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Tunnel face stability calculation method taking seepage force into consideration

A calculation method and technology of permeability force, applied in the field of tunnel face stability calculation considering permeability force, which can solve the problems of few studies on water-rich strata and not many working faces of mining tunnels.

Active Publication Date: 2018-11-23
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

At present, there are many studies on the stability of the excavation face of shield tunneling tunnels, mainly by reducing the support pressure ratio, limit analysis upper limit method and limit equilibrium method, etc.; but there are not many studies on the stability of the face of mining tunnels, especially Water-rich formations are rarely studied

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  • Tunnel face stability calculation method taking seepage force into consideration
  • Tunnel face stability calculation method taking seepage force into consideration
  • Tunnel face stability calculation method taking seepage force into consideration

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Embodiment Construction

[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0064] see figure 1 , the project example is an underwater tunnel, which is constructed using the three-step method, the height of the upper step is D=4.07m, the buried depth of the tunnel is H=16.9m, and the internal friction angle of the surrounding rock is 25°, the cohesion c of the surrounding rock is 150kPa, the permeability coefficient is 0.000003125m / s, and the effective gravity of the surrounding rock is 13kN / m 3 , the weight of water is 10kN / m 3 , the water level is at a distance H from the vault w =25.9m.

[0065] Using the calculation method of the tunnel face stability considering the penetration force of the present invention, the steps are as follows:

[0066] (1) Determine the geometric relationship between the scope of the surrounding rock damage body spreading to the surface and the parameters of the tunnel excavation hei...

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Abstract

The invention discloses a tunnel face stability calculation method taking seepage force into consideration. The method mainly comprises the following steps of (1) according to parameters such as a tunnel burial depth, an excavation size and the like, determining a geometric relation among the tunnel burial depth, the excavation size and a damage range; (2) according to a seepage balance equation and in combination with numerical simulation software, obtaining average seepage force in the damage range; (3) according to an energy conservation principle, obtaining a virtual support force expression of a tunnel face; and (4) reducing surrounding rock parameters in combination with a strength reduction method, so that virtual support force is zero, and a reduction coefficient at the moment is atunnel face stability coefficient. The method disclosed by the invention can be applied to the tunnel face stability analysis of underground building structures such as mining roadways, hydraulic tunnels, metros and the like during consideration of the action of the seepage force under the water level, and a reference is provided for support reinforcement of the tunnel face.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a calculation method for tunnel face stability considering seepage force. Background technique [0002] There are many cases of landslides due to the instability of the face, especially in water-rich areas. Due to the weakening and seepage of water, the instability and collapse of the face are exacerbated. The stability of the surrounding rock near the face of the tunnel is currently the key problem and the core control factor in the tunnel engineering, especially the construction of water-rich tunnels in weak and broken sections and underwater tunnels. It has attracted more and more attention from the academic and engineering circles. Application problems need to be solved urgently. Therefore, it is of great theoretical significance and engineering application value to carry out the stability research on the face of rich water tunnels. At present, there...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 安永林李佳豪岳健欧阳鹏博胡文轩曾贤臣
Owner HUNAN UNIV OF SCI & TECH
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