Testing device for simulating hidden defects of reservoir causeway

Abstract

The utility model relates to the technical field of hydraulic engineering, in particular to a testing device for simulating hidden defects of a reservoir causeway, which comprises an overflow type water supply tank and is characterized in that the front end of the overflow type water supply tank is connected with a water storage tank, and a submersible pump is arranged in the water storage tank; the right end of the overflow type water supply tank is connected with a water stabilizing tank, a pore plate used for dividing the tank body space into a water stabilizing tank and a sand tank is arranged in the water stabilizing tank, and the water stabilizing tank and the sand tank are located on the left side and the right side of the pore plate respectively. A cover plate is arranged at the top of the water stabilizing tank, a pressure measuring pipe communicated with the interior of the water stabilizing tank and a connector are arranged on the cover plate, an additional part is installed at the connector, and a flow guide groove is formed in the surface of the cover plate and located on the peripheral side of the additional part; a sand filtering disc is arranged at the upper part of the water measuring barrel, and an electronic scale is arranged at the lower part of the water measuring barrel. The device has the advantages of being reasonable in design, economical, effective, simple in structure and low in cost, and has large practical value for researching the problems existing in the hidden defects of the reservoir causeway.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy engineering technical field especially, relate to a kind of test device of simulation reservoir embankment hidden defect. BACKGROUND

[0002] Reservoir embankment plays a vital role in water conservancy engineering, it bears water storage, flood control, irrigation and other important functions, and its safety is directly related to the safety of life and property of surrounding areas and the stability of ecological environment. However, in the long-term operation process of reservoir embankment, due to the influence of various complex factors, such as geological condition change, water scouring, material aging, etc., various hidden defects will inevitably occur. These hidden defects are difficult to accurately find and evaluate through conventional appearance inspection or simple detection means. For example, internal soil cavity, piping channel, void between embankment body and foundation and local damage of impervious body, etc. Hidden defects often hide in the internal structure of the embankment, and are not easy to detect. But they may gradually develop under certain hydraulic conditions or external load, eventually leading to leakage, landslide and even dam failure of the embankment, causing huge losses to the society.

[0003] At present, in the field of reservoir embankment detection and research, although there are some devices and technologies for detecting embankment physical parameters or local surface conditions, such as geological radar, ultrasonic detector, etc., most of these technologies can only detect the surface or shallow part of the embankment, and there are still great limitations in the research of deep hidden defects. And the existing detection means often cannot accurately simulate the evolution process of hidden defects of reservoir embankment under complex working conditions in laboratory environment, and cannot deeply explore the defect formation mechanism and the influence law on the overall stability of the embankment.

[0004] Therefore, there is an urgent need for a test device specially used for simulating reservoir embankment hidden defects, so as to deeply study the characteristics, development process and interaction between different types of hidden defects and embankment structure under controllable experimental conditions, so as to provide more scientific and accurate basis for safety evaluation, disease prevention and engineering design of reservoir embankment. The test device designed in the utility model patent is to fill this technical gap and meet the actual needs of reservoir embankment hidden defect research. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a kind of test device of simulation reservoir embankment hidden defect, to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the utility model adopts the technical scheme, which is a test device for simulating hidden defects of reservoir embankment, comprising an overflow type water supply tank, characterized in that: the front end of the overflow type water supply tank is connected with a water storage tank, and a submersible pump is arranged in the water storage tank; the right end of the overflow type water supply tank is connected with a water stabilizing tank, and a perforated plate for separating the tank space into a water stabilizing groove and a sand groove is arranged in the water stabilizing tank; the water stabilizing groove and the sand groove are respectively located on the left side and the right side of the perforated plate; a cover plate is arranged on the top of the water stabilizing tank, and a pressure measuring pipe and a connecting port which are in communication with the water stabilizing tank are respectively arranged on the cover plate; an additional part is arranged at the connecting port; a flow guide groove is arranged on the surface of the cover plate and located on the outer circumferential side of the additional part; a water measuring bucket is arranged at the bottom of the outlet of the rightmost end of the flow guide groove; a sand filtering disc is arranged on the upper part of the water measuring bucket; and an electronic scale is arranged on the lower part of the water measuring bucket.

