Reservoir bank slope centrifugal vibration table test device and test method

Abstract

The embodiment of the invention provides a reservoir bank slope centrifugal vibration table test device and method, and the device comprises a test box which is disposed on a vibration mechanism and comprises a top plate, a first side plate and a second side plate, the first side plate and the second side plate are oppositely disposed, the top plate is provided with a rainfall simulation mechanism, and the first side plate is provided with a slope model in an attached manner; the position, corresponding to the slope model, of the second side plate is provided with a telescopic partition plate mechanism, the telescopic partition plate mechanism comprises a partition plate which is vertically arranged, a preset amount of water is injected between the partition plate and the slope model, and the water level is adjusted by adjusting the front-back position of the partition plate relative to the first side plate. Through structural improvement, the device is suitable for a supergravity test environment, the reliability of the test device is improved, the device can simulate single test conditions such as rainfall, earthquakes and water level changes or multi-factor coupling test conditions, and the accuracy, effectiveness and integrity of test results are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of geotechnical engineering technology, and in particular to a centrifugal vibration table test device and test method for a reservoir bank slope. Background Art

[0002] The bank slopes of the reservoir are immersed in water for a long time and experience frequent water level changes, which leads to the gradual deterioration of the slope material properties and reduced stability. When encountering earthquakes or extreme rainfall events, the frequency of reservoir bank landslide disasters is aggravated.

[0003] Centrifuge model test technology is widely used in the study of reservoir bank landslide mechanism, which can simulate the influence of rainfall infiltration and water level fluctuation separately. However, it cannot fully simulate the frequent water level change process, nor can it accurately simulate the coupling effect between rainfall, water level change and earthquake. The accuracy and effectiveness of the test model are limited. Summary of the invention

[0004] In view of this, the purpose of the embodiments of the present application is to propose a centrifugal vibration table test device and test method for a reservoir bank slope to solve the problem of model limitations.

[0005] Based on the above purpose, the embodiment of the present application provides a reservoir bank slope centrifugal vibration table test device, including:

[0006] The test box is arranged on the vibration mechanism, and the test box includes a top plate, a first side plate and a second side plate arranged opposite to each other, the top plate is provided with a simulated rainfall mechanism, the first side plate is provided with a slope model in close contact, and the second side plate is provided with a telescopic partition mechanism at a position corresponding to the slope model, the telescopic partition mechanism includes a vertically arranged partition, a predetermined amount of water is injected between the partition and the slope model, and the water level is adjusted by adjusting the front and rear position of the partition relative to the first side plate.

[0007] Optionally, the telescopic partition mechanism includes a telescopic rod, a fixed end of the telescopic rod is fixedly connected to the second side panel, a movable end of the telescopic rod is connected to the partition, the bottom of the partition is connected to the bottom of the test box via a slide rail, and the telescopic direction of the telescopic rod is perpendicular to the direction of supergravity.

[0008] Optionally, the simulated rainfall mechanism includes a water supply pipe, a rainmaker and an atomizer, one end of the water supply pipe is connected to the water supply port of the centrifuge water supply system, the other end of the water supply pipe is connected to the atomizer through the rainmaker, and the rainmaker is arranged horizontally.

[0009] Optionally, a plurality of third pressure sensors for monitoring the pore water pressure of the slope model and a fourth pressure sensor for monitoring the soil pressure of the slope model are arranged at the bottom of the test box, and a pair of third pressure sensors and fourth pressure sensors are arranged at the same location.

[0010] Optionally, a fifth pressure sensor for monitoring water pressure is provided at a position of the bottom of the test box corresponding to the water injection position;

[0011] The device also includes a main control unit, which is used to receive a fifth pressure signal collected by the fifth pressure sensor, determine a water pressure value according to the fifth pressure signal, correct the current water level according to the water pressure value to obtain a corrected water level value, and control the telescopic length of the telescopic partition mechanism according to the corrected water level value so that the water level value reaches the target water level.

[0012] Optionally, at least one laser tracker for detecting displacement signals of key position points on the surface of the slope model is provided on the second side plate.

[0013] Optionally, the top plate is provided with an image acquisition unit, and the top plate is connected to a fixing member of the image acquisition unit via a rigid component.

[0014] Optionally, the device further comprises:

[0015] The main control unit is used to receive the model image collected by the image collection unit and the displacement signal of the key position point collected by the laser tracker, and correct the model image according to the displacement signal to obtain a corrected model image.

