Construction technology of a large-section soft rock large-deformation tunnel
A construction technology and large deformation technology, applied in tunnels, tunnel linings, shaft equipment, etc., can solve the problems of intrusion limit, fast deformation rate, and ineffective release of in-situ stress, so as to prevent intrusion limit, improve bearing capacity, The effect of reducing stress
Active Publication Date: 2019-01-29
CHANGAN UNIV
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Problems solved by technology
[0002] In order to meet the development needs of national highways and high-speed railways, the excavation section of traffic tunnels is getting larger and larger, and it is inevitable to pass through complex strata such as soft rocks, which brings great challenges to tunnel construction
Due to the large amount of deformation of the surrounding rock after the excavation of the soft rock tunnel, the deformation rate is fast, and the duration is long. The protection structure is easily cracked, damaged, and invaded due to excessive force, resulting in frequent excavation and arch replacement, which not only makes it difficult to guarantee the quality of tunnel construction, but also leads to uncontrollable cost, unpredictable construction period, and unguaranteed construction safety. In addition, the section of the tunnel being built is getting larger and larger, and the above problems are even more difficult to solve
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] The construction technology of a large-section soft rock large-deformation tunnel provided by this embodiment includes the following steps:
[0030] 1) Construction of the upper steps: firstly carry out the arc-shaped pilot pit part I of the upper steps (see figure 1 ) and reserve the upper step core soil part IV (1), the core soil length is 3-5m, after excavating a foot, quickly lay the elastic foam board of the arch and fix it with long anchors, erect the arch immediately after completion Outer steel frame 2, the model is HW200*200 steel, and 2 rows are laid at 30-50cm above the arch feet...
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The invention relates to the field of tunnel engineering, in particular to a construction technique for a large-section soft rock large-deformation tunnel. The construction technology that the present invention adopts is 1) upper step construction; 2) middle step construction; 3) lower step construction; 4) reserved core soil excavation; After partial excavation, carry out initial spraying immediately; 6) Set up the inner steel frame in time, using HW200*200 steel, and after closing it into a ring, spray the inner layer of shotcrete to the design thickness; 7) The inner surface of the inner layer of shotcrete, lay Waterproof board; 8) When the deformation of the tunnel reaches the design reserved deformation, the secondary lining is applied; 9) Under the support of the advance grouting small conduit, the construction of the next cycle is carried out until the tunnel is penetrated. It not only satisfies the large deformation requirements of soft rock, and achieves non-invasiveness, but also reduces the stress on the support structure and ensures the safety of the support structure.
Description
1. Technical field: [0001] The invention relates to the field of tunnel engineering, in particular to a construction technique for a large-section soft rock large-deformation tunnel. 2. Background technology: [0002] In order to meet the development needs of national highways and high-speed railways, the excavation section of traffic tunnels is getting larger and larger, and it is inevitable to pass through complex strata such as soft rocks, which brings great challenges to tunnel construction. Due to the large amount of deformation of the surrounding rock after the excavation of the soft rock tunnel, the deformation rate is fast, and the duration is long. The protection structure is easily cracked, damaged, and invaded due to excessive force, resulting in frequent excavation and arch replacement, which not only makes it difficult to guarantee the quality of tunnel construction, but also leads to uncontrollable cost, unpredictable construction period, and unguaranteed const...
Claims
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IPC IPC(8): E21D9/00E21D11/00E21D11/18E21D11/10E21D11/08E21D20/00E21D20/02E21D11/38
CPCE21D9/00E21D9/001E21D11/00E21D11/08E21D11/10E21D11/18E21D11/183E21D11/38E21D20/00E21D20/02
Inventor 陈建勋罗彦斌陈丽俊刘钦黄沛
Owner CHANGAN UNIV