Grouting long-distance diffusion consolidation performance testing device and method suitable for field

Abstract

In order to timely and intuitively grasp diffusion and consolidation performance parameters of grouting slurry and solve corresponding problems in the prior art, the invention provides a device and a method for testing long-distance diffusion and consolidation performance of grouting, which are suitable for being used on site. According to the method, the most similar environment with the maximum proportion reduction is provided for on-site slurry grouting diffusion consolidation, the variability of the on-site environment can be met, and reference is provided for actual engineering construction such as the length of the goaf, the inclination angle of a goaf bottom plate and the height distance between grouting holes and the goaf. The angle of the device can be adjusted according to different dip angles of a field goaf, and field grouting is simulated to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine grouting filling, and in particular relates to a grouting long-distance diffusion consolidation performance testing device and method suitable for on-site use. Background Art

[0002] Grouting filling is an important part of green coal mining technology. It plays a huge role in relieving the "three-down" coal pressure. It can effectively control surface subsidence, effectively protect ground structures, effectively improve production efficiency, and effectively reduce filling costs.

[0003] In coal mine grouting and filling mining, the diffusion and consolidation properties of the grouting slurry are what technicians need to master in a timely manner. The performance of the grouting slurry plays an important role in the technicians' slurry configuration and grouting construction. Therefore, how to simply and intuitively obtain the diffusion and consolidation performance parameters of the grouting slurry is a technical problem that urgently needs to be solved in the field of grouting and filling technology. Summary of the invention

[0004] In order to timely and intuitively grasp the diffusion and consolidation performance parameters of grouting slurry and solve the corresponding problems existing in the prior art, the present invention proposes a grouting long-distance diffusion and consolidation performance testing device and method suitable for on-site use.

[0005] The advantages of the present invention are that the diffusion and consolidation performance parameters of the grouting slurry can be intuitively obtained, the grouting process can be simplified, the ground drilling workload can be reduced, and the grouting filling cost can be reduced.

[0006] The present invention provides the maximum proportion restoration and the most similar environment for on-site grouting diffusion and consolidation, and can meet the variability of the on-site environment, such as the length of the goaf, the inclination of the goaf floor, the height distance of the grouting hole from the goaf, etc., which provide references for the actual construction of the project. The present invention can adjust the angle of the device according to the different inclinations of the on-site goaf to simulate on-site grouting to the maximum extent.

[0007] A grouting long-distance diffusion consolidation performance testing device suitable for on-site use, comprising a grouting module, a flow module, a grouting body water separation and thickness monitoring module, a strength analysis module, and a hydraulic support; A grouting module pumping box and a slurry pump, the slurry pump is connected to a grouting pipe, and one end of the grouting pipe away from the slurry pump is arranged above the flow module through a height fixing ring; The flow module comprises a grouting slot having a number greater than or equal to one, wherein the grouting slot has a grouting slot bottom plate and two grouting slot side plates, the grouting slot side plates are provided with bolt holes, adjacent grouting slots are sealed and connected by metal plates with sealing gaskets and bolts, a plurality of metal blocking nets are arranged in the grouting slot, and gangue materials are arranged between the metal blocking nets; The lower side of the grouting slot bottom plate is connected with multiple hydraulic supports through steel plates, and the multiple hydraulic supports work together to adjust the inclination angle of the grouting slot; The grouting body water extraction and thickness monitoring module records the position and height information at different times during the slurry diffusion and consolidation process through a high-speed camera, and calculates the grouting body water extraction and thickness data through the back-end host connected to it; the strength analysis module takes cores from the slurry solidified body at the corresponding position after the slurry solidifies to measure its consolidation strength.

