Investigation On Construction Technology And Security Of Underpassing Metro Station Crossing Railway Ground

The across-station tunnel of Nanjing Metro passed through Nanjing railway station and rail lines Ⅰ-Ⅷ. It intersected these lines with angle of 80°, and the consealed-tunnel's depth is 6.69m-8.06m, which is the first metro station spanning railway by mining method in China.This article discusses the underpassing-tunnel's effect on the existed railway, reinforce project to the lines by using D24 military beams, and investigation on the choice of beam foundation. According to the practical movement of Shanghai-Nanjing railway, the present paper does theoretic feasible research on reinforce project to the consealed-tunnel and dynamical test to the lines and tunnel structures during construction under the worst combined load situation. Also, the security of rail lines and trains during the tunnel's construction is analyzed by the test data.By doing this investigation, this article affords experience parameters for the design and construction on beam foundation reinforce of the existed rail lines, and puts forward a brand new concept to multi-across beam foundation. It will be useful for reference to the similar construction engineering.