CN-122013803-A - Space three-dimensional crossed hydraulic tunnel full-hole section composite plugging structure and method

CN122013803ACN 122013803 ACN122013803 ACN 122013803ACN-122013803-A

Abstract

The invention belongs to the technical field of hydraulic tunnel plugging structures in hydraulic and hydroelectric engineering, and particularly discloses a hydraulic tunnel full-hole section composite plugging structure and method for space stereo intersection, which are used for permanently full-hole section plugging of a lower hydraulic tunnel which is spatially intersected with an upper hydraulic tunnel, and sequentially comprise a plugging body structure, a concrete backfilling structure, a mould bag stone slag backfilling structure and a hole retaining wall structure from inside to outside along the axial direction of the lower hydraulic tunnel, wherein the plugging body structure is arranged at the inner end of the lower hydraulic tunnel, the concrete backfilling structure is arranged at the area where the lower hydraulic tunnel is spatially intersected with the upper hydraulic tunnel, the mould bag stone slag backfilling structure is arranged between the plugging body structure and the concrete backfilling structure, and/or between the concrete backfilling structure and the hole of the lower hydraulic tunnel, and the hole retaining wall structure is arranged at the hole of the lower hydraulic tunnel. The invention can realize the blocking of the whole tunnel section of the tunnel.

Inventors

LIAN ZHENHONG
OUYANG LINGXI
LI SHIQIANG
LI ZHE
YU ZHIYOU
LIU CHANGSHENG

Assignees

四川水发勘测设计研究有限公司

Dates

Publication Date: 20260512
Application Date: 20260214

Claims (10)

1. The utility model provides a space stereo cross's hydraulic tunnel full-hole section composite plugging structure for carry out permanent full-hole section shutoff to the lower part hydraulic tunnel with upper portion tunnel space cross, its characterized in that, follow the hole axis direction of lower part hydraulic tunnel includes from inside to outside in proper order: the plugging body structure is arranged at the inner end of the lower hydraulic tunnel; the concrete backfill structure is arranged in a space crossing area of the lower hydraulic tunnel and the upper tunnel; a mould bag stone slag backfilling structure arranged between the plugging body structure and the concrete backfilling structure and/or between the concrete backfilling structure and the hole of the lower hydraulic tunnel, and And the hole retaining wall structure is arranged at the hole of the lower hydraulic tunnel.
2. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure according to claim 1, wherein the plugging body structure is a structure body which is formed by micro-expansion concrete casting and has a shape consistent with the section of a tunnel.
3. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure according to claim 1 or 2, wherein the concrete backfill structure is characterized in that the concrete backfill structure is extended to two sides along the axial direction of the lower hydraulic tunnel with the vertical projection of the crossing point of the upper hydraulic tunnel and the lower hydraulic tunnel as the center, and each side is extended to a length And D is the hole digging diameter or the lining rear inner diameter of the upper tunnel.
4. A space-level crossing hydraulic tunnel full-hole section composite plugging structure according to claim 3 and wherein said concrete backfill structure is full-section backfilled with normal concrete.
5. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure is characterized in that the mould bag stone slag backfill structure is formed by stacking mould bags filled with stone slag in holes, and the mould bags are made of high-strength woven geotextiles.
6. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure according to claim 5, wherein a grouting pipeline is pre-buried at the top of the lower hydraulic tunnel, and a cement layer is formed by filling a gap between the mould bag and the tunnel wall through the grouting pipeline.
7. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure according to claim 6, wherein the grouting pipeline comprises a grouting main path and grouting branches, a plurality of grouting branches are symmetrically arranged in a top area along the axis direction of the tunnel, grout outlets are formed in the grouting branches, and the grouting branches are communicated with the grouting main path.
8. The spatial stereo cross hydraulic tunnel full-hole section composite plugging structure according to claim 1, wherein the hole retaining wall structure is formed by adopting normal concrete casting, and a wall body of the hole retaining wall structure is embedded into a stable rock mass or soil body at the periphery of the hole.
9. The space-stereo-crossing hydraulic tunnel full-hole section composite plugging structure according to claim 1, wherein exhaust grooves with continuous through lengths are symmetrically buried on two sides of a top arch center line of the plugging body structure, exhaust pipes are communicated with the exhaust grooves, and one end of each exhaust pipe is led out to the outer side of the plugging body structure.
10. The space three-dimensional crossed hydraulic tunnel full-hole section composite blocking method is characterized by comprising the following steps of: constructing the inner end of the lower hydraulic tunnel needing permanent plugging to form a plugging body structure, and solidifying and grouting surrounding rock of a plugging body section before pouring the plugging body structure; Constructing a concrete backfill structure in a space crossing area of the lower hydraulic tunnel and the upper tunnel, and performing backfill grouting on a top area of the concrete backfill structure after backfill concrete is poured; Constructing and forming a mould bag stone slag backfilling structure between the plugging body structure and the concrete backfilling structure and/or between the concrete backfilling structure and the hole of the lower hydraulic tunnel, wherein the concrete steps comprise stacking mould bags filled with stone slag in the hole, and grouting and filling gaps between the mould bags and the hole wall through pre-buried grouting pipelines; And constructing and forming an opening retaining wall structure at the opening of the lower hydraulic tunnel.