[0016] Optionally, correcting the model image according to the displacement signal includes:

[0017] estimating three-dimensional displacement vectors of all pixels based on the model image;

[0018] Determine a correction coefficient based on the three-dimensional displacement vector of the key position point collected by the laser tracker and the three-dimensional displacement vector of the key position point corresponding to all pixel points;

[0019] The three-dimensional displacement vectors of all pixel points are corrected according to the correction coefficient.

[0020] Optionally, the correction coefficient is calculated as follows:

[0021] C x =(d x / d i,x ), C y =(d y / d i,y ), C z =(dz / d i,z ) (4)

[0022] Among them, d x is the displacement component of the three-dimensional displacement vector collected by the laser tracker in the x direction, d y is the displacement component of the three-dimensional displacement vector in the y direction, d z is the displacement component of the three-dimensional displacement vector in the z direction; d ix is the displacement component of the three-dimensional displacement vector of the pixel point corresponding to the key position point in the x direction, d i,y is the displacement component of the three-dimensional displacement vector of the pixel in the y direction, d i,z is the displacement component of the three-dimensional displacement vector of the pixel point in the z direction;

[0023] The method for correcting the three-dimensional displacement vector of the pixel point according to the correction coefficient is:

[0024] d i `=(d i,x ·C x , d i,y ·C y , d i,z ·C z ) (5)

[0025] Among them, d i ` is the three-dimensional displacement vector of the corrected pixel point.

[0026] The embodiment of the present application also provides a centrifugal vibration table test method for a reservoir bank slope, and the test is performed based on the centrifugal vibration table test device for a reservoir bank slope as described above.

[0027] From the above, it can be seen that the centrifugal vibration table test device and test method for the bank slope provided in the embodiment of the present application, the test box is set on the vibration mechanism, which can simulate earthquake conditions, and the test box is provided with a simulated rainfall mechanism and a telescopic partition mechanism, which can simulate rainfall conditions and adjust the water level. Through structural improvement, the device is suitable for the hypergravity test environment, and the reliability of the test device is improved. The device can simulate single test conditions such as rainfall, earthquake and water level changes, or test conditions with multiple factors coupled, and improve the accuracy, effectiveness and integrity of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the device structure of an embodiment of the present application;

[0030] Figure 2 It is a top view of the device according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] In the related art, the centrifugal model test device for the bank slope uses a solenoid valve as the switch of the simulated water level lifting mechanism. Due to its complex structure, it is easy to fail in a hypergravity environment, reducing the reliability of the system; the ability to simulate water level lifting is limited by the capacity of the water supply tank and the drainage tank, and it is difficult to accurately simulate the process of frequent water level lifting and lowering; in order to ensure that the rainmaker is parallel to the slope, the simulated rainfall mechanism is generally set to maintain a certain angle with the horizontal plane. Under the action of the huge centrifugal force, a significant water pressure difference will be generated at both ends of the rainmaker; at the same time, the device cannot simulate the coupling effect of multiple factors such as rainfall, water level changes and earthquakes. The above structural design imposes certain limitations on the accuracy, effectiveness and integrity of the test device. In addition, since the image acquisition unit such as the camera is generally arranged outside the test box for observation, the accuracy of the observation data is not high due to the influence of the test box wall, which affects the accuracy of the test results.

[0034] In view of this, an embodiment of the present application provides a centrifugal vibration table test device for a reservoir bank slope, wherein a test box is arranged on a vibration mechanism, and can simulate earthquake conditions; a simulated rainfall mechanism and a telescopic partition mechanism are provided in the test box, and can simulate rainfall conditions and water level rise and fall conditions; through structural improvement, the device is suitable for a hypergravity test environment, and the reliability of the device is improved; the device can simulate single test conditions such as rainfall, earthquakes, and water level changes, or test conditions of multiple factors coupled, and improve the accuracy, validity, and completeness of the test results.

[0035] The technical solution of the present application is further described in detail below through specific embodiments.

[0036] like Figure 1 , 2 As shown, the reservoir bank slope centrifugal vibration table test device provided in the embodiment of the present application includes:

[0037] The test box is arranged as a whole on the vibration mechanism, and includes a top plate 21, a first side plate 22 and a second side plate 23 which are arranged opposite to each other. The top plate 21 is provided with a simulated rainfall mechanism, the first side plate 22 is provided with a slope model 6 in close contact, and a telescopic partition mechanism is provided at a position of the second side plate 23 corresponding to the slope model 6. The telescopic partition mechanism includes a vertically arranged partition 9, and a predetermined amount of water 8 is injected between the partition 9 and the slope model 6. The water level is adjusted by adjusting the front and rear position of the partition 9 relative to the first side plate 22.

