highspeed railway, semiunderground station, aerodynamic, transient pressure, train wind, micro pressure wave