Full-scale test device for contact scouring damage and grouting repair of embankment-penetrating pressure pipe culvert and construction method

Abstract

The invention relates to a full-scale test device for contact scouring damage and grouting repair of an embankment-penetrating pressure pipe culvert and a construction method, and belongs to the field of embankment scouring damage simulation and grouting repair. The concrete pipe culvert is embedded in the lower portion of a dam, two leakage holes are preset in the concrete pipe culvert in the radial direction, and leakage devices are installed on the leakage holes. The leakage device comprises four sets of filter assemblies, two sets of flow acquisition modules, four sets of flow velocity acquisition modules and two sets of three-way pipes; each set of filter assembly comprises a filter screen and a screw rod; each set of three-way pipe is divided into an inlet and two outlets, each set of filtering assembly is tightly connected with the outlet through a screw rod, the inlet of each set of three-way pipe is connected with one end of a grouting pipe or a water injection pipe, and the other end of each set of three-way pipe is connected with a water injection device and grouting equipment; sensors are arranged on the plane where the central axis of the concrete pipe culvert is located from top to bottom. According to the full-scale test model for contact scouring damage and grouting repair of the dike-penetrating pressure pipe culvert and the construction method, the test cost can be reduced, the field dependence can be reduced, and the test working condition can be controlled.

Description

Technical Field

[0001] The invention relates to the field of scouring damage simulation and grouting repair of dikes, and in particular to a full-scale test model and a construction method for simulating contact scouring damage and grouting repair of a pressurized pipe culvert penetrating a dike. Background Art

[0002] The through-dike culvert is an important structure for drainage and water storage of the dam. It allows water to flow through the inside of the dam, ensuring the integrity and safety of the dam during the high water level operation period. The through-dike culvert is often buried at the bottom of the dam and is a high-buried and deep drainage and water storage structure. The through-dike culvert is widely used in water conservancy projects due to its advantages such as short construction period and low cost. According to different application scenarios, the through-dike culvert is usually divided into two types: pressurized pipe and non-pressurized pipe. Among them, the pressurized pipe has low structural durability and safety due to the high pressure inside, so it needs to be studied and protected.

[0003] The pressurized pipe not only needs to bear the deadweight of the overlying soil and the additional load on the surface, but also needs to bear the pressure inside the pipe. The use environment is very complex. Under such high-load operating conditions, the negative impact of uneven settlement of the soil around the pipe will be particularly obvious. With the gradual development of uneven settlement, the dominant seepage channel of the pipe-soil interface will continue to expand, and the soil load borne by the pipe will continue to increase. In addition, the aging of the culvert material makes it very easy for the inner and outer walls of the culvert to fall off, crack or even have holes. Once the holes in the pipe body are generated, the water flow inside the pressurized pipe culvert will flow into the dam at a very high speed under the action of high pressure, causing the soil around the pipe to be quickly saturated and the shear strength of the soil to drop sharply. At the same time, the scouring of high-pressure water will also cause cavities and cracks inside the dam, further increasing the uneven settlement of the dam, seriously endangering the safety of the dam and the pipeline.

[0004] At present, the research on culverts through dikes is mostly focused on indoor model tests. However, due to the scale effect, model tests are often difficult to accurately reflect the actual situation of the project. In addition, model tests mostly use similar materials, which further increases the test error. Since the size of the full-scale test is close to the actual engineering structure, and the selected test materials are also completely based on the construction standards, the measured data is more real and reliable, and more instructive for engineering applications. However, the full-scale test cannot be repeated, the workload is large, the cycle is long, it is obviously restricted by site conditions, and some test variables are uncontrollable. In view of the above problems, it is necessary to develop a full-scale test model that can reduce the test workload, increase the controllability of the test, and reduce site dependence. The invention provides a full-scale test model for contact scouring damage and grouting repair of a pressurized culvert through a dike. The test model can simulate different pipeline leakage pressures through a built-in leakage device, and can also avoid drilling holes in the dike body in the grouting repair test, effectively reducing the workload of the full-scale test. In addition, since the present invention adopts the method of placing a catheter inside the pipeline, compared with laying out a grouting pipe and a water injection pipe outside the pipeline, it can reduce the impact of the test device on the seepage field of the dam, making the test data more reliable. Summary of the invention

[0005] In response to the problems existing in the existing full-scale tests on contact scouring damage and grouting repair of pressurized pipe culverts through dikes, the present application provides a full-scale test model and construction method for contact scouring damage and grouting repair of pressurized pipe culverts through dikes, which can reduce test costs, reduce site dependence and have controllable test conditions.

[0006] The technical solution of the present invention:

[0007] A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike, comprising a dike 1, a concrete pipe culvert 2, a conduit 3, a leakage hole 9, a water injection pipe 10, a grouting pipe 11, a grouting device 12, a water injection device 13 and a sensor 15. The concrete pipe culvert 2 is buried in the lower part of the dike 1, and two leakage holes 9 are radially preset on the concrete pipe culvert 2, and a leakage device 21 is installed on the leakage hole 9; the leakage device 21 comprises four sets of filter components 4, two sets of flow acquisition modules 6, four sets of flow rate acquisition modules 5 and two sets of three-way pipes 20, each set of filter components 4 comprises a filter screen 16 and a screw 19; each set of the three-way pipes 20 is divided into an inlet 7 and two outlets 8, the flow acquisition module 6 is installed at the inlet 7, the flow rate acquisition module 5 is installed at the outlet 8, each set of the filter components 4 is tightly connected to the outlet 8 through a screw 19, the outlet 8 is tightly fitted with the leakage hole 9, and the outlet 8 is axially aligned with the filter screen 16 in the filter component 4. The surface is vertical, and the inlet 7 on each set of three-way pipes 20 is respectively connected to one end of the grouting pipe 11 or the water injection pipe 10. The grouting pipe 11 and the water injection pipe 10 are covered with a conduit 3 on the outside, and the other ends are respectively connected to the water injection equipment 13 and the grouting equipment 12; the water injection equipment 13 can adjust the water injection pressure in real time according to the flow acquisition module 6 to simulate different leakage conditions; sensors 15 are arranged from top to bottom on the plane where the central axis of the concrete culvert 2 is located, and the data changes of the sensors 15 for real-time monitoring of the pore pressure and soil pressure inside the dam 1 during the water injection process; the grouting equipment 12 can control the grouting amount through the flow acquisition module 6, and inject polymer into the dam 1 when the data of the sensor 15 reaches a certain value.

[0008] Furthermore, the concrete culvert 2 is parallel to the bottom surface of the dam 1 .

[0009] Furthermore, the inlet 7 on the tee pipe 20 is bonded to the water injection pipe 10 and the grouting pipe 11 by means of PVC-U water supply type adhesive.

[0010] Furthermore, the gap between the leakage device 21 and the leakage hole 9 is treated to be anti-seepage by applying sealing silicone.

[0011] Furthermore, the filter screen 16 in the filter assembly 4 has holes at four corners and is fixed by screws 14 on the holes.

[0012] Furthermore, the flow rate collection module 5 is pasted on the outlet of the three-way pipe 20 and fixed with a cable tie.

[0013] Furthermore, the flow collection module 6 is pasted on the inlet of the three-way pipe 20 and fixed with a cable tie.

[0014] Furthermore, the grouting pipe 11 and the water injection pipe 10 are placed in parallel in the conduit 3 .

[0015] Furthermore, the downstream outlet end of the concrete culvert 2 is blocked by a concrete plug 17 to form a downstream blocking section.

[0016] The construction method for contact scouring damage and grouting repair of a pressure pipe culvert through a dike comprises:

[0017] S1, drilling holes in the concrete culvert 2: drilling leakage holes 9 at preset leakage positions in the concrete culvert 2;

[0018] S2, filling of embankment 1: filling embankment 1 in layers, and compacting and scraping the surface of each layer of filling;

[0019] S3, placing concrete culvert 2: when the embankment 1 is filled to a specified height, a trench is dug to place the concrete culvert 2;

[0020] S4, installing the leakage device 21: connecting the grouting pipe 11 and the water injection pipe 10 to the inlet 7 of the corresponding tee pipe 20 respectively, pulling them from the inside of the concrete culvert 2 to the leakage hole 9 by a pulling rope, and then connecting the filter assembly 4 to the outlet 8 of the tee pipe 20 by a screw 19;

[0021] S5, sealing treatment: evenly apply sealing silica gel to the gap between the outlet 8 of the tee pipe 20 and the leakage hole 9;

[0022] S6, applying a concrete plug 17 at the downstream outlet of the concrete culvert 2, and repeating step S2;

[0023] S7, sensor burying: during the filling process of the dam 1, sensors 15 are buried at different horizontal planes;

[0024] S8. After the dam 1 model is built, water is stored upstream so that the interior of the concrete culvert 2 is filled with water to simulate the gravity of water;

[0025] S9, adjusting different water injection pressures to conduct a pressure pipe culvert leakage scouring test on the dam 1;

[0026] S10, real-time monitoring of the data changes of the flow acquisition module 6 and the flow velocity acquisition module 5 of the sensor 15 inside the dam 1, and when damage occurs inside the dam 1, starting the grouting equipment 12 to perform a grouting repair test on the dam 1;

[0027] S11. Based on the test data obtained, the development of scour damage of dam 1 and the effect of grouting repair are studied and analyzed.

[0028] In summary, the present application includes at least one of the following beneficial effects:

[0029] 1. It can simulate the contact scour damage in the full-scale test of the pressure pipe culvert through the dike, and avoid grouting drilling, effectively reducing the workload required for grouting repair;

[0030] 2. By adjusting the pressure of the water injection equipment and the water outlet position of the leakage device, different leakage conditions of the pressurized culvert can be simulated.

[0031] 3. It can reduce the requirements for site conditions and equipment, and scouring destruction can be achieved by using low-power water injection equipment.

[0032] 4. The leakage order of the leakage holes can be controlled to simulate more complex leakage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an overall schematic diagram of a full-scale test device and construction method for contact scour damage and grouting repair of a pressurized pipe culvert through a dike as described in this application;

[0034] Figure 2 It is a schematic diagram of a leakage device of a full-scale test device and construction method for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike as described in the present application;

[0035] Figure 3 It is a schematic diagram of a filter assembly of a full-scale test device and construction method for contact scour damage and grouting repair of a pressurized pipe culvert through a dike as described in the present application;

[0036] Figure 4 It is a schematic diagram of a conduit of a full-scale test device and construction method for contact scour damage and grouting repair of a pressurized pipe culvert through a dike as described in the present application;

[0037] Figure 5 It is a schematic diagram of a concrete pipe culvert of a full-scale test device and construction method for contact scour damage and grouting repair of a pressure pipe culvert through a dike as described in this application;

[0038] Figure 6 It is a flow chart of a full-scale test device and construction method for contact scour damage and grouting repair of a pressurized pipe culvert through a dike as described in this application;

[0039] In the figure: 1. dam; 2. concrete culvert; 3. conduit; 4. filter assembly; 5. velocity acquisition module; 6. flow acquisition module; 7. inlet; 8. outlet; 9. leakage hole; 10. water injection pipe; 11. grouting pipe; 12. grouting equipment; 13. water injection equipment; 14. screw; 15. sensor 16. filter; 17. concrete plug; 19. screw; 20. tee pipe; 21 leakage device. DETAILED DESCRIPTION

[0040] The following will further describe the test model and construction method in the embodiments of the present application in detail and in full with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Figure 1-6 .

[0041] The present embodiment provides a full-scale test model and construction method for simulating contact scouring damage and grouting repair of a pressurized pipe culvert through a dike, including a dike 1, a concrete pipe culvert 2, a conduit 3, a filter assembly 4, a velocity collection module 5, a flow collection module 6, an inlet 7, an outlet 8, a leakage hole 9, a water injection pipe 10, a grouting pipe 11, a grouting device 12, a water injection device 13, a screw 14, a sensor 15, a filter screen 16, a concrete plug 17, a screw 19, a tee 20, and a leakage device 21. A concrete pipe culvert 2 is provided at the bottom of the dike 1, and a leakage hole 9 is provided on the concrete pipe culvert 2. Three, five, and five sensors 15 are arranged from top to bottom on the plane where the central axis of the concrete pipe culvert 2 is located. A concrete plug 17 is provided at the downstream end of the concrete pipe culvert 2. A filter assembly 15 is provided on the leakage device 21. A filter screen 16 is installed in the filter assembly 15. Four screw holes are provided at the corresponding positions of the four corners of the filter screen 16. The filter assembly 15 and the tee 20 are connected by the screw 19. After connection, it is installed at the leakage hole 9, and the sealing silicone is used to prevent the seam from seeing through. The other end of the three-way pipe 20 on the leakage device 21 is connected to the grouting pipe 11 and the water injection pipe 10. The grouting pipe 10 and the water injection pipe 11 are covered with a conduit 3. The conduit 3 extends from the inside of the concrete culvert 2 to the leakage hole 9. The grouting equipment 12 and the water injection equipment 13 are respectively connected to the grouting pipe 11 and the water injection pipe 10 in the conduit 3, and polymer slurry and water are injected into the dam 1 through the leakage hole 9.

[0042] In this embodiment, the slope of the dam is 1:2, the dam top width is 4m, the dam height is 3m, the dam length is 16m, the dam body material is silt, the compaction degree is 0.95, and the leakage holes are set at the upper and lower parts of the middle section of the culvert. The viscosity of polymer slurry is often slightly greater than that of aqueous solution, so the aperture of the filter 16 installed in the filter assembly should be different. The aperture of the filter 16 installed at the grouting outlet should be slightly larger than that at the water injection outlet, to ensure that the slurry flows out smoothly while avoiding impurities in the soil blocking the outlet. The specific construction process is as follows:

[0043] S1, drilling holes in the concrete culvert 2: drilling leakage holes 9 at preset leakage positions in the concrete culvert 2;

[0044] S2, filling of embankment 1: filling embankment 1 in layers, and compacting and scraping the surface of each layer of filling;

[0045] S3, placing concrete culvert 2: when the embankment 1 is filled to a specified height, a trench is dug to place the concrete culvert 2;

[0046] S4, installing the leakage device 21: connecting the grouting pipe 11 and the water injection pipe 10 to the inlet 7 of the corresponding tee pipe 20 respectively, pulling them from the inside of the concrete culvert 2 to the leakage hole 9 by a pulling rope, and then connecting the filter assembly 4 to the outlet 8 of the tee pipe 20 by a screw 19;

[0047] S5, sealing treatment: evenly apply sealing silica gel to the gap between the outlet 8 of the tee pipe 20 and the leakage hole 9;

[0048] S6, applying a concrete plug 17 at the downstream outlet of the concrete culvert 2, and repeating step S2;

[0049] S7, sensor burial: during the embankment filling process, pore pressure and earth pressure sensors 15 are buried at the 0.4m, 1,4m, and 2.4m horizontal planes respectively;

[0050] S8. After the dam 1 model is built, water is stored upstream so that the interior of the concrete culvert 2 is filled with water to simulate the gravity of water;

[0051] S9, adjusting different water injection pressures to conduct a pressure pipe culvert leakage scouring test on the dam 1;

[0052] S10, real-time monitoring of the data changes of the flow acquisition module 6 and the flow velocity acquisition module 5 of the pore pressure and earth pressure sensor 15 inside the dam 1, and when damage occurs inside the dam 1, starting the grouting equipment 12 to perform a grouting repair test on the dam 1;

[0053] S11. Based on the test data obtained, the development of scour damage of dam 1 and the effect of grouting repair are studied and analyzed.

