Honeycomb-shaped composite tunnel supporting system

Abstract

The utility model discloses a honeycomb-shaped composite tunnel supporting system which comprises an outer-layer flexible energy absorption layer, an outer-layer honeycomb support, an inner-layer flexible energy absorption layer and an inner-layer honeycomb support which are sequentially arranged from outside to inside in the radial direction of a tunnel, and multiple sets of long anchor rods and short anchor rods are vertically arranged on the outer side of the outer-layer flexible energy absorption layer in a staggered mode. The outer-layer honeycomb support and the inner-layer honeycomb support are formed by sequentially and fixedly connecting a plurality of honeycomb blocks end to end, honeycomb holes of the honeycomb blocks of the outer-layer honeycomb support face upwards and are filled with self-healing concrete, and honeycomb holes of the inner-layer honeycomb support face the vertical section of the tunnel; by arranging the double-layer honeycomb-shaped composite structure, concentrated stress can be quickly and uniformly dispersed to multiple directions of the whole support system, the support system can be synergistically stressed in the axial direction, the radial direction or other complex stress directions, and stable multidirectional bearing capacity can be still kept under multidirectional extrusion of soft rocks; and the tunnel safety is effectively ensured.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, specifically a honeycomb composite tunnel support system. Background Technology

[0002] Tunnels in high-intensity, high-risk mountainous areas are characterized by large spans, complex geological conditions, and frequent earthquakes. Under high stress conditions, they are highly susceptible to damage such as rock bursts and large deformations in soft rock. Traditional support systems are mostly passive, such as steel bracing and shotcrete support. These support structures can only provide limited support in one direction, either axial or radial. When a rock burst generates powerful impact energy, this unidirectional stress pattern makes it difficult for the support system to fully resist complex stresses. Furthermore, soft rock is characterized by low strength, large deformation, and significant rheological properties. When encountering seismic forces in different directions, soft rock rapidly undergoes severe torsional deformation under multidirectional compression, losing its load-bearing capacity. Utility Model Content

[0003] The purpose of this invention is to provide a honeycomb composite tunnel support system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: it includes an outer flexible energy-absorbing layer, an outer honeycomb support, an inner flexible energy-absorbing layer, and an inner honeycomb support arranged sequentially from the outside to the inside along the radial direction of the tunnel. Multiple sets of long and short anchor rods are vertically staggered on the outer side of the outer flexible energy-absorbing layer. Both the outer and inner honeycomb supports are composed of multiple honeycomb blocks connected end-to-end in sequence. The honeycomb holes of the outer honeycomb support are oriented upwards and filled with self-healing concrete. The honeycomb holes of the inner honeycomb support are oriented towards the vertical section of the tunnel.

[0005] Furthermore, both the outer flexible energy-absorbing layer and the inner flexible energy-absorbing layer are mesh structures woven from basalt fiber material.

[0006] Basalt fiber has excellent tensile strength. When basalt is woven into a mesh structure, it can absorb energy through fiber stretching when the surrounding rock of the tunnel deforms, reducing the impact on the internal structure of the tunnel.

[0007] Furthermore, each end of the honeycomb block is provided with a convex connecting fastener and a concave connecting fastener. The concave connecting fastener is provided with a slot that matches the shape of the convex connecting fastener. The honeycomb blocks are connected to each other by the convex connecting fastener and the concave connecting fastener.

[0008] The fastener connection facilitates the assembly and installation of honeycomb blocks.

[0009] Furthermore, the honeycomb hole sidewalls of the outer honeycomb support honeycomb block are provided with flow holes.

[0010] By setting flow holes, the self-healing process and the flow of concrete between the honeycomb pores are facilitated, thereby improving the structural consistency of the outer honeycomb support.

[0011] Furthermore, the end faces of the convex and concave connecting fasteners are provided with corresponding through holes, and fixing bolts are inserted through the through holes and fixed by nuts.

[0012] The convex and concave fasteners are fixed with bolts to prevent the honeycomb blocks from sliding or misaligning.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention utilizes a double-layer honeycomb composite structure with an outer honeycomb support and an inner honeycomb support. When rockburst impacts, the basalt fiber in the outer flexible energy-absorbing layer first absorbs energy through stretching. The staggered long and short anchors resist the deformation of the surrounding rock. The honeycomb block layout in different directions of the outer and inner honeycomb supports can quickly and evenly distribute concentrated stress to multiple directions throughout the support system. Whether in the axial, radial, or other complex stress directions, the support system can work together to bear the force and maintain stable multi-directional bearing capacity under multi-directional compression of soft rock, effectively ensuring tunnel safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the honeycomb composite tunnel support system provided in this embodiment of the utility model;

[0016] Figure 2 This is a top view of a honeycomb block provided in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the honeycomb block connection structure provided in an embodiment of the present invention;

[0018] Figure 4 This is a diagram of the internal structure of a honeycomb block provided in an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the outer flexible energy-absorbing layer structure provided in an embodiment of the present invention;

