Abstract：Abstract：Research purposes： At present, all problems of urban rail transit that the highest running speed of the train is more than 100 km/h are not specified or required in the urban rail transit specification in China and there is also not the similar successful experience at abroad. On the background of Line R2, Dongguan urban rapid rail transit, the study has been made on urban rail transit that the highest running speed of the train is more than 100 km/h, and comfort standard during the running of train, aerodynamic effect and design of auxiliary structure. The study result can provide a direct guide for engineering design and a reference for similar engineering.
Research conclusions：(1) If the train speed is more than 100 km/h, the inner clearance of underground sectional tunnel section meets not only gauge requirements, but also aerodynamic effect. According to current actual conditions, the effective section area of the tunnel should be enlarged to meet the comfort requirement. (2) The flat shield tunnel lining structure with C50 single-layer reinforced concrete that the inner diameter is 6.0 m and outer diameter is 6.7 m can meet the structural mechanics of sectional tunnel and comfort requirement of urban rail transit with the highest running speed of 120 km/h. (3) The above research achievement has been applied successfully to urban rail transit.
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