合川车站超大跨双联拱明洞位于遂渝铁路合川车站站场填方内，明洞全长71.5m，洞门为斜切式，单孔内轮廓净宽17.32m，双联拱结构最大宽度达45.2m，拱顶填土高约9m，为大跨度高填方公路与铁路立交明洞，主要介绍该明洞主体结构设计。

Located in the fill of Hechuan Station Yard on SuiYu Railway Line, the doublearch opencut extralargespan tunnel for Hechuan Station is a largespan highfilled highwayrailway separate grade opencut tunnel. The tunnel has a total length of 71.5m, truncated portals, 17.32m inner net clearance width of single span, 45.2m maximum width of the doublearch structure and 9m filling depth on the top of the crown. This paper introduces the design of the main structure of this opencut tunnel.