CN112696208A - Supporting method for soft rock roadway - Google Patents
Supporting method for soft rock roadway Download PDFInfo
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- CN112696208A CN112696208A CN202011539713.7A CN202011539713A CN112696208A CN 112696208 A CN112696208 A CN 112696208A CN 202011539713 A CN202011539713 A CN 202011539713A CN 112696208 A CN112696208 A CN 112696208A
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- 239000011435 rock Substances 0.000 title claims abstract description 107
- 230000008093 supporting effect Effects 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 238000004458 analytical method Methods 0.000 claims abstract description 20
- 239000011378 shotcrete Substances 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000004088 simulation Methods 0.000 claims description 11
- 238000009412 basement excavation Methods 0.000 claims description 9
- 230000005641 tunneling Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005457 optimization Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000000835 fiber Substances 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK 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 OR ROCK 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention provides a supporting method of a soft rock roadway, and belongs to the technical field of roadway supporting. The method comprises the following steps: establishing model analysis by using numerical simulation software, carrying out real-time monitoring of the deep displacement of the surrounding rock of the roadway and analysis of the loosening circle of the deep displacement, and analyzing the stress distribution and the convergence displacement of two sides of the asymmetric surrounding rock roadway; the support technology of two-digging two-anchor net one-spraying steel belt based on the support principle of giving first and resisting later is utilized to carry out subarea support on the high stress area and the low stress area. The supporting process comprises short anchor rods, long anchor rods, primary anchor nets, secondary anchor nets, double-layer reinforcing steel bars, sprayed concrete and the like. By adopting the supporting method for supporting, the stress distribution of the two sides of the surrounding rock can be ensured to be the same, the asymmetrical deformation of the roadway is avoided, the supporting strength and efficiency are greatly improved, and the repair times of the roadway are effectively reduced.
Description
Technical Field
The invention relates to the technical field of roadway surrounding rock supporting, in particular to a supporting method of a soft rock roadway.
Background
A roadway is a passageway excavated for mining lifting, transportation, ventilation, drainage, power supply, etc. in underground mining. The section shape of the tunnel is mostly arch, trapezoid or rectangle. Soft rock refers to loose, soft, weak rock formations that have low strength, large porosity, poor cementation, significant cutting and weathering effects from the formation, or contain large amounts of expansive minerals. Roadways excavated in soft rock are called soft rock roadways. The soft rock roadway has the characteristics of large deformation, high pressure and difficult support.
The soft rock is a loose, scattered, soft and weak rock stratum which has low strength, large porosity, poor cementation degree, obvious influence by cutting and weathering of a structural surface or contains a large amount of easily expandable clay minerals. In the deep bottom layer, the surrounding rock is in a high stress environment, and due to the fact that the strength of the soft rock is low, the uniaxial saturated compressive strength is also low, and the deformation and the damage of the surrounding rock are very strong, the problems that the deformation speed of the surrounding rock is high, the deformation amount is large, and the duration is long exist in the deep soft rock roadway. Along with the gradual increase of mining depth, surrounding rocks emerge endlessly in the condition that soft rocks have poor lithology, the construction blasting of a roadway is difficult, the management and the supporting of a top plate are complex, and meanwhile, pressure is brought to safety production, so that the supporting technology of the roadway for soft breaking of the surrounding rocks needs to be researched.