[0008] Furthermore, there are multiple height fixing rings, which are respectively located at different heights above the flow module, and the height of the grouting pipe outlet can be adjusted to simulate different heights of the grouting hole from the goaf; Furthermore, the grouting trough is a rectangular trough with a length of 1 meter, a width of 0.2 meters, and a height of 0.2 meters; Furthermore, scale lines are provided on the side walls of the grouting tank to accurately count the slurry flow during the experiment; Furthermore, a plurality of metal blocking nets are respectively fixed at predetermined positions of the grouting slot to divide the grouting slot into a plurality of different areas; A method for testing the long-distance diffusion consolidation performance of grouting applicable to the field, using the aforementioned long-distance diffusion consolidation performance testing device for grouting applicable to the field to test the diffusion consolidation performance of grouting slurry, further comprising: The slurry ratio is adjusted according to the actual situation. The mortar mixer is continuously stirred at a rotation speed of 200r / s to make the cement fly ash slurry have good fluidity. The prepared slurry is injected into the pumping box of the grouting module to maintain the stability of the slurry. The height of the grouting pipe is proportionally adjusted according to the actual situation on site. After the adjustment, it is fixed on the height fixing ring and kept at a certain height. It is placed on one side of the slurry flow trough. According to the actual situation on site of the goaf, the length, angle and metal blocking net of the slurry flow trough are checked. If the inspection is correct, the slurry is pumped into the flow module. Under the condition of pumping, the slurry flows to the top of the grouting pipe and then flows into the grouting trough by free fall.

[0009] Furthermore, the slurry consolidation strength measurement includes, after the grouting experiment is completed, when the slurry solidifies, sampling of the slurry solidified body at different distances is carried out, and mechanical properties tests are carried out for 3 days, 7 days, 14 days, 21 days, and 28 days to analyze the changes in the strength and deformation characteristics of the slurry solidified body in different areas.

[0010] The slurry ratio in the present invention can be selected from slurries with a weight water-cement ratio of 0.9, 1.0, or 1.1 and a cement:fly ash weight ratio of 5:5. Of course, slurries with different water-cement ratios and different cement:fly ash weight ratios can also be prepared according to actual conditions.

[0011] In the present invention, adjacent grouting grooves are sealed and connected by metal plates with sealing gaskets and bolts, which not only meets the requirements of device sealing, but also effectively prevents slurry leakage, ensuring stability and sealing during the experiment. At the same time, the metal plates with sealing gaskets and bolts that seal adjacent grouting grooves can also make it possible to flexibly adjust the number of grouting grooves according to experimental requirements to form slurry flow systems with different lengths.

[0012] In the present invention, the metal grid is fixed at a predetermined position to divide the grouting slot into a plurality of different areas. The metal grid is mainly used to limit the displacement of the gangue in the gangue collapse area in the goaf with an inclined angle. The metal grid effectively controls the movement of the gangue under the force through physical isolation, thereby simulating the injection body conditions of different partitions during the grouting process.

[0013] The present invention can adjust the angle of the grouting groove according to the actual situation on site through the steel plate connected to the hydraulic support. During the grouting process, the grouting height is adjusted according to the actual situation on site through the height fixing ring. The slurry flows into the grouting groove through the grouting pipe. Therefore, the device has high adaptability and reliability, and can provide effective support for the research on fluidity and grouting technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the grouting long-distance diffusion consolidation performance test device Figure 2 Schematic diagram of the structure of the grouting long-distance diffusion consolidation performance test device after angle adjustment Figure 3 Schematic diagram of the grouting slot connection structure of the grouting long-distance diffusion consolidation performance test device Figure 4 Schematic diagram of the structure of a plastic pad with a flange In the figure, 1-grouting module, 2-flow module, 3-grouting body water analysis and thickness monitoring module, 4-strength analysis module, 5-grouting pipe, 6-height fixing ring, 7-metal plate with sealing gasket, 8-steel plate, 9-hydraulic support, 10-metal grid, 11-grouting trough bottom plate, 12-grouting trough side plate, 13-bolt hole, 14-bolt. DETAILED DESCRIPTION

[0015] In order to timely and intuitively grasp the diffusion and consolidation performance parameters of grouting slurry and solve the corresponding problems existing in the prior art, the present invention proposes a grouting long-distance diffusion and consolidation performance testing device and method suitable for on-site use.

[0016] The advantage of the present invention is that it can intuitively obtain the diffusion and consolidation performance parameters of the grouting slurry, simplify the grouting process, reduce the amount of ground drilling engineering, and reduce the cost of grouting filling. The present invention provides the maximum proportion restoration and the most similar environment for on-site slurry grouting diffusion and consolidation, and can meet the variability of the on-site environment, such as the length of the goaf, the inclination of the bottom plate of the goaf, the height distance of the grouting hole from the goaf, etc., which provide a reference for the actual construction of the project. The present invention can adjust the angle of the device according to the different inclinations of the on-site goaf to simulate on-site grouting to the maximum extent. Now combined with the attached Figure 1-4 The present invention will be described in detail.

