Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pressure relief method of expansive tunnel surrounding rock

An expansive and surrounding rock technology, which is applied in tunnels, earth square drilling, mining equipment, etc., can solve problems such as unsatisfactory treatment effects of expansive rock (soil) bodies and threats to the safety of expansive rock (soil) bodies. To achieve the effect of solving stress concentration

Active Publication Date: 2020-01-10
RES INST OF HIGHWAY MINIST OF TRANSPORT
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment methods for tunnel expansive rock (soil) in the existing technology mainly adopt traditional engineering measures such as strengthening the strength of the lining structure and waterproofing and drainage. However, in many engineering practices, the treatment effect on expansive rock (soil) is still unsatisfactory, and expansive rock (soil) still poses a huge threat to engineering safety.
[0004]The method of drilling holes in the expansive rock (soil) mass of the surrounding rock of the tunnel for pressure relief and replacement has no relevant application cases in related industries and projects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pressure relief method of expansive tunnel surrounding rock
  • Pressure relief method of expansive tunnel surrounding rock
  • Pressure relief method of expansive tunnel surrounding rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1: A pressure relief method for expansive surrounding rock of an expansive tunnel. The disturbance range of the expansive surrounding rock caused by tunnel construction is ascertained, and the pressure relief and replacement range is initially determined. The disturbance range can be determined by common engineering techniques, such as Engineering geophysical prospecting technology, etc.

[0074] After the distribution range of the expansive rock mass is verified, a typical expansive rock test block is selected on site for testing to determine the natural compressive strength σ of the rock block ci , and calculate the following parameters of the rock-soil mass: rock-soil mass porosity n and expansion rate α, to determine whether pressure relief and replacement construction is required, if n≥α, no pressure relief and replacement construction is required, and if n<α, it is necessary to carry out Pressure relief and replacement construction.

[0075] Preliminar...

Embodiment 2

[0114] Example 2: Deeply buried rock tunnel, the surrounding rock at the arch waist is expansive rock mass. It is found that the depth of expansive rock mass loosening due to construction is 3m, and a 20cm sealing section is reserved at the end. The depth of the hole filling hole is H=3.2m, that is, the elastomer replacement material L=H-0.2=3.2-0.2=3m, and the range of pressure relief and replacement is preliminarily determined as the expansion range of the entire rock mass at the arch waist, and the calculated rock mass is not expanded Hourly volume V=28.73m 3 (The axial direction of the tunnel is analyzed with a unit length of 1m).

[0115] After ascertaining the distribution range of expansive rock mass, a typical expansive rock test block was selected on site for testing to determine the compressive strength σ of the rock mass ci , porosity n and expansion rate α, the test records the natural compressive strength σ of the embodiment rock test block ci =36.4MPa, the poro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a treatment method of expansive tunnel surrounding rock, in particular to a pressure relief method of the expansive tunnel surrounding rock. The method includes the followingsteps that (1) the disturbance range of the expansive surrounding rock caused by tunnel construction is proved; (2) the porosity n, the expansion rate alpha and the compressive strength sigmaci of anexpansive surrounding rock test block are determined through tests; (3) the pressure-relief replacement position and depth of the expansive surrounding rock are determined preliminarily; (4) the elasticity modulus Em and the compressive strength sigmacm of the expansive surrounding rock are calculated; (5) the elastomer replacement material type is selected; (6) the hole diameter, the hole depth,the hole number and the hole distance of pressure-relief replacement holes are determined through calculation. Compared with the prior art, the method has the beneficial effects that the expansive rock and earth mass is treated with the method for releasing and relieving the expansion stress, the expansion stress can be reduced or eliminated, and the treatment effect on the expansive rock and earth mass can be realized without a lot of manpower and material resources.

Description

technical field [0001] The invention relates to a treatment method for expansive tunnel surrounding rock, in particular to a pressure relief method for expansive tunnel surrounding rock. Background technique [0002] my country has a vast territory and complex and changeable engineering geological conditions. At present, the understanding of expansive rock (soil) is still immature, and a systematic theory and technical system have not been formed. The design and construction process relies more on engineering experience. The treatment methods for expansive rock (soil) in the project are also relatively traditional, mainly relying on previous engineering experience, that is, the method of engineering analogy, to take traditional engineering measures such as strengthening structural strength and waterproofing and drainage. Even so, the treatment effect is still not ideal, and the existence of expansive rock (soil) often leads to cracking or even destruction of the structure. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
CPCE21D9/00Y02E10/20
Inventor 许崇帮李磊秦幼林王华牢
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com