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Tunnel face support and reinforcement parameter design method

A parameter design, face technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve the problems of difficult to ensure the safety of tunnel face construction, no given support parameter table, etc., to reduce engineering costs, guarantee The effect of construction safety

Active Publication Date: 2018-11-06
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

At present, the design of tunnel support structure parameters is mainly carried out on the basis of experience and according to the engineering analogy method. Level, Ⅴ, and Ⅵ levels, and then the initial support design parameters are given according to the tunnel span and the corresponding surrounding rock level; for the parameters of the support and reinforcement of the tunnel face, the corresponding support parameter table is not given in the code; In the actual design and construction, most of them are determined according to the experience of engineers, so it is difficult to guarantee the construction safety of the tunnel face

Method used

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  • Tunnel face support and reinforcement parameter design method

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Embodiment 1

[0087] see figure 1 , shotcrete is used for strengthening the face of the tunnel, and the shotcrete is proposed to be C20, and the compressive strength of the shotcrete is σ c is 10MPa, the shear strength τ of shotcrete s =0.43σ c =4.3MPa=4300kPa; shear angle α of shotcrete s = 30°, then according to step (a) in step 3, the minimum thickness of shotcrete should satisfy the following formula:

[0088]

Embodiment 2

[0090] see figure 2 , the face of the face is reinforced by front anchor rods, and the diameter of the anchor rods is d A =0.022m, the tensile strength σ of the bolt body A =400MPa, the length of the anchorage section of the bolt is l A =4m, horizontal distance between bolts s h =1m, the vertical distance between anchor rods s v =0.8m, bolt hole diameter D A =0.1m, the ultimate bond strength τ between the hole wall of the bolt hole and the grouting body A =0.65MPa, then according to step (b) in step 3, when the bolt itself is damaged:

[0091]

[0092] The bond failure of the anchor rod means that the bond force between the mortar anchor rod and the hole wall is insufficient and the anchor rod is damaged. The pull-out force of the anchor rod is:

[0093] T A = πD A l A τ A ;

[0094] in:

[0095] T A ——The pullout force of the anchor, that is, the anchoring force of the anchor;

[0096] D. A ——Diameter of bolt hole, take D in this design A = 100mm = 0.1m; ...

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Abstract

The invention discloses a tunnel face support and reinforcement parameter design method. The tunnel face support and reinforcement parameter design method mainly comprises the following steps that (1), according to the parameters such as tunnel burial depth and excavation size, the geometric relationship among tunnel burial depth, excavation size and failure range is determined; (2), according tothe principle of conservation of energy, the pressure of tunnel face surrounding rock is obtained; (3), according to a shear-slip method, the resistance of the tunnel face support is obtained, such asthe resistance of a spray layer and the resistance of an anchor rod; and (4) by comparing the pressure of tunnel face surrounding rock and the resistance of the tunnel face support, whether the support reinforcement is safe or not can be judged; and the tunnel face support and reinforcement design parameters are further optimized. The tunnel face support and reinforcement parameter design methodprovides a calculation method for judging the safety of tunnel face support and reinforcement parameters, changes the current situation that the design of tunnel palm surface support and reinforcementrelies on experience for a long time, and realizes the quantitative design of tunnel face support and reinforcement parameters.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a parameter design method for tunnel face support and reinforcement. Background technique [0002] Tunnel collapse accidents due to instability of the tunnel face are commonly reported, such as the collapse of Funing No. 1 tunnel on the Yunnan-Guizhou Railway. And application problems also need to be solved urgently. At present, the design of tunnel support structure parameters is mainly carried out on the basis of experience and according to the engineering analogy method. Level, Ⅴ, and Ⅵ levels, and then the initial support design parameters are given according to the tunnel span and the corresponding surrounding rock level; for the parameters of the support and reinforcement of the tunnel face, the corresponding support parameter table is not given in the code; In the actual design and construction, most of them are determined according to the experience of engin...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D20/00E21D11/00
CPCE21D11/00E21D11/10E21D20/00
Inventor 安永林欧阳鹏博岳健胡文轩
Owner HUNAN UNIV OF SCI & TECH
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