Tunnel structure applicable to soft stratum

The utility model relates to tunnel structures and provides a tunnel structure applicable to soft stratum. The tunnel structure comprises combined type tunnel linings, wherein the radial lining comprises primary supports and secondary linings, and the circular lining comprises arch portions, bottom boards and both side walls, which enclose a closed structure. The connection portions between the both side walls and the bottom boards are provided with side root piles, the root piles on both sides are longitudinally arranged at intervals along the tunnel, and the top ends of the root piles are fixedly connected to the linings and inclined towards the outside of the linings to be inserted into surrounding rock. By closing the surrounding rock through the closed linings, overlarge relaxing deformation of the surrounding rock can be avoided and accordingly the integral bearing capacity of the tunnel structure can be improved; the root piles on both sides are distributed in a splay shape to support the closed linings and meanwhile are longitudinally arranged at intervals along the tunnel, thereby effectively controlling settlement during the service period of the tunnel and being fit for in-tunnel construction conditions and safe and convenient to construct. The tunnel structure is applicable to traversing various types of soft stratum.