CN116609509A - Novel compaction grouting test device and method for broken coal rock mass - Google Patents
Novel compaction grouting test device and method for broken coal rock mass Download PDFInfo
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- CN116609509A CN116609509A CN202310591315.7A CN202310591315A CN116609509A CN 116609509 A CN116609509 A CN 116609509A CN 202310591315 A CN202310591315 A CN 202310591315A CN 116609509 A CN116609509 A CN 116609509A
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- 239000003245 coal Substances 0.000 title claims abstract description 57
- 239000011435 rock Substances 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000005056 compaction Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 8
- 238000005065 mining Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000012669 compression test Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012613 in situ experiment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a novel compaction grouting test device and method for crushed coal rock mass, wherein the device comprises a pressure-bearing fixing plate and a cylinder barrel, the pressure-bearing fixing plate is arranged above the cylinder barrel and is connected with the cylinder barrel through bolts, a plurality of steel columns are arranged on the lower surface of the pressure-bearing fixing plate, a backing plate is connected below the steel columns, the periphery of the backing plate is wrapped by a rubber pad, an exhaust port is arranged in the middle of the backing plate, and the exhaust port is connected with an exhaust hose; the bottom of the cylinder barrel is provided with a grouting pipe which is connected with a grouting system; the grouting reinforcement device can simulate the filling reinforcement process of the coal mine goaf under different stress conditions, can perform grouting test under the condition of unchanged pressure, is simple in structure and convenient to detach, is beneficial to standard sampling of a model sample after grouting, and further analyzes the characteristics of grouting reinforcement bodies.
Description
Technical Field
The invention relates to the technical field of filling tests of underground engineering goafs, in particular to a novel compaction grouting test device and method for broken coal rock mass.
Background
The grouting technology is to inject some curable slurry into cracks or holes of soil layer and rock stratum by using the principles of air pressure, hydraulic pressure, etc. to cure and coagulate the slurry and the rock stratum together. At present, the grouting technology is widely applied to tunnel engineering, side slope engineering, foundation engineering, dam engineering and the like, has special and irreplaceable functions in the fields of geological disaster management, underground surrounding rock reinforcement, building structure reinforcement and the like, and can provide important guarantee for traffic, building, mineral products, water conservancy, pipeline engineering construction and operation safety.
In order to obtain more coal resources, the most commonly used mining method at present is filling mining, and the use advantage of the method is that the coal mining rate is extremely high, and the mining efficiency can be effectively improved. However, the large-scale popularization of the mining technology is hindered due to the defects of complex process, high cost investment and the like. In underground grouting engineering of coal mine, reasonable grouting materials, slurry proportion and grouting pressure are important bases for successful application of grouting modification and reinforcement technology. Because grouting modification and reinforcement have strong concealment, complex field procedures and high construction cost, slurry can flow, diffuse and solidify in the deep part of a coal rock body under the drive of pressure, so that in-situ experiments and evaluation of grouting modification and reinforcement effects are difficult to develop in the underground coal mine.
Although some grouting test devices exist in the prior art, the following disadvantages exist: due to the complexity and the variability of the coal rock mass, the model test is difficult to achieve that all aspects are similar to the underground coal rock mass, and when simulated grouting reinforcement is carried out, the flow and the diffusion of the real model slurry in the coal rock mass can not be realized due to the limitation of test equipment, so that the effect and the credibility of the model test are seriously influenced.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the novel compaction grouting test device and the novel compaction grouting test method for the crushed coal rock mass, which can simulate the filling and reinforcing processes of the goaf of the coal mine under different stress conditions, and improve the accuracy of data obtained by a simulation test.
