CN218862645U - Supporting construction in deep soft rock tunnel - Google Patents
Supporting construction in deep soft rock tunnel Download PDFInfo
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- CN218862645U CN218862645U CN202223593622.9U CN202223593622U CN218862645U CN 218862645 U CN218862645 U CN 218862645U CN 202223593622 U CN202223593622 U CN 202223593622U CN 218862645 U CN218862645 U CN 218862645U
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- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 4
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- 239000002002 slurry Substances 0.000 abstract description 14
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Abstract
The application provides a supporting construction in soft rock tunnel in deep includes: the grouting anchor rods and/or the grouting anchor cables are at least arranged on the roadway top plate and the roadway side part; the grouting anchor rod and the grouting anchor cable are both of hollow or solid structures, and the outer wall of the grouting anchor rod and the grouting anchor cable is provided with a grouting hole; spraying a slurry layer; the grouting anchor cable and the grouting anchor rod are arranged on the inner wall surfaces of the roadway top plate and the roadway side part and used for sealing the surface of the roadway surrounding rock and the anchor holes and the peripheral sides of the grouting anchor cable and the grouting anchor rod; and pier stud support, it is at least for a set of setting be in between tunnel roof and the tunnel bottom plate, a set of pier stud support includes a plurality of edges tunnel extending direction and interval have distance the pier stud. The method can be used for controlling the large deformation of the surrounding rock of the roadway under complex conditions such as coal mine deep soft rock, dynamic pressure and the like, on one hand, the anchoring and grouting effects of the surrounding rock are obviously improved, on the other hand, the stress borne by the roadway is greatly reduced through the large-tonnage strong support of the pier stud, the deformation of the roadway is reduced, and the coupling and the cooperation of an active control method and a passive control method are realized.
Description
Technical Field
The application relates to the technical field of coal mining, in particular to a supporting structure of a deep soft rock roadway.
Background
With the gradual depletion of shallow coal resources, the mining depth of coal is extended downwards by 10-25m every year at present, the average mining depth of a deep mining area exceeds 800m, the strength of a coal bed is lower and generally does not exceed 10MPa due to main mudstone and sandy mudstone soft rock of a top plate and a bottom plate, the deep mining area belongs to a typical deep soft rock mining area, and the roadway has the characteristics of severe sinking of a top plate, severe extrusion of two sides and strong bulging of the bottom plate and peripheral deformation. Therefore, the large deformation of the roadway is the primary problem of safe, intelligent and efficient mining of the mine.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, the supporting structure of the deep soft rock roadway can be used for controlling large deformation of surrounding rocks of the roadway under complex conditions such as coal mine deep soft rock and dynamic pressure, on one hand, the anchoring strength of the surrounding rocks is remarkably improved, on the other hand, the stress borne by the roadway is greatly reduced through large-tonnage supporting of pier columns, the deformation amount of the roadway is reduced, and coupling and cooperation of a driving control method and a driven control method are achieved.
According to the application, a supporting construction in soft rock tunnel in deep includes:
the grouting anchor rods and/or the grouting anchor cables are at least arranged on the roadway top plate and the roadway side part; the grouting anchor rod and the grouting anchor cable are both of hollow or solid structures, and the outer wall of the grouting anchor rod and the grouting anchor cable is provided with a grouting hole;
a guniting layer; the grouting anchor cable and the grouting anchor rod are arranged on the inner wall surfaces of the roadway top plate and the roadway side part and used for sealing the surface of the roadway surrounding rock and the anchor holes and the peripheral sides of the grouting anchor cable and the grouting anchor rod; and
pier stud support frame, it is at least for a set of setting be in between tunnel roof and the tunnel bottom plate, a set of pier stud support frame includes a plurality of edges tunnel extending direction and interval have a distance the pier stud.
In some embodiments, a plurality of grouting anchor cables are arranged on the roadway floor.
