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Construction method for advance grouting and supporting for tunnel partial collapse

A technology of advanced grouting and construction method, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve problems such as deformation of unilateral primary support and landslide, and achieve the effect of strong adaptability, simple measures, and good control and restraint effect.

Active Publication Date: 2020-02-21
CHINA RAILWAY 18TH BUREAU GRP CO LTD
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Problems solved by technology

[0009] In order to solve the above technical problems, the present invention provides a construction method for advance grouting and support for partial collapse of tunnels, to solve the problem of deformation of primary support on one side and local collapse caused by weak surrounding rock in double-track tunnels of high-speed railways, and to take effective measures Safe and effective treatment of unilateral primary support deformation and collapse

Method used

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  • Construction method for advance grouting and supporting for tunnel partial collapse
  • Construction method for advance grouting and supporting for tunnel partial collapse
  • Construction method for advance grouting and supporting for tunnel partial collapse

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Embodiment 1

[0048] Such as Figure 1-9 As shown, this embodiment provides a construction method for advance grouting and support for partial tunnel collapse, which mainly includes the following steps:

[0049] ⑴ Backfill backpressure in the deformed section.

[0050]① Use ballast to backfill the deformed section under back pressure. When backfilling, fill in layers and control the thickness of the layers not to exceed 1m, and compact them layer by layer with loaders and excavators. The backfill range extends from the end mileage D1K469+405 of the deformation section to D1K469+410 by 5m toward the face 5 to facilitate construction operations. The backfill height is about 3m from the vault. The top of the platform is 15m long, and the gradient of the slope 6 is suitable for on-site mechanical construction.

[0051] ② At D1K469+400 and D1K469+405 with the largest amount of deformation, set up a sleeper pile 7 to support the initial support. Sleepers are 1.2-1.5m long and 20-30cm wide. ...

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Abstract

The invention discloses a construction method for advance grouting and supporting for tunnel partial collapse, and relates to the technical field of tunnel construction. Based on back pressure backfilling, sleeper stacks are used for further supporting the part which have the quickest and largest deformation and is the most unstable in the initial supporting, so that the fact that the entire steelarch wholly collapses from the arch part and causes the currently stable steel frame on the left side of the line to damage together is avoided, and the collapse range and intensity are controlled; the grouting reinforcement is carried out to the deformed section surrounding rock, so that the aims that the deformation is controlled and the safe replacement of the deformed limit invasion steel frame is guaranteed are achieved, and better supporting effect is realized; a butterfly arch is used to better conform to the practical situation of the site surrounding rock, so that the supporting forthe unstable surrounding rock at the single side deformation section is strengthened, and the fact that the supporting intensity meets the site requirements is guaranteed; the advance supporting measures are adopted to improve the front surrounding rock integrity and self stabilization capability, and the construction safety is guaranteed; different from the traditional manner of total-ring arch replacement, the cost is low, the adaptability is high and the generalizability is high.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for performing grouting in advance and supporting partial tunnel collapse. Background technique [0002] On the morning of August 2019, a two-line tunnel of a high-speed railway found through monitoring and measurement that the deformation rate of the initial support on the right side of the D1K469+390~+405 section suddenly accelerated, and the deformation had exceeded the warning value. Immediately start the emergency plan on the site, suspend the construction of the face, evacuate personnel, equipment and materials, and take emergency measures to backfill the deformed section with ballast to prevent the increase of primary support deformation and scope expansion. About 3m. Then, set up sleeper piles at D1K469+400 to D1K469+405 with the largest amount of deformation to support the initial support. [0003] At 17:40 the next day, the connecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D11/18E21D11/15
CPCE21D11/003E21D11/006E21D11/10E21D11/152E21D11/18
Inventor 张馨王小丹邹中林孟超
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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