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CN-224214183-U - Rock burst tunnel supporting structure suitable for TBM construction method

CN224214183UCN 224214183 UCN224214183 UCN 224214183UCN-224214183-U

Abstract

The utility model provides a rock burst tunnel supporting construction suitable for TBM construction method, belongs to tunnel boring machine construction technical field, including the prestressing force stock in the embedding tunnel country rock, and set gradually in just spout fibre concrete layer, reinforcing bar net, steelframe and the fibre concrete layer that spouts again of tunnel wall, be equipped with first hunch portion buffer layer between just spouting concrete layer and the reinforcing bar net, the fibre concrete layer upper surface that spouts again is equipped with second hunch portion buffer layer, reinforcing bar and mould concrete layer in proper order. According to the utility model, the first arch buffer layer and the second arch buffer layer can respectively absorb the rock burst impact energy, and the buffer energy consumption threshold value when the strong rock burst impact is handled is increased, so that the safety of the tunnel supporting structure is increased.

Inventors

  • Qing Chaohui
  • XIA YING
  • LUO NING
  • WANG GUANGXIU
  • ZHANG CHENGYONG
  • ZHANG FENGWEI
  • JIANG YAOYUE
  • DENG HONGMEI
  • JI JINGJING

Assignees

  • 中国水利水电第七工程局有限公司

Dates

Publication Date
20260508
Application Date
20250521

Claims (8)

  1. 1. The rock burst tunnel supporting structure suitable for the TBM construction method comprises a prestressed anchor rod (1) embedded into surrounding rock of a tunnel, and a primary spraying fiber concrete layer (2), a reinforcing mesh and a steel frame (4) and a secondary spraying fiber concrete layer (5) which are sequentially arranged on the wall surface of the tunnel, and is characterized in that a first arch buffer layer (3) is arranged between the primary spraying fiber concrete layer (2) and the reinforcing mesh and the steel frame (4), and a second arch buffer layer (6), a reinforcing bar (7) and a molded concrete layer (8) are sequentially arranged on the upper surface of the secondary spraying fiber concrete layer (5).
  2. 2. The rock burst tunnel supporting structure suitable for the TBM construction method according to claim 1 is characterized in that the length of the prestressed anchor rod (1) is 480-520 cm.
  3. 3. The rock burst tunnel supporting structure suitable for the TBM construction method according to claim 1, wherein the thicknesses of the first arch buffer layer (3) and the second arch buffer layer (6) are 6-10 mm.
  4. 4. A rock burst tunnel support structure suitable for a TBM construction method according to claim 3, wherein the thickness of the first arch buffer layer (3) and the second arch buffer layer (6) is 8mm.
  5. 5. The rock burst tunnel support structure suitable for the TBM construction method according to claim 1, wherein polyethylene foam plastic is filled in the first arch buffer layer (3) and the second arch buffer layer (6).
  6. 6. The rock burst tunnel supporting structure suitable for the TBM construction method according to claim 1, wherein the thickness of the primary spraying fiber concrete layer (2) is 40-80 mm.
  7. 7. The rock burst tunnel supporting structure suitable for the TBM construction method according to claim 1, wherein the thickness of the composite spraying fiber concrete layer (5) is 120-150 mm.
  8. 8. The rock burst tunnel support structure suitable for the TBM construction method according to claim 1, wherein the thickness of the molded concrete layer (8) is greater than 200mm.

Description

Rock burst tunnel supporting structure suitable for TBM construction method Technical Field The utility model belongs to the technical field of Tunnel Boring Machine (TBM) construction, relates to a rock burst tunnel supporting structure, and particularly relates to a rock burst tunnel supporting structure suitable for a TBM construction method. Background The TBM (Tunnel Boring Machine, full-face tunnel boring machine) is industrial assembly line type tunnel construction equipment integrating construction procedures such as tunneling, supporting and slag discharging, is particularly suitable for deep-buried long tunnel construction under complex geographic features, has the advantages of high tunneling speed, environment friendliness, high efficiency, high safety performance and the like, is widely applied to tunnel engineering such as railways, hydropower, traffic, mines and municipal works, and is one of key technologies in the field of tunnel construction. In strong-extremely strong rock burst stratum, TBM construction faces the problems of instability of surrounding rock, damage of supporting structures and the like, and construction progress and safety are seriously affected. The existing supporting structure has the problems of insufficient supporting strength, poor adaptability and the like when dealing with rock burst, and a novel method is needed to solve the problems. Therefore, in order to solve the problem, the utility model provides a rock burst tunnel supporting structure suitable for a TBM construction method. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present utility model is directed to providing a supporting structure of a rock burst tunnel suitable for a TBM construction method, so as to solve the technical problems of insufficient supporting strength and poor adaptability of the supporting structure of the rock burst tunnel in the prior art when coping with rock burst, thereby affecting the construction safety of the rock burst tunnel. In order to achieve the above and other related objects, the utility model provides a rock burst tunnel supporting structure suitable for a TBM construction method, which comprises a prestressed anchor rod embedded in surrounding rock of a tunnel, and a primary spraying fiber concrete layer, a reinforcing steel bar net, a steel frame and a secondary spraying fiber concrete layer which are sequentially arranged on the wall surface of the tunnel, wherein a first arch buffer layer is arranged between the primary spraying fiber concrete layer and the reinforcing steel bar net, and a secondary spraying fiber concrete layer, and a second arch buffer layer, reinforcing steel bars and a molded concrete layer are sequentially arranged on the upper surface of the secondary spraying fiber concrete layer. In any of the above schemes, preferably, the length of the prestressed anchor rod is 480-520 cm. In any of the above schemes, preferably, the thicknesses of the first arch buffer layer and the second arch buffer layer are both 6-10 mm. In any of the above embodiments, it is preferable that the thickness of each of the first arch buffer layer and the second arch buffer layer is 8mm. In any of the above embodiments, it is preferable that the first arch buffer layer and the second arch buffer layer are each filled with polyethylene foam. In any of the above schemes, preferably, the thickness of the primary spraying fiber concrete layer is 40-80 mm. In any of the above schemes, preferably, the thickness of the composite spray fiber concrete layer is 120-150 mm. In any of the above aspects, it is preferable that the thickness of the molded concrete layer is greater than 200mm. As described above, the rock burst tunnel supporting structure suitable for the TBM construction method has the following beneficial effects that in the utility model, the arrangement of the first arch buffer layer and the second arch buffer layer can respectively absorb rock burst impact energy, and the buffer energy consumption threshold value when the strong rock burst impact is handled is increased, so that the safety of the tunnel supporting structure is increased. Drawings Fig. 1 shows a schematic structure of the present utility model. Description of element reference numerals 1-Prestressed anchor rod, 2-primary spraying fiber concrete layer, 3-first arch buffer layer, 4-reinforcing steel mesh and steel frame, 5-secondary spraying fiber concrete layer, 6-second arch buffer layer, 7-reinforcing steel and 8-molded concrete layer. Detailed Description Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples. Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting th