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Method for judging weak surrounding rock tunnel primary support cavity

A technology for primary support and weak surrounding rock, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve problems such as low efficiency and cumbersome methods, and achieve convenience. The effect of discovering and increasing the horizontal detection range

Pending Publication Date: 2021-08-06
中铁隧道局集团建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a method for identifying initial support voids of tunnels with weak surrounding rocks that can efficiently complete the identification work, aiming at the cumbersome and low-efficiency problems of the traditional method for identifying the initial support voids of tunnels with weak surrounding rocks Methods

Method used

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  • Method for judging weak surrounding rock tunnel primary support cavity
  • Method for judging weak surrounding rock tunnel primary support cavity
  • Method for judging weak surrounding rock tunnel primary support cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A method for identifying primary support voids in weak surrounding rock tunnels, comprising:

[0067] For directly accessible areas:

[0068] The area that is more than 25 cm away from the steel arch is the area where the initial support can directly contact. The area that can be directly contacted is tested by tapping from one end to the other end along the arch direction of the initial support. Drilling treatment. If there is a fall of virtual ballast at the drilling position, it is judged that the position of the cavity is inside the primary support; There are no holes.

[0069] For areas not directly accessible:

[0070] Step 1. The area less than 25 cm away from the steel arch is the area where the initial support cannot be directly contacted. For the area that cannot be directly contacted, set a drilling point every less than 100 cm along the arch direction of the initial support. When encountering the connection of the steel arch frame, an additional drilling...

Embodiment 2

[0073] Replace step 1 of Example 1 for areas that cannot be directly contacted with: the area that is less than 25 cm away from the steel arch is the area that cannot be directly contacted by the initial support, and the area that cannot be directly contacted is along the arch direction of the initial support Set a drilling point at a position less than 100 cm, and set a drilling point at the connection of the steel arch frame, and drill all the drilling points. The drilling angle is 60° and the depth is 30°. cm.

[0074] The rest of the parameters are exactly the same as in Embodiment 1, and the operation method and identification method are also completely the same.

Embodiment 3

[0076] Replace step 1 of Example 1 for areas that cannot be directly contacted with: the area that is less than 25 cm away from the steel arch is the area that cannot be directly contacted by the initial support, and the area that cannot be directly contacted is along the arch direction of the initial support Set a drilling point at a position less than 100 cm, and set one more drilling point at the joint of the steel arch frame, and perform drilling processing on all drilling points. The drilling angle is 45° and the depth is 25°. cm.

[0077] The rest of the parameters are exactly the same as in Embodiment 1, and the operation method and identification method are also completely the same.

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Abstract

The invention discloses a method for judging a weak surrounding rock tunnel primary support cavity. The method comprises the steps of performing knocking detection on an area which can be in direct contact with a primary support, performing drilling treatment on a position where an empty sound appears, and judging the position of the cavity according to whether virtual ballast falls off or not after drilling; arranging drilling points in an area which cannot be in direct contact with the primary support according to a certain distance, and the certain distance being smaller than 100 cm; drilling a drilling point, preliminarily judging according to the drilling speed of a drill bit during drilling, drilling a second hole at a position 10 to 15 cm above the drilling point when the drill bit at the drilling position is too fast in instant drilling and virtual ballast falls off at the drilling position; and judging the position of the cavity according to the drilling speed of the drill bit when the second hole is drilled. According to the method for judging the weak surrounding rock tunnel primary support cavity, the interior of the primary support can be more comprehensively checked and judged.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for identifying primary support voids of weak surrounding rock tunnels. Background technique [0002] The initial support of the tunnel is the main structure of the tunnel. In order to ensure the stability of the initial support in the weak surrounding rock area, the combination of the steel arch frame and the shotcrete net is usually used as the initial support. Before it is firmly combined with the weak surrounding rock behind it, the steel arch will be used as auxiliary support. Because of the blocking of the steel arch and the metal mesh in the anchor shotcrete, the concrete behind the steel arch and the metal mesh is often not fully sprayed and it is easy to produce cavities; or in the process of concrete spraying, the upper concrete due to gravity The fall caused a void to form between the concrete and the soil layer behind the primary supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N19/08
CPCG01N29/045G01N19/08G01N2291/0289
Inventor 陈世凯肖君枝许殿瑞覃福进邢利科彭绍玉黄先颖谢如才张成伟刘雷高权
Owner 中铁隧道局集团建设有限公司
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