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Method for treating tunnel collapse roof fall by using advanced small pipe pre-grouting technology

An advanced small conduit and pre-grouting technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve problems such as excessive gelation, delay the gelation time, compensate for the stability of surrounding rock, and improve strength and durability. Effect

Active Publication Date: 2019-04-05
GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the above problems and provide a method for treating tunnel collapse and roof caving by adopting an advanced small conduit pre-grouting process, which can solve the problem of too fast gelation of traditional cement-water glass grout to a certain extent and improve structural stability. and durability with reduced construction costs

Method used

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  • Method for treating tunnel collapse roof fall by using advanced small pipe pre-grouting technology

Examples

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Effect test

Embodiment 1

[0036] A method for treating tunnel collapse and roof fall by adopting an advanced small conduit pre-grouting process, comprising the following steps:

[0037] S1. Preliminary preparation: backfill the surface subsidence pit with grout, then complete the hardening and sealing treatment of the surface gullies, and do a good job of draining the gullies to ensure that the water in the gullies does not directly infiltrate.

[0038] S2. Advance small conduit pre-grouting: use the advanced small conduit pre-grouting process for construction.

[0039] The two-liquid grouting material includes liquid A and liquid B, and the liquid B is water glass; the liquid A includes the following components in parts by weight: 700 parts of cement, 200 parts of fly ash, 100 parts of bentonite, phosphoric acid 20 parts of disodium hydrogen, 10 parts of aluminum oxide, 10 parts of sodium hydroxide, and 1000 parts of water; uniformly mix liquid A and liquid B at a volume ratio of 1:0.5 to obtain the d...

Embodiment 2

[0046] A method for treating tunnel collapse and roof fall by using an advanced small conduit pre-grouting process. Compared with Example 1, the formula of the double-liquid grouting material in step S2 is different, and the other steps are the same.

[0047] The two-liquid grouting material includes liquid A and liquid B, and the liquid B is water glass; the liquid A includes the following components in parts by weight: 600 parts of cement, 300 parts of fly ash, 100 parts of bentonite, phosphoric acid 20 parts of disodium hydrogen, 10 parts of aluminum oxide, 10 parts of sodium hydroxide, and 1000 parts of water; uniformly mix liquid A and liquid B at a volume ratio of 1:0.5 to obtain the double-liquid grouting material.

[0048] Described water glass Baume degree is 35Be'. The cement is ordinary Portland cement with a strength of 42.5.

[0049] The moisture content of the fly ash is less than 0.2%, and the particle size is 15 μm.

Embodiment 3

[0051] A method for treating tunnel collapse and roof fall by using an advanced small conduit pre-grouting process. Compared with Example 1, the formula of the double-liquid grouting material in step S2 is different, and the other steps are the same.

[0052] The double-liquid grouting material includes liquid A and liquid B, and the liquid B is water glass; the liquid A includes the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, dihydrogen phosphate 20 parts of sodium, 10 parts of alumina, 10 parts of sodium hydroxide, and 1000 parts of water; uniformly mix liquid A and liquid B at a volume ratio of 1:0.5 to obtain the double-liquid grouting material.

[0053] Described water glass Baume degree is 35Be'. The cement is ordinary Portland cement with a strength of 42.5.

[0054] The moisture content of the fly ash is less than 0.2%, and the particle size is 15 μm.

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Abstract

The invention provides a method for treating tunnel collapse roof fall by using an advanced small pipe pre-grouting technology, and relates to the technical field of the tunnel protection. The methodcomprises the following steps: S1, preparing in an early stage; S2, pre-grouting through an advanced small pipe: constructing by using a double-liquid grouting material through adopting the advanced small pipe pre-grouting technology, wherein the double-liquid grouting material comprises liquid A and liquid B, the liquid B is water glass, and the liquid B comprises the following components in parts by weight: cement, coal ash, bentonite, disodium hydrogen phosphate, aluminum oxide, sodium hydroxide, and water; and uniformly mixing the liquid A and the liquid B according to a volume ratio of 1:0.2-1, to obtain the double-liquid grouting material; and S3, monitoring an effect. The method is capable of treating the tunnel collapse roof fall by using the double-liquid grouting material throughadopting the advanced small pipe pre-grouting construction technology, solving a problem that traditional cement-water glass slurry gel is overquick in a certain degree, improving structural stability and durability, and reducing construction cost.

Description

technical field [0001] The invention relates to the technical field of tunnel protection, in particular to a method for treating tunnel collapse and roof fall by adopting an advanced small conduit pre-grouting process. Background technique [0002] With the development of our country's economy, there are more and more expressway construction projects. Landslides and roof fall accidents often occur when expressways in mountainous areas pass through shallow buried sections with thin stratum coverage. In severe cases, large landslides will not only block the openings and affect the progress of the project, but also pose a serious threat to the lives of construction workers. How to effectively deal with the collapse and roof fall of the shallow buried section of the highway tunnel is the focus of attention now. [0003] The grouting material is the main substance that fills and consolidates the fractures and pores in the formation, and it is the key to achieve water blocking o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10C04B28/04
CPCC04B28/04C04B2201/50E21D11/003E21D11/105C04B18/08C04B14/104C04B22/16C04B14/303C04B22/062C04B12/04
Inventor 卢晓强赵德皓文榕宁黄志发李耀光董绍归罗学欢邓文辉邱敏杨奖才
Owner GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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