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

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

Active Publication Date: 2007-03-28
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

[0021] Example 1. As shown in Figure 1 and Figure 2, this example is a circular tunnel 1 and a two-layer surrounding rock consolidation grouting circle, and the grouting section of each consolidated grouting borehole is divided into two sections. The consolidation grouting circle of the outer surrounding rock 3 of the tunnel is relatively dense, the permeability coefficient is small, and the corresponding external water seepage pressure is relatively large. The consolidation grouting circle of the inner surrounding rock 2 is relatively sparse, the permeability coefficient is large, and the corresponding external water seepage pressure is small. . In the inner grouting circle, one or two holes in the grouting aperture can no longer be consolidated and grouted, and high-grade cement mortar can be directly used to seal the holes 6. The density of the consolidation grouting holes in this example is about 1.0×1.0m, the grouting pressure used for the consolidation grouting of the outer ...

Embodiment 2

[0035] Embodiment 2. As shown in Fig. 1 and Fig. 2, this example is also a circular tunnel 1 and a two-layer consolidated grouting ring. The basic structure is the same as the previous example, but the difference is that the density of the consolidation grouting hole 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 adopted Ground cement, the particle specific surface area of ​​cement slurry is 10000cm 2 / g; The grouting pressure used for the consolidation grouting of the inner surrounding rock 2 is about 1.5 times the external water pressure, the type of grout is ordinary cement, and the specific surface area of ​​the cement grout is 4500cm 2 / g.

[0036] The construction method of this embodiment includes the following steps:

[0037] 1) First, according to the engineering requirements of the tunnel, design the consolidation grouting h...

Embodiment 3

[0039] Example 3. As shown in Figure 3, this example is a circular tunnel 1, a three-layered surrounding rock consolidation grouting circle. The basic structure is the same as the previous example. The difference is that the surrounding rock consolidation grouting circle in this example is three layers. The grouting segmentation process of each consolidation grouting borehole is increased to three. 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 adopts the chemical grouting material epoxy resin; the grouting pressure used for the consolidation grouting of the middle surrounding rock 4 is about 1.5 Times the external water pressure, the type of slurry is ground cement, and the specific surface area of ​​its particles is about 7000cm 2 / g; The grouting pressure used for the consolidation grouting of the inne...

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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 ring 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 fractured groundwater, but also for all kinds of 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 replenishment and the long attenuation period, if it is not handled properly, groundwater discharge will have an adverse effect on the surrounding hydrogeological environment, and on the other hand, it will bring great difficulties and hazards to the construction and operation o...

Claims

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Application Information

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