The technical scheme of the invention is as follows:
in a first aspect of the invention, a novel compaction grouting test device for crushed coal rock mass is provided, and comprises a pressure-bearing fixing plate and a cylinder barrel, wherein the pressure-bearing fixing plate is arranged above the cylinder barrel and is connected with the cylinder barrel through bolts, a plurality of steel columns are arranged on the lower surface of the pressure-bearing fixing plate, a steel plate is connected below the steel columns, the periphery of a backing plate is wrapped by a rubber pad, an exhaust port is arranged in the middle of the steel plate, and the exhaust port is connected with an exhaust hose; the bottom of the cylinder barrel is provided with a grouting pipe, and the grouting pipe is connected with a grouting system.
In some embodiments of the present invention, the bolts include a plurality of bolts fixed to the lower surface of the pressure-bearing fixing plate in a welded manner and uniformly arranged along the outer circumference of the pressure-bearing fixing plate.
In some embodiments of the invention, an outer edge steel plate is preset at the top of the cylinder barrel, and a plurality of bolt holes are arranged on the outer edge steel plate, wherein the bolt holes correspond to the bolts on the pressure-bearing fixing plate.
In some embodiments of the invention, the rubber pad has an outer diameter that is the same as the inner diameter of the cylinder, and the rubber pad remains in close proximity to the cylinder during compaction.
In some embodiments of the present invention, the grouting system comprises a grouting pipe, a grouting bent pipe, a grouting barrel, a grouting hose and an air compressor which are connected in sequence.
In some embodiments of the invention, a grouting pipe valve is arranged on the grouting pipe, and a grouting pipe valve is arranged on the grouting pipe.
In some embodiments of the invention, the connection between the grouting pipe and the grouting elbow is sealed by a sealing ring.
In some embodiments of the invention, a vent hose valve is disposed within the vent hose.
In a second aspect of the invention, a novel crushed coal rock mass compaction grouting test method is provided, comprising the following steps:
(1) Placing the cylinder barrel on a servo, placing crushed coal and rock mass into the cylinder barrel, placing the whole formed by the pressure-bearing fixing plate and the base plate wrapped with the rubber pad into the cylinder barrel, and closing each valve at the moment;
(2) The hydraulic rod of the servo machine is controlled by a computer to apply a set load to the device to simulate the stress born by the broken coal and rock mass of the goaf;
(3) After loading, the pressure-bearing fixing plate and the cylinder barrel are fixed together through the high-strength bolts, so that the position of the backing plate is fixed, and the pressure state of the crushed coal rock body is kept unchanged;
(4) The device is taken down and placed on a supporting frame, the crushed coal rock mass compacted in the device is subjected to grouting through a grouting system, grouting is stopped after a preset grouting effect is achieved, and a sample is maintained.
(5) After the grouting sample maintenance is completed, the mould is removed, and the grouting sample can be polished into a standard sample and numbered so as to carry out subsequent mechanical tests.
In some embodiments of the invention, in step (2), the pressure loading is in the range of 0-3MP.
One or more of the technical schemes of the invention has the following beneficial effects:
the novel compaction grouting test device for the crushed coal rock mass can simulate the filling and reinforcing process of a coal mine goaf under different stress conditions, can perform grouting test under the condition of unchanged pressure, is simple in structure and convenient to detach, is beneficial to standard sampling of a model sample after grouting, and further analyzes the characteristics of grouting reinforcing bodies.
According to the novel compaction grouting test device for the broken coal rock mass, after the hydraulic rod applies a set load to the device to simulate the stress borne by the broken coal rock mass in the goaf, the pressure-bearing fixing plate and the cylinder barrel can be fixed together through the high-strength bolts, so that the position of the base plate is fixed, and the pressure state borne by the broken coal rock mass is kept unchanged.
According to the novel compaction grouting test device for the crushed coal rock mass, the high-strength bolts are used for fixing the positions of the bearing plates, so that the cylinder barrel can be detached under the condition that the pressure state is unchanged, and is convenient to place on the support frame for grouting, and subsequent maintenance and other works can be performed under the condition that uniaxial compression test equipment is saved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a novel crushed coal rock mass compaction grouting test device;
FIG. 2 is a front view of the cylinder and pressure-bearing retainer plate of the present invention;
FIG. 3 is a front view of the pressure-bearing fixing plate of the present invention;
fig. 4 is a schematic installation view of the cylinder barrel and the grouting pipe of the invention.