[0038] In this embodiment, the test device includes a test box arranged on a vibration mechanism, and the earthquake environment of the test device can be simulated by the up and down regular vibration of the vibration mechanism; a simulated rainfall mechanism is arranged on the top plate 21 of the test box to simulate the rainfall conditions of the test device; a slope model composed of slope materials is stacked on the first side plate 22 of the test box, and the slope foot of the slope model is located on the side away from the first side plate 22, and the second side plate 23 is provided with a telescopic partition mechanism, and the telescopic partition mechanism includes a telescopic rod 10, the fixed end of the telescopic rod 10 is fixedly connected to the second side plate 23, the movable end of the telescopic rod 10 is connected to the partition 9, and the bottom of the partition 9 is connected to the bottom of the test box through a slide rail 11, the telescopic rod 10 is telescopic in a front-to-back direction perpendicular to the direction of supergravity, and drives the partition 9 to move in the front-to-back direction, that is, drives the partition 9 to move in a direction away from or close to the first side plate 22, and because the telescopic direction is perpendicular to the direction of supergravity, the telescopic rod 10 is not affected by the supergravity, so that the reliability of the device can be ensured. A certain amount of water 8 is injected between the partition 9 and the slope model 6. The injected water is liquid simulating the river and the sea. The distance of the partition 9 relative to the slope model 6 is changed by the extension and retraction of the telescopic rod 10, and the water level between the partition 9 and the slope model 6 is changed. Then, the water level height can be controlled by adjusting the telescopic length of the telescopic rod 10 to accurately simulate the water level change condition. The structure of the telescopic partition mechanism is simple and reliable, suitable for the supergravity test environment, not affected by the capacity of the water supply tank and the drainage tank, and can simulate the reservoir water level rise and fall test conditions repeatedly, quickly and accurately.

[0039] In some embodiments, to avoid deformation under the action of excessive gravity, the telescopic rod 10 has a predetermined strength and rigidity. The bottom of the partition 9 and the bottom of the slide rail 11 and the test box are waterproofed, and the partition, the slide rail and the test box are sealed.

[0040] In some embodiments, the simulated rainfall mechanism includes a water supply pipe 1, a rainmaker 2 and an atomizer 3. One end of the water supply pipe 1 is connected to the water supply port of the centrifuge water supply system, and the other end of the water supply pipe 1 is connected to the atomizer 3 through the rainmaker 2. The rainfall intensity of the simulated rainfall mechanism can be controlled by controlling the water pressure and water volume of the centrifuge water supply system, and the uniformity of rainfall can be controlled by controlling the position and atomization intensity of the atomizer 3. The rainmaker 2 is arranged horizontally, and when the centrifuge rotates at high speed, it can ensure that there is basically no water pressure difference in the rainmaker 2, thereby ensuring the accuracy of the test.

[0041] In some embodiments, at least one laser tracker 7 is provided on the second side plate 23 for monitoring the displacement of key positions on the surface of the slope model 6. The top plate 21 is connected to the image acquisition unit 4 through the rigid component 5 and the fixed connector 12, and is used to acquire the model image of the slope model 6. The test device also includes a main control unit, and the displacement signal of the key position point acquired by the laser tracker 7 is transmitted to the main control unit, which processes the displacement signal to determine the displacement of the key position point under specific test conditions; the model image acquired by the image acquisition unit 4 is transmitted to the main control unit, which processes the model image to determine the overall change of the slope model 6 under specific test conditions.

[0042] Optionally, to improve the reliability of the device and the accuracy of image acquisition, the rigid component 5, the top plate 21 and the fixing member of the image acquisition unit 4 are integrally formed to prevent the image acquisition unit from changing position or even falling off under different test conditions. The image acquisition unit 4 can be a CCD camera device.

[0043] The slope model 6 is internally provided with a first pressure sensor for detecting soil pressure, a second pressure sensor for detecting pore water pressure, and an acceleration sensor. The first pressure signal, the second pressure signal, and the acceleration signal respectively collected by the first pressure sensor, the second pressure sensor, and the acceleration sensor are transmitted to the main control unit, and the main control unit processes the first pressure signal, the second pressure signal, and the acceleration signal to determine the dynamic response law of the slope model 6 under specific test conditions.

