Unlock instant, AI-driven research and patent intelligence for your innovation.

Combined support method for high geostress soft rock tunnel

A technology of high ground stress and combined support, which is applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as excessive stress and simple strong support, and achieve the purpose of maintaining support, avoiding failure, and obviously economical benefit effect

Inactive Publication Date: 2019-06-28
LIAONING TECHNICAL UNIVERSITY
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a combined support method for high ground stress soft rock tunnels, through the synergistic effect of yielding bolts, sprayed rubber concrete, excavating pressure relief grooves, and timely strong support to solve the problem of simple support in support. Stress concentration problems caused by strong support and excessive stress

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
  • Combined support method for high geostress soft rock tunnel
  • Combined support method for high geostress soft rock tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The floor part width h=890cm of the high geostress soft rock tunnel, the arch wall part height l=720cm;

[0031] The yield anchors are driven into the arch wall part and the roof part of the high-geostress soft rock tunnel, and each yield anchor is divided into several groups, and the yield anchors of each group are located on a vertical section of the high-geostress soft rock tunnel, and It is distributed radially; in each group of yield anchors, the distance between the ends of two adjacent yield anchors located on the arch wall is 1-2m; the horizontal distance between two adjacent yield anchors is 1-2m ;The length of the anchor bolt is 4~5m;

[0032] The pressure relief groove is dug out in the arch wall part of the high ground stress soft rock tunnel, and the pressure relief groove is located between two adjacent yield bolts in each group of yield bolts; the height of the pressure relief groove from the floor part is 4m;

[0033] Crush and grind waste tires into ru...

Embodiment 2

[0038] Method is with embodiment 1, and difference is:

[0039] (1) The floor portion width h=850cm of the high geostress soft rock tunnel, and the arch wall portion height l=750cm;

[0040] (2) The height of each pressure relief groove from the bottom plate is 3m;

[0041] (3) In the concrete containing rubber powder, the rubber powder shall replace the fine sand according to the mixing amount of 15%;

[0042] (4) Concrete spray thickness 20cm containing rubber powder;

[0043] (5) The thickness of concrete with strength C25 is 28cm; the grid horizontal spacing of double-layer steel mesh is 1cm, and the vertical spacing is 15cm; the thickness of secondary masonry is 40cm.

[0044] Example 2

[0045] Method is with embodiment 1, and difference is:

[0046] (1) The floor portion width h=950cm of the high geostress soft rock tunnel, and the arch wall portion height l=700cm;

[0047] (2) The height of each pressure relief groove from the bottom plate is 5m;

[0048] (3) In ...

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

PropertyMeasurementUnit
Widthaaaaaaaaaa
Heightaaaaaaaaaa
Lengthaaaaaaaaaa
Login to View More

Abstract

Provided is a combined support method for a high geostress soft rock tunnel. The method comprises the following steps that (1) in an arch wall portion of the high geostress soft rock tunnel and a topplate portion, a pressure anchor is inserted, each pressure anchor is divided into several groups, and each group of the pressure anchor distributes in a radial shape; (2) the arch wall portion partially excavates a pressure relief groove; (3) used tires are crushed and ground into rubber powder with a particle size of 30 mesh, by an equal volume method, the rubber powder replaces 15-25% of fine sand as a fine aggregate, and the fine aggregate is used for making a concrete containing the rubber powder; (4) the concrete containing the rubber powder is sprayed on the arch wall portion, the top plate portion and the bottom plate portion; (5) an initial support layer and a timely strong support are placed on the rubber concrete layer. The method solves the stress concentration problem caused by the simple strong support and the excessive stress in the support, avoids the damage to the support structure, and reduces the maintenance and repair cost of the tunnel in the later period.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering and mining, in particular to a combined support method for high ground stress soft rock tunnels. Background technique [0002] Soft rock with high ground stress has the characteristics of high stress and low self-strength, which leads to poor self-stability, easy damage to supporting structures, and early construction of secondary lining. Both have the characteristics of high difficulty and low safety; the support principle of soft rock tunnel is different from that of hard rock tunnel. The support principle of hard rock tunnel is not to allow hard rock to enter plasticity, because hard rock will lose its Bearing capacity, while the plasticity of soft rock tunnels must be released in some form, so it is imminent to study the effect of pressure relief on high ground stress soft rock tunnels. [0003] In the traditional soft rock tunnel support, there are active support and passive suppo...

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
IPC IPC(8): E21D20/00E21D11/10E21D11/00
Inventor 易富侯朋杜常博李军
Owner LIAONING TECHNICAL UNIVERSITY