In the figure: 1-a pressure-bearing fixing plate; 2-bolts; 3-an exhaust hose valve; 4-an exhaust hose; 5-steel columns; 6-a rubber pad; 7-bolt holes; 8-cylinder barrel; 9-grouting pipe; 10-grouting pipe valve; 11-a supporting frame; 12-grouting elbow valve; 13-a sealing ring; 14-grouting elbow pipe; 15-grouting barrel; 16-grouting hose; 17-an air compressor.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
In a typical embodiment of the invention, as shown in fig. 1, a novel compaction grouting test device for crushed coal rock is provided, and comprises a pressure-bearing fixing plate 1 and a cylinder 8, wherein the pressure-bearing fixing plate 1 is arranged above the cylinder 8, the pressure-bearing fixing plate 1 is connected with the cylinder 8 through bolts 2, a plurality of steel columns 5 are arranged on the lower surface of the pressure-bearing fixing plate 1, a base plate is connected below the steel columns 5, the base plate is a round steel plate, the periphery of the base plate is wrapped with a rubber pad 6, the base plate can be tightly attached to the cylinder during pressurization so as to increase the compactness of crushed coal rock, an exhaust port is arranged in the middle of the base plate, and the exhaust port is connected with an exhaust hose 4; the bottom of the cylinder barrel 8 is provided with a grouting pipe 9, and the grouting pipe 9 is connected with a grouting system.
As shown in fig. 2 and 3, the shape of the pressure-bearing fixing plate 1 is circular, a plurality of bolts are provided, four bolts can be specifically provided, the high-strength bolts are fixed on the lower surface of the pressure-bearing fixing plate in a welding mode and are uniformly distributed along the periphery of the pressure-bearing fixing plate 1, a plurality of steel columns 5 are arranged on the inner ring of the pressure-bearing fixing plate 1, the bottoms of the steel columns 5 are connected with steel plates, eight steel columns can be specifically provided, the length of each steel column is greater than that of each bolt, the pressure-bearing fixing plate, each steel column, each bolt and a cushion plate for wrapping a rubber cushion form a pressure-bearing cushion plate module, the pressure-bearing fixing plate can be fixed with a cylinder barrel through the bolts after load loading is completed, and the position of the pressure-bearing steel plates connected below the steel columns can be kept unchanged so as to simulate crushed coal rock grouting filling test under the stress. The cylinder is formed by rolling high-strength steel, an outer edge steel plate is preset at the top of the cylinder 8, a plurality of bolt holes 7 are formed in the steel plate, the bolt holes 7 correspond to bolts on the pressure-bearing fixing plate 1, the outer diameter of the rubber pad is the same as the inner diameter of the cylinder, and the rubber pad and the cylinder are tightly attached in the compaction process.
In this embodiment, the exhaust hose valve 3 is disposed in the exhaust hose 16, so that on one hand, air in the hole can be removed during grouting to reduce the pressure of the cylinder barrel, so that grouting is easier, and on the other hand, when slurry flows out of the hole, grouting is completed, and the slurry fills the hole in the crushed coal rock body.
The grouting system comprises a grouting pipe 9, a grouting bent pipe 14, a grouting barrel 15, a grouting hose 16 and an air compressor 17 which are sequentially connected, as shown in fig. 4, a hole is formed in the bottom of the cylinder barrel, the grouting pipe is connected with the grouting system, a section of cylinder barrel is reserved at the lower part of the cylinder barrel, so that the flatness of the device is maintained, and the grouting system can be connected to perform grouting on broken coal and rock mass after compaction. The grouting pipe valve 10 is arranged on the grouting pipe 9, when crushed coal and rock are compacted, the valve is closed to prevent crushed small-particle-size broken stone from leaking, when grouting is performed, the valve is opened to perform grouting filling, the grouting pipe valve 12 is arranged in the grouting pipe 14, one end of the grouting hose 16 is connected with the grouting barrel 15, and the other end is connected with the air compressor 17. The size of the grouting pipe is slightly larger than that of a grouting elbow pipe of the grouting system, the joint of the grouting pipe 9 and the grouting elbow pipe 14 is sealed by a sealing ring 13, and stable pressure is provided for slurry in a grouting barrel through an air compressor, so that the device achieves the purpose of simulating goaf filling and reinforcing.
