CN111963210A - Roadway supporting structure and construction method thereof - Google Patents
Roadway supporting structure and construction method thereof Download PDFInfo
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- CN111963210A CN111963210A CN202010958998.1A CN202010958998A CN111963210A CN 111963210 A CN111963210 A CN 111963210A CN 202010958998 A CN202010958998 A CN 202010958998A CN 111963210 A CN111963210 A CN 111963210A
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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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a roadway supporting structure and a construction method thereof, which relate to the technical field of roadway supporting, and the technical scheme is characterized in that: the device comprises a short-distance blocking layer, a middle-distance transition flexible layer, a long-distance continuous layer, a plurality of anchor rods, a plurality of anchor cables, a plurality of drill holes and a cylindrical bag; the cylindrical bag is internally provided with static breaker slurry. The supporting layers with three progressive relations formed by the roadway supporting structure can change the distribution state of the stress of the roadway surrounding rocks, transfer the concentrated region of the stress of the roadway surrounding rocks and the peak value thereof to a longer-distance continuous layer, effectively obstruct the propagation of deep crustal stress, keep the stability of the deep roadway surrounding rocks, effectively control the deep roadway, and coordinate the deformation of a short-distance obstructing layer and a long-distance continuous layer; meanwhile, the roadway supporting structure has wide application range and is suitable for newly excavated roadways, repaired roadways and deep rock roadway engineering; the roadway supporting structure is simple in construction method, easy to implement, good in supporting effect and high in popularization and application value.
Description
Technical Field
The invention relates to the technical field of roadway support, in particular to a roadway support structure and a construction method thereof.
Background
Coal mine in China is mainly underground mining, and is required to be excavated into a tunnel for mining coal, and the tunnel is a variety of drilled passages between the ground surface and an ore body and is used for carrying ore, ventilating, draining water, pedestrians, various necessary preparation projects newly excavated for mining the ore by metallurgical equipment, and the like. The roadway support is adopted to keep the roadway smooth and the surrounding rock stable, so that the method has important significance for coal mine construction and production. The basic purpose of supporting the roadway is to alleviate and reduce the movement of surrounding rocks, so that the section of the roadway is not excessively reduced, and meanwhile, the scattered and damaged surrounding rocks are prevented from falling.
At present, the anchor-shotcrete support technology is widely applied to coal mine roadways. The sprayed concrete and the anchor rod surrounding rock work together to form a supporting system with sufficient resistance; the spraying layer has the functions of timely sealing the surrounding rock, preventing weathering and deliquescence, supporting and filling and reinforcing the surrounding rock, distributing external force and the like. The anchor-spraying support is a safe, reliable, economical and feasible technology with strong adaptability, and is a main support form in the current support engineering.
The roadway supporting structure in the prior art is easy to cause the increase of concentrated stress and partial stress in roadway surrounding rocks along with the increase of mining depth, so that the degeneration characteristics of the surrounding rocks are obviously changed, and the deep roadway surrounding rocks are easy to be unstable due to the propagation of deep ground stress of the roadway, and the roadway surrounding rocks are easy to show large deformation. Therefore, the invention aims to design and provide a roadway supporting structure which has a wide application range and is suitable for newly-excavated roadways, repaired roadways and deep rock roadway engineering and a construction method thereof so as to solve the problems.
Disclosure of Invention
The invention aims to provide a roadway supporting structure and a construction method thereof, the roadway supporting structure forms three supporting levels with progressive relation, the distribution state of roadway surrounding rock stress can be changed, and a concentrated region of the roadway surrounding rock stress and a peak value thereof are transferred to a longer-distance continuous layer, so that the propagation of deep ground stress is effectively blocked, the stability of deep roadway surrounding rock can be kept, the deep roadway can be effectively controlled, and the deformation of a short-distance blocking layer and a long-distance continuous layer is coordinated; meanwhile, the roadway supporting structure has wide application range, is suitable for newly tunneling roadways and repairing roadways, and is particularly suitable for deep rock roadway engineering; the roadway supporting structure is simple in construction method, easy to implement, good in supporting effect and wide in popularization and application value.