In some embodiments, the inner ends of the grouting anchor rods and the grouting anchor cables are anchored in the surrounding rock of the roadway, and the outer ends of the grouting anchor rods and the grouting anchor cables are arranged on the inner wall of the roadway through anchor discs and nuts.
In some embodiments, the yield load of the body of the grouting anchor rod is not lower than 230kN, and the yield load of the cable body of the grouting anchor cable on the roadway top plate is not lower than 500kN; and the yield load of the grouting anchor cable body on the roadway side part and the roadway bottom plate is not lower than 400kN.
In some embodiments, the hole sealing structure of the grouting anchor rope and the grouting anchor rod is of a hole sealing device self-expansion type or a mechanical extrusion self-expansion type, and the pressure resistance pressure of the hole sealing structure is not lower than 15MPa.
In some embodiments, the guniting layer is formed by spraying guniting material, wherein the guniting material is one of concrete material, inorganic-organic composite material or organic polymer material; when the guniting material is a concrete material, the thickness of the guniting layer is not less than 5cm; when the guniting material is an inorganic-organic composite material or an organic high polymer material, the thickness of the guniting layer is not less than 5mm.
In some embodiments, the roadway roof is provided with a plurality of grouting bolts and grouting anchor cables; and the two ends of each grouting anchor cable in the width direction of the roadway are the grouting anchor rods.
In some embodiments, the roadway side part is provided with a plurality of grouting anchor rods and grouting anchor cables; the grouting anchor cables and the grouting anchor rods are alternately arranged at intervals in the height direction of the roadway.
In some embodiments, the pier column has a diameter of not less than 200mm, a maximum bearing capacity of not less than 5000kN and an axial displacement of up to 200mm without breaking; the pier stud comprises a pouring core and a constraint shell arranged outside the pouring core in a surrounding mode.
In some embodiments, the top of the pier stud is provided with an expansion part for enhancing the initial supporting capacity of the roadway roof.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a supporting structure of a deep soft rock roadway according to an embodiment of the present application;
fig. 2 is a schematic view of a supporting structure of a deep soft rock roadway according to another embodiment of the present application;
fig. 3 is a schematic view of the arrangement of pier studs according to an embodiment of the present application;
fig. 4 is a schematic view of a pier stud according to an embodiment of the present application;
in the figure, 1, a roadway roof; 2. a roadway floor; 3. a roadway side part; 4. grouting an anchor rod; 5. grouting an anchor cable; 6. pier studs; 7. pouring a core; 8. a constraining housing; 9. an expansion part; 10. and (5) spraying a slurry layer.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Reference will now be made in detail to examples of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The examples described below with reference to the drawings are illustrative and intended to be used for explaining the present application and are not to be construed as limiting the present application.
According to this application, a supporting construction in soft rock tunnel in deep is proposed, include as shown in fig. 1: a plurality of grouting anchor rods 4 and/or a plurality of grouting anchor cables 5 which are at least arranged on the roadway top plate 1 and the roadway side part 3; a guniting layer 10 and a pier stud support frame. The method comprises the steps that a roadway is a hollow corridor structure with certain width, height and extension length, the hollow corridor structure is arranged in roadway surrounding rocks and is provided with a roadway top plate 1, a roadway side part 3 and a roadway top plate 1, in the embodiment, a plurality of grouting anchor rods 4 and/or a plurality of grouting anchor cables 5 are/is arranged on the roadway top plate 1 and the roadway side part 3, namely, the method comprises the steps that a plurality of grouting anchor rods 4 or grouting anchor cables 5 are arranged on the roadway top plate 1, and meanwhile, a plurality of grouting anchor rods 4 or grouting anchor cables 5 are arranged on the roadway side part 3; or the tunnel roof 1 is provided with a plurality of grouting anchor cables 5 and grouting anchor rods 4, and the tunnel side part 3 is provided with a plurality of grouting anchor cables 5 and grouting anchor rods 4. The grouting anchor rod 4 and the grouting anchor cable 5 are used for injecting grouting slurry into cracks of surrounding rocks of the roadway to form reinforcement on the outer side of the roadway, the inner ends of the grouting anchor rod 4 and the grouting anchor cable 5 are anchored in the surrounding rocks of the roadway, the outer ends of the grouting anchor rod 4 and the grouting anchor cable 5 are arranged on the inner wall of the roadway through anchor discs and nuts, the grouting anchor rod 4 and the grouting anchor cable 5 are both of hollow or solid structures, grouting holes are formed in the outer wall of the grouting anchor rod and used for grouting, and the grouting slurry is extruded into the internal cracks of the surrounding rocks of the roadway under high pressure.