[0007] Preferably, a plurality of reserved holes are arranged on the surface of the cover plate above the sand groove in a transverse arrangement, and the pressure measuring pipe is arranged in the reserved hole.

[0008] Preferably, the water stabilizing tank and the cover plate are made of transparent material, so that the specific conditions in the water stabilizing tank can be observed.

[0009] Preferably, the water stabilizing tank and the overflow type water supply tank are connected through a water conveying pipe.

[0010] Preferably, the water conveying pipe is a rubber pipe, and a special grade rubber pipe is used to ensure the wear resistance and pressure resistance of the water conveying pipe.

[0011] Preferably, two connecting ports are arranged on the cover plate, and an additional part is detachably arranged on each connecting port, so that the state of different reservoir embankment defects can be simulated.

[0012] Preferably, a piping hole is arranged in the additional part, and the piping holes in each additional part can be different or the same.

[0013] Preferably, a sound emission probe is arranged at the tail end of the flow guide groove and located at the right end of the additional part.

[0014] Preferably, the additional part, the flow guide groove and the cover plate are connected through bolts.

[0015] The utility model has the advantages that:

[0016] 1. The experimental device for simulating hidden defects in reservoir embankments of this utility model can simulate the water level in the reservoir, the still water in the reservoir, and the contact between the still water in the reservoir and the reservoir embankment through an overflow water supply tank and a water stabilizing tank. The changes in still water pressure can be easily monitored through multiple pressure measuring tubes inserted on the cover plate. The water stabilizing tank and cover plate, made of transparent material, can directly show whether there are cracks or holes in the reservoir embankment and seepage during the simulation experiment. It can be seen that the embankment defects that were originally hidden are exposed under specific hydraulic conditions, and the defect signs are presented intuitively.

[0017] 2. The water conveying pipe in this utility model is made of high-quality fabric-reinforced rubber pipe, which has a long service life and can continuously simulate the changes in water level in the reservoir and the contact between still water and the embankment for a long time. The development process of hidden defects over time under different hydraulic conditions can be observed through the sand trough in the transparent water stabilization tank. Based on the deformation and displacement of the embankment during the simulation, the influence of hidden defects on the overall stability of the embankment can be analyzed. At the same time, the additional components of the sand trough and cover plate can be disassembled and replaced, realizing the simulation of the state of different reservoir embankment defects.

[0018] 3. The experimental device of this invention can determine the optimal time for defect repair by simulating the behavior of defects under different water levels and still water conditions. Before implementing a repair plan, experiments are conducted using this device to verify the feasibility and effectiveness of the repair materials and technologies, and to test the feasibility of the repair plan. Furthermore, this experimental device is characterized by its reasonable design, economic efficiency, simple structure, and low cost. It can provide substantial assistance in the study of hidden defects in reservoir embankments, including defect discovery and diagnosis, analysis of defect development processes, and simulation of defect repair, and has significant practical value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present utility model.

[0020] Figure 2 This is a front view structural diagram of the water tank of this utility model;

[0021] Figure 3 This is a top view of the water tank structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the additional component in this utility model.

[0023] In the diagram: 1. Overflow water supply tank; 2. Water storage tank; 3. Submersible pump; 4. Stabilizing tank; 41. Stabilizing trough; 42. Sand trough; 5. Orifice plate; 6. Water supply pipe; 7. Cover plate; 8. Pressure measuring pipe; 9. Flow guide trough; 10. Accessories; 11. Acoustic emission probe; 13. Measuring bucket; 14. Filter sand tray; 15. Electronic scale. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0025] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application will be described below according to the overall structure of the present application.

[0026] Referring to Figures 1 to 4 The present application provides a test device for simulating hidden defects of reservoir embankment, which comprises an overflow water supply tank 1 and a water stabilizing tank 4 that are connected to each other, and the water level in the reservoir is simulated by the overflow water supply tank 1, and the still water in the reservoir and the contact between the still water in the reservoir and the reservoir embankment are simulated by the water stabilizing tank 4.

