CN-122014287-A - Integrated synergistic rapid treatment method for collapse of water-rich weak broken tunnel

CN122014287ACN 122014287 ACN122014287 ACN 122014287ACN-122014287-A

Abstract

The invention discloses an integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel, which follows the core principles of surrounding rock modification, active support, step control and dynamic closure, and constructs an integrated treatment system with closely connected working procedures and collaborative spatial effect by four key links of step-by-step consolidation grouting, advanced support, steel arch replacement and timely following concrete lining construction, thereby realizing comprehensive control and rapid construction recovery for collapse disasters. By optimizing the construction flow and key technical parameters, the method effectively solves the problems of the traditional method such as process cutting, poor consolidation effect, passive support, long treatment period and the like under the condition of water-rich weak surrounding rock breaking, and remarkably improves the controllability and the operation safety of collapse section construction. Meanwhile, a reproducible and generalized technical system and engineering reference are provided for collapse prevention and emergency treatment of underground engineering under similar geological conditions, and the method has important theoretical value and wide engineering application prospect.

Inventors

DU SHAOHUA
ZHANG FENGSHOU
LI CHUANG
SHAN LEI
ZHAO WENKAI
LI BANG
Niu Jikuan

Assignees

河南科技大学
同济大学
中国水利水电第十一工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (10)

1. The integrated synergistic rapid treatment method for collapse of the water-rich weak broken tunnel is characterized by comprising the following steps of: s1, sealing the collapse area, namely spraying concrete with a certain thickness to the collapse area at the top for sealing; S2, carrying out consolidation grouting treatment on the top collapse area; s3, filling a cavity formed by collapse by adopting concrete; S4, supporting the advance pipe shed and carrying out advanced consolidation grouting; S5, cleaning a slag pile body and solidifying and grouting the side wall; s6, replacing the steel arch; s7, immediately performing tunnel lining concrete construction after the replacement of the steel arch is completed; S8, monitoring and feeding back surrounding rock of the tunnel collapse repair section.
2. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 1, wherein in the step S1, after collapse stabilization of the tunnel face occurs, a construction platform with a certain height is formed by backfilling stone slag, and concrete is sprayed to a top collapse area for sealing based on the construction platform.
3. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 1, wherein in the step S2, the top area of the tunnel face is subjected to consolidation grouting treatment, and then the vertically corresponding surface collapse area is subjected to consolidation grouting treatment.
4. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 3, wherein in the step S3, after the strength of the consolidated grouting reaches a design specified value, a supporting material is used for sealing a cavity area formed by collapse along the shape of the outer contour of the tunnel, so that the cavity area formed by collapse forms a tunnel design contour, and concrete is used for filling the cavity formed by collapse in time.
5. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 1, wherein in step S4, after the collapse treatment of the tunnel top is completed, the pile slag is partially cleaned, concrete is sprayed in time after the tunnel face is exposed, and then advanced greenhouse and advanced consolidation grouting treatment is performed according to design requirements.
6. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 3, wherein in the step S5, collapse bodies, slag stacking bodies and nearby muddy water in the collapse area are cleaned together, a supporting trolley is used for concreting and grouting the collapse deformation area of the side wall of the tunnel, grouting materials adopted in the step S5 are the same as grouting materials adopted in the step S2, and quick setting high-strength concreting grouting materials are adopted.
7. The integrated collaborative rapid treatment method for collapse of a water-rich and weak broken tunnel according to claim 1, wherein in the step S6, after the steel arch is dismantled, a hydraulic hammer or a pneumatic pick is used for carrying out underexcavation treatment, the original anchor rod is kept, the original steel structure is cut off until the profile form of the tunnel meets the construction and design requirements, primary spraying is carried out in time after finishing the surrounding rock surface, a reinforcing mesh is hung by the original anchor rod, after net mounting is finished, the processed corresponding steel arch units are conveyed to a working surface, after adjustment and positioning mounting are carried out, and concrete pads are additionally arranged at the gaps between the steel arch and the primary spraying concrete to wedge the steel arch.
8. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 1, wherein in step S7, the method is performed according to the following procedures: S71, before lining concrete, cleaning a bottom plate to a bedrock surface, and binding steel bars and burying embedded parts according to a design drawing after acceptance inspection; s72, after the reinforcement is bound and accepted, performing bottom plate concrete pouring and maintenance, and setting a water stopping structure according to requirements; S73, carrying out reinforcement binding on the side wall and the top arch by using a reinforcement binding trolley; S74, arranging a lining steel mould trolley once the steel bars are installed and accepted, installing a steel mould which needs to be used in the pouring process, connecting a concrete pump, and performing pouring operation of tunnel lining concrete; and S75, after the strength reaches the design requirement, removing the mould, and curing the poured concrete structure.
9. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to claim 5, wherein in step S4, measurement lofting is performed first during construction of an advanced tunnel, and positions of the tunnel are marked on the tunnel face.
10. The integrated collaborative rapid treatment method for collapse of a water-rich weak broken tunnel according to any one of claims 1-9, wherein in step S8, monitoring devices are disposed on the surface of the surrounding rock to monitor deformation of the surrounding rock in real time.

