CN115163110A - Double-partition double-control supporting system for soft rock tunnel - Google Patents
Double-partition double-control supporting system for soft rock tunnel Download PDFInfo
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- CN115163110A CN115163110A CN202210335793.7A CN202210335793A CN115163110A CN 115163110 A CN115163110 A CN 115163110A CN 202210335793 A CN202210335793 A CN 202210335793A CN 115163110 A CN115163110 A CN 115163110A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
Abstract
The invention belongs to the technical field of lining tunnels, and particularly relates to a double-partition double-control support system for a soft rock tunnel, which comprises a concrete layer, a supporting layer and a supporting layer, wherein the concrete layer covers the surface of tunnel surrounding rocks and is used for reinforcing the tunnel surrounding rocks; the high-strength flexible net covers the surface of the concrete layer; the anchor rod/cable is anchored on the tunnel surrounding rock and used for applying high-strength pretightening force to prevent the tunnel surrounding rock from expanding in a surrounding plastic area so as to provide flexible support; the supporting frames are arch frames or trusses and are erected in the tunnel to provide rigid support for the surrounding rock; the distance between the supporting frame and the surrounding rock of the tunnel is 200-400 mm. The invention adopts double-partition double-control technology to support the tunnel, and can reduce the deformation of the surrounding rock from meter level to millimeter level. Therefore, the method can ensure the minimum deformation degree of the tunnel surrounding rock on the basis of safe construction, and achieve scientific and reasonable support.
Description
Technical Field
The invention belongs to the technical field of lining tunnels, and particularly relates to a double-partition double-control supporting system for a soft rock tunnel.
Background
In recent years, with the rapid development of various current rock engineering constructions, the construction of railways and road tunnels in China is developed in a crossing manner. At present, due to the complex topography and large burial depth of a tunnel, and the influence of heterogeneity of rocks and weak broken surrounding rocks caused by geological conditions, accidents such as collapse, water inrush and mud inrush, rock burst, large deformation of soft rocks and the like occur frequently in the construction process of the tunnel, and the personal safety and the construction progress are seriously influenced.
At present, the support system adopted by tunnel surrounding rock adopts conventional anchor rods/cables for supporting. The existing support system has the following defects: 1. the supporting effect of the supporting system is poor, and when geological motion or large deformation of surrounding rocks occurs, the tunnel can generate meter-level large deformation, namely the tunnel deformation is larger than 1m;2. the supporting system is easy to lose effectiveness in the control process of the large deformation disaster of the soft rock.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a double-partition double-control supporting system for a soft rock tunnel, which can solve the technical problem of large deformation of surrounding rocks.
In order to achieve the above purpose, the invention provides the following technical scheme:
a double-partition double-control supporting system for a soft rock tunnel comprises:
the concrete layer is covered on the surface of the tunnel surrounding rock and used for reinforcing the tunnel surrounding rock;
the high-strength flexible net covers the surface of the concrete layer;
the anchor rod/cable is anchored on the tunnel surrounding rock and used for applying high-strength pretightening force to prevent the expansion of a tunnel surrounding rock plastic zone so as to provide flexible support;
the supporting frames are arch frames or trusses and are erected in the tunnel so as to provide rigid support for the surrounding rock; the distance between the support frame and the tunnel surrounding rock is 200-400 mm.
Preferably, the anchor/cable extends radially from the surface to the interior of the tunnel.
Preferably, the anchor rods/cables comprise short anchor rods/cables and long anchor rods/cables, and the short anchor rods/cables and the long anchor rods/cables are distributed in a staggered mode along the circumferential direction of the tunnel.
Preferably, the anchor rods/cables are short anchor rods/cables which are uniformly distributed along the circumferential direction of the tunnel.
Preferably, the anchor rods/cables are long anchor rods/cables which are uniformly distributed along the circumferential direction of the tunnel.
Preferably, the bolt/cable is an NPR bolt/cable.