The current soft broken surrounding rock roadway support technology is mainly divided into three types, the first type is a combined support mode of adding a steel wire mesh to a pipe seam anchor rod and using concrete to perform spray layer reinforcement; the second is a combined supporting mode of adding a wire mesh to the anchor rod of the quick-hardening cement cartridge and using concrete to perform sprayed layer reinforcement; the third is the combined support combining the I-steel bracket and the log. The above technology has several problems, firstly, the anchor rod strength is small, the pipe seam anchor rod only has a drawing force of 20-40 kN, the quick cement explosive roll anchor rod also only has a drawing force of 70-80 kN, and if the anchor rod meets a large low pressure or the surrounding rock of the roadway is unstable, the roadway is deformed finally because the resistance of the anchor rod is difficult to resist the deformation pressure of the surrounding rock in the roadway with large ground pressure and unstable surrounding rock; secondly, the supporting form is too simple, a mutually coordinated whole is difficult to form, the supporting effect is not ideal, and the supporting structure cannot meet the asymmetry of deformation and damage of the roadway, so that the cross section of the roadway is partially over-supported and partially weakly supported; and thirdly, less sprayed concrete, too thin sprayed layer and poor quality. At present, an innovative soft broken surrounding rock roadway support technology and method are urgently needed.
Disclosure of Invention
The invention provides a supporting method of a soft rock roadway, aiming at the problems that the construction blasting of the roadway is difficult and the management and supporting of a top plate are complicated in the existing supporting method of the soft rock roadway.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
a supporting method of a soft rock roadway comprises the following steps:
s4: under the condition that the soft rock roadway is determined to be asymmetrically damaged, determining a support key part site of the soft rock roadway, and determining a first support strategy;
s5: selecting a supporting tool according to the first supporting strategy, wherein the supporting tool at least comprises a first supporting component and a second supporting component;
s6: after the supporting tool is used for completing the first supporting strategy, simulating and optimizing the performance of the soft rock roadway to obtain a second analysis result;
s7: and determining a second support strategy according to the second analysis result so as to complete the support.
Optionally, in the case that the soft rock roadway is determined to be asymmetrically damaged, determining a support key part site of the soft rock roadway, and before determining the first support strategy, the support method further includes:
s1: carrying out excavation simulation according to the tunnel section parameters of the soft rock tunnel;
s2: analyzing the performance of the roadway section by using the excavation simulation data to obtain a first analysis result, wherein the first analysis at least comprises a displacement settlement value, a stress value and a plastic zone range;
s3: and judging whether the soft rock roadway is asymmetrically damaged or not according to the first analysis result.
Optionally, the soft rock roadway at least includes an upper crown angle area and a lower crown bottom area.
Optionally, the first support policy includes: the soft rock roadway further comprises a middle area located in the upper crown angle area and the lower pan bottom assisting area, and the middle area is provided with a plurality of monitors for monitoring and recording the stress value of the soft rock roadway.
Optionally, the first support component includes: long stock, short stock and first anchor net.
Optionally, the second support assembly includes: the second anchor net, the roof double-layer steel bars, the two sides of double-layer steel bars and the sprayed concrete.
Optionally, the simulating and optimizing the performance of the soft rock roadway includes: monitoring deep displacement of the soft rock roadway and/or analyzing a loosening zone of the soft rock roadway.
Optionally, the bracing tool comprises a long anchor rod, and the second bracing strategy comprises: and carrying out encrypted support on the key part site by using the long anchor rod.
Optionally, the soft rock tunnel still includes except other positions beyond the key site point, it includes short stock to strut the instrument, the strategy is strutted to the second still includes: and using the short anchor rods to support other parts.
Optionally, after the supporting tool is selected according to the first supporting strategy, the supporting method includes the following supporting steps:
s601: supporting the first layer of anchor net twice according to the two-time tunneling footage results; wherein, the two-time support comprises a first support and a second support;
s602: after the second supporting is carried out, double-layer steel bars are added to the second layer of anchor net to carry out third supporting;
s603: and spraying concrete on the second supporting assembly.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
in the scheme, the high-strength resin anchor rod is used, the anchoring force can reach 135kN, and the high-strength resin anchor rod can resist the pressure of larger surrounding rock deformation and avoid roadway deformation; surrounding rocks in X, Y, Z three directions of the roadway are reinforced by using anchor rods, anchor nets and double-layer steel bars, so that the supporting structure forms a whole, and the integral stability of the surrounding rocks of the roadway is greatly enhanced; the support time of pressure relief, pressure relief and pressurization of surrounding rock under mining induced stress is discovered, and the support means and the construction time sequence of a resin anchor rod, a reinforcing mesh, sprayed concrete, a steel arch frame and the like are optimized and combined by adopting the principle of yielding first and resisting second; the sprayed concrete is 35kg/m3 steel fiber sprayed concrete, the strength of the steel fiber sprayed concrete is high, the rib spalling and roof caving can be reduced, the construction labor intensity is low, and the construction speed is favorably improved. The invention can effectively improve the support strength, reduce the times of repairing the tunnel, and is suitable for the soft broken tunnel excavation support of the mine.
