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Cavern protection method

A technology for karst caves and branch caves, which is used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of high rockfall impact strength, tunnel construction and operation hazards, tunnel cracking, etc., to achieve simple construction and ensure construction and operation safety. , the effect of high reliability

Active Publication Date: 2011-03-16
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

[0002] Tunnel construction in karst areas may encounter various karst types. When the tunnel passes through high, steep and narrow karst caves, rocks may collapse due to factors such as construction disturbance. cause great harm
[0003] At present, when tunnels pass through high, steep and narrow karst caves, backfill protection arches are generally used. A 1m to 2m thick concrete protective layer is applied outside the tunnel lining to resist the impact of rockfall. However, it is impossible to avoid the damage caused by rockfall to construction workers and because the arch protection is in rigid contact with the tunnel structure, the rockfall impact load is transmitted to the tunnel structure in a short time, which can easily cause the tunnel to crack or even be damaged, affecting operational safety

Method used

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Embodiment

[0019] Example: such as figure 1 , 2 As shown, this example involves the protection method for preventing rockfall in tunnels passing through high, steep and narrow karst caves. The specific implementation steps are:

[0020] a. Set up a roundabout branch hole 1 at the side wall of the tunnel 6 and climb to the top of the empty cave 5, and open a vertical branch hole between the roundabout branch holes on both sides of the above-mentioned karst cave directly above the tunnel, and the roundabout branch holes on both sides of the karst cave 1. The elevation of the bottom of the pit is the same. According to the required protection width and the lateral spacing of the longitudinal beams 2, multiple longitudinal branch holes 11 can be opened;

[0021] b. Set the longitudinal beam 2 at the top of the karst cave 5 by using the longitudinal branch hole 11, and the support of the longitudinal beam 2 is located in the longitudinal branch hole 11;

[0022] c. Lay a concrete slab 3 hor...

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Abstract

The invention relates to a cavern protection method for preventing rock fall in lower high steep and narrow cavern sections of a tunnel. The method comprises the following steps of: a, forming roundabout branch holes climbed close to the cavern top elevation of the vertical upper part of the tunnel on tunnel side walls on two sides of a cavern respectively, and developing a plurality of longitudinal branch holes communicating the cavern between the roundabout branch holes on the two sides of the cavern on vertical upper part of the tunnel; b, arranging a longitudinal beam spanning the cavern in each longitudinal branch hole, and supporting two ends of the longitudinal beam in the longitudinal branch holes on two sides of the cavern respectively; c, transversely loading supporting plates serving as bottom supports on a plurality of longitudinal beams; and d, pouring concrete to the top of the cavern on the supporting plates to protect the tunnel on the lower part. The longitudinal beams arranged in the longitudinal branch holes, the supporting plates and the concrete structure are used for actively protecting the top surface of the cavern so as to prevent the unstable rock on the top surface of the cavern from falling and ensure the construction and operation safety.

Description

technical field [0001] The invention relates to a karst cave protection method for preventing rockfall when a tunnel passes through a high, steep and narrow karst cave, and belongs to the field of tunnels and underground engineering. Background technique [0002] Tunnel construction in karst areas may encounter various karst types. When the tunnel passes through high, steep and narrow karst caves, rocks may collapse due to factors such as construction disturbance. cause great harm. [0003] At present, when tunnels pass through high, steep and narrow karst caves, backfill protection arches are generally used. A 1m to 2m thick concrete protective layer is applied outside the tunnel lining to resist the impact of rockfall. However, it is impossible to avoid the damage caused by rockfall to construction workers and because the protective arch is in rigid contact with the tunnel structure, the impact load of falling rocks is transmitted to the tunnel structure in a short time, ...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D9/00
Inventor 苗德海马涛薛斌李鸣冲杨剑殷怀连王伟
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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