Preferably, concrete is poured into the support frame.
Preferably, the arch is an NPR steel arch.
Preferably, the truss is an NPR steel truss.
Preferably, the timbering system further comprises: the double-layer three-dimensional truss with the inverted bottom arch is arranged at the bottom of the tunnel, and two end parts of the double-layer three-dimensional truss with the inverted bottom arch are fixedly connected with two end parts of the truss.
Has the advantages that:
the invention adopts double-partition double-control technology to support the tunnel, and can reduce the deformation of the surrounding rock from meter level to millimeter level. Therefore, the method can ensure the minimum deformation degree of the tunnel surrounding rock on the basis of safe construction, and achieve scientific and reasonable support.
The double-isolation and double-control technology means that the 'first isolation' is realized by flexibly isolating an anchor rod/cable and high-strength flexible net regulating and controlling system, and the 'first control' is realized by controlling the large deformation in a centimeter level to be small deformation in a centimeter level. Two-separation-rigid isolation of the support frame, two-control-centimeter-level small deformation control as millimeter-level micro deformation. The invention can reasonably select the supporting materials corresponding to double-partition double-control according to the surrounding rock condition of the tunnel, such as: the anchor rod/cable can be an existing anchor rod/cable or an NPR anchor rod/cable; the support frame can be a carbon steel support frame, a stainless steel support frame or an NPR steel support frame.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural view of a soft rock tunnel double-partition double-control support system in embodiment 1 of the invention;
fig. 2 is a schematic structural view of a soft rock tunnel double-isolation double-control supporting system in an embodiment 2 of the invention;
fig. 3 is a schematic structural view of a soft rock tunnel double-partition double-control support system in embodiment 3 of the invention;
fig. 4 is a schematic structural view of a soft rock tunnel double-partition double-control support system in embodiment 4 of the invention;
FIG. 5 is a schematic structural view of an NPR bolt of the present invention;
FIG. 6 is a top view of an NPR steel truss of the present invention;
FIG. 7 is a perspective view of an NPR steel truss and an inverted arch double-layer solid truss according to the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 7 at A;
FIG. 9 is an enlarged view of a portion of FIG. 7 at B;
fig. 10 is a graph of the relationship between the deformation amount of the tunnel surrounding rock and time.
The names corresponding to the reference numbers in the figures are: 1-short anchor/cable; 2-long anchor/cable; 3, tunneling; 4-a truss; 5-double-layer three-dimensional truss with inverted bottom arch; 6-high-strength flexible net; 7-W type steel belt; 8-an arch frame; 9-concrete; 101-an anchor segment; 102-a rod body; 103-a cannula; 104-sealing and grouting; 105-a cone; 106-a tray; 107-fastening nuts; 43-main bar; 44-a second connecting rod; 45-first connecting rod; 46-a connecting plate; 47-high strength bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides a design scheme of combining an anchor rod/cable and a support frame based on a large deformation control theory aiming at the problem that the conventional anchor rod and anchor cable are easy to lose effectiveness in the control process of the large deformation disaster of the soft rock and aiming at the stratum structure in front of the tunnel 3 face.
The embodiment of the double-isolation double-control supporting system of the soft rock tunnel comprises the following steps:
as shown in fig. 1 to 10, a double-isolation double-control support system for a soft rock tunnel comprises:
the concrete layer is covered on the surface of the tunnel surrounding rock and used for reinforcing the tunnel surrounding rock;
the high-strength flexible net covers the surface of the concrete layer;
the anchor rod/cable is anchored on the tunnel surrounding rock by penetrating through the high-strength flexible net and the concrete layer and is used for applying high-strength pretightening force to prevent the expansion of the tunnel surrounding rock surrounding plastic zone so as to provide flexible support;
and the support frame is an arch frame 8 or a truss 4 and is erected in the tunnel 3 so as to provide rigid support for the surrounding rock. The shape of the support frame is matched with that of the tunnel. The distance between the support frame and the tunnel surrounding rock is 200-400mm (for example: 200mm, 220mm, 250mm, 280mm, 300mm, 320mm, 350mm, 380mm or 400 mm) for releasing the deformation energy of the surrounding rock.
