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Micro-disturbance mechanical separate tunneling construction method for tunnel in weak surrounding rock

A technology of weak surrounding rock and micro-disturbance, applied in the direction of tunnels, tunnel linings, shaft linings, etc., can solve problems such as insufficient support strength, cracking, collapse and roof fall, secondary linings, etc., to reduce disaster losses, prevent deformation, and control large-scale The effect of disturbance

Inactive Publication Date: 2019-04-09
CHANGAN UNIV
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Problems solved by technology

[0004] Therefore, it is necessary to propose a new mechanical construction technology suitable for weak surrounding rock tunnels, especially when building long-span tunnels in weak strata, to solve the problem of collapse or roof collapse in weak surrounding rock tunnels due to insufficient support strength or untimely support. Severe cracking of the secondary lining

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  • Micro-disturbance mechanical separate tunneling construction method for tunnel in weak surrounding rock
  • Micro-disturbance mechanical separate tunneling construction method for tunnel in weak surrounding rock
  • Micro-disturbance mechanical separate tunneling construction method for tunnel in weak surrounding rock

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.

[0036] Such as Figure 4 and 5 As shown, in a micro-disturbance segmental mechanical excavation method for weak surrounding rock tunnels, the complete cycle steps of a jacking process are as follows:

[0037] Step 1. Shield division jacking

[0038] Divide the shield 2 of the annular closed structure into multiple sub-shields from top to bottom. For the convenience of advanced jacking, the level difference between the top and bottom of the shield is 1 / 2 of the shield height;

[0039] High-strength drill pipes are used to eliminate the boulder obstacle in front of the shield, and the shield 2 is pushed into the surrounding rock 1 through a hydraulic jack. The jacking footage of the shield 2 is 1.2m. The upper sub-shield is inserted into the surrounding rock 1, and then the other sub-sh...

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Abstract

The invention discloses a micro-disturbance mechanical separate tunneling construction method for a tunnel in weak surrounding rock. The method comprises the following steps: firstly, a shield is divided into multiple sub-shields from top to bottom, the multiple sub-shields are jacked gradually from bottom to top, and disturbance to the surrounding rock is reduced; then step separate excavation isperformed on a tunnel face, excavation disturbance is reduced as compared with overall excavation, surrounding rock deformation is controlled, tunnel deformation is prevented, and construction safetyis improved; secondly, the excavated tunnel is subjected to primary support with prefabricated members, and rapid sealing and primary support reinforcement are realized; finally, secondary lining isperformed on the primary support, and waterproof plates are arranged between the secondary lining and the primary support. The construction method is safe, efficient and economical, effectively controls large disturbance and large deformation of surrounding rock during excavation and reduces disaster losses of engineering construction.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to a micro-disturbance mechanical divisional excavation method suitable for tunnel construction in weak surrounding rock. Background technique [0002] The main engineering problems faced in the construction process of tunnels with weak surrounding rocks are construction period and self-stability. Tunnels with weak surrounding rocks, due to poor stability of surrounding rocks, difficult to control deformation and prone to safety accidents such as landslides, lead to complex construction procedures and extremely slow construction speeds, which seriously affect and restrict the construction period of the project; in addition, the deformation speed and deformation time Length is the basic characteristic of weak surrounding rock, which means that the slower the construction speed, the longer the surrounding rock exposure time, the greater the deformation of the tunnel, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D11/00E21D11/10E21D11/38
CPCE21D9/06E21D9/0607E21D11/10E21D11/107E21D11/38
Inventor 谢永利邱军领赖金星魏瑞王修领来弘鹏秦祎文马恩临徐硕硕张龙
Owner CHANGAN UNIV
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