Tunnel structure for expansible stratum

Abstract

The invention relates to a tunnel structure for an expansible stratum. The tunnel structure comprises a steel rack sprayed concrete primary support brace, a reinforced concrete arc wall lining, an inverted arch and inverted arch filling, wherein a reinforcing steel bar grating truss is disposed in the inverted arch filling over the inverted arch; and a central seepage trench is arranged under the inverted arch. A tunnel structure is adjusted, and tunnel inverted arch curvature is enlarged; a central water trench is replaced by the reinforcing steel bar grating truss is placed in the inverted arch filling, so bearing performance of a base structure is improved; with the arrangements of the side trench and the central seepage trench, underwater in the stratum around the tunnel and the base can be discharged; and stratum expansion deformation and damages to a tunnel lining structure by the expansion and deformation can be reduced.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering, and in particular relates to a tunnel structure for expansive formations. Background technique [0002] The rail surface of the double-line tunnel structure is approximately circular, the inverted arch structure is relatively flat, and its bearing capacity is worse than that of the arch, and the traditional waterproof and drainage system mainly consists of waterproof board + non-woven fabric, circumferential blind pipe, longitudinal dead pipe, drainage Consists of side ditch and central gutter. The groundwater behind the lining of the arch wall can be introduced into the side ditch of the tunnel through blind pipes, and the side ditch is connected with the central ditch through pre-buried water pipes at a certain distance, so that the water from the side ditch can be introduced into the central ditch, and finally drained from the side ditch The groundwater behind the lining arch wall...

AI Technical Summary

Problems solved by technology

The groundwater behind the lining of the arch wall can be introduced into the side ditch of the tunnel through blind pipes, and the side ditch is connected with the central ditch through pre-buried water pipes at certain distances, so that the side ditch water can be easily introduced into the central ditch, and finally drained from the side ditch The groundwater behind the lining arch wall is drained out of the tunnel through the center ditch, but the groundwater under the tunnel base often cannot be discharged smoothly

For tunnels located in expansive strata, if the tunnel base is flooded all the year round, the expansive strata will swell and deform after being soaked in water for a long time and generate a huge expansion force, which will directly act on the tunnel base, resulting in excessive deformation of the tunnel base. In severe cases There will be diseases such as uplift and cracking of the filling surface of the inverted arch structure, and the uneven expansion of the expansive stratum will also cause uneven settlement of the tunnel, which seriously affects the safety of train operation, and the later maintenance is difficult and expensive

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