Drawings
Fig. 1 is a schematic cross-sectional view of a supporting roadway of the supporting method of a soft rock roadway of the present invention;
fig. 2 is a schematic view of a supporting roadway trend plane of the supporting method of a soft rock roadway of the present invention;
fig. 3 is a schematic view of a top plate double-layer steel bar structure of the supporting method of the soft rock roadway of the invention;
fig. 4 is a schematic view of a structure of reinforcing steel bars on two sides of a top plate in the supporting method of the soft rock roadway.
[ main component symbol description ]
In the figure: 1. short anchor rods; 2. a long anchor rod; 3. a layer of anchor rods; 4. two layers of anchor nets; 5. a roof double-layer steel bar; 6. two sides of double-layer steel bars; 7. and (5) spraying concrete.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a supporting method of a soft rock roadway, aiming at the problems of difficult construction blasting of the roadway, complex top plate management and supporting and the like of the existing supporting method of the soft rock roadway.
A supporting method of a soft rock roadway comprises the following steps:
s4: under the condition that the soft rock roadway is determined to be asymmetrically damaged, determining a support key part site of the soft rock roadway, and determining a first support strategy;
s5: selecting a supporting tool according to the first supporting strategy, wherein the supporting tool at least comprises a first supporting component and a second supporting component;
s6: after the supporting tool is used for completing the first supporting strategy, simulating and optimizing the performance of the soft rock roadway to obtain a second analysis result;
s7: and determining a second support strategy according to the second analysis result so as to complete the support.
As shown in fig. 3 and 4, the roadway section adopts a 2.8m × 2.6m three-center arch design, and the arch height is 100 cm.
Optionally, before determining a support key part site of the soft rock roadway and determining a first support strategy in the case that the soft rock roadway is determined to be asymmetrically damaged, the support method further includes:
s1: carrying out excavation simulation according to the tunnel section parameters of the soft rock tunnel; the excavation simulation can be performed by establishing roadway section parameters by using FLAC3D numerical simulation software, and one skilled in the art can select other modeling software different from FLAC3D numerical simulation software to perform simulation according to the embodiment of the invention.
S2: analyzing the performance of the roadway section by using the excavation simulation data to obtain a first analysis result, wherein the first analysis at least comprises a displacement settlement value, a stress value and a plastic zone range; according to the specific implementation provided by the embodiment of the invention, after simulation analysis, the following data can be obtained: the maximum sinking amount of the top plate is 9.3 mm; the ascending displacement of the bottom plate is 6.7 mm; the maximum moving-in amount of the two sides is 3.8mm, the top plate and the bottom plate of the roadway are in a tension state, and the tensile stress is 0.35 MPa; the lateral wall rock mass is in a compression state, and the compression stress is 25.0 MPa.
Optionally, the soft rock roadway comprises at least an upper crown angle area and a lower crown bottom area.
S3: and judging whether the soft rock roadway is asymmetrically damaged or not according to the first analysis result. Therefore, by combining the analysis data and the specific situation of the soft rock roadway, the following results can be obtained: the roadway surrounding rock is subjected to asymmetric damage in space, bottom heave damage in a lower disc side bottom area and shearing damage in an upper disc arch angle area, and thus the lower disc side bottom area and the upper disc arch angle area are determined to be key supporting part sites.
