Anti-slide pile and frame arch combined structure and construction method

The invention discloses an anti-slide pile and frame arch combined structure and a construction method. The combined structure comprises anti-slide piles (1) arranged on two sides of a tunnel body in an embedded mode, and the anti-slide piles (1) extend to a stable base rock (8); a frame arch (6) is connected with the anti-slide piles (1) on the two sides; a guard arch (2) connected with I steels (11) of the pile bodies of the anti-slide piles (1) on the two sides is arranged above a tunnel arch ring (3); and the guard arch (2) is provided with a backfilled soil rock layer (5) in back of the piles. The combined structure is suitable for a pre-supporting reinforcement structure of a tunnel portal under a ditch heart terrain when thin soil is covered on the tunnel and the stability of slopes of two sides is poor or relatively poor; by a mode of combining the anti-slide piles, the frame arch and the guard arch into a whole, the stress performance of the anti-slide piles is greatly improved; and the slopes of the two sides of the ditch heart tunnel portal and the covered soil layer are integrally reinforced, so that digging and reinforcement of the slopes of the two sides of the ditch heart are reduced, stability and ecology of the original slopes are ensured, the reinforcing cost of the slopes of the two sides is saved, and the construction is simple.