CN115163152A - Half-coal-rock roadway filler wall combined supporting system and construction method thereof - Google Patents
Half-coal-rock roadway filler wall combined supporting system and construction method thereof Download PDFInfo
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- CN115163152A CN115163152A CN202210880811.XA CN202210880811A CN115163152A CN 115163152 A CN115163152 A CN 115163152A CN 202210880811 A CN202210880811 A CN 202210880811A CN 115163152 A CN115163152 A CN 115163152A
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- roadway
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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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
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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
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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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)
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- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a combined supporting system for a filling wall of a semi-coal-rock roadway, which comprises grouting anchor cables, a sprayed concrete layer, a buffering wood plate, a filling wall, prestressed anchor cables, a temporary supporting layer and a contractible U-shaped steel bracket, wherein the grouting anchor cables are arranged among the contractible U-shaped steel bracket; the sprayed concrete layer is used for covering exposed surrounding rocks on the upper surface of the roadway and closing the contractible U-shaped steel support; the buffer wood plate is a supporting structure with an expansion section arranged at the top of the coal seam; the filler wall is a concrete pouring support structure arranged on the expansion section; the prestressed anchor cable is arranged on the bottom plate; the temporary supporting layer is a coal layer reserved between the two extension sections; yieldable U shaped steel support sets up on tunnel initial shotcrete surface. According to the invention, by means of expanding and arranging the filler walls on two sides of the roadway, the great discontinuity of deformation and stress distribution caused by strength and structural difference between the coal bed and the rock mass and the stress condition of the supporting structure can be improved, and the large deformation of the side wall of the semi-coal-rock roadway can be effectively controlled.
Description
Technical Field
The invention belongs to the technical field of underground coal mine roadway support, and particularly relates to a combined support system of a half-coal-rock roadway filler wall, which is particularly suitable for deep large-deformation half-coal-rock roadways with side walls seriously deformed due to discontinuous surrounding rock structures under the action of bearing high ground stress.
Background
With the continuous improvement of the economic level of China, the demand for coal is increasing day by day, and the coal mine industry is rapidly developed. In the process of producing coal, a roadway is used as a main project in the process of underground mining, and the stability of the roadway plays a vital role in the production safety of people. However, due to the complexity of geological conditions of underground rock masses, coal mine tunnels have many stability problems, especially half coal rock tunnel engineering, instability and damage of a tunnel supporting structure are serious due to discontinuity of surrounding rock structures and incongruity of surrounding rock deformation under the action of high ground stress, once damage occurs, maintenance is very difficult, and normal operation of coal mines is directly influenced.
According to the proportion of the coal seam size (a) to the roadway section size (b), the coal mine underground roadways are divided into three types: coal roadway (a/b is more than or equal to 80%), rock roadway (a/b is less than or equal to 20%) and half coal roadway (20% < a/b < 80%). The semi-coal rock roadway has the characteristics of discontinuity of surrounding rock structures and incompatibility of surrounding rock deformation and damage, and a new challenge is brought to the stability control of the roadway. Due to structural discontinuity of surrounding rocks and strength difference of coal rock bodies, deformation and fracture evolution characteristics of the coal rock bodies after roadway excavation are greatly different, particularly at the position of a side wall. Therefore, the semi-coal rock roadway support is one of the most complex technical problems in underground engineering and is also one of the basic problems in underground resource exploitation.
In the excavation process of the semi-coal-rock roadway, surrounding rocks are disturbed, a weak coal bed is firstly destroyed in the ground stress redistribution process, the conventional support technology at present is difficult to meet the support requirement of the semi-coal-rock roadway under the complex condition, so that the side wall of the excavated roadway is large in deformation and large in support difficulty and needs to be repaired and maintained continuously, the normal use of the roadway is seriously influenced, the construction cost is increased, and the personal safety of workers is greatly threatened. Therefore, a novel roadway support method is needed to be provided, the large deformation effect of the semi-coal-rock roadway is ensured to be controlled, and the deformation difference between the weak coal seam and the rock stratum is controlled.
Disclosure of Invention
The invention aims to overcome the defects of the conventional support technology of the semi-coal-rock roadway and provide a combined support system of a filling wall of the semi-coal-rock roadway so as to control large deformation caused by inconsistent surrounding rock deformation at two sides of the roadway.