Further, optionally, the first support strategy comprises: the soft rock roadway further comprises a middle area which is located in the upper crown angle area and the lower wall bottom area, wherein the middle area is provided with a plurality of monitors for monitoring and recording the stress value of the soft rock roadway and monitoring and analyzing four performance characteristics of the soft rock roadway ground pressure activity in real time, and the four performance characteristics comprise the internal displacement of the surrounding rock of the soft rock roadway, the roadway convergence deformation, the internal stress of the surrounding rock and the surrounding rock pressure change process.
As shown in fig. 1 and 2, the first sheathing assembly includes: long anchor rods 1, short anchor rods 2 and a first anchor net 3. In addition, the second support assembly includes: the second anchor net 4, the roof double-layer steel bars 5, the two-side double-layer steel bars 6 and the sprayed concrete 7 adopt the principle of yielding first and then resisting, and effective regulation and control of surrounding rock pressure relief, yielding and pressurizing support under mining stress are realized.
Optionally, the simulation optimizing and calculating the performance of the soft rock roadway comprises: monitoring deep displacement of the soft rock roadway and/or analyzing a loosening zone of the soft rock roadway. For example, in primary anchor net supporting, deep displacement monitoring and loosening circle analysis of surrounding rocks of a roadway are carried out, supporting scheme simulation optimization calculation is carried out, stress distribution and convergence displacement of two sides of the asymmetric surrounding rock roadway are analyzed, long anchor rods 2 are particularly used for encrypted supporting in a bottom area of a lower wall side and an upper wall arch corner area, short anchor rods 1 are used for supporting in a low-stress area and a smaller convergence displacement area, and therefore asymmetric supporting of the roadway is formed.
In addition, in the specific implementation mode provided by the embodiment of the invention, the short anchor rod 1 adopts
A specification of drill bit anchor; long anchor rod 2 adopts
The screw thread of the twist type high-strength resin anchor rod adopts HRB235 round steel for right-handed anchor rod material, and the anchor rodThe head adopts a Z-shaped structure; each anchor rod adopts 3 bolts
And (3) anchoring the resin cartridge, wherein the gel time is 26-40 seconds. The anchoring force of the resin anchor rod can reach 130 KN. The length and width of the anchor net are 6000mm and 2000mm, and the size of the grid is 80mm and 80 mm.
The double-layer steel bar 5 of the top plate and the double-layer steel bar 6 of the two sides are adopted
The deformed steel bar is internally provided with a plurality of rectangular reinforcing steel bar holes with the length multiplied by the width of 150 multiplied by 100mm, and the reinforcing steel bar holes at two ends are in the shape of semi-circular ellipse. The double-layer steel bars 5 on the top plate are arranged along the direction of the section of the roadway, and the double-layer steel bars 6 on the two sides are arranged along the direction of the trend of the roadway. The number of the steel bar holes in the double-layer steel bar 5 of the top plate is 7, and the spacing between the support rows is 1300 mm; the number of the steel bar holes in the double-layer steel bars 6 at the two sides is 5, and the length is 4000 mm.
In the secondary steel bar anchor net sprayed concrete support, the anchor rod penetrates through the steel bar hole to support the two layers of anchor nets 4, the top plate double-layer steel bars 5 and the two sides of double-layer steel bars 6. Wherein, the double-layer steel bars 6 of the two sides are supported in the bottom area of the lower disk side and the angle area of the upper disk arch to form an asymmetric support.
In the secondary steel bar anchor net sprayed concrete support, the sprayed concrete 6 is supported by steel fiber sprayed concrete with the steel fiber parameter of 35kg/m3, and the thickness of the sprayed concrete is 50 mm.
Optionally, the bracing tool comprises a long bolt, the second bracing strategy comprising: and carrying out encrypted support on the key part site by using the long anchor rod.