The application method of the novel crushed coal rock mass compaction grouting device provided by the embodiment is as follows:
(1) Sequentially placing the cylinder 8 on a servo machine according to the steps, placing crushed coal and rock into the cylinder 8, placing the pressure-bearing fixing plate 1 into the cylinder, and closing the exhaust hose valve 3 and the grouting pipe valve 10 at the moment;
(2) The hydraulic rod of the servo is controlled by a computer to apply a set load to the device to simulate the stress borne by the broken coal and rock mass of the goaf, and the pressure of 0-3MP can be set;
(3) After loading, the pressure-bearing fixing plate 1 and the cylinder barrel 8 are fixed together through the high-strength bolts 2, so that the position of the backing plate is fixed, and the pressure state of the broken coal rock mass is kept unchanged;
(4) As shown in fig. 1, the device is taken down and placed on a supporting frame 11, a grouting pipe 9 is connected with a grouting elbow 14 of a grouting system, the grouting elbow is connected with a grouting hose 16, the other end of the grouting hose is connected with a grouting barrel 15, and an air compressor 17 is connected with the other end of the grouting barrel by virtue of the grouting hose; after that, the exhaust hose valve 3, the grouting pipe 10 and the grouting elbow valve 12 are opened, the air compressor is started to perform grouting on the crushed coal rock mass compacted in the device, grouting is stopped after a preset grouting effect is achieved, and the sample is maintained.
(5) After the grouting sample maintenance is completed, the mould is removed, and the grouting sample can be polished into a standard sample and numbered so as to carry out subsequent mechanical tests.
Example 2
In an exemplary embodiment of the present invention, a novel compaction grouting test method for crushed coal rock mass is provided, comprising the following steps:
(1) Placing the cylinder barrel on a servo, placing broken coal and rock mass into the cylinder barrel, placing the whole body formed by the bearing fixed plate and the base plate wrapped with the rubber pad into the cylinder barrel, and closing each valve at the moment;
(2) The hydraulic rod of the servo machine is controlled by a computer to apply a set load to the device to simulate the stress born by the broken coal and rock mass of the goaf;
(3) After loading, the pressure-bearing fixing plate and the cylinder barrel are fixed together through the high-strength bolts, so that the position of the backing plate is fixed, and the pressure state of the crushed coal rock body is kept unchanged;
(4) The device is taken down and placed on a supporting frame, the crushed coal rock mass compacted in the device is subjected to grouting through a grouting system, grouting is stopped after a preset grouting effect is achieved, and a sample is maintained.
(5) After the grouting sample maintenance is completed, the mould is removed, and the grouting sample can be polished into a standard sample and numbered so as to carry out subsequent mechanical tests.
Further, in the step (2), the pressure loading range is 0-3MP, in the step (3), the high-strength bolts are used for fixing the positions of the bearing plates, so that the cylinder barrel can be detached under the condition that the pressure state is unchanged, and the cylinder barrel can be conveniently placed on the support frame for grouting, and can also be used for subsequent maintenance and other works under the condition of saving single-shaft compression test equipment.
While the foregoing embodiments have been described in detail in connection with the embodiments of the invention, it should be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like made within the principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The novel compaction grouting test device for the crushed coal rock mass is characterized by comprising a pressure-bearing fixing plate and a cylinder barrel, wherein the pressure-bearing fixing plate is arranged above the cylinder barrel, the pressure-bearing fixing plate is connected with the cylinder barrel through bolts, a plurality of steel columns are arranged on the lower surface of the pressure-bearing fixing plate, a backing plate is connected below the steel columns, the periphery of the backing plate is wrapped with a rubber pad, an exhaust port is arranged in the middle of the backing plate, and the exhaust port is connected with an exhaust hose; the bottom of the cylinder barrel is provided with a grouting pipe, and the grouting pipe is connected with a grouting system.