The invention can reduce the deformation of the surrounding rock from meter level to millimeter level under the double supporting action of the anchor rod/cable, the high-strength flexible net flexible support and the rigid support of the support frame.
In an alternative embodiment of the invention, the anchor/cable is an existing anchor or anchor cable, for example the anchor may be a wood anchor, a metal anchor, a steel bar or wire rope mortar anchor, a resin anchor or a cement anchor, and the anchor cable may be a stainless steel anchor or a carbon steel anchor.
In a preferred embodiment of the invention, the bolts/cables are NPR bolts/cables (NPR bolts or NPR anchor cables).
In the excavation process of the tunnel 3, along with the redistribution of the stress of the surrounding rocks, the surrounding rocks of the tunnel 3 deform under the action of stress load. In the deformation process of surrounding rocks, the axial force of a transverse resistance anchor rod/cable (NPR anchor rod/cable) is continuously increased under the action of the surrounding rocks, and when the axial force of an anchor cable exceeds a designed constant resistance value, the sleeve 103 is transversely expanded under the friction and extrusion action between a cone 105 in the constant resistance device and the sleeve 103, so that the macroscopic NPR structural effect is realized.
The NPR anchor rod/cable has the advantages of high pretightening force, high constant resistance value, large elongation and the like, and can flexibly isolate the tunnel 3 from the rock mass with large external deformation when geological motion or large deformation of the surrounding rock occurs after the 3 surrounding rock of the tunnel is reinforced, so that the large deformation of a meter level is controlled to be the deformation of a centimeter level (as shown in figure 10).
In an alternative embodiment of the invention, the anchor/cable extends radially from the surface to the interior of the tunnel 3. In other embodiments the anchor/cable extends at an angle to the radial direction of the tunnel.
In an alternative embodiment of the invention, the anchor rods/cables comprise short anchor rods/cables 1 and long anchor rods/cables 2, and the short anchor rods/cables 1 and the long anchor rods/cables 2 are distributed in a staggered mode along the circumferential direction of the tunnel. Preferably, the length of the long anchor/cable 2 and the short anchor/cable 1 is 11000-13000mm (e.g. 11000mm, 11500mm, 11800mm, 12000mm, 12500mm, 12800mm or 13000 mm) and 7000-8000mm (e.g. 7000mm, 7200mm, 7500mm, 7800mm or 8000 mm), respectively.
In another optional embodiment of the invention, the anchor rods/cables are all short anchor rods/cables which are uniformly distributed along the circumference of the tunnel.
In other optional embodiments of the invention, the anchor rods/cables are all long anchor rods/cables which are uniformly distributed along the circumference of the tunnel.
In an alternative embodiment of the invention, the anchor rods/cables are arranged in a plurality of rows, the anchor rods/cables are uniformly distributed in a plurality of rows along the length direction of the tunnel 3, and the row spacing is 1100-1300mm (for example, 1100mm, 1150mm, 1180mm, 1220mm, 1270mm or 1300 mm); preferably, the row pitch is 1200mm.
The spacing of each row of bolts/cables is 900-1100mm (e.g. 900mm, 950mm, 980mm, 1020mm, 1050mm, 1080mm or 1100 mm). Preferably the pitch of each row of bolts/cables is 1000mm.
The diameter of the steel strand of the anchor rod/cable is phi 20-25mm (for example: 20mm, 21mm, 22mm, 23mm, 24mm or 25 mm); preferably, the diameter of the steel strand of the anchor/cable is 21.8mm.
