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

A technology of rock unloading and tunnel excavation, applied in tunnels, temporary shields, mining equipment, etc., can solve problems such as engineering safety, quality, progress and economic losses, tunnel shallow buried bias, waste of construction time, etc., to achieve The effect of preventing excessive deformation and collapse of the tunnel, saving the cost of temporary support measures, and enhancing the self-stabilization ability
CN104500079AInactive Publication Date: 2015-04-08POWERCHINA CHENGDU ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA CHENGDU ENG
Publication Date
2015-04-08
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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