Abstract:At present,rock collapse is common existing in the construction of double-arch tunnel,and large area cracks are found in linings. Jindong tunnel is located in Yuhuan railway between Ganjiaba and Yuquan,and double lines tunnel is reserved for the second line,which lies to the right of the first line. The distance between the two lines is 14.09 m,which is wide enough to build the second one. The distance between the two lines in the tunnel exit is 5.03 m with tunnel segment of 150 m shaped coattail;and the length of the double-arch tunnel is 42.2 m. Various construction methods are available for double-arch tunnel construction. When the condition of wall rock is favorable,three-cavity or two-cavity is adopted to excavate tunnel. For the sake of the construction safety,FEM is considered to analyze the mechanics of two different construction methods,and the displacement,force of preliminary support,and safety factor are obtained. Finally,results that can provide some references to construction of double-arch tunnel are achieved.