In an optional embodiment of the invention, the timbering system further comprises: w shaped steel area 7 lays on high-strength flexible net 6, and the NPR anchor rope passes W shaped steel area 7, high-strength flexible net 6 and concrete layer anchor in proper order inside the rock mass.
In an alternative embodiment of the invention, shown in figure 5, an NPR bolt comprises: anchor segment 101, body of rod 102, sleeve 103, sealing grout 104, cone 105, tray 106 and fastening nut 107. The inner diameter of the sleeve 103 is 32mm and the diameter of the shaft body 102 is 22mm.
The cone 105 is piston-shaped and is inserted into the sleeve 103. The inner diameter of the sleeve 103 is slightly larger than the diameter of the large diameter end of the cone 105. The large diameter end of the cone 105 is located at one end of the casing 103 close to the surface of the tunnel 3, the small diameter end of the cone 105 is fixedly connected with the rod body 102 (rebar), and one end of the rod body 102 far away from the cone 105 is provided with an anchoring section 101. The casing 103 is filled with sealing grout 104. A high-strength flexible net 6 and a W-shaped steel belt 7 are arranged between the tray 106 and the surrounding rock surface of the tunnel 3, the tray 106 is arranged on the outer side of the W-shaped steel belt 7, and the tray 106 is used for transmitting the deformation of the rock body to the sleeve 103. The fastening nut 107 is a force-transmitting device.
NPR (Negative Poisson's ratio Negative Poisson ratio) anchor rod working principle: when an outward axial load (tension) is applied to the free end of the NPR bolt, the sleeve 103 will produce a displacement opposite to the anchoring end, which is the deformation of the bolt. The movement of the sleeve 103 corresponds to a sliding movement of the cone 105 relative to the inner wall of the sleeve 103. As the cone 105 slides within the casing 103, the casing 103 undergoes radial expansion deformation, thereby creating a Negative Poisson Ratio (NPR) structural effect.
In an alternative embodiment of the invention, the support frame is cast with concrete. Specifically, the C30 concrete is poured for 50-80cm (for example, 50cm, 55cm, 60cm, 65cm, 70cm, 75cm or 80 cm) at one time, and the support frame is poured in.
In an alternative embodiment of the invention, the arch is an NPR steel arch (made of NPR material). In other embodiments, the arch may also be a carbon steel arch or a stainless steel arch. The both ends of bow member support in the tunnel ground, and the bottom of bow member can directly consolidate in the tunnel bottom, also can pile the riveting, and the intensity of specifically seeing the tunnel itself can use in a flexible way.
In another alternative embodiment of the invention, the truss 4 is a carbon steel truss or a stainless steel truss.
In a preferred embodiment of the invention, the truss 4 is an NPR steel truss. Specifically, the NPR steel truss is made of NPR steel materials, and characteristics of the NPR steel materials are fully utilized. The NPR material has the characteristics of no magnetism, high strength, high toughness, high uniform extension and can adapt to large deformation. "the NPR material deformation can reach 25% -37%. The yield strength point value of ordinary steel is only one third of that of NPR new material, and when the force reaches 85 kilonewtons, the deformation is irreversible. NPR steel, however, does not break until the force continues to be applied to 230 kN.
Therefore, the NPR steel truss 4 has the characteristics of absorbing the uneven deformation of surrounding rocks, transferring the unbalanced stress of the truss, converting bending resistance (torsion) into compression resistance (pulling) and the like, playing a role in rigid isolation on the tunnel 3, and controlling centimeter-level small deformation into millimeter-level micro deformation (as shown in figure 10).
In an alternative embodiment of the invention, the support system further comprises: the double-layer three-dimensional truss 5 with the inverted arch is arranged at the bottom of the tunnel 3, and two end parts of the double-layer three-dimensional truss 5 with the inverted arch are fixedly connected with two end parts of the truss. The truss is a stainless steel truss or an NPR steel truss. The double-layer three-dimensional truss 5 with the inverted bottom arch has the function of forming a closed-loop supporting truss with the double-layer truss, and the stability of the truss is improved. The inverted arch double-layer space truss 5 is buried at the bottom of the tunnel.