[0027] In some embodiments, referring to Figure 1 The front end of the overflow water supply tank 1 is connected to the water storage tank 2, and a submersible pump 3 is arranged in the water storage tank 2, and the water head in the overflow water supply tank 1 is stabilized by the water storage tank 2 and the submersible pump 3 to simulate the water level in the reservoir.

[0028] In some embodiments, referring to Figure 1The front end of the overflow water supply tank 1 is connected to the water stabilizing tank 4. The water stabilizing tank 4 is provided with an orifice plate 5 for dividing its tank space into a water stabilizing trough 41 and a sand trough 42. The water stabilizing trough 41 and the sand trough 42 are located on the left and right sides of the orifice plate 5, respectively. The sand in the sand trough 42 is filled by layered compaction to simulate the stress state of the embankment. The top of the water stabilizing tank 4 is provided with a cover plate 7.

[0029] In some embodiments, see Figure 1 The water tank 4 and the cover plate 7 are both made of transparent material to ensure the reliability of the model and ease of observation.

[0030] In some embodiments, see Figure 1 The water stabilization tank 4 and the overflow water supply tank 1 are connected by a water supply pipe 6. In this way, the water in the overflow water supply tank 1 is transported to the water stabilization tank 41 in the water stabilization tank 4 through the water supply pipe 6 to carry out the water stabilization process, so as to simulate the still water in the reservoir. After the input water enters the water stabilization tank 41, it passes through the orifice plate 5 and contacts the sand trough 42 to simulate the contact between the still water in the reservoir and the reservoir embankment.

[0031] In some embodiments, see Figure 1 Water pipe 6 is a rubber pipe. Specifically, water pipe 6 uses a high-quality fabric-reinforced rubber pipe to ensure the wear resistance and pressure resistance of water pipe 6 during water transportation.

[0032] In some embodiments, a valve is provided on the water supply pipe 6 to control the delivery of water to the water stabilization tank 4.

[0033] In some embodiments, see Figure 1 The upper surface of the cover plate 7 is provided with a pressure measuring pipe 8 and a connection port that are connected to the water stabilizing tank 4 above the sand trough 42. The pressure measuring pipe 8 accurately measures the water pressure in the water stabilizing tank 4. An accessory 10 is installed at the connection port. A pipe bursting port is opened in the accessory 10. A guide groove 9 is provided on the outer periphery of the accessory 10 on the surface of the cover plate 7.

[0034] In some embodiments, see Figure 1 The surface of the cover plate 7 is horizontally arranged above the sand trough 42 with multiple reserved holes. The pressure measuring tubes 8 are inserted into the reserved holes. Specifically, there are 7 pressure measuring tubes 8. The water pressure in the water tank 4 can be accurately measured through the pressure measuring tubes 8.

[0035] In some embodiments, see Figure 1 The cover plate 7 has two connection ports, and each connection port can be detachably installed with an attachment 10. The attachment 10 has a piping port. The piping ports in each attachment 10 can be different or the same, so as to realize the state simulation of different reservoir embankment defects.

[0036] In some embodiments, see Figure 1The attachment 10 is connected to the guide channel 9 and the cover plate 7 by bolts, which facilitates disassembly and installation during the experiment.

[0037] In some embodiments, see Figure 1 A measuring tank 13 is located at the bottom of the outlet at the far right end of the diversion channel 9. A sand filter is located on the upper part of the measuring tank 13, and an electronic scale 15 is located at the lower part of the measuring tank 13. The sand filter filters and collects solid particles in the test tailwater, and the measuring tank 13 and the electronic scale 15 are used to calculate the seepage flow rate.

[0038] In some embodiments, see Figure 1 An acoustic emission probe 11 is provided at the right end of the auxiliary component 10 at the tail end of the flow channel 9 to record the time of each seepage development node, and to monitor acoustic emission simultaneously during the test.

