Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method

A technology of bearing structures and consolidation rings, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficulty in adapting

Active Publication Date: 2011-03-16
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the burial depth increases and encounters the action of groundwater with a water head exceeding thousands of meters, the current type of reinforced concrete lining as the main load-bearing structure is difficult to adapt

Method used

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  • Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method
  • Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method
  • Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, as figure 1 , figure 2 As shown, this example is a circular tunnel 1 and a second-layer surrounding rock consolidation grouting circle, and the grouting of each consolidation grouting borehole is divided into two sections. The consolidation grouting circle of surrounding rock 3 in the outer layer of the tunnel is relatively dense, has a small permeability coefficient, and correspondingly bears a large external water seepage pressure, while the consolidation grouting circle of inner surrounding rock 2 is relatively sparse, has a large permeability coefficient, and correspondingly bears a small external water seepage pressure . The grouting holes of the inner layer grouting ring are radially spaced one or two holes away from the consolidation grouting, and directly use high-grade cement mortar to seal the holes 6 . The density of the consolidation grouting hole in this example is about 1.0×1.0m, the grouting pressure used for the consolidation grouting of...

Embodiment 2

[0030] Embodiment 2, as figure 1 , figure 2 As shown, this example is also the circular tunnel 1 and the second layer of consolidation grouting circle. Its basic structure is the same as the previous example, the difference is that the density of the consolidation grouting holes in this example is about 2.0×2.0m, the grouting pressure used for the consolidation grouting of the outer surrounding rock 3 is about 2 times the external water pressure, and the type of grout is Finely ground cement, the particle specific surface area of ​​the cement slurry is 10000cm 2 / g; the grouting pressure used for the consolidation grouting of the inner surrounding rock is about 1.5 times the external water pressure, the type of grout is ordinary cement, and the particle specific surface area of ​​the cement grout is 4500cm 2 / g.

[0031] The construction method of the present embodiment comprises the following steps:

[0032] 1) First, according to the engineering requirements of the tunn...

Embodiment 3

[0034] Embodiment 3, as image 3 As shown in the figure, this example is a circular tunnel 1 and a three-layer surrounding rock consolidation grouting circle. The basic structure is the same as the above example, the difference is that the surrounding rock consolidation grouting circle in this example is three-layered, and the grouting section process of each consolidation grouting hole is increased to three stages, and the density of the consolidation grouting hole is about 1.5×1.5m, the grouting pressure used for the consolidation grouting of the outer surrounding rock 3 is about 1.8 times the external water pressure, and the type of grout is epoxy resin, a chemical grouting material; the grouting pressure used for the consolidation grouting of the intermediate surrounding rock 4 is about 1.5 times the external water pressure, the type of slurry is ground cement, and its particle specific surface area is about 7000cm 2 / g; the grouting pressure used for the consolidation gr...

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Abstract

The invention relates to a multilayer wall rock grouting stereosphere tunnel bearing structure and constructing method. It has tunnel and the feature is that two layers or over two layers different consolidation holes density, different grouting pressure, different serum species, and different particle of serum would be coated on the wall rock. The invention could be used in water conservancy water and electricity tunneling under the action of super-high pressure cranny groundwater, and could be also used in traffic tunneling and city water supplying tunneling.

Description

technical field [0001] The invention relates to a multi-layer surrounding rock grouting consolidation circle tunnel bearing structure and a construction method thereof. It is mainly suitable for water conservancy and hydropower tunnel projects under the action of ultra-high pressure cracked groundwater, and is also suitable for various traffic tunnel projects and urban water supply tunnel projects. Background technique [0002] The tunnels involved in the construction of water conservancy, hydropower, transportation and other projects are getting deeper and deeper, and the groundwater pressure encountered is often hundreds of meters or even thousands of meters of water head. Due to the large range of groundwater recharge and long attenuation period, if the treatment is not good, the discharge of groundwater will have adverse effects on the surrounding hydrogeological environment on the one hand, and on the other hand, it will bring great difficulties and hazards to project c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14E21D11/10
Inventor 张春生侯靖
Owner POWERCHINA HUADONG ENG COPORATION LTD
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