[0017] A grouting long-distance diffusion consolidation performance testing device suitable for on-site use, comprising a grouting module 1, a flow module 2, a grouting body water separation and thickness monitoring module 3, a strength analysis module 4, and a hydraulic support 9; The grouting module 1 has a pumping box and a slurry pump, the slurry pump is connected to a grouting pipe 5, and one end of the grouting pipe 5 away from the slurry pump is arranged above the flow module 2 through a height fixing ring 6; The flow module 2 includes a grouting trough having a number greater than or equal to one, the grouting trough having a grouting trough bottom plate 11, two grouting trough side plates 12, the grouting trough side plates 12 having bolt holes 13, adjacent grouting troughs are sealed and connected by metal plates 7 with sealing gaskets and bolts 14, a plurality of metal blocking nets 10 are arranged in the grouting trough, and gangue materials are arranged between the metal blocking nets 10; The lower side of the grouting slot bottom plate 11 is connected with a plurality of hydraulic supports 9 through a steel plate, and the plurality of hydraulic supports 9 work together to adjust the inclination angle of the grouting slot; The grouting body water extraction and thickness monitoring module 3 records the position and height information at different times during the slurry diffusion and consolidation process through a high-speed camera, and calculates the grouting body water extraction and thickness data through the back-end host connected to it; the strength analysis module 4 takes cores from the slurry solidified body at the corresponding position after the slurry solidifies, and measures its consolidation strength.

[0018] In a specific embodiment, there are multiple height fixing rings 6, which are respectively located at different heights above the flow module 2, and the height of the grouting pipe 5 outlet can be adjusted to simulate different heights of the grouting hole from the goaf; In a specific embodiment, the grouting trough is a rectangular trough with a length of 1 meter, a width of 0.2 meters, and a height of 0.2 meters; In a specific embodiment, scale lines are provided on the side wall of the grouting tank so as to accurately count the slurry flow during the experiment; In a specific embodiment, a plurality of metal blocking nets 10 are respectively fixed at predetermined positions of the grouting slot to divide the grouting slot into a plurality of different areas; A method for testing the long-distance diffusion consolidation performance of grouting applicable to the field, using the aforementioned long-distance diffusion consolidation performance testing device for grouting applicable to the field to test the diffusion consolidation performance of grouting slurry, further comprising: The slurry ratio is adjusted according to the actual situation. The mortar mixer is continuously stirred at a rotation speed of 200r / s to make the cement fly ash slurry have good fluidity. The prepared slurry is injected into the pumping box of the grouting module 1 to maintain the stability of the slurry. The height of the grouting pipe is proportionally adjusted according to the actual situation on site. After the adjustment, it is fixed on the height fixing ring and kept at a certain height. It is placed on one side of the slurry flow trough. According to the actual situation on site of the goaf, the length, angle and metal blocking net of the slurry flow trough are checked. If the inspection is correct, the slurry is pumped into the flow module. Under the condition of pumping, the slurry flows to the top of the grouting pipe and then flows into the grouting trough by free fall.

[0019] In a specific embodiment, the slurry consolidation strength measurement includes, after the grouting experiment is completed, waiting for the slurry to solidify, sampling the slurry solidified body at different distances, conducting mechanical property tests for 3 days, 7 days, 14 days, 21 days, and 28 days, and analyzing the changes in the strength and deformation characteristics of the slurry solidified body in different areas.

[0020] The slurry ratio in the present invention can be selected from slurries with a weight water-cement ratio of 0.9, 1.0, or 1.1 and a cement:fly ash weight ratio of 5:5. Of course, slurries with different water-cement ratios and different cement:fly ash weight ratios can also be prepared according to actual conditions.

[0021] In the present invention, adjacent grouting grooves are sealed and connected by metal plates with sealing gaskets and bolts, which not only meets the requirements of device sealing, but also effectively prevents slurry leakage, ensuring stability and sealing during the experiment. At the same time, the metal plates with sealing gaskets and bolts that seal adjacent grouting grooves can also make it possible to flexibly adjust the number of grouting grooves according to experimental requirements to form slurry flow systems with different lengths.