[0039] Working principle: Sand is filled into sand trough 42 using a layered, compacted method. After filling, the sample surface is leveled, and then the valve on the water supply pipe 6 is opened to make the water level equal to the top of the sand sample, thereby expelling air from the sand sample. The sample is left to stand for at least 24 hours to allow it to fully saturate. The cover plate 7 on top of the water stabilization tank 4 is placed and secured with bolts. Vaseline is applied to the contact areas between the cover plate 7 and the water stabilization tank 4 to prevent leakage during the test. During the test, the overflow height is changed to gradually increase the water head in the overflow water supply tank 1, thereby altering the water pressure in the water stabilization tank 4 to achieve loading. When the water level in the pressure measuring pipe 8 and the outlet flow rate are stable, and the water flow at the piping outlet is clear with no sand particles carried out of the soil (i.e., stable seepage), the water level in the water supply tank is increased to advance the test. Each water level is maintained for at least 10 minutes until the erosion channel penetrates the sand body (the destructive phenomenon to the sand body during the experiment). The time of each seepage development node was recorded, and the height of the piezometer 8 and the seepage flow rate were read approximately every 10 minutes. Acoustic emission monitoring was also conducted simultaneously during the experiment. After the erosion channel penetrated the sand body, the valve at the water supply pipe 6 was closed, the water level in the overflow water supply tank 1 was lowered, and the top cover plate 7 of the water stabilization tank 4 was opened. A laser rangefinder was used with a fixed frame to sample the surface of the sand trough 42 to obtain the real data of the piping channel. This experiment can use different attachments 10, in conjunction with the two connection ports of the cover plate 7, to conduct combined experiments. Different attachments 10 can be installed to conduct comparative experiments on the erosion behavior under different sizes of piping openings, circular outlets and trough-shaped outlets, and different seepage diameter lengths. Through comparative experiments, the flow rate and other data of water gushing out of the piping opening under different conditions can be analyzed to evaluate the response differences of different hidden defects in the reservoir embankment.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A test device for simulating hidden defects in reservoir embankments, comprising an overflow water supply tank, characterized in that: The overflow water supply tank is connected to a storage tank at its front end, and a submersible pump is installed inside the storage tank. The right end of the overflow water supply tank is connected to a water stabilization tank, which has an orifice plate that divides its space into a water stabilization trough and a sand trough. The water stabilization trough and the sand trough are located on the left and right sides of the orifice plate, respectively. The top of the water stabilization tank is equipped with a cover plate, which has a pressure measuring pipe and a connection port that communicate with the inside of the water stabilization tank. An accessory is installed at the connection port, and a guide groove is provided on the outer periphery of the cover plate on the accessory. A measuring bucket is provided at the bottom of the outlet at the far right end of the guide groove. A sand filter is provided on the upper part of the measuring bucket, and an electronic scale is provided at the lower part of the measuring bucket.

2. The experimental device for simulating hidden defects in reservoir embankments according to claim 1, characterized in that, The cover plate has multiple pre-drilled holes arranged horizontally above the sand trough, and the pressure measuring tube is inserted into the pre-drilled holes.

3. The experimental device for simulating hidden defects in reservoir embankments according to claim 2, characterized in that, Both the water tank and the cover plate are made of transparent material.

4. The experimental device for simulating hidden defects in reservoir embankments according to claim 3, characterized in that, The water stabilizing tank and the overflow water supply tank are connected by a water pipe.

5. The test device for simulating hidden defects in reservoir embankments according to claim 4, characterized in that, The water supply pipe is made of rubber to ensure its wear resistance and pressure resistance.

6. The test apparatus for simulating hidden defects in reservoir embankments according to claim 5, characterized in that, The cover plate has two connection ports, and each connection port can be detachably installed with an attachment to simulate the state of different reservoir embankment defects.

7. The test apparatus for simulating hidden defects in reservoir embankments according to claim 6, characterized in that, The attachment has a piping port, and the piping ports in each attachment may be different or the same.

8. The test apparatus for simulating hidden defects in reservoir embankments according to claim 7, characterized in that, An acoustic emission probe is provided at the tail end of the guide channel, located at the right end of the attachment.

9. The test apparatus for simulating hidden defects in reservoir embankments according to claim 8, characterized in that, The attachment is connected to the guide channel and the cover plate by bolts.

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