Testing device for measuring seepage-proofing effect of underwater grouting of high-permeability stratum
By designing a test device to determine the anti-seepage effect of underwater grouting in high-permeable formations, the problem of difficult to determine the grouting construction parameters and difficult to evaluate the anti-seepage effect in high-permeable formations is solved, real-time observation and quantitative evaluation of the grouting process are achieved, and the grouting effect is improved.
Patent Information
- Application Number
- CN202421822820.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-30
AI Technical Summary
When underwater grouting is carried out in a highly permeable formation, it is difficult to intuitively describe the diffusion process and rules of the slurry, and the grouting slurry is affected by groundwater and the diffusion form is complex, which makes it difficult to determine the construction parameters and the anti-seepage effect difficult to achieve expectations.
A test device for determining the anti-seepage effect of underwater grouting in high permeable formations is designed, including a grouting system, a data monitoring system and a water supply system. The device simulates the formation through the model box, uses the grouting system to inject slurry, the data monitoring system records construction parameters in real time, the water flow supply system simulates the formation water pressure, and observes the slurry diffusion and solidification process.
The device can observe the flow, filling, displacement and solidification process of the slurry in the highly permeable formation in real time, and quantitatively observe the grouting process, help evaluate the grouting effect, determine key construction control factors, and improve the permeability of grouting reinforcement.
Smart Images
Figure CN222938947U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underwater grouting anti-seepage, in particular to a test device for measuring the anti-seepage effect of underwater grouting in high-permeability strata. Background Art
[0002] The embankments of major rivers such as the Fuchun River, Qiantang River and Yangtze River (Wuhan section) are mostly highly permeable strata such as sand and gravel. The sand and gravel strata along the river and the river have the characteristics of large particle size, poor particle uniformity, strong permeability, high water content, large local pressure head, and high water pressure. During the flood season of rivers, the water level rises rapidly, and the river water is connected with the groundwater of the embankment, causing leakage, gushing and flooding of the embankment and the communities, factories and roads it protects. With the upgrading and transformation of water conservancy projects across the country, the existing important river bank embankments need to improve the standards of moisture and flood prevention, so it is necessary to grout the existing embankments on highly permeable strata to reduce the permeability of the embankment strata and prevent the surface water of the river from penetrating the embankment strata to cause pipe burst damage and flood disasters.
[0003] At present, the grouting and anti-seepage of highly permeable strata of riverbank embankments mostly adopts the method of drilling holes and pressing cement-based slurry into the strata from bottom to top. The slurry seeps and diffuses in the highly permeable strata, displacing the pore water in the stratum soil. After the slurry solidifies, cement reinforced soil is formed, which significantly reduces the permeability of the soil. Unlike conventional dry environments, when grouting in water-rich strata, engineering problems such as poor cement slurry molding quality and unsatisfactory anti-seepage effect are prone to occur. And as the grouting depth increases, the greater the formation water pressure, the more prominent the above engineering problems are. During the grouting construction at the project site, the cement slurry ratio, grouting process, grouting pressure, etc. are key construction control factors, which directly determine the grouting effects such as the slurry diffusion range and the permeability of the grouting reinforcement.
[0004] However, since underwater grouting is a concealed project, the diffusion process and law of slurry in water-rich sand and gravel formations are difficult to describe intuitively, and the grouting slurry is affected by groundwater, and the diffusion form of the slurry is extremely complex. In order to determine the above grouting construction parameters, a simulated grouting experiment is required. Utility Model Content
[0005] The utility model aims to overcome the shortcomings of the above-mentioned background technology and provide a test device for measuring the anti-seepage effect of underwater grouting in high-permeability strata.
[0006] The technical solution adopted by the utility model is as follows:
[0007] A test device for determining the anti-seepage effect of underwater grouting in highly permeable strata, comprising a grouting system, a data monitoring system and a dynamic water supply system;
[0008] The grouting system includes a model box, a grouting bucket, and a first air compressor; the model box is a sealed structure with at least one transparent side wall, filled with a formation simulation material inside. On the inner side of the transparent side wall at the upper part of the model box, there is a grouting duct, and a grouting hole is arranged at the upper end of the grouting duct. A water injection hole is opened at the lower part of the model box; the outlet of the first air compressor is connected to the pressurization hole of the grouting bucket through a first pressurization pipeline, and the grouting hole of the grouting bucket is connected to the grouting hole through a grouting pipeline.
[0009] The data monitoring system includes a host computer, a pressure gauge, a flowmeter, and a PIV flow field measurement system. The pressure gauge and the flowmeter are arranged on the grouting pipeline and electrically connected to the host computer. The camera of the PIV flow field measurement system is arranged facing the side wall of the model box where the grouting duct is located.
[0010] The dynamic water supply system includes a water tank and a second air compressor. The water tank is a sealed structure, and its upper part is connected to the outlet of the second air compressor through a second pressurization pipeline. The water outlet hole at the lower part of the water tank is connected to the water injection hole at the lower part of the model box through a water injection pipe.
[0011] In a further embodiment, the model box is a hollow semi-cylindrical shape with a closed bottom and an open top, and is made of transparent plates as a whole to facilitate observing the diffusion movement of the grout. The hollow part forms a cavity for accommodating the formation simulation material. After the formation simulation material is filled, the open top of the model box is closed by a top plate, and the top plate is fixedly connected to the edge of the open top and sealed with a gasket.
[0012] In a further embodiment, the grouting duct is located on the inner wall of the vertical plane of the semi-cylindrical model box, arranged along the center line of the vertical plane and extending downward from the top of the model box for a certain distance.
[0013] In a further embodiment, the inner cavity size of the model box corresponds to the single-hole burden area of the grouting hole at the construction site.
[0014] In a further embodiment, the top plate is a semi-circular shape with a radius of 830 mm, the model box is a hollow semi-cylinder with a radius of 750 mm and a wall thickness of 20 mm, and a water injection hole with a diameter of 60 mm is opened at the lower end of the model box.
[0015] In a further embodiment, pressure regulating valves for controlling pressure are equipped at the outlets of both the first air compressor and the second air compressor.
[0016] In a further embodiment, a grouting valve is provided on the first pressurization pipeline.
[0017] In a further embodiment, in the grouting system, the grouting pipeline is a reinforced pumping pipe with a pressure resistance of more than 10 MPa.
[0018] In a further embodiment, in the dynamic water supply system, the water injection pipe is a transparent steel wire spiral reinforced hose with a pressure resistance of more than 4 MPa.
[0019] In a further embodiment, the water tank is of a transparent structure.
[0020] The beneficial effects of the present utility model are as follows: The present utility model can simulate underwater grouting in a highly permeable formation and measure its anti-seepage effect. This device can control the formation water pressure, slurry pressure, and slurry injection volume, can observe in real time the processes of slurry flow, filling, displacement, and solidification in the highly permeable formation, and can measure the permeability coefficient of the grouted body by water pressure injection, thereby quantitatively observing the grouting process, facilitating manual evaluation of the grouting effect, determining key construction control factors such as the cement slurry ratio, grouting process, and grouting pressure during underwater grouting construction in a highly permeable formation, and quantitatively evaluating the permeability performance of the grouted solid. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic structural diagram of the system according to an embodiment of the present utility model.
[0022] Figure 2 It is a schematic top view structural diagram of the model box in an embodiment of the present utility model.
[0023] Figure 3 It is a schematic position structural diagram of the grouting hole in an embodiment of the present utility model.
[0024] Figure 4 It is a schematic connection structural diagram of the grouting barrel and the first air compressor in an embodiment of the present utility model.
[0025] Figure 5 It is a schematic position structural diagram of the pressure adding hole of the water tank in an embodiment of the present utility model.
[0026] Figure 6 It is a schematic position structural diagram of the water outlet hole of the water tank in an embodiment of the present utility model.
[0027] In the figure: First air compressor 1, air pressure regulating valve 2, grouting barrel 3, pressure gauge 4, flow meter 5, upper computer 6, camera 7, model box 8, grouting hole 9, bolt hole 10, water outlet hole 11, water tank 12, second pressure adding hole 13, grouting valve 14, first pressure adding hole 15, bolt 16, grouting hole 17, second air compressor 18, grouting hole channel 19, top plate 20. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] To make the purpose, technical solutions, and advantages of the present utility model clearer to those of ordinary skill in the art, the following further elaborates the present utility model in conjunction with the accompanying drawings and embodiments, but the present utility model is not limited to the following embodiments.
[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0030] As Figure 1 shown, the test device for measuring the underwater grouting anti-seepage effect of highly permeable formations provided in this embodiment includes a grouting system, a data monitoring system, and a dynamic water supply system.
[0031] The grouting system includes a model box 8, a first air compressor 1, a mixer, a pneumatic pressure regulating valve 2, a grouting pipeline, and a grouting bucket 3. The mixer is used to fully stir the slurry in the grouting bucket 3. After stirring evenly, the grouting bucket 3 is sealed. As Figure 4 shown, the outlet of the first air compressor 1 is connected to the first pressurizing hole 15 at the top of the grouting bucket 3 through a first pressurizing pipeline. A grouting valve 14 is provided on the first pressurizing pipeline. A grouting hole 17 is provided at the bottom of the grouting bucket 3. The grouting hole 17 is connected to the grouting hole 9 at the top of the model box 8 through a grouting pipeline. The top plate of the grouting bucket 3 and the top of the bucket wall are connected by bolts 16 and sealed by a rubber gasket. The grouting pressure of the entire grouting system is controlled by the pneumatic pressure regulating valve 2 equipped at the outlet of the first air compressor 1. During grouting, the prepared slurry is injected from the grouting bucket 3 into the grouting hole 9 of the model box 8, and the grouting pressure is slowly increased. When the slurry is about to spread to the water tank 12, the grouting is stopped.
[0032] As Figure 1 , 2 , 3 shown, the main body of the model box 8 is a semi-cylindrical hollow structure, closed at the bottom and open at the top. A top plate 20 is provided at the open part. The semi-cylindrical main body of the model box 8 is assembled with transparent material acrylic plates, and a rigid curing type sealant is applied at the joints. The top plate 20 can also be made of transparent material acrylic plate, which is convenient for observing the slurry diffusion movement. After filling the model box 8 with formation simulation material (sand gravel soil), a layer of rubber gasket is installed at the upper open part, and the top plate 20 is covered at the open part for sealing. Bolt holes 10 are provided at the edge of the open part, and the top plate 20 is fastened to the open part of the model box 8 with bolts 16 to ensure that the injected water and slurry will not overflow from the connection.
[0033] The top plate 20 is a semi - circle with a radius of 830 mm, and screw holes with a radius of 20 mm are opened 30 mm inward from the edge. The distance between holes is 75 mm, which can strictly ensure good airtightness. The main body of the model box 8 is a semi - cylinder with a length of 750 mm and a wall thickness of 20 mm. The size of the model box 8 corresponds to the single - hole burden area of the on - site grouting hole 9. The inner cavity of the model box 8 is also semi - cylindrical. The top plate 20 is provided with a grouting hole 9 at the position corresponding to the center of the inner cavity. The inner wall of the vertical plane of the semi - cylindrical model box 8 is provided with a grouting hole channel 19 (made of transparent material, such as acrylic). The grouting hole channel 19 is arranged along the mid - line of the vertical plane (close to the center of the inner cavity) and extends vertically downward from the top of the model box 8 for a certain distance. This distance is determined according to the specific situation of grouting, usually extending to the middle position of the model box 8. The grouting hole channel 19 is a semi - circular channel and is connected to the grouting hole 9 on the top plate 20. A water injection hole with a diameter of 60 mm is also opened at the lower end of the model box 8.