In order to achieve the purpose, the invention adopts the following technical scheme:
the combined supporting system of the semi-coal-rock roadway filler wall comprises grouting anchor cables, a sprayed concrete layer, a buffering wood plate, a filler wall, prestressed anchor cables, a temporary supporting layer and retractable U-shaped steel supports, and is characterized in that the grouting anchor cables are arranged on the inner wall of the roadway between the retractable U-shaped steel supports; the sprayed concrete layer is used for covering exposed surrounding rocks on the upper surface of the roadway and closing the contractible U-shaped steel support; the buffer wood plate is a supporting structure with an expansion section arranged at the top of the coal seam; the filler wall is a concrete pouring support structure arranged at the expansion section; the prestressed anchor cable is arranged on the bottom plate; the temporary supporting layer is a coal layer reserved between the two extension sections; the contractibility U-shaped steel support is arranged on the surface of the roadway primarily sprayed concrete.
In the combined supporting system of the half-coal-rock roadway filler wall, the thickness of the buffer wood board is 50-100mm, the buffer wood board is connected with a top rock stratum to buffer the lateral thrust of the sinking of the top plate on the filler wall, the filler wall replaces the coal seam part to form a supporting structure, and the gap part of the filler wall is expanded and reinforced through grouting.
In order to guarantee the strength and the integrity of a supporting system, the U-shaped steel yieldable supports are uniformly arranged and the arrangement distance is 3m.
The invention relates to a construction method of a combined supporting system of a half coal rock roadway filler wall, which specifically comprises the following steps of:
the first step is as follows: excavating a section according to a design scheme, wherein the excavation length of the section is 10m each time, and a coal bed of 10m is reserved between two excavation sections to serve as a temporary supporting layer;
the second step: and after the roadway is excavated for one time, expanding the coal beds on two sides of the roadway. A buffer wood plate with the thickness of 50-100mm is arranged on the upper side of the expansion section and is connected with the top rock;
the third step: the expansion section is sealed by a template, and a filling wall supporting structure poured by C25 concrete is arranged;
the fourth step: when the concrete reaches a certain supporting strength, the rest part is expanded and reinforced through grouting. Pumping concrete paste filler into a template through a pipeline by adopting a long-distance concrete conveying technology, and curing to form a concrete filled wall;
the fifth step: spraying 0.1m of concrete on the top and the side wall, and installing a contractible U-shaped steel bracket at the interval of 3m;
and a sixth step: mounting grouting anchor cables in the middle of the two contractible U-shaped steel supports for grouting, filling cracks in the surrounding rock and gaps between the surrounding rock and a filling wall, and arranging prestressed anchor cables on the bottom plate;
the seventh step: and spraying concrete with the thickness of 0.3m on the top, two side walls and the bottom of the roadway. In site operation, the contractible U-shaped steel support is firstly sealed, and when the deformation of the roadway tends to be stable, concrete is sprayed on the contractible U-shaped steel support.
Compared with the prior art, the combined supporting system of the half-coal-rock roadway filler wall has the following advantages:
(1) The combined supporting system of the semi-coal rock roadway filler wall is considered from the angles of different lithologies and uncoordinated deformation, and a filler wall structure is arranged, so that the friction effect, the shearing strength and the bonding degree between a rock stratum and the filler wall are increased, the overall stability of the roadway is improved, and the range of a surrounding rock plastic zone is effectively reduced.
(2) A wood board with the thickness of 50-100mm is arranged on the upper side of the excavation section and connected with the rock stratum, so that the lateral thrust of the top plate sinking to the filler wall can be buffered, and a certain deformation space can be reserved for the top plate.
(3) The stability of tunnel expansion section has been guaranteed to the temporary support layer, makes expansion section stratum atress more reasonable, provides sufficient time for pouring of infilled wall.
Drawings
Fig. 1 is a schematic structural view of a combined supporting system of a filling wall of a half-coal rock roadway.
Fig. 2 is a schematic view of the infilled wall support of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Illustration of the drawings: 1-grouting an anchor cable; 2-spraying a concrete layer; 3-buffering the wood board; 4-filling walls; 5-prestressed anchorage cable; 6-temporary support layer; 7-yieldable U-shaped steel bracket.