[0020] In the diagram, 1-outer flexible energy-absorbing layer, 2-outer honeycomb support, 3-inner flexible energy-absorbing layer, 4-inner honeycomb support, 5-long anchor rod, 6-short anchor rod, 7-honeycomb hole, 8-convex connecting fastener, 9-concave connecting fastener, 10-flow hole, 11-fixing bolt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-5 This utility model provides a technical solution: a honeycomb composite tunnel support system, including an outer flexible energy-absorbing layer 1, an outer honeycomb support 2, an inner flexible energy-absorbing layer 3, and an inner honeycomb support 4 arranged sequentially from the outside to the inside along the radial direction of the tunnel. The outer flexible energy-absorbing layer 1 and the inner flexible energy-absorbing layer 3 are both mesh structures woven from basalt fiber material, and multiple sets of long anchors 5 and short anchors 6 are vertically staggered on the outer side of the outer flexible energy-absorbing layer 1.

[0023] Both the outer honeycomb support 2 and the inner honeycomb support 4 are composed of multiple honeycomb blocks connected end to end in sequence. The honeycomb holes 7 of the honeycomb blocks of the outer honeycomb support 2 are set facing upwards, and the honeycomb holes 7 are filled with self-healing concrete. The honeycomb holes 7 of the inner honeycomb support 4 are set facing the vertical section of the tunnel. In order to facilitate the flow of self-healing concrete and thus ensure the repair effect of self-healing concrete, the sidewall of the honeycomb holes 7 of the honeycomb blocks of the outer honeycomb support 2 is provided with flow holes 10.

[0024] To facilitate the assembly of the outer honeycomb support 2 and the inner honeycomb support 4 during tunnel construction and improve construction efficiency, in this embodiment, convex connecting fasteners 8 and concave connecting fasteners 9 are respectively provided at the beginning and end of the honeycomb block. The concave connecting fastener 9 is provided with a slot that matches the shape of the convex connecting fastener 8. The honeycomb blocks are connected by the convex connecting fastener 8 and the concave connecting fastener 9, and the end faces of the convex connecting fastener 8 and the concave connecting fastener 9 are provided with corresponding through holes. Fixing bolts 11 are inserted through the through holes and fixed by nuts.

[0025] It should be noted that the self-healing concrete used in this invention is prepared and applied using existing mature technologies. In this embodiment, the basic formula of the self-healing concrete is: C40 concrete mixed with 10% fly ash + 5% silica fume, with a water-cement ratio of 0.35, and an accelerator (3% admixture) is added to reduce the rebound rate of the self-healing concrete to <10%. The microbial capsules are evenly distributed in the concrete with a density of 8 capsules / cm³. 3The microbial capsules are mainly composed of Bacillus subtilis spores (survival period ≥ 50 years). The Bacillus subtilis spores are encapsulated in a pH-responsive polymer shell, and sensors are pre-embedded in the self-healing concrete to monitor cracks, temperature, and stress conditions, connected to a cloud monitoring platform. When the width of the self-healing concrete crack is ≥ 0.1 mm, the spray system automatically activates to spray nutrient solution (containing urea and calcium ions) at a rate of 0.5 L / m³. 2 Apply once daily for 3 consecutive days to allow microorganisms to secrete CaCO3, which fills and repairs self-healing concrete cracks.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cellular composite tunnel lining system, characterized in that: The outer layer flexible energy absorption layer, the outer layer honeycomb support, the inner layer flexible energy absorption layer and the inner layer honeycomb support are sequentially arranged along the radial direction of the tunnel from outside to inside, and a plurality of groups of long anchor rods and short anchor rods are vertically staggered on the outside of the outer layer flexible energy absorption layer; the outer layer honeycomb support and the inner layer honeycomb support are both composed of a plurality of honeycomb blocks which are fixedly connected in sequence; the honeycomb holes of the honeycomb blocks of the outer layer honeycomb support are upwardly arranged and filled with self-healing concrete; and the honeycomb holes of the inner layer honeycomb support are arranged towards the vertical section of the tunnel.

2. The cellular composite tunnel lining system according to claim 1, characterized in that: The outer layer flexible energy absorption layer and the inner layer flexible energy absorption layer are both net structures woven by basalt fiber materials.

3. The cellular composite tunnel lining system according to claim 1, characterized in that: The honeycomb blocks are respectively provided with convex connecting fasteners and concave connecting fasteners at the two ends thereof, the concave connecting fasteners are provided with clamping grooves matched with the outer shapes of the convex connecting fasteners, and the honeycomb blocks are connected by clamping the convex connecting fasteners and the concave connecting fasteners.

4. The cellular composite tunnel lining system according to claim 1, characterized in that: The side walls of the honeycomb holes of the honeycomb blocks of the outer layer honeycomb support are provided with flow-through holes.

5. The honeycomb composite tunnel lining system according to claim 3, characterized in that: The end faces of the convex connecting fasteners and the concave connecting fasteners are provided with corresponding through holes, and fixing bolts are arranged in the through holes and fixed by nuts.

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