The technical purpose of the invention is realized by the following technical scheme: a roadway supporting structure comprises a short-distance blocking layer, a medium-distance transition flexible layer and a long-distance continuous layer which are sequentially advanced from a roadway wall to the depth of surrounding rocks around a roadway, wherein a plurality of anchor rods are arranged in the short-distance blocking layer; a plurality of anchor cables are arranged in the long-distance continuous layer, and the end parts of the anchor cables are positioned at the farthest position of the long-distance continuous layer after passing through the short-distance blocking layer and the middle-distance transition flexible layer by the tunnel wall; the middle-distance transition flexible layer is positioned between the short-distance blocking layer and the long-distance continuous layer, and the distance between the edge of the middle-distance transition flexible layer close to the long-distance continuous layer and the edge of the short-distance blocking layer is 1 m; a plurality of drill holes are formed in the section of the roadway; the drilling hole is provided with a cylindrical bag; and a static breaker slurry is arranged in the cylindrical bag.
By adopting the technical scheme, in the construction of supporting the tunneling roadway, three supporting layers with progressive relation are formed on the surrounding rocks around the roadway through the short-distance blocking layer, the medium-distance transition soft layer and the long-distance continuous layer which are applied in multiple steps and layers, so that the distribution state of the stress of the surrounding rocks around the roadway can be changed, the stress concentration area and the peak value of the surrounding rocks around the roadway are transferred to the long-distance continuous layer, the stress spread at the deep part of the surrounding rocks of the roadway is effectively blocked, and the stability of the surrounding rocks of the deep roadway is kept; through the medium-distance transition soft layer, the stress of the surrounding rock of the deep roadway can be effectively controlled, and the deformation of the short-distance blocking layer and the deformation of the long-distance continuous layer are coordinated; a short-distance blocking layer formed by the anchor rod, a support object within the length range of the anchor rod and rock is used as a first layer of reinforcing support; a remote continuous layer formed by the anchor cable, a support object within the length range of the anchor cable and rock is used as a third layer of reinforcing support; the cylindrical bag is convenient to install by drilling; the cylindrical bag filled with the static breaking agent slurry is convenient for supporting and reinforcing the short-distance blocking layer and the middle-distance transition soft layer; the supporting layers with three progressive relations formed by the roadway supporting structure can change the distribution state of roadway surrounding rock stress, and transfer the concentrated region and the peak value of the roadway surrounding rock stress to a longer-distance continuous layer, thereby effectively blocking the propagation of deep crustal stress, keeping the stability of the deep roadway surrounding rock, effectively controlling the deep roadway and coordinating the deformation of a short-distance blocking layer and a long-distance continuous layer; meanwhile, the roadway supporting structure is wide in application range, is suitable for newly tunneling roadways and repairing roadways, and is particularly suitable for deep rock roadway engineering.
The invention is further configured to: the thickness of the short-distance blocking layer is 2.5-3.0 m; the thickness of the intermediate-distance transition flexible layer is 0.5-1 m; the thickness of the remote continuous layer is 4-5 m.
By adopting the technical scheme, the thickness of the short-distance blocking layer is 2.5-3.0m, the thickness of the medium-distance transition flexible layer is 0.5-1m, and the thickness of the long-distance continuous layer is 4-5m, so that the stability of each support layer is conveniently ensured.
The invention is further configured to: the diameter of the drill hole is 28-32mm, the depth of the drill hole is 3-4m, and the row spacing between the drill holes is 2.0 m.
By adopting the technical scheme, the diameter of the drilled hole is 28-32mm, the depth of the drilled hole is 3-4m, and the row spacing between the drilled holes is 2.0m, so that the supporting and reinforcing effects on the short-distance blocking layer and the middle-distance transition soft layer after a cylindrical bag filled with static crushing agent slurry is placed in the drilled hole are ensured.