Description

Space three-dimensional crossed hydraulic tunnel full-hole section composite plugging structure and method Technical Field The invention relates to the technical field of hydraulic tunnel plugging structures in hydraulic and hydroelectric engineering, in particular to a spatial three-dimensional crossed hydraulic tunnel full-hole section composite plugging structure and a method. Background Along with the rapid development of hydraulic and hydroelectric engineering in China, more and more hydraulic and hydroelectric engineering is built in deep mountain canyons, and in combination with the overall arrangement of engineering, in order to meet the requirements of different heights and different functions (such as diversion holes, flood discharge holes, water diversion holes, traffic holes and the like), some underground cavity group systems are often required to be arranged, so that the situation that hydraulic tunnels are mutually intersected in space occurs, the tunnels are basically connected with reservoir areas, the tunnel structure type is required to bear the high water head pressure of water stored in the reservoir in the future, and in order to ensure the safe and reliable operation of engineering, all-tunnel sections of some tunnels are required to be blocked safely, reliably and permanently. In hydraulic tunnel plugging, the common diversion tunnel plugging is to perform partial hole section plugging at the position of a dam curtain line, so that the engineering operation requirement can be met, and the full hole section plugging is not performed any more, so that the engineering investment is saved. For the hydraulic tunnels with space stereo cross, in order to ensure the operation safety of the upper tunnel and the lower tunnel, the lower tunnel needs to be blocked by a full-tunnel section, and two common modes are that firstly, concrete full-tunnel section blocking is adopted, and consolidation grouting, backfill grouting and joint grouting are carried out, so that the investment of the mode is high. Secondly, adopting partial concrete for blocking, utilizing a concrete blocking body and consolidation grouting, backfilling grouting and joint grouting to meet the requirement of high water level water blocking, backfilling the rest of the tunnel sections with stone slag and performing cement grouting to enable the whole tunnel to fill a compact chamber, and finally sealing the tunnel opening by adopting a concrete retaining wall, wherein the stone slag backfilling construction difficulty is high, the backfilling and stacking of the stone slag into a vertical surface are impossible, the top of the tunnel cannot be fully filled, the stone slag is required to be fully backfilled by cement grouting, the compactness is difficult to ensure, the grouting amount is high, and the cement grouting investment is high; meanwhile, the sections which are in space three-dimensional intersection with the upper tunnel are backfilled by stone slag, a certain sedimentation deformation risk exists in long-time operation, and the condition of collapse of the tunnel roof is likely to occur under the action of high external water pressure and the like, so that the normal operation of the upper hydraulic tunnel is affected. Disclosure of Invention The invention provides a space three-dimensional crossed hydraulic tunnel full-hole section composite plugging structure, and aims to realize the full-hole section plugging of a tunnel. The invention is realized by the following technical scheme that the hydraulic tunnel full-hole section composite plugging structure with space stereo cross is used for permanently plugging a lower hydraulic tunnel which is spatially crossed with an upper hydraulic tunnel, and sequentially comprises the following components from inside to outside along the axial direction of the lower hydraulic tunnel: the plugging body structure is arranged at the inner end of the lower hydraulic tunnel; the concrete backfill structure is arranged in a space crossing area of the lower hydraulic tunnel and the upper tunnel; a mould bag stone slag backfilling structure arranged between the plugging body structure and the concrete backfilling structure and/or between the concrete backfilling structure and the hole of the lower hydraulic tunnel, and And the hole retaining wall structure is arranged at the hole of the lower hydraulic tunnel. Further, the plugging body structure is a structure body which is formed by adopting micro-expansion concrete casting and has the same shape as the section of the tunnel. Further, the concrete backfill structure extends to two sides along the axial direction of the lower hydraulic tunnel with the vertical projection of the intersection point of the upper tunnel and the lower hydraulic tunnel as the center, and each side extends to a lengthAnd D is the hole digging diameter or the lining rear inner diameter of the upper tunnel. Further, the concrete backfill structure adopts norma