Tunnel excavation method in shallow-buried bias-pressure toppling-deformation bulk solid and strong-unloading rock structure

Abstract

The invention relates to a tunnel excavation method in the shallow-buried bias-pressure toppling-deformation bulk solid and strong-unloading rock structure, in particular to the tunnel excavation method in shallow-buried bias-pressure toppling-deformation bulk solid and strong-unloading rock structure in the field of tunnel construction and aims to reduce temporary support workload and prevent landslide triggered by tunnel excavation and oversize deformation of tunnels. The method includes steps of a, dividing a tunnel to be excavated into an upper step, a middle step, a lower step and an inverted arch; b, excavating the upper step and supporting; c, excavating the middle step and supporting; d, excavating the lower step and supporting; e, excavating the inverted arch and supporting. According to self-stabilization of the surrounding rock the corresponding tunnel excavation way is determined, slope excavation is realized by sufficiently utilizing self-stabilization of the surrounding rock and temporary support is reduced. By the tunnel excavation method, construction is speeded up, investment is reduced and construction safety is ensured.

Description

technical field [0001] The invention relates to a tunnel excavation method in a shallow-buried bias-pressure dumped deformed loose body and a strong unloaded rock structure, in particular to a shallow-buried biased dumped deformed loose body and a strongly unloaded rock structure applied in the field of tunnel construction Tunnel excavation method in . Background technique [0002] In the construction of tunnels in deep mountains and valleys, especially on steep bank slopes, the main problem is how to solve the problem of shallow buried tunnel bias. For example, the surrounding rock on one side of the tunnel is relatively good, and the tunnel arch and the other side of the tunnel The surrounding rock is poor and there is no self-stabilization ability. In this case, if the construction method is improper during the construction process, there will be excessive deformation of the tunnel, tunnel collapse and collapse of the roof, and even induce slope collapse and form high slo...

AI Technical Summary

Problems solved by technology

[0002] In the construction of tunnels in deep mountains and valleys, especially on steep bank slopes, the main problem is how to solve the problem of shallow buried tunnel bias. For example, the surrounding rock on one side of the tunnel is relatively good, and the tunnel arch and the other side of the tunnel The surrounding rock is poor and there is no self-stabilization ability. In this case, if the construction method is improper during the construction process, there will be excessive deformation of the tunnel, tunnel collapse and collapse of the roof, and even induce slope collapse and form high slope problems. , which makes the project safety, quality, schedule and economy affected and lost to varying degrees

The tunnel excavation method in the existing technology does not make full use of the self-stabilizing ability of the rock and soil to excavate the temporary excavation slope of the partial excavation in the tunnel. Excavate the slope for temporary support. In the excavation construction of the next cycle, the temporary support of the previous cycle needs to be excavated. During the construction process, a lot of construction time was wasted, the construction progress was slow, and a lot of financial and material resources were wasted. The current construction technology is not suitable for the tunnel excavation method with severe shallow buried eccentric tunnel section geological conditions.

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