Abstract: Due to the geological factors in the construction of Yuntunbao Tunnel on ChengduLanzhou Railway, the design scheme of emergency rescue station should be optimized. The economic and technological comparison is made among 3 optimization solutions from the aspects of civil engineering scale, project investment, construction risks, evacuation and ventilation, and operation and maintenance, respectively. Meanwhile, the arrangement of rescue stations in singletube doubletrack tunnel is further explored and studied. The study results show that: (1) The scheme of multiple small crosssection galleries might be superior to that of a large crosssection gallery for emergency rescue station of extralong tunnel. (2) The structural intervals should be expanded properly at emergency rescue station section to avoid interactions between tunnels. (3) High construction risks might also exist when a rescue station requires smallscale civil engineering. (4) The adjustment of civil engineering schemes for a rescue station would affect the matching of electromechanical equipments and operating cost. (5) The shafttype connected smoke vents should be designed with 90° vertical bends for the convenience of construction, operation and maintenance.

Key words: extralong tunnel, disaster prevention and rescue, Yuntunbao Tunnel, singletube doubletrack tunnel, emergency rescue station