The invention is further configured to: the diameter of the cylindrical bag is smaller than that of the drilled hole, and the length of the cylindrical bag is 0.5-1.0 m.
Through adopting above-mentioned technical scheme, the diameter of cylinder sack is less than the diameter of drilling, and the operation of cylinder sack to putting into the drilling bottom of being convenient for.
The invention is further configured to: the two end parts of the cylindrical bag are provided with round platform type barbs.
Through adopting above-mentioned technical scheme, through round platform type barb, be convenient for prevent to put into the cylinder sack in the drilling and slide out in the drilling.
The invention is further configured to: the cylindrical bag is made of a nylon casing film.
Through adopting above-mentioned technical scheme, the cylinder sack is the nylon casing membrane material, is convenient for ensure that the static breaker thick liquid of packing into in the cylinder sack blocks the reinforcing effect on layer and the middle distance transition soft layer closely.
The invention also provides a construction method of the roadway supporting structure, which comprises the following steps:
s1, constructing a short-distance blocking layer, and performing the processes of guniting, anchoring and grouting support on surrounding rocks around the roadway in the roadway according to an on-site roadway support scheme to complete construction of the short-distance blocking layer;
s2, constructing a long-distance continuous layer, constructing anchor cables and grouting supports in the deep surrounding rock around the roadway to complete construction of the long-distance continuous layer, and forming a medium-distance transition flexible layer between the long-distance continuous layer and the short-distance blocking layer;
s3, drilling holes, namely drilling a plurality of drilled holes in different directions of the cross section of the roadway, wherein the depth of each drilled hole is 3-4m, the diameter of each drilled hole is 28-32mm, and the row spacing between the drilled holes is 2 m;
s4, filling a cylindrical bag, and filling the mixed static crushing agent slurry into the cylindrical bag with the length of 0.5-1m, wherein the diameter of the cylindrical bag is smaller than that of the drilled hole drilled in the step S3;
and S5, sealing the cylindrical bag filled with the static breaker slurry in the step S4, then feeding the sealed cylindrical bag to the bottom of the drill hole, and filling the drill hole with cement slurry by injecting the cement slurry into the drill hole.
The invention is further configured to: the thickness of the short-distance blocking layer in the step S1 is 2.5-3 m; the thickness of the intermediate-distance transition flexible layer in the step S2 is 0.5-1m, and the thickness of the long-distance continuous layer is 4-5 m.
The invention is further configured to: the cylindrical bag in the step S4 is made of a nylon casing film, and two ends of the cylindrical bag are provided with truncated cone-shaped barbs for preventing the cylindrical bag from sliding out of the drilled hole.
The invention is further configured to: in the drilling process in the step S3, 8 drill holes are respectively drilled in 8 different directions of the cross section of the roadway.
In conclusion, the invention has the following beneficial effects: the roadway supporting structure forms three supporting layers with progressive relation on surrounding rocks around the roadway through a short-distance blocking layer, a medium-distance transition flexible layer and a long-distance continuous layer which are constructed in multiple steps and layers, can change the distribution state of stress of the surrounding rocks around the roadway, and transfers the stress concentration area and the peak value of the surrounding rocks around the roadway to the long-distance continuous layer, thereby effectively blocking the stress spread at the deep part of the surrounding rocks of the roadway and keeping the stability of the surrounding rocks of the deep roadway; through the medium-distance transition soft layer, the stress of the surrounding rock of the deep roadway can be effectively controlled, and the deformation of the short-distance blocking layer and the deformation of the long-distance continuous layer are coordinated; a short-distance blocking layer formed by the anchor rod, a support object within the length range of the anchor rod and rock is used as a first layer of reinforcing support; a remote continuous layer formed by the anchor cable, a support object within the length range of the anchor cable and rock is used as a third layer of reinforcing support; the cylindrical bag is convenient to install by drilling; the cylindrical bag filled with the static breaking agent slurry is convenient for supporting and reinforcing the short-distance blocking layer and the middle-distance transition soft layer; the supporting layers with three progressive relations formed by the roadway supporting structure can change the distribution state of roadway surrounding rock stress, and transfer the concentrated region and the peak value of the roadway surrounding rock stress to a longer-distance continuous layer, thereby effectively blocking the propagation of deep crustal stress, keeping the stability of the deep roadway surrounding rock, effectively controlling the deep roadway and coordinating the deformation of a short-distance blocking layer and a long-distance continuous layer; meanwhile, the roadway supporting structure is wide in application range, is suitable for newly tunneling roadways and repairing roadways, and is particularly suitable for deep rock roadway engineering.