[0034] The data monitoring system includes a pressure gauge 4, a flowmeter 5, and a PIV flow field measurement system (the PIV flow field measurement system is a prior art). The pressure gauge 4 and the flowmeter 5 are placed on the grouting pipeline and are connected to the upper computer 6 through electronic circuits to record the grouting construction parameters in real - time. At the same time, the PIV flow field measurement system is used to record the changes of parameters such as the pressure of the grout over time and the change of the diffusion range of the grout. The camera 7 of the PIV flow field measurement system is placed on the side of the model box 8 where there is the grouting hole channel 19, that is, facing the vertical plane of the semi - cylinder, and can observe the processes of grout diffusion, displacement, and solidification in real - time.
[0035] As Figure 1 、 Figure 5 、 Figure 6 shown, the dynamic water supply system includes a water tank 12, a second air compressor 18, and a water injection pipe. The water tank 12 is arranged on the side of the model box 8. The water injection pipe is used to connect the water outlet hole 11 at the bottom of the water tank 12 and the water injection hole at the bottom of the model box 8. The top of the water tank 12 is connected to the outlet of the second air compressor 18 through a second pressurized pipeline. The outlet of the second air compressor 18 is equipped with a pneumatic pressure regulating valve 2 for controlling pressure. The water tank 12 is a square sealed structure with a size of 750 mm and a height of 750 mm, and is made of transparent acrylic board. The dynamic water supply system intakes water from the bottom of the model box 8. Both the model box 8 and the water tank 12 are sealed structures, and the required formation water pressure can be accurately controlled by controlling the water level in the water tank 12 and the power of the second air compressor 18.
[0036] The first pressurized pipeline and the grouting pipeline of the grouting system are reinforced pumping pipes with a pressure resistance of more than 10 MPa, and the second pressurized pipeline and the water injection pipe of the dynamic water supply system are transparent steel wire spiral reinforced hoses with a pressure resistance of more than 4 MPa.
[0037] First, the highly pervious formation soil samples transported from the site are screened to select sand-gravel soil with a particle size of 10 - 50 mm. After the screening is completed, it is placed into the open grouting model box 8.
[0038] At the open end of the model box 8, an acrylic board is used as the top plate 20, and a layer of rubber gasket is placed. The top plate 20 is covered on the open end of the model box 8 for sealing, and finally tightened and fixed with bolts 16; the rubber gasket is clamped between the acrylic boards to increase the waterproof sealability, and a rigid curing type sealant is applied at the joints of each acrylic board of the model box 8 to ensure that the injected water and slurry will not overflow from the joints.
[0039] Prepare a dynamic water supply system. Connect the dynamic water supply system to the water injection port at the lower part of the model box 8 through a water injection pipe, and inject water into the model box 8; during this process, control the hydrostatic pressure by compressing the gas in the water tank 12 with the second air compressor 18. In addition, the water surface height in the water tank 12 at the beginning can also be controlled to simulate the dynamic water conditions with different water pressures and flow rates under different water environments.
[0040] Prepare a grouting system. Connect the grouting hole 17 and the grouting hole 9 through a grouting pipeline, and inject the prepared slurry into the grouting hole 9 in the model box 8 of the grouting model system. Slowly increase the grouting pressure upwards. When the slurry is about to spread to the water tank 12, stop grouting.
[0041] During grouting, connect the pressure gauge 4 and the flowmeter 5 to the upper computer 6 to record the grouting construction parameters in real time. At the same time, use the PIV flow field measurement system to record the changes of parameters such as the slurry pressure and time, and the change of the slurry diffusion range.
