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Single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels

A single-track railway, rockburst technology, applied in tunnels, tunnel lining, earthwork drilling, etc., can solve the problem of lack of rockburst-proof support structure system, and achieve the effect of ensuring stability and safety, and strong practical operability

Inactive Publication Date: 2018-09-11
CHINA RAILWAY NO 17 BUREAU GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the existing rockburst prediction and treatment, which are all aimed at conventional rockburst prevention and control measures, and lack the technical problem of rockburst prevention support structure systems for different rockburst intensity levels, the present invention provides a method corresponding to different rockburst intensity levels. Rock Burst Prevention Support Method for Single Track Railway Tunnel

Method used

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  • Single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels
  • Single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels
  • Single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels

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Embodiment 1

[0024] The explosive intensity level is judged according to existing methods such as advanced geological forecast, microseismic monitoring and site characteristics:

[0025] The specific support steps for the minor rockburst section are as follows. The excavation cycle footage of the tunnel is controlled to be 3m. After each cycle of excavation, blasting, risk removal and slag discharge, ①spray high-pressure water on the face of the tunnel and the wall of the tunnel to soften the surface to release the surrounding rock. rock stress. ②After the rockburst state basically subsided, the initial spraying of C25 concrete was carried out on the excavation surface to play the role of initial support. ③The arch wall is set with 2m long Φ22 mortar anchor rods, with a spacing of 2m×2m (ring×longitudinal), and φ6 steel mesh is hung with a grid spacing of 25×25cm. ④ Re-spray C25 concrete to the design thickness.

[0026] The specific support steps for the moderate rockburst section are a...

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Abstract

The invention particularly relates to a single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels; different support methods are utilized for thesingle-line railway tunnel under slight rock burst, medium rock burst and strong rock burst respectively, the slight rock burst section utilizes spraying high-pressure water on the rock surface, primary spraying concrete, and arranging a mortar anchor rod and a steel bar net support; the medium rock burst section utilizes spraying high-pressure water on the rock surface, primary spraying steel fiber concrete, and arranging a expansion type pre-stressed hollow anchor rod and a steel bar net support; the strong rock burst utilizes arranging an advanced pre-stressed release hole and an advancedanchor rod, injecting high-pressure water, primary spraying steel fiber concrete, erecting a steel arch frame, arranging an expansion shell type pre-stressed hollow anchor rod and a steel bar net support; explosion pits are disposed according to the depth of the explosion pits; According to the invention, a supporting method aiming at the anti-rock-burst of a single-line railway tunnel is systematically provided, the method has distinct gradation and strong practical operability, and can effectively guarantee the stability and the safety of construction under the rock burst condition of a single-line railway tunnel.

Description

technical field [0001] The invention relates to deep-buried hard rock tunnel projects such as transportation, mining, water conservancy and hydropower, etc., is applicable to the field of rockburst construction of single-track railway tunnels, and specifically relates to a rockburst-proof support method for single-track railway tunnels corresponding to different rockburst intensity levels. Background technique [0002] With the rapid development of my country's railway construction, especially the extension of the network to the west, more and more tunnels with high ground stress have been encountered, and the problem of rockburst has become more and more prominent. Rockburst occurs in areas with high ground stress. Because the excavation of the tunnel destroys the original equilibrium state, the energy is suddenly released, causing instant damage to the rock mass, mainly manifested as spalling, partial collapse, and ejection. Rockbursts have seriously threatened the safety ...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18E21D20/02
CPCE21D11/107E21D11/10E21D11/18E21D20/02
Inventor 涂齐亮钟传江闫苏涛姜育科杨林栗斌潘朋郑宗溪
Owner CHINA RAILWAY NO 17 BUREAU GRP
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