The grouting slurry adopts a strong-bonding nano modified inorganic-organic composite material, the particle size D90 of the composite material is not higher than 10 mu m, the bonding strength with coal is not lower than 1.5MPa, the bonding strength with rocks is not lower than 3.0MPa, the compressive strength of the composite material under a pure slurry condition is not lower than 30MPa after 28D, the strong-bonding nano modified inorganic-organic composite material can be formed by mixing U.P-I superfine cement and an organic modifier (amphiphilic polycarboxylic acid and the like), the grouting slurry is characterized in that the particle size D90 is lower than 10 mu m compared with a common inorganic material and is one fifth of the particle size of a common 425# cement grouting material, and the compressive strength and the bonding strength of the grouting slurry are more than 2 times of those of the common 425# cement grouting material, particularly the bonding strength with coal is improved by more than 3 times
After the construction space with the high-pressure pre-stressed anchor grouting is available, a pneumatic or hydraulic high-pressure grouting pump is used for grouting, the grouting slurry in the embodiment adopts a strong-adhesion nano modified inorganic-organic composite grouting material, the particle size D90 of the composite material is not higher than 10 mu m, the adhesion strength with coal is not lower than 1.5MPa, the adhesion strength with rock is not lower than 3.0MPa, and the 28D compressive strength of the composite material is not lower than 30MPa under the net slurry condition, so that the high-pressure pre-stressed anchor grouting is realized.
A guniting layer 10; the grouting anchor is arranged on the inner wall surfaces of a roadway top plate 1 and a roadway side part 3 and is used for sealing the surface of the roadway surrounding rock and the anchor holes and the peripheral sides of a grouting anchor rope 5 and a grouting anchor rod 4 so as to prevent slurry leakage during grouting; pier stud support frame is at least for a set of setting between tunnel roof 1 and tunnel bottom plate 2, and a set of pier stud support frame includes that a plurality of along tunnel extending direction and interval have the pier stud 6 of distance as shown in fig. 3.
In one aspect of the embodiment, during or after tunneling, a high-strength grouting anchor rod 4 and/or a grouting anchor cable 5 are/is adopted for high-pressure full-length prestressed anchorage, so that the anchoring force of the grouting anchor rod 4 and the grouting anchor cable 5 is improved, and the high-prestress active support effect is fully exerted; meanwhile, the grouting slurry is squeezed into the internal micro cracks of the surrounding rocks of the roadway under high pressure, so that the strength of the surrounding rocks of the roadway is improved, and the integrity of the surrounding rocks of the roadway is improved; in another aspect of this embodiment, in the extending direction of the roadway before the stoping of the coal face, a plurality of pier studs 6 are arranged between the top and bottom plates at certain intervals for strongly supporting the roadway top plate 1, so as to reduce the extrusion of the roadway top plate 1 on the roadway side part 3. Therefore, the active supporting function of the grouting anchor rod 4 and the grouting anchor cable 5 and the passive supporting function of the pier stud 6 are cooperatively coupled to jointly support the deep soft rock roadway, so that the deep soft rock roadway surrounding rock is prevented from being greatly deformed.
In some embodiments, a plurality of grouting anchor lines 5 are arranged on the roadway floor 2.