Drawings
Fig. 1 is a schematic structural view of a roadway support structure in embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a cylindrical bag in example 1 of the present invention;
fig. 3 is a flowchart of a construction method of a roadway support structure in embodiment 2 of the present invention.
In the figure: 1. a short-range blocking layer; 2. a medium-distance transition layer; 3. a remote continuous layer; 4. an anchor rod; 5. an anchor cable; 6. drilling; 7. a cylindrical bag; 8. a static breaker slurry; 9. a truncated cone-shaped barb.
Detailed Description
The present invention is described in further detail below with reference to figures 1-3.
Example 1: a roadway supporting structure comprises a short-distance blocking layer 1, a medium-distance transition flexible layer 2 and a long-distance continuous layer 3 which are sequentially advanced from a roadway wall to the depth of surrounding rocks around a roadway, wherein a plurality of anchor rods 4 are arranged in the short-distance blocking layer 1. A plurality of anchor cables 5 are arranged in the long-distance continuous layer 3, and the end parts of the anchor cables 5 are positioned at the farthest position of the long-distance continuous layer 3 after passing through the short-distance blocking layer 1 and the middle-distance transition flexible layer 2 from the tunnel wall. The intermediate-distance transition flexible layer 2 is positioned between the short-distance blocking layer 1 and the long-distance continuous layer 3, and the distance between the edge of the intermediate-distance transition flexible layer 2 close to the long-distance continuous layer 3 and the edge of the short-distance blocking layer 1 is 1 m. The roadway section is provided with a plurality of drill holes 6. The bore 6 houses a cylindrical bag 7. The cylindrical bag 7 is filled with a static breaker slurry 8.
In this embodiment, the short distance blocking layer 1 is the range of the support and the rock within the length range of the anchor rod 4, the intermediate distance transition flexible layer 2 is the range of the support and the rock within 1m greater than the short distance blocking layer 1, and the long distance blocking layer is the range of the support and the rock within the length range of the anchor cable 5. In the construction of supporting a tunneling roadway, three support layers with progressive relation are formed on surrounding rocks around the roadway through a short-distance blocking layer 1, a middle-distance transition flexible layer 2 and a long-distance continuous layer 3 which are applied in multiple steps and layers, the distribution state of stress of the surrounding rocks around the roadway can be changed, the stress concentration area and the peak value of the stress of the surrounding rocks around the roadway are transferred to the long-distance continuous layer 3, the stress propagation in the deep part of the surrounding rocks of the roadway is effectively blocked, and the stability of the surrounding rocks of the deep roadway is kept. Through the medium-distance transition soft layer 2, the stress of the surrounding rock of the deep roadway can be effectively controlled, and the deformation of the short-distance blocking layer 1 and the deformation of the long-distance continuous layer 3 are coordinated. The short-distance blocking layer 1 formed by the anchor 4 and the support and the rock within the length range of the anchor 4 is used as a first layer for reinforcing support. And a long-distance continuous layer 3 formed by the anchor cable 5, supports within the length range of the anchor cable 5 and rocks is used as a third layer of reinforcing support. By drilling 6 the installation of the cylindrical bag 7 is facilitated. The support and reinforcement of the short-distance blocking layer 1 and the middle-distance transition soft layer 2 are facilitated by the cylindrical bag 7 filled with the static crushing agent slurry 8. The supporting levels of three progressive relations formed by the roadway supporting structure can change the distribution state of roadway surrounding rock stress, and transfer the concentrated region and the peak value of the roadway surrounding rock stress to the longer-distance continuous layer 3, effectively obstruct the propagation of deep ground stress, keep the stability of deep roadway surrounding rock, effectively control the deep roadway, and coordinate the deformation of the short-distance blocking layer 1 and the long-distance continuous layer 3. Meanwhile, the roadway supporting structure is wide in application range, is suitable for newly tunneling roadways and repairing roadways, and is particularly suitable for deep rock roadway engineering.