[0044] A plurality of third pressure sensors and a fourth pressure sensor are arranged at the bottom of the test box, and a pair of the third pressure sensor and the fourth pressure sensor are arranged at the same location 13, for respectively monitoring the pore water pressure and the soil pressure at a specific location at the bottom of the slope model. The third pressure signal and the fourth pressure signal respectively collected by the third pressure sensor and the fourth pressure sensor at each location are transmitted to the main control unit, which processes the third pressure signal and the fourth pressure signal to obtain the pore water pressure and the soil pressure corresponding to different locations.

[0045] The test device of the present application is provided with a simulated rainfall unit, a vibration mechanism and a telescopic partition mechanism, and the simulated rainfall unit, the vibration mechanism and the telescopic partition mechanism can work independently to provide a single test condition, which is convenient for studying the stability of the slope under a single test condition. It can also work simultaneously to provide multiple test conditions, simulate the coupling effects of multiple factors such as rainfall infiltration, earthquake dynamics, and water level rise and fall, and study the influence of the coupling effects of multiple factors on the slope, which is conducive to studying the primary and secondary relationships of the three factors in the instability process of various slopes.

[0046] In some embodiments, in the study of reservoir bank landslides, rainfall, earthquakes and reservoir water level fluctuations are three key disaster-causing factors. Among them, rainfall has a small impact on landslides and is usually a relatively minor factor. Reservoir water level fluctuations are the most common disaster-causing factor due to their high frequency of occurrence. Earthquakes are the strongest disaster-causing factor because they can easily induce slope instability due to strong vibrations. Based on the above test ideas, the steps of conducting the test using the test device of the present application can be designed as follows:

[0047] Collect undisturbed soil and rocks from the study area and pile them into a slope model in a test box according to similar proportions; adjust the telescopic length of the telescopic rod to a predetermined position, and inject an appropriate amount of water between the partition and the slope model to the low water level line;

[0048] Place the test box on the vibration mechanism, start the main control unit, image acquisition unit and sensors, and set the centrifugal acceleration of the centrifuge;

[0049] Under rainfall conditions, after the slope model is stable, the rainfall amount and rainfall intensity of the simulated rainfall mechanism are controlled to simulate the rainstorm conditions. After reaching the preset target duration, a short-term stable operation is performed. If the slope model remains stable, the heavy rainstorm conditions are simulated. After reaching the target duration, a short-term stable operation is performed. If the slope model remains stable, the extremely heavy rainstorm conditions are simulated. After reaching the target duration, a short-term stable operation is performed. If the slope model remains stable throughout the entire rainfall condition, the reservoir water level rise and fall condition is entered. At this time, the surface of the slope model has been fully soaked, and the effect of reducing the slope safety caused by rainfall has been achieved.

[0050] In the reservoir water level rise and fall condition, the water level rise and fall is adjusted by adjusting the telescopic length of the telescopic rod. After reaching the preset target water level, the changes in the slope model are observed. If the slope model remains stable, the telescopic length of the telescopic rod is reduced, the water level is lowered, and the changes in the slope model are observed. Repeat the reservoir water level rise and fall process three times, and finally return to the low water level line. If the slope model remains stable, the earthquake condition is entered. At this time, the seepage balance has been achieved inside the slope model, and the effective stress of the slope model has been greatly reduced. The effect of reducing the slope safety caused by the rise and fall of the reservoir water level has been achieved. The conditions for achieving seepage balance inside the slope are closer to the actual situation of reservoir bank landslides, and the test results are more authentic and have reference value.

[0051] Under earthquake conditions, start the vibration mechanism and set the target vibration peak value (for example, set the earthquake peak acceleration to 0.1g). After the vibration mechanism runs for the target time, if the slope model remains stable, reset the target vibration peak value (for example, adjust the earthquake peak acceleration to 0.2g) and continue to vibrate for a certain period of time. If the slope model remains stable, gradually increase the target vibration peak value until the slope model becomes unstable.

