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

Abstract

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.

Description

technical field [0001] The invention relates to a retaining reinforcement structure and a construction method of a tunnel entrance section. Background technique [0002] With the large-scale construction of traffic lines in our country, especially expressway and railway projects, we are faced with the construction of a large number of tunnel projects in mountainous areas. There are a large number of tunnel entrances in the center of the valley in mountainous areas. Since the center of the ditch is generally loose accumulation of rock and soil, the important issues for safe entry of tunnels under this terrain are: the impact of tunnel excavation on the stability of the slopes on both sides of the ditch center and the collapse of the overlying soil layer. [0003] At present, the tunnel entrance method with poor stability of the slopes on both sides of the ditch center adopts a separate reinforcement method: first, the slopes on both sides are reinforced by conventional metho...

AI Technical Summary

Problems solved by technology

However, when the stability of the slopes on both sides of the ditch center is poor or poor and the excavation disturbance may induce large-scale landslides, this method requires too high pre-reinforcement costs or even fails to achieve the effect of safe tunneling.

Moreover, when the surrounding rock level of the tunnel is poor, the excavation of the tunnel will cause the disturbance of the overlying soil layer and the slope, and when the slope slope and the thickness of the covering soil on both sides are different, it will also cause a large bias impact on the tunnel.

Moreover, due to the pre-reinforcement of the slopes on both sides of the ditch center, a relatively large-scale excavation is generally required, which seriously damages the geological body and ecology. Moreover, the reinforcement cost of the slopes on both sides is relatively high, and the construction period is relatively short. long

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