The thickness of the short-range blocking layer 1 is 2.5 to 3.0 m. The thickness of the middle-distance transition flexible layer 2 is 0.5-1 m. The thickness of the remote continuous layer 3 is 4-5 m.
In this embodiment, the thickness of the short-distance blocking layer 1 is 2.5-3.0m, the thickness of the middle-distance transition layer 2 is 0.5-1m, and the thickness of the long-distance continuous layer 3 is 4-5m, so as to ensure the stability of each supporting layer.
The diameter of the drill hole 6 is 28-32mm, the depth of the drill hole 6 is 3-4m, and the row spacing between the drill holes 6 is 2.0 m.
In the embodiment, the diameter of the drill hole 6 is 28-32mm, the depth of the drill hole 6 is 3-4m, and the row spacing between the drill hole 6 and the drill hole 6 is 2.0m, so that the support and reinforcement effects on the short-distance blocking layer 1 and the long-distance transition flexible layer 2 after the cylindrical bag 7 filled with the static crushing agent slurry 8 is placed in the drill hole 6 are ensured.
The diameter of the cylindrical bag 7 is smaller than that of the drilled hole 6, and the length of the cylindrical bag 7 is 0.5m-1.0 m.
In this embodiment, the diameter of the cylindrical bag 7 is smaller than the diameter of the bore 6, facilitating the operation of placing the cylindrical bag 7 into the bottom of the bore 6.
Both ends of the cylindrical bag 7 are integrally formed with truncated cone-shaped barbs 9.
In this embodiment, the cylindrical bag 7 placed in the bore 6 is facilitated to be prevented from sliding out of the bore 6 by the truncated cone-shaped barbs 9.
The cylindrical bag 7 is made of a nylon casing film.
In this embodiment, the cylindrical casing 7 is made of a nylon casing film, so as to ensure the reinforcing effect of the static breaker slurry 8 filled in the cylindrical casing 7 on the short-distance blocking layer 1 and the middle-distance transition flexible layer 2.
Example 2: a method of constructing a roadway support structure, as shown in fig. 3, includes the steps of:
and S1, constructing the short-distance blocking layer 1, and performing the processes of guniting, anchoring rods 4 and grouting support on surrounding rocks around the roadway in the roadway according to the field roadway support scheme to finish the construction of the short-distance blocking layer 1.
S2, constructing the long-distance continuous layer 3, constructing anchor cables 5 and grouting supports in the deep surrounding rock around the roadway, completing construction of the long-distance continuous layer 3, and forming the intermediate-distance transition flexible layer 2 between the long-distance continuous layer 3 and the short-distance blocking layer 1.
And S3, drilling the drill holes 6, namely drilling a plurality of drill holes 6 in different directions of the roadway section, wherein the depth of each drill hole 6 is 3-4m, the diameter of each drill hole 6 is 28-32mm, and the row spacing between the drill holes 6 is 2 m.
S4, filling the cylindrical bag 7, and filling the mixed static crushing agent slurry 8 into the cylindrical bag 7 with the length of 0.5-1m, wherein the diameter of the cylindrical bag 7 is smaller than that of the drilled hole 6 drilled in the step S3.
