Strengthening method for preliminary tunnel support
An initial support and tunnel technology, applied in the direction of tunnel, tunnel lining, earthwork drilling, etc., can solve the problems of strong operability, tunnel collapse, large tunnel excavation section, etc., to achieve strong operability and ensure safety. , The effect of saving engineering investment
Active Publication Date: 2016-08-17
POWERCHINA CHENGDU ENG
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Problems solved by technology
For weak and broken surrounding rock areas, deformation and cracking of the primary support of the tunnel often occur before the secondary lining of the tunnel. The main reasons for the deformation of the primary support of the tunnel may be: 1. The excavation section of the tunnel is too large, and the excavation makes the surrounding rock loose 2. The problem of voiding behind the initial support, the initial support did not fully play its role, the surrounding rock in the void area was loose, and affected the relaxation and deformation of the surrounding surrounding rock; 3. The initial support could not meet the actual needs; 4. Deformation of the tunnel due to the combination of the above and other factors
Regardless of the reason for the initial support deformation, there is a common characteristic after the initial support deformation: the surrounding rock behind the initial support is broken, and the relaxation circle is large, and the loose pressure is large. If the initial support deformation of the tunnel is not Timely treatment, or inappropriate treatment methods can easily induce tunnel collapse and safety accidents
In the current prior art, there is no safe, fast, operable, and engineering investment-saving reinforcement method for the primary support of tunnels
Method used
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[0022] The present invention will be further described below in conjunction with accompanying drawing.
[0023] like figure 1 , figure 2 Shown, the reinforcement method of tunnel primary support of the present invention comprises the following steps:
[0024] a. Use the slag 1 to quickly perform back pressure treatment on both sides of the bottom of the initial support 2;
[0025] b. Set up a support device 4 on the inner side of the initial support 2 for temporary support processing;
[0026] c. Carry out radial reinforcement treatment to the surrounding rock within the scope of the arch wall of the tunnel 3 in the primary support 2 deformation section;
[0027] d. Carry out secondary concrete lining construction for primary support 2.
[0028] In step a, use slag 1 to quickly perform backpressure treatment on both sides of the bottom of primary support 2. In the initial stage of tunnel construction, slag 2 is used as waste, and slag 1 is used to perform backpressure on ...
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Abstract
The invention discloses a strengthening method for a preliminary tunnel support, in particular to a strengthening method applied to the preliminary tunnel support in a weak cracked rock surrounding section. The strengthening method for the preliminary tunnel support comprises the following steps that a, the two sides of the bottom of the preliminary support are subjected to back pressure treatment quickly by using tunnel slag; b, a supporting device is arranged on the inner side of the preliminary support and used for temporary supporting; c, surrounding rocks within the range of a tunnel arch wall in a deformation section of the preliminary support are subjected to radial strengthening treatment; and d, secondary concrete lining construction is carried out on the preliminary support. By means of the strengthening method for the preliminary tunnel support, safety and quickness are achieved, operability is high, and project investment is reduced.
Description
technical field [0001] The invention relates to a reinforcement method for primary support of tunnels, in particular to a reinforcement method for primary support of tunnels applied to weak and broken surrounding rock sections. Background technique [0002] During the construction of railway and highway traffic tunnels, after the excavation of the tunnel, in order to control the appropriate release and deformation of the surrounding rock stress, increase the structural safety and facilitate the construction, immediately after the excavation of the tunnel, the rigidity is small and it is used as a part of the permanent bearing structure. The structural layer is called the primary support, and the primary support in the tunnel engineering generally adopts the anchor shotcrete structure. For weak and broken surrounding rock areas, deformation and cracking of the primary support of the tunnel often occur before the secondary lining of the tunnel. The main reasons for the deforma...
Claims
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Login to View More IPC IPC(8): E21D11/10E21D21/00
CPCE21D11/107E21D21/00
Inventor 吴学智傅支黔聂大丰青华彬陈炜韬
Owner POWERCHINA CHENGDU ENG