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A method for calculating the cohesive force between horizontally layered surrounding rock layers of an anchor beam structure

A calculation method and horizontal layer technology, applied in the calculation of the safe excavation span of the horizontal layered surrounding rock tunnel roof, and the calculation of the cohesion between the horizontal layered surrounding rock layers of the anchor beam structure, can solve the problem of ignoring the interlayer of the roof rock mass Problems such as cohesion, poor match between the model and the actual situation, and impact on construction costs and progress, achieve the effect of simple and easy-to-understand models, reduce construction costs, and improve excavation progress

Active Publication Date: 2019-01-22
CHANGAN UNIV
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Problems solved by technology

Although some results have been obtained, the cohesion between the layers of the roof rock mass is generally ignored in the construction design, and the model at different stages of the construction is not in good agreement with the actual situation, which makes the calculation of the critical excavation span parameters in the tunnel construction and the actual construction There are large differences on site, which affects the construction cost and progress

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  • A method for calculating the cohesive force between horizontally layered surrounding rock layers of an anchor beam structure
  • A method for calculating the cohesive force between horizontally layered surrounding rock layers of an anchor beam structure
  • A method for calculating the cohesive force between horizontally layered surrounding rock layers of an anchor beam structure

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[0038] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and engineering examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] Figure 1-3 The schematic diagrams of the surrounding rock sections in the initial stage, intermediate stage, and later stage of tunnel excavation are given. 5 and 6 in the figure represent the upper rock mass and the lower rock mass respectively. Indicates the tunnel profile.

[0040] figure 1 In the initial stage of tunnel excavation, the surrounding rock is less disturbed, and the rock masses at both ends of the tunnel roof still have good integrity. At this time, the rock masses above the roof are constrained by the upper and lower strata It cannot be rotated, nor can it move up and down, left ...

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Abstract

The invention discloses a method for calculating the cohesive force between horizontally layered surrounding rock layers of an anchor beam structure, in which the mechanics calculation model of the tunnel roof in different construction stages is equivalent to the anchor beam model in the initial excavation stage, and a calculation model of the cohesive force between horizontally layered surrounding rock layers and a concrete calculation formula of the cohesive force is simultaneously provided . By embedding the theoretical model of cohesive force between horizontally stratified surrounding rock layers into the traditional excavation width model, the critical excavation span of horizontal stratified surrounding rock tunnel is obtained, which is consistent with the actual construction, and is of great significance to guide the design and construction of horizontal stratified surrounding rock tunnel.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction in civil engineering, and in particular relates to a method for calculating the safe excavation span of the roof of a horizontal layered surrounding rock tunnel considering the interlayer cohesion, in particular to a horizontal layered surrounding rock interlayer of an anchor beam structure Cohesion Calculation Method. Background technique [0002] A layered rock mass is a type of sedimentary rock that has a layered structure. Layered rock masses are widely distributed in the world, accounting for about 66% of the total land area. my country's layered rock masses are distributed more widely, reaching 77% of the country's land area, mainly concentrated in the southwest, central China and northern Shaanxi. Due to the typical layered structure of layered rock mass, not only the deformation and strength properties have obvious anisotropy, but also the failure mechanism and mode of rock m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F2119/06G06F30/20
Inventor 罗彦斌陈建勋王利宝张馨予巩海筱
Owner CHANGAN UNIV
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