S5, sealing the cylindrical bag 7 filled with the static breaker slurry 8 in the step S4, then feeding the sealed cylindrical bag 7 to the bottom of the borehole 6, and filling the borehole 6 with cement slurry by injecting the cement slurry into the borehole 6.
The thickness of the short-range blocking layer 1 in step S1 is 2.5-3 m. The thickness of the intermediate-distance transition flexible layer 2 in step S2 is 0.5 to 1m, and the thickness of the long-distance continuous layer 3 is 4 to 5 m.
In step S4, the cylindrical bag 7 is made of a nylon casing film, and the two ends of the cylindrical bag 7 are integrally formed with truncated cone-shaped barbs 9 for preventing the cylindrical bag 7 from sliding out of the drilled hole 6.
In the process of drilling the bore 6 in step S3, 8 bores 6 are drilled in 8 different directions of the roadway cross section.
The working principle is as follows: in the construction of supporting a tunneling roadway, three support layers with progressive relation are formed on surrounding rocks around the roadway through a short-distance blocking layer 1, a middle-distance transition flexible layer 2 and a long-distance continuous layer 3 which are applied in multiple steps and layers, the distribution state of stress of the surrounding rocks around the roadway can be changed, the stress concentration area and the peak value of the stress of the surrounding rocks around the roadway are transferred to the long-distance continuous layer 3, the stress propagation in the deep part of the surrounding rocks of the roadway is effectively blocked, and the stability of the surrounding rocks of the deep roadway is kept. Through the medium-distance transition soft layer 2, the stress of the surrounding rock of the deep roadway can be effectively controlled, and the deformation of the short-distance blocking layer 1 and the deformation of the long-distance continuous layer 3 are coordinated. The short-distance blocking layer 1 formed by the anchor 4 and the support and the rock within the length range of the anchor 4 is used as a first layer for reinforcing support. And a long-distance continuous layer 3 formed by the anchor cable 5, supports within the length range of the anchor cable 5 and rocks is used as a third layer of reinforcing support. By drilling 6 the installation of the cylindrical bag 7 is facilitated. The support and reinforcement of the short-distance blocking layer 1 and the middle-distance transition soft layer 2 are facilitated by the cylindrical bag 7 filled with the static crushing agent slurry 8. The supporting levels of three progressive relations formed by the roadway supporting structure can change the distribution state of roadway surrounding rock stress, and transfer the concentrated region and the peak value of the roadway surrounding rock stress to the longer-distance continuous layer 3, effectively obstruct the propagation of deep ground stress, keep the stability of deep roadway surrounding rock, effectively control the deep roadway, and coordinate the deformation of the short-distance blocking layer 1 and the long-distance continuous layer 3. Meanwhile, the roadway supporting structure is wide in application range, is suitable for newly tunneling roadways and repairing roadways, and is particularly suitable for deep rock roadway engineering.
The construction method of the roadway supporting structure is simple, easy to implement, good in supporting effect on surrounding rocks around the roadway, and wide in popularization and application value.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a roadway support structure which characterized by: the tunnel rock breaking device comprises a short-distance blocking layer (1), a medium-distance transition flexible layer (2) and a long-distance continuous layer (3), wherein the short-distance blocking layer (1) is sequentially progressive from a tunnel wall to the depth of surrounding rocks around a tunnel, and a plurality of anchor rods (4) are arranged in the short-distance blocking layer (1); a plurality of anchor cables (5) are arranged in the long-distance continuous layer (3), and the end parts of the anchor cables (5) are positioned at the farthest position of the long-distance continuous layer (3) after passing through the short-distance blocking layer (1) and the middle-distance transition flexible layer (2) from the tunnel wall; the intermediate-distance transition flexible layer (2) is positioned between the short-distance blocking layer (1) and the long-distance continuous layer (3), and the distance between the edge of the intermediate-distance transition flexible layer (2) close to the long-distance continuous layer (3) and the edge of the short-distance blocking layer (1) is 1 m; the section of the roadway is provided with a plurality of drill holes (6); the drilling hole (6) is provided with a cylindrical bag (7); the cylindrical bag (7) is internally provided with static breaking agent slurry (8).