2. The novel crushed coal rock mass compaction grouting testing apparatus according to claim 1, wherein the bolts comprise a plurality of bolts which are fixed on the lower surface of the pressure-bearing fixing plate in a welding manner and are uniformly arranged along the outer circumference of the pressure-bearing fixing plate.
3. The novel crushed coal rock mass compaction grouting test device according to claim 2, wherein an outer edge steel plate is preset at the top of the cylinder barrel, a plurality of bolt holes are formed in the outer edge steel plate, and the bolt holes correspond to bolts on the pressure-bearing fixing plate.
4. The novel crushed coal rock mass compaction grouting test device according to claim 1, wherein the outer diameter of the rubber pad is the same as the inner diameter of the cylinder barrel, and the rubber pad is tightly attached to the cylinder barrel in the compaction process.
5. The novel crushed coal rock mass compaction grouting test device according to claim 1, wherein the grouting system comprises a grouting pipe, a grouting bent pipe, a grouting barrel, a grouting hose and an air compressor which are connected in sequence.
6. The novel crushed coal rock mass compaction grouting test device according to claim 5, wherein a grouting pipe valve is arranged on the grouting pipe, and a grouting pipe valve is arranged on the grouting pipe.
7. The novel crushed coal rock mass compaction grouting test device according to claim 5, wherein the joint of the grouting pipe and the grouting bent pipe is sealed by a sealing ring.
8. The novel crushed coal rock mass compaction grouting test device according to claim 1, wherein an exhaust hose valve is arranged in the exhaust hose.
9. A novel compaction grouting test method for crushed coal rock mass, which is realized by adopting the test device as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:
(1) Placing the cylinder barrel on a servo, placing crushed coal and rock mass into the cylinder barrel, placing the whole formed by the pressure-bearing fixing plate and the base plate wrapped with the rubber pad into the cylinder barrel, and closing each valve at the moment;
(2) The hydraulic rod of the servo machine is controlled by a computer to apply a set load to the device to simulate the stress born by the broken coal and rock mass of the goaf;
(3) After loading, the pressure-bearing fixing plate and the cylinder barrel are fixed together through the high-strength bolts, so that the position of the backing plate is fixed, and the pressure state of the crushed coal rock body is kept unchanged;
(4) The device is taken down and placed on a supporting frame, the crushed coal rock mass compacted in the device is subjected to grouting through a grouting system, grouting is stopped after a preset grouting effect is achieved, and a sample is maintained.
(5) After the grouting sample maintenance is completed, the mould is removed, and the grouting sample can be polished into a standard sample and numbered so as to carry out subsequent mechanical tests.
10. The method of claim 9, wherein in step (2), the pressure loading is in the range of 0-3MP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310591315.7A CN116609509A (en) | 2023-05-23 | 2023-05-23 | Novel compaction grouting test device and method for broken coal rock mass |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310591315.7A CN116609509A (en) | 2023-05-23 | 2023-05-23 | Novel compaction grouting test device and method for broken coal rock mass |
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| Publication Number | Publication Date |
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| CN116609509A true CN116609509A (en) | 2023-08-18 |
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| CN202310591315.7A Pending CN116609509A (en) | 2023-05-23 | 2023-05-23 | Novel compaction grouting test device and method for broken coal rock mass |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118150406A (en) * | 2024-05-09 | 2024-06-07 | 中国矿业大学(北京) | Low-strength loose coal grouting test device and test method |
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2023
- 2023-05-23 CN CN202310591315.7A patent/CN116609509A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118150406A (en) * | 2024-05-09 | 2024-06-07 | 中国矿业大学(北京) | Low-strength loose coal grouting test device and test method |
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