Wherein, set up a plurality of slip casting anchor ropes 5 on tunnel bottom plate 2 as shown in fig. 2 for further consolidate the tunnel country rock in the tunnel bottom plate 2 outside, prevent deep soft rock tunnel country rock big deformation. For example, as shown in fig. 2, firstly, during or after the tunneling, the high-strength grouting anchor cable 5 and the grouting anchor rod 4 are constructed on the roadway top plate 1, the roadway side part 3 and the roadway bottom plate 2, wherein the grouting anchor cable 5 and the grouting anchor rod 4 are constructed on the roadway top plate 1 and the roadway side part 3, and the grouting anchor cable 5 is constructed on the roadway bottom plate 2. Grouting anchor rods 4 are arranged on the top plate 1 of the roadway on two sides of each grouting anchor cable 5 in the width direction of the roadway, and the grouting anchor cables 5 comprise a plurality of grouting anchor cables; on the roadway side part 3, grouting anchor rods 4 and grouting anchor cables 5 are arranged at intervals in the height direction of the roadway, and the grouting anchor cables 5 comprise a plurality of grouting anchor cables 5; on the tunnel bottom plate 2, slip casting anchor rope 5 sets up wherein slip casting anchor rope 5 includes a plurality ofly at the interval.
In some embodiments, the yield load of the rod body of the grouting anchor rod 4 is not lower than 230kN, and the yield load of the grouting anchor cable body on the top plate of the roadway is not lower than 500kN; and the yield load of the grouting anchor cable bodies on the roadway side part and the roadway bottom plate is not lower than 400kN.
In the construction of the grouting anchor cable 5 and the grouting anchor rod 4, for example, the resin anchoring agent is firstly utilized for anchoring, and then high pretightening force is applied; wherein the high pre-tightening force is 40-70% of the yield load respectively. Namely, the high pretightening force of the grouting anchor rod 4 is at least 40-70% of 230kN, namely at least 92kN-161kN; namely, the high pretightening force of the grouting anchor cable 5 on the roadway top plate is at least 40-70% of 500kN, namely at least 200kN-350kN; namely, the high pretightening force of the grouting anchor cable 5 on the roadway side part and the roadway bottom plate is at least 40-70% of 400kN, namely at least 160kN-280kN.
The hole sealing structure of the grouting anchor cable 5 and the grouting anchor rod 4 is a hole sealing device self-expansion type or a mechanical extrusion self-expansion type, and the hole sealing pressure resistance is not lower than 15MPa. According to the construction method, the construction of the high-strength grouting anchor cable 5 and the grouting anchor rod 4 can be effectively carried out on the roadway top plate 1, the roadway side part 3, the roadway bottom plate 2 and the like respectively, the high-pressure grouting is carried out on the grouting anchor cable 5 and the grouting anchor rod 4 in the later stage to reinforce the surrounding rock of the roadway, the bearing performance of the whole grouting reinforcement ring is enhanced, the strength and the structure of the surrounding rock are obviously improved, and compared with the grouting anchor rod and the grouting anchor cable in the prior art, the bearing capacity of the grouting anchor rod and the grouting anchor cable in the construction method is improved by more than 20%, the construction method is suitable for high stress of a deep soft rock roadway, and the breakage probability is reduced; and the hole sealing pressure is improved by at least 3 times, and the grouting amount is obviously improved.
In some embodiments, the guniting layer 10 is formed by spraying guniting material, wherein the guniting material is one of concrete material, inorganic-organic composite material or organic polymer material; when the guniting material is a concrete material, the thickness of the guniting layer 10 is not less than 5cm; when the guniting material is an inorganic-organic composite material or an organic high polymer material, the thickness of the guniting layer 10 is not less than 5mm.