[0022] In the present invention, the metal grid is fixed at a predetermined position to divide the grouting slot into a plurality of different areas. The metal grid is mainly used to limit the displacement of the gangue in the gangue collapse area in the goaf with an inclined angle. The metal grid effectively controls the movement of the gangue under the force through physical isolation, thereby simulating the injection body conditions of different partitions during the grouting process.

[0023] The present invention can adjust the angle of the grouting groove according to the actual situation on site through the steel plate connected to the hydraulic support. During the grouting process, the grouting height is adjusted according to the actual situation on site through the height fixing ring. The slurry flows into the grouting groove through the grouting pipe. Therefore, the device has high adaptability and reliability, and can provide effective support for the research on fluidity and grouting technology.

Claims

1. A grouting long-distance diffusion consolidation performance testing device suitable for on-site use, characterized in that: It includes grouting module, flow module, grouting body water separation and thickness monitoring module, strength analysis module and hydraulic support; A grouting module pumping box and a slurry pump, the slurry pump is connected to a grouting pipe, and one end of the grouting pipe away from the slurry pump is arranged above the flow module through a height fixing ring; The flow module comprises a grouting slot having a number greater than or equal to one, wherein the grouting slot has a grouting slot bottom plate and two grouting slot side plates, the grouting slot side plates are provided with bolt holes, adjacent grouting slots are sealed and connected by metal plates with sealing gaskets and bolts, a plurality of metal blocking nets are arranged in the grouting slot, and gangue materials are arranged between the metal blocking nets; The lower side of the grouting slot bottom plate is connected with multiple hydraulic supports through steel plates, and the multiple hydraulic supports work together to adjust the inclination angle of the grouting slot; The grouting body water extraction and thickness monitoring module records the position and height information at different times during the slurry diffusion and consolidation process through a high-speed camera, and calculates the grouting body water extraction and thickness data through the back-end host connected to it; the strength analysis module takes cores from the slurry solidified body at the corresponding position after the slurry solidifies to measure its consolidation strength.

2. A grouting long-distance diffusion consolidation performance testing device suitable for on-site use according to claim 1, characterized in that: There are multiple height fixing rings, which are located at different heights above the flow module. The height of the grouting pipe outlet can be adjusted to simulate different heights of the grouting hole from the goaf.

3. A grouting long-distance diffusion consolidation performance testing device suitable for on-site use according to claim 1, characterized in that: The grouting trough is a rectangular trough with a length of 1 meter, a width of 0.2 meters and a height of 0.2 meters.

4. A grouting long-distance diffusion consolidation performance testing device suitable for on-site use according to claim 1, characterized in that: Scale lines are provided on the side walls of the grouting trough to enable accurate counting of the slurry flow during the experiment.

5. A grouting long-distance diffusion consolidation performance testing device suitable for on-site use according to claim 1, characterized in that: A plurality of metal blocking nets are respectively fixed at predetermined positions of the grouting trough to divide the grouting trough into a plurality of different areas.

6. A method for testing the long-distance diffusion consolidation performance of grouting suitable for on-site use, characterized in that: The diffusion consolidation performance of the grouting slurry is tested by using the grouting long-distance diffusion consolidation performance testing device suitable for on-site use as described in any one of claims 1 to 5, and further comprising: The slurry ratio is adjusted according to the actual situation. The mortar mixer is continuously stirred at a rotation speed of 200r / s to make the cement fly ash slurry have good fluidity. The prepared slurry is injected into the pumping box of the grouting module to maintain the stability of the slurry. The height of the grouting pipe is proportionally adjusted according to the actual situation on site. After the adjustment, it is fixed on the height fixing ring and kept at a certain height. It is placed on one side of the slurry flow trough. According to the actual situation on site of the goaf, the length, angle and metal blocking net of the slurry flow trough are checked. If the inspection is correct, the slurry is pumped into the flow module. Under the condition of pumping, the slurry flows to the top of the grouting pipe and then flows into the grouting trough by free fall.

7. A method for testing the long-distance diffusion consolidation performance of grouting suitable for on-site use according to claim 6, characterized in that: The slurry consolidation strength measurement includes, after the grouting experiment is completed, waiting for the slurry to solidify, sampling the slurry solidified body at different distances, and conducting mechanical property tests for 3 days, 7 days, 14 days, 21 days, and 28 days, and analyzing the changes in the strength and deformation characteristics of the slurry solidified body in different areas.

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