Treatment method for fault fracture zone collapse in tunnel construction process

A technology of tunnel construction and broken zone, which is applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc. It can solve the problems of surrounding rock settlement and deformation, failure of installation of pipe shed, and difficulty in drilling, so as to reduce investment, ensure safety and Permanent, avoids the effect of drilling work

Inactive Publication Date: 2014-12-10
SHANDONG UNIV
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Problems solved by technology

After the small conduit is grouted to consolidate the landslide body, during the construction of the pipe shed advance support, drilling diff

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  • Treatment method for fault fracture zone collapse in tunnel construction process
  • Treatment method for fault fracture zone collapse in tunnel construction process
  • Treatment method for fault fracture zone collapse in tunnel construction process

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Embodiment Construction

[0032] Attached below Figure 1-4 , taking the collapse treatment of the sudden fault fracture zone of a tunnel as an example, the method and construction steps of the collapse treatment of the fault fracture zone during the tunnel construction process are explained in detail.

[0033] Construction preparation stage:

[0034] According to the design and processing of 5 tunnel support formworks, the formwork size is 5.5m in inner radius, 0.9cm in thickness, 1.5m in hole-to-hole spacing, 2.5cm in hole radius, and 1.8m in formwork length. Weld 5 formwork support platforms, the steel formwork support height is 8.5m, and the width is 11m. Workers will be trained in advance on construction methods and safe operation drills will be conducted. Prepare the required steel skeleton, jacks, grouting materials, concrete and ensure the performance of the required mechanical equipment in good condition.

[0035] Phases of the construction process:

[0036] ①Firstly, the surrounding rocks...

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Abstract

The invention discloses a treatment method for fault fracture zone collapse in the tunnel construction process. The method includes the steps that firstly, arch reinforcement is conducted on every two adjacent surrounding rocks in a collapse segment; secondly, a collapse body is removed, and concrete is jetted to the collapse tunnel face after the collapse body is removed to close the collapse segment; thirdly, a lifting jack acts on the four corners of each bottom of racks of formworks, the interval identical to the width of a steel arch is reserved between the formworks, formwork erection is conducted in time, and the formworks and the steel arch jointly form a supporting layer; fourthly, through holes reserved in the formworks in advance, an arch apex concrete layer is formed in a high-pressure grouting mode, and small grouting guide pipes are punched into arch springs and the side walls of the steel arch; fifthly, the front end of a bottom die composed of the formworks and the steel arch is grouted and reinforced through the small guide pipes, operation of the next construction circulation stage of the collapse segment is conducted, and the first step, the second step, the third step and the fourth step are specifically repeated; sixthly, after second circulation is finished, supports of arch protecting layer concrete are formed through conveying ports embedded through the second step.

Description

technical field [0001] The invention relates to a method for treating the collapse of a fractured fault zone during tunnel construction. Background technique [0002] Landslide disasters frequently occur during tunnel construction. When the tunnel construction reaches the fault fracture zone, due to the sudden drop in the surrounding rock grade and the fact that the fault fracture zone is often rich in groundwater, the original initial support design is difficult to maintain the stability of the surrounding rock, and a large-scale landslide occurs. Tunnel landslides will cause delays in the construction period, damage to machinery and equipment, increase in investment costs, and pose a huge threat to the safety of construction personnel on site. [0003] At present, the main technical means to control landslides are the advanced small conduit method and the advanced support method of pipe shed. Because the landslides in the fault fracture zone have the characteristics of l...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10
Inventor 李术才袁永才周宗青李利平张乾青石少帅雷霆王升
Owner SHANDONG UNIV
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