Illustratively, after the grouting anchor rod 4 and the grouting anchor cable 5 are constructed, a grouting device is adopted to spray a grouting material on the surfaces of the roadway top plate 1 and the roadway side wall part 3 to form a grouting layer, so as to seal the surface of the roadway surrounding rock and the anchor holes and the peripheral sides of the grouting anchor cable 5 and/or the grouting anchor rod 4 and prevent slurry leakage during grouting. Illustratively, the guniting material is one of a concrete material, an inorganic-organic composite material or an organic polymer material; in other words, the concrete material can be understood as concrete material mixed by sand, melon seed pieces and cement, and the description of the conventional material proportioning is omitted here. When the guniting material is a concrete material, the thickness of the guniting layer is not less than 5cm; in another understanding, when the guniting material is a high-performance inorganic-organic composite material or an organic high polymer material, the thickness of the guniting layer is not less than 5mm; the guniting layer in the embodiment can prevent slurry leakage during grouting; secondly, a reinforced concrete structure is formed with the metal net, so that the bearing performance is improved; and thirdly, enclosing the surrounding rock, isolating air and water in the roadway, preventing the surrounding rock from weathering and hydrating, and if the guniting layer is too thick, causing low construction efficiency and high cost, the guniting layer does not reach the standard, grouting and leaking, poor bearing performance and unobvious weathering and hydrating effects.
In some embodiments, the pier 6 has a diameter of not less than 200mm, a maximum bearing capacity of not less than 5000kN and an axial displacement of up to 200mm without breaking; the pier stud 6 comprises a pouring core 7 and a constraint shell 8 arranged outside the pouring core 7 in a surrounding mode.
After the high-pressure and high-prestress anchor is completely injected and before the coal face is stoped, at least one row of pier stud support frames are constructed between a roadway top plate 1 and a roadway bottom plate 2 in advance according to a fixed row distance, wherein each row of pier studs 6 are sequentially arranged at a certain distance along the extending direction of the roadway. The diameter of the pier stud 6 is not less than 200mm, and the pier stud comprises a pouring core 7 and a constraint shell 8 arranged outside the pouring core 7 in a surrounding mode, wherein the pouring core 7 is constructed by at least adopting concrete with the grade of more than C30 and mixing with at least one of high-water materials or high-performance fiber filling materials, the pouring core 7 in the embodiment can be understood as that the pouring core 7 is constructed by a concrete filling pump or a large-flow grouting pump in a pumping mode, and can be constructed by a single pump or more than two pumps at the same time; and the rated pumping flow is not lower than 500L/min, and the rated pumping flow is not lower than 500L/min.
In this embodiment, the restraint shell 8 is one of a plastic outer skin, an iron sheet, a steel pipe or a fiber, that is, the restraint shell 8 in this embodiment is provided with an auxiliary pouring core 7, so that the maximum bearing capacity of a single pier stud 6 is not lower than 5000kN, and the axial displacement reaches 200mm without cracking, thereby greatly enhancing the initial supporting capacity for the top plate, and reducing the influence of high-magnitude mining stress on the deformation of the top plate 1, the bottom plate and two sides of the soft rock roadway during the working face extraction.
In some embodiments, the top of the pier stud 6 is provided with an expansion 9 for enhancing the initial support capacity of the roof 1. As shown in fig. 4, an expansion material may be used at the top of the pier stud 6 during the construction process of the pier stud 6, and the arrangement of the expansion part 9 at the top of the pier stud 6 is implemented to enhance the initial supporting capability of the roadway roof 1.
