CN-121556889-B - Yielding support structure and construction method thereof

CN121556889BCN 121556889 BCN121556889 BCN 121556889BCN-121556889-B

Abstract

The invention relates to the technical field of tunnel supporting engineering and discloses a yielding supporting structure and a construction method thereof, wherein the yielding supporting structure comprises a supporting structure and a plurality of connecting structures, the supporting structure comprises a first component, a plurality of second components and a third component, the first component and the third component are oppositely arranged, and all the second components are arranged between the first component and the third component; the connecting structure is arranged between the first component and the second component, between the second component and the third component or between two adjacent second components, and any connecting structure has deformation to provide supporting force gradually reduced to be constant; any assembly comprises a supporting unit and a plurality of penetrating units, wherein the supporting unit is suitable for being connected with a connecting structure, any penetrating unit comprises a penetrating piece, a sliding piece and an adapter piece, the penetrating piece is arranged on the supporting unit in a penetrating mode, the sliding piece is arranged at one end, far away from the supporting unit, of the penetrating piece, two ends of the adapter piece are connected with the sliding piece and the supporting unit, and the deformation capacity of the yielding supporting structure is improved.

Inventors

ZHANG PENG
Mao Bingtian
Sun Chuo
CHEN JIAXU
LIU XINLONG

Assignees

国能经济技术研究院有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (1)

1. A construction method is applied to a yielding support structure and is characterized in that, The yielding support structure comprises: The support structure (1) comprises a first component (11), a plurality of second components (12) and a third component (13), wherein the first component (11) and the third component (13) are oppositely arranged, all the second components (12) are arranged between the first component (11) and the third component (13), and any one of the components is arranged in an extending mode along the axial direction of a tunnel; -a number of connection structures (2), any one of said connection structures (2) being arranged between said first component (11) and said second component (12), between said second component (12) and said third component (13) or between two adjacent said second components (12), any one of said connection structures (2) being configured with a deformation to provide a gradual decrease to a constant supporting force; Any one of the components comprises a supporting unit (131) and a plurality of penetrating units (132), the supporting unit (131) is suitable for being connected with the connecting structure (2), any one of the penetrating units (132) comprises a penetrating piece, a sliding piece and a switching piece (1323), the switching piece (1323) is a steel strand, the penetrating piece is arranged on the supporting unit (131) in a penetrating way, the sliding piece is arranged at one end, far away from the supporting unit (131), of the penetrating piece, one end of the switching piece (1323) is connected with the sliding piece, and the other end of the switching piece is connected with the supporting unit (131); Under the pressure of the surrounding rock, the connecting structure (2) is suitable for deforming to provide a constant supporting force, the adjacent supporting units (131) are suitable for approaching each other, and the sliding piece is suitable for moving towards the inside of the penetrating piece under the tensile force of the adapter piece (1323) so as to adapt to the deformation amount of the connecting structure (2); The penetrating piece is provided with a containing cavity with two ends open, the adapter piece (1323) is arranged in the containing cavity, and the sliding piece is suitable for moving towards the containing cavity under the action of the tensile force of the adapter piece (1323); The penetrating unit (132) further comprises a sliding fit piece (1324), the sliding fit piece (1324) is configured to have elasticity, the sliding fit piece (1324) is provided with a sliding cavity communicated with the containing cavity, the sliding fit piece (1324) is arranged at one end of the penetrating piece far away from the supporting unit (131), the sliding piece is arranged at one end of the sliding fit piece (1324) far away from the penetrating piece, and the sliding piece is suitable for moving towards the sliding cavity under the action of the tensile force of the adapter piece (1323); the outer diameter of the sliding piece is larger than the inner diameter of the sliding cavity, and the inner diameter of the sliding cavity is larger than the inner diameter of the accommodating cavity; the outer surface of the sliding fit piece (1324) is provided with a plurality of concave parts at intervals, the concave parts extend towards the other end direction of one end of the sliding fit piece (1324), and the depth of the concave parts is half of the wall thickness of the sliding fit piece (1324); The penetrating unit (132) further comprises a fixing piece (1325) and a clamping piece (1326), the fixing piece (1325) is connected with the end portion, away from the sliding piece, of the penetrating piece, the clamping piece (1326) is arranged on the fixing piece (1325), the clamping piece (1326) is connected with one end, away from the sliding piece, of the adapter piece (1323) so as to fix the adapter piece (1323) in the accommodating cavity, and when the penetrating piece penetrates through the supporting unit (131), the fixing piece (1325) is abutted with the supporting unit (131) so as to fix the penetrating piece; The connecting structure (2) comprises at least two connecting pieces (21) and a deformation assembly (22), wherein the two connecting pieces (21) are oppositely arranged, any connecting piece (21) is suitable for being connected with the supporting unit (131), the deformation assembly (22) is arranged between the two connecting pieces (21), and the deformation assembly (22) is configured to have deformation so as to provide a supporting force gradually reduced to be constant; the deformation assembly (22) comprises at least two limiting pieces (221) and a plurality of deformation pieces (222), wherein any deformation piece (222) is a deformed steel, the two limiting pieces (221) are oppositely arranged between the two connecting pieces (21), and all the deformation pieces (222) are arranged between the two limiting pieces (221); The deformation assembly (22) further comprises a plurality of transfer members (223), and any one transfer member (223) is arranged between the deformation member (222) and the connecting member (21); The construction method comprises the following steps: Excavating the upper half part of a tunnel, excavating a first component (11) and a second component (12) with the radius of R1 in a circumferential manner, installing a connecting structure (2) between the first component (11) and the second component (12), then respectively vertically arranging a penetrating unit (132) towards surrounding rocks on the inner surfaces of the first component (11) and the second component (12), and finally respectively installing a fixing piece (1325) and a clamping piece (1326) on the inner sides of the first component (11) and the second component (12), and connecting one end of an adapter piece (1323) close to the components with the clamping piece (1326); The number of the connection structures (2) is configured as n, n is 2,4 or 6, the initial length of the connection structures (2) is configured as d1, d1 is 30-35cm, the length after the deformation of the connection structures (2) is configured as d2, and the relationship between the compression length of the connection structures (2) and the extension length of the adapter (1323) is that: 。