In an optional embodiment of the present invention, the NPR steel truss is a double-layer truss, two main rods 43 arranged at intervals are correspondingly arranged on both the upper layer and the lower layer of the NPR steel truss, the main rods 43 are circumferentially adapted to the tunnel 3, adjacent main rods 43 are connected by first connecting rods 45 and second connecting rods 44, the first connecting rods 45 are vertical to the main rods 43, and the second connecting rods 44 are arranged in an inclined manner with respect to the main rods 43. The first connecting rod 45 and the second connecting rod 44 are both welded on the main rod 43.
The main rod 43, the first connecting rod 45 and the second connecting rod 44 are all made of NPR steel. Specifically, the main rod 43 is an I-steel (e.g., I25b I-steel), the first connecting rod 45 is a T-steel beam, and the second connecting rod 44 is a deformed steel bar. The length of the T-beam is 50-80cm (e.g. 50cm, 55cm, 60cm, 65cm, 70cm, 75cm or 80 cm), preferably 60cm. The diameter of the deformed steel bar is 20-25mm (for example, 20cm, 21cm, 22cm, 23cm, 24cm or 25 cm), and preferably, the diameter of the deformed steel bar is 22mm.
In an optional embodiment of the invention, the inverted-arch double-layer three-dimensional truss 5 and the NPR steel truss are fixedly connected through a high-strength bolt 47, specifically, a connecting plate 46 is correspondingly arranged at the end of the inverted-arch double-layer three-dimensional truss 5 and the NPR steel truss, and a mounting hole for inserting the high-strength bolt 47 is formed in the connecting plate 46.
The NPR steel truss is of a multi-section structure, adjacent sections of the NPR steel truss are connected through high-strength bolts 47, specifically, connecting plates 46 are correspondingly arranged between adjacent sections of the NPR steel truss 4, and mounting holes for inserting the high-strength bolts 47 are formed in the connecting plates 46.
In other embodiments of the invention, adjacent segments of the NPR steel truss 4 are connected by welding.
In an optional embodiment of the invention, the double-partition double-control support system for the soft rock tunnel further comprises an advanced grouting guide pipe which is buried in the tunnel face and used for performing advanced grouting on the tunnel face after tunnel excavation so as to enhance the strength of the tunnel face and control meter-level large deformation of the soft rock tunnel.
As shown in fig. 10, in the graph of the relationship between the deformation amount of the surrounding rock and the time, the abscissa indicates the time, the ordinate indicates the deformation amount of the surrounding rock, the abscissa indicates the arch or the truss, the dotted line indicates the deformation amount of the surrounding rock subjected to the dual actions of the arch or the truss and the anchor/cable with time, and after the deformation of the surrounding rock reaches the position of the arch or the truss from the zero point with time, the deformation of the surrounding rock is controlled at the position and is in a millimeter-scale micro-deformation. Therefore, the invention can control the deformation of the surrounding rock to millimeter-scale micro-deformation under the action of the arch frame 8/truss and the anchor rod/cable.
Example 1
As shown in fig. 1, a double-isolation double-control support system for a soft rock tunnel comprises: the steel truss comprises a concrete layer, a high-strength flexible net 6, a W-shaped steel belt 7, a truss 4, an inverted arch double-layer three-dimensional truss 5, long anchor rods/cables 2 and short anchor rods/cables 1. The long anchor rods/cables 2 and the short anchor rods/cables 1 sequentially penetrate through the W-shaped steel belts 7, the high-strength flexible net 6 and the concrete layer to be anchored in the rock body. The length of the long anchor/cable 2 and the short anchor/cable 1 is 12300mm and 7300mm, respectively. The short anchor rods/cables 1 and the long anchor rods/cables 2 are distributed in a staggered mode along the circumferential direction of the tunnel. The distance between the truss and the tunnel surrounding rock is 300mm.
