Railway tunnel bottom structure

The utility model belongs to the field of underground engineering supporting structures, and particularly relates to a railway tunnel bottom structure. The tunnel structure comprises a tunnel and further comprises a pre-deformation inverted arch with the rise-span ratio of 1/12-1/5, and buffer layers are arranged at the bottom of the pre-deformation inverted arch and the bottom of the tunnel. When the bottom of the high-speed railway tunnel bulges, the pre-deformation inverted arch can reduce a track lifting value caused by the bulge of the bottom of the tunnel, so that the smoothness of a track structure is ensured; besides, buffer layers are further arranged at the bottom of the pre-deformation inverted arch and the bottom of the tunnel, so that enough buffer space can be reserved in the construction process, and cracking of the pre-deformation inverted arch caused by long-time action of horizontal structural stress can be prevented. Therefore, the upheaval phenomenon at the bottom of the high-speed railway