Detailed Description
The invention provides a combined supporting system of a half-coal-rock roadway filler wall and a construction method thereof, and in order to make the technical scheme, the achievement purpose and the efficacy characteristics of the combined supporting system more clear and definite, the specific implementation mode of the combined supporting system is further explained by combining the attached drawings.
As shown in the figure I, the combined supporting system of the semi-coal rock roadway filler wall comprises seven parts, namely a grouting anchor rope 1, a sprayed concrete layer 2, a buffer wood plate 3, a filler wall 4, a prestressed anchor rope 5, a temporary supporting layer 6 and a contractible U-shaped steel bracket 7, wherein the grouting anchor rope 1 is arranged on the inner wall of the roadway between the two contractible U-shaped steel brackets 7 to fill cracks in surrounding rocks and gaps between the surrounding rocks and the filler wall 4; the sprayed concrete layer 2 is used for covering exposed surrounding rocks on the upper surface of the roadway and closing the contractible U-shaped steel bracket 7; the buffer wood plate 3 is a supporting structure arranged at the top of a coal seam after the coal seams at two sides of the roadway are expanded so as to buffer the lateral thrust of the sinking of the top plate on the filler wall 4; the filler wall 4 is a filler wall supporting structure formed by expanding coal beds on two sides of a roadway and then pouring C25 concrete; the prestressed anchor cable 5 is arranged on the bottom plate; the temporary support layer 6 is formed by reserving a 10m coal seam between the two expansion sections as a temporary support; the contractible U-shaped steel support 7 is arranged on the surface of the roadway primarily sprayed concrete and is sealed by a sprayed concrete layer 2.
In the combined supporting system of the filling wall of the semi-coal-rock roadway, the thickness of the buffering wood plate 3 is 50-100mm, the buffering wood plate is connected with a top rock stratum to buffer the lateral thrust of a top plate sinking to the filling wall 4, the filling wall 4 replaces a coal seam part to form a supporting structure, and a gap part of the filling wall 4 is expanded and reinforced through grouting.
In order to ensure the strength and integrity of the support system, the retractable U-shaped steel brackets 7 are uniformly arranged and the arrangement distance is 3m.
The invention relates to a construction method of a combined supporting system of a half-coal-rock roadway filler wall, which specifically comprises the following steps:
the first step is as follows: excavating a section according to a design scheme, wherein the excavation length of the section is 10m each time, and a coal bed of 10m is reserved between two excavation sections to serve as a temporary supporting layer 6;
the second step: and after the roadway is excavated for one time, expanding the coal beds on two sides of the roadway. A buffer wood plate 3 with the thickness of 50-100mm is arranged on the upper side of the expansion section and is connected with the top rock;
the third step: the expansion section is sealed by a template, and a C25 concrete poured filler wall 4 supporting structure is arranged;
the fourth step: when the concrete reaches a certain supporting strength, the rest part is expanded and reinforced through grouting. Pumping the concrete paste filler into a template through a pipeline by adopting a long-distance concrete conveying technology, and curing to form a concrete filled wall;
the fifth step: spraying 0.1m of concrete on the top and the side wall, and installing flexible U-shaped steel brackets 7 at the interval of 3m;
and a sixth step: installing a grouting anchor cable 1 in the middle of the two contractible U-shaped steel brackets 7 for grouting, filling cracks in the surrounding rock and gaps between the surrounding rock and a filler wall, and arranging a prestressed anchor cable 5 on the bottom plate;
the seventh step: and spraying concrete with the thickness of 0.3m on the top, two side walls and the bottom of the roadway. In the field construction, the contractible U-shaped steel support 7 is firstly sealed, and when the deformation of the roadway tends to be stable, concrete is sprayed on the contractible U-shaped steel support 7.
