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

Tunnel construction method for side span non-filling type long and narrow shallow-bottom karst cave section

A technology for tunnels and karst caves, which is applied in tunnels, fillings, tunnel linings, etc., can solve the problems of unsuitable long, narrow, shallow-bottomed karst caves without filling, and no treatment measures are given, and achieves extensive reference value and practical value, and safety risks. The effect of low and fast construction speed

Active Publication Date: 2020-08-04
POWERCHINA CHENGDU ENG
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For unfilled narrow, long, shallow-bottomed karst caves, the above-mentioned "Code for Design of Highway Tunnels" did not give specific treatment measures
In addition, in the Q & A (JTG / TD70-2010) "14 Special Geological Design" chapter of "Detailed Rules for the Design of Highway Tunnels" involves several tunnel design methods for karst geological conditions, but these methods have specific applicable conditions and are not suitable for unfilled tunnels. Narrow and shallow-bottomed karst cave
Therefore, there is no tunnel construction method for the side-span non-filling type narrow and long shallow-bottom karst cave section in the prior art

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
  • Tunnel construction method for side span non-filling type long and narrow shallow-bottom karst cave section
  • Tunnel construction method for side span non-filling type long and narrow shallow-bottom karst cave section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0036] The unfilled narrow, long, shallow-bottomed karst cave in practice refers to: in the plan view, the karst cave is located on one side of the tunnel, part of the karst cave extends into the tunnel, and the direction of the karst cave intersects with the direction of the line at a small angle (greater than 0°, less than 30°) or Parallel to the line, the karst cave is in the shape of a long strip, the longitudinal length of the karst cave is not less than 3m, the width is 1-5m, and the karst cave invades the tunnel by 1-5m. In the longitudinal section, the height difference between the top of the cave and the road surface is more than 20m, the depth of the bottom of the cave to the road surface is not more than 60m, and the wall of the cave is basically vertical; the cave rocks are horizontally layered, thin to medium-thick, soft and hard interbedded...

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 discloses a tunnel construction method for a side span non-filling type long and narrow shallow-bottom karst cave section, and relates to the field of underground engineering. The invention aims to provide a construction method for the side span karst cave section of a tunnel under the specific geological condition of a non-filling type long and narrow shallow-bottom karst cave. According to the technical scheme, the tunnel construction method for the side span non-filling type long and narrow shallow-bottom karst cave section comprises the steps that a karst cave cavity in the lower portion of a tunnel excavation face is backfilled with cave slag, a karst cave opening is reinforced after danger is eliminated, a tunnel arch outside the karst cave cavity is subjected to advance support, tunnel excavation is conducted in a segmented circulating excavation mode, steel frames are erected along the tunnel arch and the whole section of a side wall, the tunnel arch and the sidewall are supported through anchor rods of a construction system, surrounding rock around the karst cave wall at the bottom of the tunnel is reinforced, a reinforced concrete slab at the bottom of thetunnel is constructed, a karst cave drainage pipe is constructed, the tunnel side karst cave is backfilled with concrete, and finally a tunnel secondary reinforced concrete lining and a road surface are constructed. The tunnel construction method is suitable for the design and construction of the side span non-filling type long and narrow shallow-bottom karst cave section.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a method for building a tunnel in a limestone area with karst caves. Background technique [0002] When building tunnels in limestone areas, it is easy to encounter caves. According to whether there is filling in the cave, the cave can be divided into filling cave and non-filling cave. In unfilled caves, due to differences in the size of the cave and the relative positional relationship between the cave and the tunnel, the treatment methods for the caves are different. The relevant content in the "14.3 Karst" part of the first volume of civil engineering (JTG3370.1-2018) of "Code for Design of Highway Tunnels" is: [0003] 14.3.1 According to the positional relationship between karst and tunnels, comprehensive treatment measures such as spanning, strengthening karst caves, backfilling karst caves, diverting and intercepting karst water, removing or reinforcing fillings, s...

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): E21D9/14E21D11/10E21D11/18E21D20/02E21F15/00E21F16/02
CPCE21D9/14E21D11/10E21D11/18E21D20/02E21F15/005E21F16/02
Inventor 吴学智曾建军李国庆王建黄鹏
Owner POWERCHINA CHENGDU ENG
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