TBM grading anti-blocking and de-trapping construction method for soft and broken stratum tunnel

A construction method and stratum technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as TBM stuck disasters, difficulties in safe and efficient excavation, etc., to reduce material and labor costs, economical and reasonable engineering construction, and shorten construction period Effect

Active Publication Date: 2021-08-03
STATE KEY LAB OF SHIELD & TUNNELING TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a construction method for TBM graded anti-jamming and release of tunnels in soft and broken strata to solve the problem that the collapse of the surrounding rock in weak and broken stratum can easily lead to the disaster of TBM jamming and the difficulty of safe and efficient excavation. The specific scheme is as follows:

Method used

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  • TBM grading anti-blocking and de-trapping construction method for soft and broken stratum tunnel
  • TBM grading anti-blocking and de-trapping construction method for soft and broken stratum tunnel
  • TBM grading anti-blocking and de-trapping construction method for soft and broken stratum tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1, when the crushing level of the surrounding rock is slightly broken, chemical grouting with glass fiber pipe 3 is used, the length of each glass fiber pipe 3 is 1m, and the length of the single glass fiber pipe 3 is extended with a sleeve, and the reinforcement depth in front of the cutter head 2 is not less than 3m.

Embodiment 2

[0036]Example 2, when the crushing level of the surrounding rock is moderately broken, chemical grouting is carried out through the glass fiber pipe 3 in front of the cutter head 2, and a first steel pipe shed 4 is added above the shield 1, and chemical grouting is carried out , the diameter of steel pipes used in the first steel pipe shed 4 is 42mm, the length is not less than 8m, and the distance is 1m. The installation range is the 90° fan-shaped area on the top of the shield 1.

Embodiment 3

[0037] Example 3, when the crushing level of the surrounding rock is severely broken, the position of the excavated pilot tunnel 5 is located at 12 o'clock above the shield 1, the surrounding of the pilot tunnel 5 is supported by HW150 steel 7, and a second tunnel is built on the top of the pilot tunnel 5. Steel pipe shed 6, and stabilize the surrounding broken ground by cement grouting. The diameter of the steel pipe in the second steel pipe shed 6 is 76mm and the length is not less than 10m.

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Abstract

The invention relates to a TBM grading anti-blocking and de-trapping construction method for a soft and broken stratum tunnel. The TBM grading anti-blocking and de-trapping construction method comprises the following steps that a corresponding relation is established through a wave velocity difference detected by a seismic wave detector and a rock quality index obtained by drilling and coring by an advanced drilling machine, and surrounding rock crushing grades are divided into four grade standards of slight crushing, medium crushing, serious crushing and extreme crushing; and different TBM anti-blocking and de-trapping methods are determined according to the different surrounding rock crushing grades. According to the TBM grading anti-blocking and de-trapping construction method, the surrounding rock crushing grades in front of the tunnel can be reasonably evaluated, a reasonable TBM anti-blocking and de-trapping method can be conveniently adopted in a construction site according to the surrounding rock crushing grades, the situation that the construction period is delayed due to frequent blocking or difficult de-trapping of a TBM caused by improper measures is avoided, and the construction efficiency of the TBM is improved.

Description

technical field [0001] The invention belongs to the technical field of TBM construction, and in particular relates to a TBM graded anti-jamming and release construction method for tunnels in weak and broken strata. Background technique [0002] With the vigorous development of my country's infrastructure industry, full-face rock tunnel boring machines (TBM) have been widely used in mountain tunnel construction. However, the geological conditions of mountain tunnels are complex and changeable, especially for weak and broken strata, surrounding rock collapse, TBM The situation of being stuck frequently occurs, which leads to the shutdown of the TBM and delays the construction period, which seriously restricts the efficiency of the TBM construction. Preliminary avoidance and rapid escape of TBM are the main measures to deal with the collapse of surrounding rock during excavation. However, there is currently no complete anti-blocking and releasing construction technology for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/087E21D9/06E21D11/10E21F17/18
CPCE21D9/0873E21D9/0657E21D11/105E21F17/18
Inventor 周建军李治国杨延栋陈雪峰温时雨潘东江卢高明张理蒙
Owner STATE KEY LAB OF SHIELD & TUNNELING TECH
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