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Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section

A technology for coal-measure strata and super-large cross-section, which is used in earth-moving drilling, sealing/packing, wellbore/well components, etc., and can solve the technical method of incomplete coal and gas burst tunnel construction, and gas tunnel construction can be used for reference It can reduce the amount of fracturing preparation work, improve the efficiency of tunnel driving, and have a strong pressure bearing capacity.

Active Publication Date: 2016-07-13
CHINA RAILWAY 18TH BUREAU GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most of the gas tunnels currently under construction in China are high-gas, there are few gas outbursts and gas outbursts, and conventional coal mine roadway excavation is generally adopted, with low construction speed and long construction period
According to incomplete statistics, domestic tunnels involving the danger of coal and gas outbursts include Faer Highway Tunnel and Wumengshan Railway Tunnel, etc., but a set of technical methods for the construction of coal and gas outburst tunnels has not been fully formed. less experience

Method used

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  • Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section
  • Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section
  • Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section

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Effect test

Embodiment 1

[0026] Example 1, a construction method for a super-large-section tunnel passing through coal-measure strata, including the steps of hydraulic fracturing and gas extraction, the method is used for excavation of a tunnel that crosses a total of 9 coal seams from K1 to K9 in a certain design, according to the geological The true thickness and spacing of K1~K9 coal seams in the survey results, such as figure 1 Shown, where the unit of thickness and spacing is m.

[0027] According to the above-mentioned geological prospecting data of the coal-measure strata section to be crossed, it is determined that the 9 coal seams in the coal-measure strata section adopt two concentrated fracturing methods to perform multiple fracturing on multiple coal seams. ~K4 coal seam, the second concentrated fracturing is carried out on K3~K1 coal seam.

[0028] When the minimum vertical distance from the tunnel excavation face to the roof of the K9 and K3 coal seams is 10m, the average coal seam thic...

Embodiment 2

[0034] Example 2, see Figure 4 , a concentrated hydraulic fracturing drilling and sealing structure in which super-large-section tunnels pass through multiple coal seams, including a plurality of fracturing drillings 1 corresponding to the number of times of centralized fracturing, and sealing holes are correspondingly arranged in each fracturing drilling 1 device, and form a sealing structure through the corresponding sealing device, the sealing device extends from the coal seam roof 2 direction into the corresponding coal seam 3, the sealing device includes a fracturing pipe 4, a grouting pipe 5, and a device is formed at the inner end of the fracturing pipe 4 The flower tube section 4a of fixed length, the flower tube section 4a is divided into the inner section of the flower tube and the outer section of the flower tube by the binding part through the horsetail 6, the inner section of the flower tube is used for hydraulic fracturing, and the outer wall of the outer section...

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Abstract

The invention discloses a construction method and a hole sealing structure for a super-large section tunnel for traversing a coal measure strata section. The method comprises a hydraulic fracturing step and a gas extracting step, wherein the hydraulic fracturing step comprises the following processes: carrying out concentrated fracturing on a plurality of fracturing holes in sequence by fracturing units arranged in the same region, determining the concentrating frequency for concentrated fracturing of the coal measure strata section, at least two to-be-traversed coal seams for primary concentrated fracturing before fracturing, a gas outburst seam and the drilling position and depth of primary concentrated fracturing; and the gas extracting step comprises concentrated extraction of more than two coal seams and individual extraction of a to-be-excavated coal seam. The hole sealing structure is formed through a hole sealing device; a floral tube section is formed at the inner end of a fracturing tube of the hole sealing device and is divided into an inner section of the floral tube and an outer section of the floral tube; at least one gauze is wound on the outer wall of the outer section of the floral tube; and a hole sealing section comprises a cement paste solidifying section and a polyurethane sealing section. The construction method and the hole sealing structure have the beneficial effects that the condition that the tunnel quickly and safely passes through the coal measure strata section can be ensured by a tunneling method; and the hole sealing structure is good in hole sealing effect and high in loading capacity.

Description

technical field [0001] The invention relates to a super-large-face tunnel excavation technology, in particular to a construction method for a super-large-section tunnel passing through a coal-measure formation section and a hydraulic fracturing drilling and sealing structure used in the method. Background technique [0002] With the development of my country's transportation industry, more and more tunnels are built through gas-containing strata, and the number of high-gas tunnels is also increasing. Although most of the gas tunnels currently under construction in China are high-gas, there are few gas outbursts and gas outbursts, and conventional coal mine roadway excavation is generally used, with low construction speed and long construction period. According to incomplete statistics, domestic tunnels involving the danger of coal and gas outbursts include Faer Highway Tunnel and Wumengshan Railway Tunnel, etc., but a set of technical methods for the construction of coal and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B33/13
CPCE21B33/13E21B43/006E21B43/26E21F7/00
Inventor 曹美俊邹永红王强李林林王江代黔彪李兆奎周盛龙
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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