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Tunnel double-layer preliminary support dynamic generation method and device

A technology of initial support and dynamic generation, applied in tunnels, tunnel linings, mining devices, etc., can solve the problems of inability to achieve systematic and normative dynamic design, inability to achieve refined design and construction, and reduce replacement risk, preventing the deformation and encroachment of surrounding rock, and reducing the effect of project cost

Active Publication Date: 2021-02-09
CHINA RAILWAY ECONOMIC & PLANNING RES INST
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for dynamically generating double-layer initial support of a tunnel, the purpose of which is to solve the problem that the existing technology cannot achieve refined design and construction, Defects that cannot realize systematic and normative dynamic design

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  • Tunnel double-layer preliminary support dynamic generation method and device
  • Tunnel double-layer preliminary support dynamic generation method and device
  • Tunnel double-layer preliminary support dynamic generation method and device

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Embodiment 1

[0052] A method for dynamically generating double-layer primary support for tunnels (a dynamic design method for double-layer primary support for tunnels with high geostress soft rock), such as image 3 , Figure 5a , Figure 5b shown. Its implementation method is:

[0053] 1) Based on the geological survey data, adopt the design method combining theory and experience to design the double-layer primary support structure, determine the initial values ​​of the first-layer support parameters and the second-layer support parameters, and the equivalent stiffness of the double-layer primary support K d =λ 1 K 1 +λ 2 K 2 , K 1 、K 2 are the initial support stiffness of the first layer and the second layer respectively; λ 1 , lambda 2 are the initial support structure parameters of the first layer and the second layer respectively.

[0054] 2) Construct the first layer of support parameters according to the design plan, such as Figure 4 As shown, real-time monitoring of t...

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Abstract

The embodiment of the invention provides a tunnel double-layer preliminary support dynamic generation method. The method comprises the following steps that the deformation U<c> of a first-layer support is monitored in real time, and the unit of the U<c> is mm; a relation curve of the U<c> and the time t is drawn according to the U<c>, the unit of t is d, and d is a day; a function U<c>=f(t) is obtained according to the relation curve, the deformation acceleration d<2>U<c> / dt<2> is calculated according to the function, and the unit of <2>U<c> / dt<2> is mm / d<2>; and the U<c> is compared with an initially designed first-layer support deformation limit value U, the unit of U is mm, and the first-layer support and a second-layer support are processed according to the comparison value of the U<c>and U and the calculated value of the deformation acceleration. According to the method, the design is corrected in time, and structural or material parameters such as the rigidity of the second-layer primary support are enhanced, so that the effects of stabilizing surrounding rock, preventing surrounding rock deformation invasion and the like, reducing the support replacement risk, ensuring theconstruction period and reducing the construction cost are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel structure design, in particular to a method and device for dynamically generating double-layer initial support of a tunnel. Background technique [0002] With the continuous development of road traffic and rail traffic in our country, tunnel engineering technology is becoming more and more mature, and various types of tunnels are being used more and more. According to the different construction methods of tunnel engineering, the existing tunnel engineering construction methods usually include open cut method, shield method, mining method, immersed tube method, etc. Among them, the mining method is a relatively traditional and widely used tunnel engineering construction method. method. For the tunnel engineering constructed by the mining method, the initial support of the tunnel refers to the timely support to control the deformation of the surrounding rock and prevent the collapse after the excava...

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Application Information

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IPC IPC(8): E21F17/18E21D11/00G06F30/13
CPCE21F17/18E21D11/00G06F30/13
Inventor 刘喆
Owner CHINA RAILWAY ECONOMIC & PLANNING RES INST