Claims

1. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike, characterized in that: The invention comprises a dam (1), a concrete pipe culvert (2), a conduit (3), a seepage hole (9), a water injection pipe (10), a grouting pipe (11), a grouting device (12), a water injection device (13) and a sensor (15); the concrete pipe culvert (2) is buried in the lower part of the dam (1); two seepage holes (9) are radially preset on the concrete pipe culvert (2); a seepage device (21) is installed on the seepage holes (9); the seepage device (21) comprises four sets of filtering components (4), Two sets of flow rate collection modules (6), four sets of flow rate collection modules (5) and two sets of three-way pipes (20), each set of filter components (4) comprises a filter screen (16) and a screw (19); each set of the three-way pipes (20) is divided into an inlet (7) and two outlets (8), the flow rate collection module (6) is installed on the inlet (7), the flow rate collection module (5) is installed on the outlet (8), and each set of the filter components (4) is tightly connected to the outlet (8) through the screw (19). The outlet (8) is tightly fitted with the leakage hole (9), and the outlet (8) is axially perpendicular to the mesh surface of the filter screen (16) in the filter assembly (4). The inlet (7) on each set of three-way pipes (20) is respectively connected to one end of a grouting pipe (11) or a water injection pipe (10). The grouting pipe (11) and the water injection pipe (10) are covered with a conduit (3) on the outside, and the other ends are respectively connected to a water injection device (13) and a grouting device (12); the water injection device (13) can adjust the water injection pressure in real time according to the flow acquisition module (6) to simulate different leakage conditions; sensors (15) are arranged from top to bottom on the plane where the central axis of the concrete culvert (2) is located, and the data changes of the sensors (15) for real-time monitoring of the pore pressure and soil pressure inside the dam (1) during the water injection process; the grouting device (12) can control the grouting amount through the flow acquisition module (6), and inject polymer into the dam (1) when the data of the sensor (15) reaches a certain value.

2. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The concrete culvert (2) is parallel to the bottom surface of the dam (1).

3. A full-scale test device for contact scour damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The inlet (7) on the three-way pipe (20) is bonded to the water injection pipe (10) and the grouting pipe (11) by means of PVC-U water supply type adhesive.

4. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The gap between the leakage device (21) and the leakage hole (9) is treated to prevent leakage by applying sealing silica gel.

5. A full-scale test device for contact scour damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The filter screen (16) in the filter assembly (4) has holes at four corners and is fixed by screws (14) on the holes.

6. A full-scale test device for contact scour damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The flow rate collection module (5) is pasted on the outlet of the three-way pipe (20) and fixed with a cable tie.

7. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The flow collection module (6) is pasted on the inlet of the three-way pipe (20) and fixed by tying with a cable tie.

8. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The grouting pipe (11) and the water injection pipe (10) are placed in parallel in the conduit (3).

9. A full-scale test device for contact scouring damage and grouting repair of a pressurized pipe culvert through a dike according to claim 1, characterized in that: The downstream outlet end of the concrete culvert (2) is blocked by a concrete plug (17) to form a downstream blocking section.

10. A construction method for contact scouring damage and grouting repair of a pressure pipe culvert through a dike, characterized in that: The method is implemented by using a full-scale test device for contact scour damage and grouting repair of a pressurized pipe culvert through a dike as described in any one of claims 1 to 9, and the steps include: S1, drilling holes in the concrete culvert (2): drilling leakage holes (9) at preset leakage positions of the concrete culvert (2); S2. Filling of the embankment (1): filling the embankment (1) in layers, and compacting and scraping the surface of each layer of filling soil; S3, placing a concrete culvert (2): when the embankment (1) is filled to a specified height, a trench is dug and a concrete culvert (2) is placed; S4, installing the leakage device (21): connecting the grouting pipe (11) and the water injection pipe (10) to the inlet (7) of the corresponding tee pipe (20), respectively, and pulling them from the inside of the concrete culvert (2) to the leakage hole (9) by a pulling rope, and then connecting the filter assembly (4) to the outlet (8) of the tee pipe (20) by a screw (19); S5, sealing treatment: evenly apply sealing silica gel to the gap between the outlet (8) of the three-way pipe (20) and the leakage hole (9); S6, applying a concrete plug (17) at the downstream outlet of the concrete culvert (2), and repeating step S2; S7, sensor embedding: during the filling process of the dam (1), sensors (15) are respectively embedded at different horizontal planes; S8. After the dam (1) model is built, water is stored upstream so that the interior of the concrete culvert (2) is filled with water to simulate the gravity of water; S9, adjusting different water injection pressures to conduct a pressure pipe culvert leakage scouring test on the dam (1); S10, real-time monitoring of data changes of the flow acquisition module (6) and the flow velocity acquisition module (5) of the sensor (15) inside the dam (1), and when damage occurs inside the dam (1), starting the grouting equipment (12) to perform a grouting repair test on the dam (1); S11. Based on the test data obtained, the development of scour damage to the dam (1) and the effect of grouting repair are studied and analyzed.

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