Optionally, the soft rock roadway further includes other parts except the key site points, the support tool includes a short anchor rod, the second support strategy further includes: and using the short anchor rods to support other parts.
Optionally, after the supporting tool is selected according to the first supporting strategy, the supporting method comprises the following supporting steps:
s601: supporting the first layer of anchor net twice according to the two-time tunneling footage results; wherein, the two-time support comprises a first support and a second support;
s602: after the second supporting, adding double-layer steel bars to the second layer of anchor net
For the third support;
s603: and spraying concrete on the second supporting assembly.
Specifically, the supporting process of 'two-digging two-anchor net one-spraying steel belt' is adopted for supporting, and comprises the following steps:
1) after the first tunneling footage is finished and slag is discharged, the first layer of anchor net supporting work of the footage is carried out, and the tunneling is continued for the second time.
2) And after the second tunneling footage is completed and slag is discharged, carrying out the first-layer anchor net supporting work of the current footage.
3) And carrying out the second-layer anchor net and double-layer steel bar supporting work of the previous two tunneling footings.
4) And performing concrete spraying work of the tunneling footage twice.
In the scheme, the high-strength resin anchor rod is used, the anchoring force can reach 135kN, and the high-strength resin anchor rod can resist the pressure of larger surrounding rock deformation and avoid roadway deformation; surrounding rocks in X, Y, Z three directions of the roadway are reinforced by using anchor rods, anchor nets and double-layer steel bars, so that the supporting structure forms a whole, and the integral stability of the surrounding rocks of the roadway is greatly enhanced; the support time of pressure relief, pressure relief and pressurization of surrounding rock under mining induced stress is discovered, and the support means and the construction time sequence of a resin anchor rod, a reinforcing mesh, sprayed concrete, a steel arch frame and the like are optimized and combined by adopting the principle of yielding first and resisting second; the sprayed concrete is 35kg/m3 steel fiber sprayed concrete, the strength of the steel fiber sprayed concrete is high, the rib spalling and roof caving can be reduced, the construction labor intensity is low, and the construction speed is favorably improved. The invention can effectively improve the support strength, reduce the times of repairing the tunnel, and is suitable for the soft broken tunnel excavation support of the mine.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A supporting method of a soft rock roadway is characterized by comprising the following steps:
s4: under the condition that the soft rock roadway is determined to be asymmetrically damaged, determining a support key part site of the soft rock roadway, and determining a first support strategy;
s5: selecting a supporting tool according to the first supporting strategy, wherein the supporting tool at least comprises a first supporting component and a second supporting component;
s6: after the supporting tool is used for completing the first supporting strategy, simulating and optimizing the performance of the soft rock roadway to obtain a second analysis result;
s7: and determining a second support strategy according to the second analysis result so as to complete the support.
2. The soft rock roadway support method of claim 1, wherein in the case where the soft rock roadway is determined to be asymmetrically damaged, determining a support critical site thereof, and before determining the first support strategy, the support method further comprises:
s1: carrying out excavation simulation according to the tunnel section parameters of the soft rock tunnel;
s2: analyzing the performance of the roadway section by using the excavation simulation data to obtain a first analysis result, wherein the first analysis at least comprises a displacement settlement value, a stress value and a plastic zone range;
s3: and judging whether the soft rock roadway is asymmetrically damaged or not according to the first analysis result.
3. The soft rock roadway support method according to claim 1,
the soft rock roadway at least comprises an upper disk arch angle area and a lower disk bottom area.
4. The soft rock roadway support method of claim 3, wherein the first support strategy comprises:
the soft rock roadway further comprises a middle area located in the upper crown angle area and the lower pan bottom assisting area, and the middle area is provided with a plurality of monitors for monitoring and recording the stress value of the soft rock roadway.
5. The soft rock roadway support method according to claim 1,
the first support assembly includes: long stock, short stock and first anchor net.
6. The soft rock roadway support method according to claim 1,
the second support assembly includes: the second anchor net, the roof double-layer steel bars, the two sides of double-layer steel bars and the sprayed concrete.