Claims (7)
1. A combined supporting system for a filling wall of a semi-coal-rock roadway comprises grouting anchor cables, a sprayed concrete layer, a buffering wood plate, the filling wall, pre-stressed anchor cables, a temporary supporting layer and retractable U-shaped steel supports, and is characterized in that the grouting anchor cables are arranged on the inner wall of the roadway between the retractable U-shaped steel supports; the sprayed concrete layer is used for covering exposed surrounding rocks on the upper surface of the roadway and closing the contractible U-shaped steel support; the buffer wood plate is a support structure with an expansion section arranged at the top of the coal seam, is used for buffering the lateral thrust of the sinking of the rock at the top to the filler wall, and leaves a certain deformation space; the filler wall is a concrete pouring support structure arranged at the expansion section; the prestressed anchor cable is arranged on the bottom plate; the temporary supporting layer is a coal layer reserved between the two extension sections; the contractibility U-shaped steel support is arranged on the surface of the roadway primarily sprayed concrete.
2. The combined supporting and protecting system for the filling wall of the semi-coal rock roadway as claimed in claim 1, wherein the thickness of the buffering wood board is 50-100mm, and the buffering wood board is connected with the top rock.
3. The combined supporting and protecting system for the filling wall of the semi-coal rock roadway, according to claim 1, is characterized in that the gap part of the filling wall is expanded and reinforced through grouting.
4. The combined supporting system of the half coal rock roadway filler wall as claimed in claim 1, wherein the retractable U-shaped steel supports are 29U-shaped steel supports, and the arrangement distance is 3m.
5. The combined supporting system of the half coal rock roadway infilled wall as claimed in claim 1, wherein the shotcrete layer is divided into two layers, one layer is sprayed on the upper surface of the roadway and covers the exposed surrounding rock, and the other layer covers the retractable U-shaped steel support in the shotcrete layer.
6. The combined supporting system of the filling walls of the semi-coal rock roadway, as claimed in claim 1, wherein the filling walls replace part of the coal seam to form a supporting structure.
7. The construction method of the combined supporting system for the filling walls of the semi-coal rock roadway according to claim 1, characterized by comprising the following steps:
the first step is as follows: excavating a section according to a design scheme, wherein the excavation length of the section is 10m each time, and reserving a coal bed of 10m as a temporary supporting layer between two excavation sections;
the second step: after the tunnel is excavated for one time, expanding the coal beds on two sides of the tunnel, and arranging a buffering wood plate with the thickness of 50-100mm on the upper side of the expansion section to be connected with the rock stratum;
the third step: the expansion section is sealed by a template, and a C25 concrete poured filler wall supporting structure is arranged;
the fourth step: when the concrete reaches a certain supporting strength, the rest part is expanded and reinforced through grouting, a long-distance concrete conveying technology is adopted, concrete paste filler is pumped into the template through a pipeline, and the concrete filled wall is formed after curing;
the fifth step: spraying 0.1m of concrete on the top and the side wall, and installing a contractible U-shaped steel bracket at the interval of 3m;
and a sixth step: mounting grouting anchor cables in the middle of the two contractible U-shaped steel supports for grouting, filling cracks in the surrounding rock and gaps between the surrounding rock and a filling wall, and arranging prestressed anchor cables on the bottom plate;
the seventh step: and (3) spraying concrete with the thickness of 0.3m on the top, two side walls and the bottom of the roadway, firstly sealing the contractible U-shaped steel support in site construction, and spraying the concrete on the contractible U-shaped steel support when the deformation of the roadway tends to be stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210880811.XA CN115163152A (en) | 2022-07-26 | 2022-07-26 | Half-coal-rock roadway filler wall combined supporting system and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210880811.XA CN115163152A (en) | 2022-07-26 | 2022-07-26 | Half-coal-rock roadway filler wall combined supporting system and construction method thereof |
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| CN115163152A true CN115163152A (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210880811.XA Withdrawn CN115163152A (en) | 2022-07-26 | 2022-07-26 | Half-coal-rock roadway filler wall combined supporting system and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044460A (en) * | 2023-03-31 | 2023-05-02 | 山西凌志达煤业有限公司 | Multi-size mine tunnel supporting device |
-
2022
- 2022-07-26 CN CN202210880811.XA patent/CN115163152A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044460A (en) * | 2023-03-31 | 2023-05-02 | 山西凌志达煤业有限公司 | Multi-size mine tunnel supporting device |
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Application publication date: 20221011 |