Construction protection structure and construction method of bias pressure shallow buried tunnel entrance

Abstract

The invention discloses an unsymmetrical loading shallow-buried tunnel port construction protection structure and a construction method thereof, and belongs to the field of tunnel construction. The invention aims at achieving zero excavation before a port is temporarily supported to avoid the disturbance of slope leveling to a massif. The unsymmetrical loading shallow-buried tunnel port construction protection structure comprises protecting arches, a gravity-type retaining wall and a pipe shed, wherein the protecting arches, the gravity-type retaining wall and the pipe shed are arranged at theouter side of the massif, and the gravity-type retaining wall is connected with the outer sides of shallow-buried side arch springing parts and fits the shallow-buried side arch springing parts. Theconstruction method of the unsymmetrical pressure shallow-buried tunnel port construction protection structure comprises the steps of conducting side slope preprocessing, construction of an arch top section, construction of the pipe shed, construction of the shallow-buried side arch springing parts, construction of the gravity-type retaining wall, construction of deep-buried side arch springing parts and backfilling. Before the arch top section is constructed and when the arch top section is installed, the massif does not need to excavated; when the shallow-buried side arch springing parts andthe deep-buried side arch springing parts are installed, excavating is conducted only at the arch springing parts, and the disturbance to the massif during port protection is reduced. Through the arrangement of the gravity-type retaining wall for resisting unsymmetrical loading of the massif, the excavation amount is small, the disturbance to the massif is small, the construction is convenient, the construction sequence can timely obtain the effect of resisting unsymmetrical loading of the massif, and the obtaining period of the effect of resisting unsymmetrical loading is short.

Description

technical field [0001] The invention belongs to the field of tunnel construction, in particular to a construction protection structure and a construction method for a bias-voltage shallow buried tunnel entrance. Background technique [0002] In recent years, with the large-scale construction of highways and railways, there has been a large increase in the number of tunnels near mountains, shallow buried, and biased. Due to the shallow buried depth at the entrance of the biased tunnel, the excavation of the tunnel entrance section will greatly disturb the mountain, and under the lateral bias pressure on the deeply buried side, it is easy to cause landslides on the side slope of the tunnel, tunnel collapse or the tunnel entrance section. Therefore, the construction safety of bias tunnel openings is the focus of tunnel construction. [0003] At present, pipe sheds are often used for early support before the excavation of the bias-pressured tunnel entrance. For example, the ap...

AI Technical Summary

Problems solved by technology

[0005] 1. Before the construction of the pipe shed, the opening of the mountain is excavated, which will damage the original ecology, disturb the original mountain, and affect the stability of the original mountain

[0006] 2. Only backfilling is used to balance the bias pressure of the tunnel entrance section, and the anti-bias pressure ability is limited, so it is not suitable for tunnels with large bias pressure

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