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Methods of getting stuck and improving geology in tbm construction tunnel

A technology of segment jamming and geology, which is applied in tunnels, tunnel linings, earth-moving drilling and mining, etc., can solve the problems of easy jamming and jamming, getting out of trouble, and difficulty in construction and excavation of open TBM, so as to achieve low cost input and construction cost. Low, advanced reinforcement for a wide range of effects

Active Publication Date: 2022-03-18
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method suitable for unblocking and strengthening and improving geology in the unfavorable geological section of the open TBM construction tunnel; The problem of getting out of trouble after the machine and the machine are stuck

Method used

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  • Methods of getting stuck and improving geology in tbm construction tunnel
  • Methods of getting stuck and improving geology in tbm construction tunnel
  • Methods of getting stuck and improving geology in tbm construction tunnel

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Embodiment

[0045] (1) Construction site conditions

[0046] On July 30, 2018, when the flat-guided TBM at the exit of the Gaoligongshan Tunnel on the Dali-Sui Railway was excavated to the mileage PDZK224+224, it was revealed that the tunnel face was in the shape of sand as a whole, and water was flowing out of the waist, and the sand-like slag was constantly Influx into the cutter head, resulting in abnormal TBM excavation parameters, increased torque and current, making it difficult to excavate, and there is a risk of machine jamming due to the accumulation of rocks on the top of the cutter head.

[0047] The TSP303 detection report of the geological advance forecast for the construction of Gaoligongshan Tunnel Exit Line II shows that within the detection section PDZK224+234~PDZK224+114, the current excavation reveals that the surrounding rock is the Middle Devonian Huixian Formation (D[2]h) Strata. The lithology is granite, the overall structure is block stone and gravel, weak to stro...

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Abstract

The invention discloses a method for getting rid of stuck machines and reinforcing and improving geological conditions in bad geological sections of TBM construction tunnels, aiming to solve the technical problems in the prior art that poor geological conditions cause difficult excavation and easy stuck machines in open TBM construction. The invention carries out small guide tunnel construction from above the TBM shield, performs long-distance horizontal reinforcement on the unfavorable geology in front of the tunnel face, and cleans up slag accumulation around the cutter head and shield body. The method of the present invention can effectively reduce the risk of getting stuck and get out of trouble, and can realize the horizontal advance reinforcement of the surrounding rock in front of the TBM. At the same time, the shield is released using the construction space of the pipe shed, so that the TBM gets out of trouble after the machine gets stuck; the treatment period is short, and the cost input is low. Construction safety; and broaden the application prospect of TBM construction method, make TBM still can continue to construct after adopting the related method of the present invention under the unfavorable geological tunnel environment, have promoted the further development of tunnel cause, have obtained good social benefit; The construction techniques and methods are all conventional methods, and the machines, tools and materials are used rationally, which saves resource input; at the same time, the poor geological pre-reinforcement using the small pilot tunnel method has less construction waste materials, and the environmental and energy-saving benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of TBM construction, in particular to a method for unblocking and reinforcing and improving geology of a TBM construction tunnel in an unfavorable geological section. Background technique [0002] At present, in the process of tunnel construction, TBM is widely used for excavation. However, due to geological influences, when excavation construction passes through unfavorable geological sections, the surrounding rock is often extremely broken, especially the open TBM construction is highly sensitive to unfavorable geology. Difficult, in severe cases, it will cause TBM jamming (shield locked or cutterhead jammed). Due to the influence of the shield body and cutter head equipment, it is impossible to effectively clean the slag around the cutter head and pre-reinforce it in advance. After encountering a jammed machine, the drilling and blasting method was used to get out of trouble. The construction volume was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/087E21D9/12E21D11/10E21D11/15E21D11/18
CPCE21D9/087E21D11/10E21D11/152E21D11/18E21D9/12
Inventor 胡新朋王亚锋马亮朱建民曹耀祖刘强陈阳吴文娟
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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