Description

Yielding support structure and construction method thereof Technical Field The invention relates to the technical field of tunnel supporting engineering, in particular to a yielding supporting structure and a construction method thereof. Background The construction of highway tunnels in China is generally based on a new Olympic method, when tunneling is carried out, a basic outline is first fried by adopting a drilling and blasting mode, in order to prevent collapse of surrounding rocks, a rigid lining formed by shotcrete and a steel arch frame and anchor rods are adopted for reinforcement, wherein the shotcrete and the steel arch frame support the surrounding rocks at the inner side of the tunnel, the anchor rods are arranged inside the surrounding rocks to play a role in reinforcing the surrounding rocks, and the surrounding rocks and the lining form a common body so as to resist the pressure of the surrounding rocks. When the stress of the tunnel is larger, the surrounding rock can generate large extrusion force on the tunnel lining, the extrusion force is reduced along with the increase of deformation, and the shotcrete, the steel arch and the anchor rod are weak in deformation capacity and are often damaged when the tunnel is slightly deformed, so that the supporting capacity of the surrounding rock is lost, and therefore, a supporting structure capable of adapting to the large deformation of the surrounding rock is needed, and the supporting structure can not be damaged on the premise of generating remarkable deformation and provides enough supporting force for the surrounding rock. The prior supporting structure which adapts to the large deformation of surrounding rock is mainly divided into two types, one is to replace a part of the lining with a flexible node, the large deformation capacity of the flexible node is utilized to prevent the rigid lining from being damaged, and the other is to replace the anchor rod with a large deformation anchor rod, namely the anchor rod cannot be broken when the anchor rod is subjected to large axial force stretching deformation, and the required axial tension can still be provided. However, both of the methods have the limitations that firstly, the single flexible joint can allow the rigid lining to generate larger deformation without damage, but the common anchor rod attached to the rigid lining can be damaged due to the large deformation of the lining, and secondly, the single large-deformation anchor rod can ensure that the anchor rod cannot be damaged in the deformation process, but the radius of the rigid lining is reduced in the shrinkage process of the rigid lining into a tunnel hole, so that large compression deformation is generated, and the rigid lining is easy to damage in the deformation process because the deformation capability of the rigid lining is weak. Disclosure of Invention The invention provides a yielding support structure and a construction method thereof, which are used for solving the problems that the existing yielding support structure is weak in deformability and is easy to damage under the action of extrusion force of surrounding rock. In a first aspect, the present invention provides a yielding support structure comprising: The support structure comprises a first component, a plurality of second components and a third component, wherein the first component and the third component are oppositely arranged, all the second components are arranged between the first component and the third component, and any component extends along the axial direction of the tunnel; a plurality of connection structures, any one of the connection structures being disposed between the first and second assemblies, between the second and third assemblies, or between two adjacent second assemblies, any one of the connection structures being configured to have a deformation to provide a gradual decrease to a constant supporting force; Any assembly comprises a supporting unit and a plurality of penetrating units, wherein the supporting unit is suitable for being connected with the connecting structure, any penetrating unit comprises a penetrating piece, a sliding piece and an adapter piece, the penetrating piece is arranged on the supporting unit in a penetrating mode, the sliding piece is arranged at one end, far away from the supporting unit, of the penetrating piece, one end of the adapter piece is connected with the sliding piece, and the other end of the adapter piece is connected with the supporting unit; Under the pressure of surrounding rock, the connecting structure is suitable for deforming to provide a constant supporting force which is continuously reduced, the adjacent supporting units are suitable for approaching each other, and the sliding piece is suitable for moving towards the inside of the penetrating piece under the tensile force of the adapter piece so as to adapt to the deformation amount of the connecting structure. The support structure has