7. The soft rock roadway support method of claim 1, wherein the simulating optimization calculation of the performance of the soft rock roadway comprises:
monitoring deep displacement of the soft rock roadway and/or analyzing a loosening zone of the soft rock roadway.
8. The method of claim 1, wherein the support tool comprises a long bolt, and the second support strategy comprises:
and carrying out encrypted support on the key part site by using the long anchor rod.
9. The soft rock roadway support method according to claim 1, characterized in that: soft rock tunnel still include except other positions beyond the key site point, it includes short stock to strut the instrument, the strategy is strutted to the second still includes:
and using the short anchor rods to support other parts.
10. A method of bolting a soft rock roadway according to any one of claims 1-9, wherein after said selection of bolting tools according to said first bolting strategy, said method has the following bolting steps:
s601: supporting the first layer of anchor net twice according to the two-time tunneling footage results; wherein, the two-time support comprises a first support and a second support;
s602: after the second supporting is carried out, double-layer steel bars are added to the second layer of anchor net to carry out third supporting;
s603: and spraying concrete on the second supporting assembly.
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| CN202011539713.7A CN112696208B (en) | 2020-12-23 | 2020-12-23 | Supporting method of soft rock roadway |
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| CN202011539713.7A CN112696208B (en) | 2020-12-23 | 2020-12-23 | Supporting method of soft rock roadway |
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| CN112696208B CN112696208B (en) | 2023-04-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008127793A (en) * | 2006-11-17 | 2008-06-05 | Shimizu Corp | Support structure of adit |
| CN102140924A (en) * | 2011-02-09 | 2011-08-03 | 中国矿业大学 | Double-shell coupling supporting method of deep soft rock tunnel |
| CN104265322A (en) * | 2014-09-23 | 2015-01-07 | 山东科技大学 | Control method of asymmetric deformation of deep mine roadway surrounding rock |
| CN207261019U (en) * | 2017-07-30 | 2018-04-20 | 河南理工大学 | Deep Soft Rock Tunnel double-layer rubber gunite concrete sprinkler body supporting construction |
| CN109184747A (en) * | 2018-10-24 | 2019-01-11 | 中南大学 | A kind of method for protecting support of Deep Soft Rock Tunnel |
| CN211342952U (en) * | 2019-10-27 | 2020-08-25 | 西南交通大学 | Asymmetric supporting construction in stratiform soft rock tunnel |
| CN111677523A (en) * | 2020-05-21 | 2020-09-18 | 中铁六局集团有限公司工程设计院 | Asymmetric selective support method for tunnel with layered surrounding rock |
-
2020
- 2020-12-23 CN CN202011539713.7A patent/CN112696208B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008127793A (en) * | 2006-11-17 | 2008-06-05 | Shimizu Corp | Support structure of adit |
| CN102140924A (en) * | 2011-02-09 | 2011-08-03 | 中国矿业大学 | Double-shell coupling supporting method of deep soft rock tunnel |
| CN104265322A (en) * | 2014-09-23 | 2015-01-07 | 山东科技大学 | Control method of asymmetric deformation of deep mine roadway surrounding rock |
| CN207261019U (en) * | 2017-07-30 | 2018-04-20 | 河南理工大学 | Deep Soft Rock Tunnel double-layer rubber gunite concrete sprinkler body supporting construction |
| CN109184747A (en) * | 2018-10-24 | 2019-01-11 | 中南大学 | A kind of method for protecting support of Deep Soft Rock Tunnel |
| CN211342952U (en) * | 2019-10-27 | 2020-08-25 | 西南交通大学 | Asymmetric supporting construction in stratiform soft rock tunnel |
| CN111677523A (en) * | 2020-05-21 | 2020-09-18 | 中铁六局集团有限公司工程设计院 | Asymmetric selective support method for tunnel with layered surrounding rock |
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