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Rapid grouting and arching reinforcement method before tunnel excavation in stratum with poor irrigability and difficult self-stabilization

A tunnel and self-stabilizing technology, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve the problems of inability to meet the anti-seepage and stability requirements of tunnel excavation, difficult self-stabilizing stratum tunnels, poor irrigability, etc., to ensure safety. The effect of fast penetration, increasing slurry diffusion distance and increasing grouting hole spacing

Active Publication Date: 2021-03-26
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a rapid grouting reinforcement method before excavation of tunnels in poor groutable and difficult self-stabilizing strata, so as to solve the conventional excavation and reinforcement of tunnels in poor groutable and difficult self-stabilizing strata existing in the prior art The method cannot achieve fast and economical goals, and cannot meet the technical problems of anti-seepage and stability requirements for tunnel excavation

Method used

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  • Rapid grouting and arching reinforcement method before tunnel excavation in stratum with poor irrigability and difficult self-stabilization
  • Rapid grouting and arching reinforcement method before tunnel excavation in stratum with poor irrigability and difficult self-stabilization
  • Rapid grouting and arching reinforcement method before tunnel excavation in stratum with poor irrigability and difficult self-stabilization

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The tunnel to be excavated shall be reinforced before excavation, the tunnel excavation sideline 1, the tunnel face 6 and the tunnel bottom sideline 7 such as figure 1 shown.

[0044] A rapid grouting reinforcement method before excavation of a tunnel in a stratum with poor groutability and difficult self-stabilization, comprising the following steps:

[0045] (1) Divide into six reinforcement areas along the tunnel excavation sideline 1 on the inner side close to the tunnel excavation sideline 1;

[0046] The reinforced area includes the first reinforced area A, the second reinforced area B, the third reinforced area C, the fourth reinforced area D, the fifth reinforced area E and the sixth reinforced area F; Quantity can be divided according to need

[0047] (2) Reinforcement of the reinforcement area:

[0048] ① Drill the first group of flushing grouting holes 2 and drainage holes 3 in the first reinforcement area A on the inner side near the excavation sideline 1...

Embodiment 2

[0061] The tunnel to be excavated shall be reinforced before excavation, the tunnel excavation sideline 1, the tunnel face 6 and the tunnel bottom sideline 7 such as figure 2 shown.

[0062] A rapid grouting reinforcement method before excavation of a tunnel in a stratum with poor groutability and difficult self-stabilization, comprising the following steps:

[0063] (1) Divide five reinforcement areas along the tunnel excavation sideline 1 on the inner side close to the tunnel excavation sideline 1;

[0064] The reinforced area includes a first reinforced area A, a second reinforced area B, a third reinforced area C, a fourth reinforced area D and a fifth reinforced area E;

[0065] (2) Reinforcement of the reinforcement area:

[0066] ① Drill the first group of flushing grouting holes 2 and drainage holes 3 in the first reinforcement area A on the inner side near the excavation sideline 1 of the tunnel. The flushing grouting holes 2 and the drainage holes 3 are drilled ad...

Embodiment 3

[0079] The tunnel to be excavated shall be reinforced before excavation, the tunnel excavation sideline 1, the tunnel face 6 and the tunnel bottom sideline 7 such as figure 2 shown.

[0080] A rapid grouting reinforcement method before excavation of a tunnel in a stratum with poor groutability and difficult self-stabilization, comprising the following steps:

[0081] (1) Divide into seven reinforcement areas along the tunnel excavation sideline 1 on the inner side close to the tunnel excavation sideline 1;

[0082] The reinforcement area includes the first reinforcement area A, the second reinforcement area B, the third reinforcement area C, the fourth reinforcement area D, the fifth reinforcement area E, the sixth reinforcement area F and the seventh reinforcement area Reinforced area G;

[0083] (2) Reinforcement of the reinforcement area:

[0084] ① Drill the first group of flushing grouting holes 2 and drainage holes 3 in the first reinforcement area A on the inner sid...

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Abstract

The invention provides a method for rapid grouting and arching for reinforcing of a stratum with poor groutability and difficult self-stabilization before tunnel excavation, relates to the technical field of tunnel and underground construction, and solves the technical problems that the rapid and economic aims cannot be achieved for a tunnel in the stratum with poor groutability and difficult self-stabilization according to a conventional excavation and reinforcement method, and the anti-seepage and stability requirements of tunnel excavation cannot be met. The method comprises the following steps that (1) the inner side close to a tunnel excavation side line is divided into a plurality of reinforcing areas along the tunnel excavation side line; and (2) the reinforcing areas are reinforced. The method is used for rapid grouting for reinforcing of the stratum with poor groutability and difficult self-stabilization before tunnel excavation, the problems of tunnel stability and seepage prevention during the period that construction of a lining is not completed after the tunnel is excavated are solved, the tunnel excavation efficiency is improved, and it is guaranteed that the tunnel is through safely and rapidly.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a rapid grouting reinforcement method before excavation of tunnels in strata with poor groutability and difficult self-stabilization. Background technique [0002] As a passage through natural obstacles such as mountains, rivers, and straits, tunnels are widely used in water conservancy and hydropower projects, transportation projects, water diversion projects, and mining projects. During tunnel excavation, unfavorable geological bodies that are difficult to self-stabilize are usually encountered, such as fine sand, clay, sandy dolomite and other strata, which are characterized by poor self-stabilization ability and may collapse during excavation. It is more serious and often becomes a key factor restricting tunnel excavation. [0003] For difficult self-stabilizing formations with good groutability, advanced grouting with cement-based materials is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10E21B21/00E21B21/16
CPCE21B21/00E21B21/16E21D9/001E21D9/002E21D11/10
Inventor 邢占清李金霖符平黄立维
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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