Description

Integrated synergistic rapid treatment method for collapse of water-rich weak broken tunnel Technical Field The invention relates to the technical field of disaster prevention, control and repair of tunnel engineering, in particular to a tunnel collapse integrated cooperative rapid treatment method for a water-rich weak broken stratum, which is suitable for collapse rescue and recovery construction of extremely bad geological sections in underground engineering such as water conservancy and hydropower. Background The construction of the tunnel of the underground hydraulic and hydroelectric engineering often needs to pass through complex and changeable geological environments. Wherein, the water-rich weak fracture stratum (such as fracture zone, weathering cyst groove, strong alteration zone, etc.) is one of the most troublesome bad geological conditions in construction. The stratum generally has the characteristics of loose structure, poor cementing property, short self-stabilization time effect and easy softening and disintegration when meeting water. After the tunnel is excavated and unloaded, the existence of the underground water not only reduces the rock mass strength and friction coefficient, but also generates remarkable osmotic pressure, and a vicious circle of excavation disturbance-underground water erosion-strength degradation is formed, so that the instability of the tunnel face, the large deformation of surrounding rock, the mud and sand gushing and even the sudden large-scale collapse behind the tunnel face are extremely easy to be induced. Such disasters not only seriously threaten personnel and equipment safety, but also often cause serious delay of construction period and bring about huge economic loss. In order to cope with the disasters, the traditional treatment method generally follows the passive treatment thought of 'arranging, blocking, fixing and supporting', and adopts staged and localized technical measures. The common method comprises the steps of firstly draining water on the ground surface or in a hole to reduce water pressure, then pre-supporting by adopting a small advance guide pipe or a pipe shed, grouting and solidifying collapse loose bodies, and finally erecting a section steel arch and spraying concrete for strong supporting. However, under the special and severe engineering conditions of water-rich weak broken surrounding rock, such conventional methods expose systematic inadequacies and performance limitations: (1) The procedures of water drainage, grouting, supporting and the like are often implemented step by step, the connection is not tight, and the space-time synergy is not formed. In the process conversion gap, the stress of surrounding rock is continuously adjusted, so that secondary instability is extremely easy to occur, and the passive cycle of collapse-treatment-re-collapse is involved. (2) The consolidation effect is limited, an effective bearing arch is difficult to form, under the dynamic water environment, the conventional grouting material is easy to be diluted and washed away by water flow, the slurry diffusion range and the consolidation strength are difficult to control, the modification effect on loose broken bodies is not ideal, an artificial bearing arch with enough strength and integrity cannot be formed, and the temporary support system foundation is weak. (3) The supporting structure is passively stressed, so that the safety risk is high, and the traditional steel arch supporting is mostly erected after surrounding rock deformation occurs, and belongs to a passive bearing structure. Under the continuous uneven deformation and the bias load, the supporting structure is easy to twist and break, and needs to be repeatedly disassembled and replaced, so that the construction efficiency is low, and the exposure time of operators in a dangerous area is greatly prolonged. (4) The superposition of the problems makes the whole rescue treatment process lengthy and repeated, and a great amount of time is consumed on waiting for solidification of slurry, stabilizing the supporting structure and treating secondary problems, so that the aims of rapidly controlling dangerous situations and recovering construction cannot be realized, and the cost of manpower, materials and time is rapidly increased. Therefore, the development of a rapid treatment method capable of realizing systematic modification of surrounding rock, active load control and integrated cooperative operation of various procedures becomes an urgent need for overcoming the technical problem of collapse of the water-rich weak broken tunnel. The method has the core aim of converting loose broken water-rich disaster bodies into a stable permanent bearing system formed by the cooperation of improved surrounding rock and an artificial structure in the shortest time, so that the extremely bad geological section can be safely and efficiently traversed, and the bottleneck of the traditional technology ca