According to the embodiment, the strength, the integrity and the anchoring force of surrounding rocks of the roadway are essentially improved through high-pressure anchor grouting by the grouting anchor rope 5 and the grouting anchor rod 4, the active control effect of high-prestress active support and high-pressure grouting active reinforcement of the grouting anchor rope 5 and the grouting anchor rod 4 is obviously improved, the large-tonnage pier column 6 is fused to support the roadway top plate 1, the bearing performance of the grouting anchor rope 5 and the grouting anchor rod 4 grouting reinforcement ring is integrally enhanced, the influence of mining stress is reduced, the coupling and the cooperation of active and passive control modes are really realized, and the large deformation of the surrounding rocks of the deep soft rock roadway can be fundamentally controlled. Therefore, the method is relatively simple, low in cost, capable of effectively controlling large deformation of the soft rock, deep high stress, strong dynamic pressure and other types of roadways and providing beneficial exploration.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. The utility model provides a supporting construction in soft rock tunnel in deep which characterized in that includes:
the grouting anchor rods and/or the grouting anchor cables are at least arranged on the roadway top plate and the roadway side part; the grouting anchor rod and the grouting anchor cable are both of hollow or solid structures, and the outer wall of the grouting anchor rod and the grouting anchor cable is provided with a grouting hole;
a guniting layer; the grouting anchor cable and the grouting anchor rod are arranged on the inner wall surfaces of the roadway top plate and the roadway side part and are used for sealing the surface of the roadway surrounding rock and the anchor holes and the peripheral sides of the grouting anchor cable and the grouting anchor rod; and
pier stud support frame, it is at least for a set of setting be in between tunnel roof and the tunnel bottom plate, a set of pier stud support frame includes a plurality of edges tunnel extending direction and interval have a distance the pier stud.
2. The deep soft rock roadway support structure of claim 1, wherein a plurality of grouting anchor cables are arranged on the roadway floor.
3. The deep soft rock roadway support structure of claim 2, wherein the inner ends of the grouting anchor rods and the grouting anchor cables are anchored in the roadway surrounding rock, and the outer ends of the grouting anchor rods and the grouting anchor cables are arranged on the inner wall of the roadway through anchor plates and nuts.
4. The support structure of the deep soft rock tunnel according to claim 2, wherein the yield load of the grouting anchor rod is not lower than 230kN, and the yield load of the grouting anchor cable body on the tunnel top plate is not lower than 500kN; and the yield load of the grouting anchor cable body on the roadway side part and the roadway bottom plate is not lower than 400kN.
5. The support structure for the deep soft rock roadway according to claim 2, wherein the hole sealing structure of the grouting anchor rope and the grouting anchor rod is a hole packer self-expansion type or a mechanical extrusion self-expansion type, and a pressure resistance pressure of the hole sealing structure is not lower than 15MPa.
6. The deep soft rock roadway support structure according to any one of claims 1 to 5, wherein the guniting layer is formed by spraying guniting material, wherein the guniting material is one of concrete material, inorganic-organic composite material or organic high polymer material; when the guniting material is a concrete material, the thickness of the guniting layer is not less than 5cm; when the guniting material is an inorganic-organic composite material or an organic high polymer material, the thickness of the guniting layer is not less than 5mm.
7. The support structure of a deep soft rock roadway according to claim 6, wherein the roadway roof is provided with a plurality of the grouting anchor rods and the grouting anchor cables; and the two ends of each grouting anchor cable in the width direction of the roadway are the grouting anchor rods.
8. The deep soft rock roadway support structure of claim 6, wherein a plurality of grouting anchor rods and grouting anchor cables are arranged on the roadway side part; the grouting anchor cables and the grouting anchor rods are alternately arranged at intervals in the height direction of the roadway.
9. The support structure of a deep soft rock roadway according to claim 6, wherein the diameter of the pier stud is not less than 200mm, the maximum bearing capacity is not less than 5000kN, and no fracture occurs when the axial displacement reaches 200 mm; the pier stud comprises a pouring core and a constraint shell arranged outside the pouring core in a surrounding mode.
10. The deep soft rock roadway support structure of claim 6, wherein an expansion portion is provided at a top portion of the pier stud for enhancing an initial supporting ability for the roadway roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202223593622.9U CN218862645U (en) | 2022-12-30 | 2022-12-30 | Supporting construction in deep soft rock tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223593622.9U CN218862645U (en) | 2022-12-30 | 2022-12-30 | Supporting construction in deep soft rock tunnel |
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| CN218862645U true CN218862645U (en) | 2023-04-14 |
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| CN202223593622.9U Active CN218862645U (en) | 2022-12-30 | 2022-12-30 | Supporting construction in deep soft rock tunnel |
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