[0052] By using the test device of the present application to conduct simulation tests and comprehensively consider a number of major disaster-causing factors, it is possible to systematically evaluate the stability and failure mechanism of the slope under different working conditions and provide more comprehensive research results. During the test, by increasing the rainfall intensity in stages, repeatedly raising and lowering the reservoir water level, and gradually increasing the earthquake peak acceleration to verify the failure mechanism, the response of the slope at each stage can be accurately observed, which helps to more accurately analyze the independent and joint effects of various factors on the stability of the slope. The test conditions under each working condition (rainfall intensity, water level, earthquake acceleration, etc.) can be repeatedly set to be the same or different, and the test results are highly comparable, which is conducive to summarizing the laws of the influence of various factors on the stability of the slope. By observing the performance of the slope model under different working conditions, the possibility and degree of damage of reservoir bank landslides under similar geological conditions can be estimated, providing a scientific basis for landslide prevention and control in actual engineering.

[0053] It should be noted that the above only provides one possible test procedure. In actual applications, the test device can be used to simulate a variety of different test conditions or multiple test conditions to further study the slope stability under different test conditions.

[0054] In some embodiments, a fifth pressure sensor 14 for monitoring water pressure is provided at a position at the bottom of the test box corresponding to the water injection position. The fifth pressure signal collected by the fifth pressure sensor 14 is transmitted to the main control unit, and the main control unit processes the fifth pressure signal to obtain a water pressure value, corrects the current water level according to the water pressure value to obtain a corrected water level value, and controls the telescopic length of the telescopic rod according to the corrected water level value so that the water level value reaches the target water level.

[0055] In some embodiments, the method for correcting the current water level according to the water pressure value is:

[0056]

[0057] Among them, h is the modified water level value, a is the centrifugal acceleration, ρ is the density of the injected liquid, and p is the water pressure value.

[0058] If multiple fifth pressure sensors are arranged at different locations on the bottom of the test box corresponding to the water injection position, the main control unit receives the fifth pressure signal of each fifth pressure sensor, processes it to obtain the water pressure value of each location, calculates the average value of the water pressure value of each location, and calculates the corrected water level based on the average value of the water pressure value. That is, if multiple fifth pressure sensors are set, p in formula (1) is the average value of the water pressure value.

[0059] The control end of the main control unit is connected to the control end of the telescopic rod. After the corrected water level value is calculated, the water level is adjusted to the target water level by controlling the telescopic length of the telescopic rod, thereby achieving the purpose of accurately adjusting the water level and improving the accuracy of the test results.

[0060] In some embodiments, since the centrifugal model test is a scaled test, the actual rainfall intensity needs to be scaled down to the test scale. In order to determine the rainfall intensity at the test scale, a water volume monitor is provided on the water supply pipe 1 to detect the total mass of rainfall. The total mass of rainfall detected by the water volume monitor is transmitted to the main control unit. The main control unit calculates the rainfall intensity according to the total mass of rainfall and the rainfall time of the simulated rainfall mechanism. The calculation method is:

[0061]

[0062] Among them, M is the total rainfall mass, A is the preset experimental rainfall area, t is the rainfall time, and N is the preset model scale.

[0063] In some methods, the test device can be set to three levels of rainfall intensity. The actual three levels of rainfall intensity are: heavy rain (50 mm / d), heavy rain (100 mm / d), and extremely heavy rain (250 mm / d). The three levels of rainfall intensity corresponding to the model test under 100g centrifugal acceleration are: heavy rain (3.47L / m 2 ·min), heavy rain (6.94L / m 2 ·min), heavy rain (17.35L / m 2 ·min).

[0064] In some embodiments, during the test, the image acquisition unit acquires the model image of the slope model and transmits it to the main control unit, which estimates the motion vector of the pixel points in the image through image processing and analysis to obtain a displacement vector cloud map. Considering that the accuracy of the acquired model image will be reduced due to the influence of the test conditions, while the displacement detected by the laser tracker is accurate, in this embodiment, the main control unit corrects the model image according to the displacement signal of the key position point on the surface of the slope model detected by the laser tracker, obtains the corrected model image, improves the accuracy of displacement estimation, and improves the accuracy and reliability of the cloud map.

[0065] Among them, the model image is corrected according to the displacement signals of the key position points on the surface of the slope model, including:

[0066] Estimate the three-dimensional displacement vectors of all pixels based on the model image;

[0067] Determine a correction coefficient based on the three-dimensional displacement vector of the key position point collected by the laser tracker and the three-dimensional displacement vector of the key position point corresponding to all pixel points;

[0068] The three-dimensional displacement vectors of all pixels are corrected according to the correction coefficient.

