Shallow-buried sand layer shield portal end soil body reinforcing structure

The utility model provides a shallow-buried sand layer shield tunnel portal end soil body reinforcing structure which comprises a plurality of in-tunnel grouting pipes inserted into in-tunnel soil bodies in a tunnel portal ring and arranged in the length direction of a tunnel, and a plurality of in-tunnel grouting pipes inserted into the in-tunnel soil bodies in the tunnel portal ring. The plurality of advanced large pipe sheds are inserted into the upper soil body above the arch part of the tunnel portal, and the plurality of advanced large pipe sheds are annularly arranged along the outer edge direction of the arch part; the advanced small conduits are inserted into the upper soil body, and the advanced small conduits and the advanced large pipe sheds are alternately arranged. Accordingto the utility model, the problem that the soil body at the end of the shield portal at the vertical shaft of the shield section, which does not have the conventional ground vertical jet grouting pilereinforcing construction