2. A roadway support structure as claimed in claim 1, wherein: the thickness of the short-distance blocking layer (1) is 2.5-3.0 m; the thickness of the intermediate-distance transition flexible layer (2) is 0.5-1 m; the thickness of the remote continuous layer (3) is 4-5 m.
3. A roadway support structure as claimed in claim 1, wherein: the diameter of the drill hole (6) is 28-32mm, the depth of the drill hole (6) is 3-4m, and the row spacing between the drill hole (6) and the drill hole (6) is 2.0 m.
4. A roadway support structure as claimed in claim 1, wherein: the diameter of the cylindrical bag (7) is smaller than that of the drill hole (6), and the length of the cylindrical bag (7) is 0.5-1.0 m.
5. A roadway support structure as claimed in claim 1, wherein: the two end parts of the cylindrical bag (7) are provided with round platform type barbs (9).
6. A roadway support structure as claimed in claim 1, wherein: the cylindrical bag (7) is made of a nylon casing film.
7. A construction method of a roadway supporting structure is characterized by comprising the following steps: the method comprises the following steps:
s1, constructing the short-distance blocking layer (1), and performing the processes of guniting, anchoring rods (4) and grouting support on surrounding rocks around the roadway in the roadway according to the on-site roadway support scheme to finish the construction of the short-distance blocking layer (1);
s2, constructing a long-distance continuous layer (3), constructing anchor cables (5) and grouting supports in the deep surrounding rock around the roadway to complete construction of the long-distance continuous layer (3), wherein a middle-distance transition flexible layer (2) is arranged between the long-distance continuous layer (3) and the short-distance blocking layer (1);
s3, drilling holes (6), drilling a plurality of drill holes (6) in different directions of the cross section of the roadway, wherein the depth of each drill hole (6) is 3-4m, the diameter of each drill hole (6) is 28-32mm, and the row spacing between the drill holes (6) is 2 m;
s4, filling a cylindrical bag (7), and filling the mixed static crushing agent slurry (8) into the cylindrical bag (7) with the length of 0.5-1m, wherein the diameter of the cylindrical bag (7) is smaller than that of the drilled hole (6) drilled in the step S3;
s5, sealing the cylindrical bag (7) filled with the static breaker slurry (8) in the step S4, then feeding the sealed cylindrical bag (7) to the bottom of the drill hole (6), and filling the drill hole (6) with cement slurry by injecting the drill hole (6).
8. The method of constructing a roadway support structure as claimed in claim 7, wherein: the thickness of the short-distance blocking layer (1) in the step S1 is 2.5-3 m; the thickness of the intermediate-distance transition flexible layer (2) in the step S2 is 0.5-1m, and the thickness of the long-distance continuous layer (3) is 4-5 m.
9. The method of constructing a roadway support structure as claimed in claim 7, wherein: the cylindrical bag (7) in the step S4 is made of a nylon casing film material, and two ends of the cylindrical bag (7) are provided with truncated cone-shaped barbs (9) for preventing the cylindrical bag (7) from sliding out of the drill holes (6).
10. The method of constructing a roadway support structure as claimed in claim 7, wherein: in the process of drilling holes (6) in the step S3, 8 drilled holes (6) are respectively drilled in 8 different directions of the section of the roadway.
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| CN202010958998.1A CN111963210A (en) | 2020-09-14 | 2020-09-14 | Roadway supporting structure and construction method thereof |
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| CN202010958998.1A CN111963210A (en) | 2020-09-14 | 2020-09-14 | Roadway supporting structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115508548A (en) * | 2022-11-22 | 2022-12-23 | 山东科技大学 | Method and system for determining supporting structure combining stress environment and surrounding rock structure |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115508548A (en) * | 2022-11-22 | 2022-12-23 | 山东科技大学 | Method and system for determining supporting structure combining stress environment and surrounding rock structure |
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