[0042] The above are only the preferred embodiments of the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A test device for measuring the anti-seepage effect of underwater grouting in highly permeable formations, characterized by: Including grouting system, data monitoring system and dynamic water supply system; The grouting system comprises a model box (8), a grouting barrel (3) and a first air compressor (1); the model box (8) is a sealed structure with at least one transparent side wall, and is filled with a formation simulation material; a grouting channel (19) is provided on the inner side of the transparent side wall of the upper part of the model box (8); a grouting hole (9) is provided at the upper end of the grouting channel (19); and a water injection hole is provided at the lower part of the model box (8); the outlet of the first air compressor (1) is connected to the pressurized hole of the grouting barrel (3) through a first pressurized pipe, and the grouting hole (17) of the grouting barrel (3) is connected to the grouting hole (9) through a grouting pipe; The data monitoring system comprises a host computer (6), a pressure gauge (4), a flow meter (5) and a PIV flow field measurement system. The pressure gauge (4) and the flow meter (5) are arranged on the grouting pipeline and are electrically connected to the host computer (6). The camera (7) of the PIV flow field measurement system is arranged facing the side wall of the model box (8) provided with the grouting channel (19); The dynamic water supply system comprises a water tank (12) and a second air compressor (18); the water tank (12) is a sealed structure, the upper part of which is connected to the outlet of the second air compressor (18) via a second pressurized pipe, and the water outlet at the lower part of the water tank (12) is connected to the water injection hole at the lower part of the model box (8) via a water injection pipe.
2. A test device for determining the anti-seepage effect of underwater grouting in highly permeable strata according to claim 1, characterized in that: The model box (8) is hollow with a closed bottom and an open top, and is made entirely of a transparent plate to facilitate observation of the diffusion movement of the slurry. The hollow portion forms a cavity for accommodating the formation simulation material. After the formation simulation material is filled, the opening at the top of the model box (8) is closed by a top plate (20), and the top plate (20) is fixedly connected to the edge of the opening and sealed by a sealing gasket.
3. A test device for determining the anti-seepage effect of underwater grouting in high permeability formations according to claim 2, characterized in that: The grouting channel (19) is located on the inner wall of the vertical plane of the semi-cylindrical model box (8), arranged along the center line of the vertical plane and extending downward from the top of the model box (8) for a distance.
4. A test device for determining the anti-seepage effect of underwater grouting in highly permeable strata according to claim 2, characterized in that: The inner cavity size of the model box (8) corresponds to the single hole burden area of the grouting hole (9) at the construction site.
5. A test device for determining the anti-seepage effect of underwater grouting in highly permeable strata according to claim 4, characterized in that: The top plate (20) is a semicircle with a radius of 830 mm, the model box (8) is a hollow semi-cylinder with a radius of 750 mm and a wall thickness of 20 mm, and a water injection hole with a diameter of 60 mm is opened at the lower end of the model box (8).
6. A test device for determining the anti-seepage effect of underwater grouting in highly permeable strata according to claim 1, characterized in that: The outlet of the first air compressor (1) and the outlet of the second air compressor (18) are both equipped with an air pressure regulating valve (2) for controlling the pressure.
7. The test device for determining the anti-seepage effect of underwater grouting in high permeability formations according to claim 1, characterized in that: The first pressurized pipeline is provided with a grouting valve (14).
8. A test device for determining the anti-seepage effect of underwater grouting in high permeability formations according to any one of claims 1 to 7, characterized in that: In the grouting system, the grouting pipeline is a reinforced pumping pipe with a pressure resistance of more than 10 MPa.
9. A test device for determining the anti-seepage effect of underwater grouting in high permeability formations according to any one of claims 1 to 7, characterized in that: In the dynamic water supply system, the water injection pipe is a transparent steel wire spiral reinforced hose with a pressure resistance of more than 4 MPa.
10. A test device for determining the anti-seepage effect of underwater grouting in high permeability formations according to any one of claims 1 to 7, characterized in that: The water tank (12) is a transparent structure.