Example 2
As shown in fig. 2, the embodiment 2 is different from the embodiment 1 in that the supporting system of the embodiment 2 totally adopts long bolts/cables 2 (with the length of 12300 mm), and the long bolts/cables 2 are uniformly distributed along the circumference of the tunnel 3.
Example 3
As shown in fig. 3, a double-isolation double-control support system for a soft rock tunnel comprises: the device comprises a concrete layer, a high-strength flexible net 6, a W-shaped steel belt 7, an arch frame 8 and a long anchor rod/cable 2. The long anchor rods/cables 2 are uniformly distributed along the circumferential direction of the tunnel 3. Concrete 9 is poured in the supporting frame poured in the arch center 8.
Example 4
As shown in fig. 4, the embodiment 4 is different from the embodiment 3 in that the support system of the embodiment 4 totally adopts long anchor rods/cables 2 (with the length of 12300 mm), and the long anchor rods/cables 2 are uniformly distributed along the circumference of the tunnel 3.
It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. Two accuse support systems that separate in soft rock tunnel which characterized in that includes:
the concrete layer is covered on the surface of the tunnel surrounding rock and used for reinforcing the tunnel surrounding rock;
the high-strength flexible net covers the surface of the concrete layer;
the anchor rod/cable is anchored on the tunnel surrounding rock and used for applying high-strength pretightening force to prevent the tunnel surrounding rock from expanding in a surrounding plastic area so as to provide flexible support;
the supporting frames are arch frames or trusses and are erected in the tunnel to provide rigid support for the surrounding rock; the distance between the support frame and the tunnel surrounding rock is 200-400 mm.
2. The double-spaced double-control support system for the soft rock tunnel according to claim 1, wherein the anchor rods/cables extend from the surface to the interior in the radial direction of the tunnel.
3. The soft rock tunnel double-partition double-control support system according to claim 1, wherein the anchor rods/cables comprise short anchor rods/cables and long anchor rods/cables, and the short anchor rods/cables and the long anchor rods/cables are distributed in a staggered mode along the circumferential direction of the tunnel.
4. The soft rock tunnel double-partition double-control support system according to claim 1, wherein the anchor rods/cables are short anchor rods/cables which are uniformly distributed along the circumferential direction of the tunnel.
5. The double-spaced double-control support system for the soft rock tunnel according to claim 1, wherein the anchor rods/cables are long anchor rods/cables which are uniformly distributed along the circumferential direction of the tunnel.
6. The soft rock tunnel double-spaced double-control support system according to any one of claims 1-5, wherein the anchor/cable is an NPR anchor/cable.
7. The soft rock tunnel double-partition double-control supporting system as claimed in claim 1, wherein concrete is poured into the supporting frames.
8. The double-spaced double-control supporting system for the soft rock tunnel according to claim 1 or 7, wherein the arch is an NPR steel arch.
9. The soft rock tunnel double-spaced double-control support system according to claim 1 or 7, wherein the truss is an NPR steel truss.
10. The soft rock tunnel double-partition double-control support system according to claim 1, further comprising: the double-layer three-dimensional truss with the inverted bottom arch is arranged at the bottom of the tunnel, and two end parts of the double-layer three-dimensional truss with the inverted bottom arch are fixedly connected with two end parts of the truss.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116201573A (en) * | 2023-05-06 | 2023-06-02 | 中国矿业大学(北京) | Construction method for rock burst tunnel prevention and control system |
| CN116641724A (en) * | 2023-07-27 | 2023-08-25 | 中国矿业大学(北京) | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
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| CN116641724A (en) * | 2023-07-27 | 2023-08-25 | 中国矿业大学(北京) | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
| CN116641724B (en) * | 2023-07-27 | 2023-10-13 | 中国矿业大学(北京) | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
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