[0069] In this embodiment, a laser tracker is used to monitor key position points on the surface of the slope model, and an image acquisition unit is used to acquire a model image of the slope model. By processing the model image, the pixel points corresponding to the key position points among all the pixel points of the model image are determined, and the model image is processed according to a preset estimation method to obtain a three-dimensional displacement vector of each pixel point in the image. According to the three-dimensional displacement vector of the key position point acquired by the laser tracker and the three-dimensional displacement vector of the pixel points corresponding to the key position point among all the pixel points, correction coefficients in three directions are calculated, and according to the correction coefficients in three directions, the three-dimensional displacement vector of each pixel point in the model image is corrected to obtain a corrected model image.

[0070] Specifically, let d i (x, y, z) is the three-dimensional displacement vector of the key position point estimated based on the model image collected by image acquisition unit i, d j (d x ,d y ,d z ) is the three-dimensional displacement vector of the key position point detected by the laser tracker j. The model image is corrected according to the three-dimensional displacement vector detected by the laser tracker to obtain the corrected three-dimensional displacement vector d of the key position point i `It is expressed as:

[0071] d i `=(d i,x ·C x , d i,y ·C y , d i,z ·C z ) (3)

[0072] Among them, d i,x is the three-dimensional displacement vector d i (x,y,z) is the displacement component in the x direction, d i,y is the three-dimensional displacement vector d i The displacement component of (x,y,z) in the y direction, d i,z is the three-dimensional displacement vector d i The displacement component of (x,y,z) in the z direction. · represents vector multiplication.

[0073] C x ,C y ,C z They are the correction coefficients in the x, y, and z directions respectively, and the calculation method is:

[0074] C x =(d x / d i,x ), C y =(d y / d i,y ), C z =(d z / d i,z ) (4)

[0075] Among them, d x is the three-dimensional displacement vector d j (d x ,d y ,d z ) is the displacement component in the x direction, d y is the three-dimensional displacement vector d j (d x ,d y ,d z ) is the displacement component in the y direction, d z is the three-dimensional displacement vector d j (d x ,d y ,d z ) is the displacement component in the z direction.

[0076] For other pixel points in the model image except the key position points, correction is performed according to the correction coefficient in formula (4) and the three-dimensional displacement vector of each pixel point according to the correction method shown in formula (3), thereby obtaining the three-dimensional displacement vectors of all corrected pixel points in the model image. Afterwards, the first-order derivative and second-order derivative operations are performed based on the three-dimensional displacement vectors of the corrected pixel points to obtain the three-dimensional velocity vector and the three-dimensional acceleration vector, and then the slope dynamic cloud map is drawn based on the three-dimensional displacement vector, the three-dimensional velocity vector and the three-dimensional acceleration vector, which can improve the accuracy of the cloud map.

[0077] In some methods, let v(x, y, z) be a three-dimensional velocity vector. At time t, the three-dimensional velocity vector of the key position point can be expressed as:

[0078] v i t (x, y, z)=(d i (t+1) (x, y, z)-d i t (x, y, z))f (5)

[0079] Where, f represents the frame rate, d i t (x, y, z) is the three-dimensional displacement vector of the key position point at time t, d i (t+1)(x, y, z) is the three-dimensional displacement vector of the key position point at time t+1. The time interval between time t+1 and time t is the average time required for the image acquisition unit to collect one frame. For example, if the CCD camera has 50 frames per second, the average time required to collect one frame is 0.02 seconds.

[0080] Let a(x,y,z) be the three-dimensional acceleration vector. The three-dimensional acceleration vector of the key position point at time t can be expressed as:

[0081] a i t (x, y, z)=(v i (t+1) (x, y, z)-v i t (x, y, z))f (6)

[0082] Among them, v i (t+1) (x, y, z) is the three-dimensional velocity vector of the key position point at time t+1. Based on the three-dimensional displacement vectors of all corrected pixel points in the model image, the three-dimensional velocity vectors corresponding to all corrected pixel points are calculated according to formula (5), and the three-dimensional acceleration vectors corresponding to all corrected pixel points are calculated according to formula (6), so as to draw the dynamic cloud map of the slope based on the three-dimensional displacement vector, three-dimensional velocity vector and three-dimensional acceleration vector.

[0083] In some embodiments, in order to further improve the accuracy of correction, multiple laser trackers may be provided, and the model image may be corrected based on displacement signals collected by the multiple laser trackers.

[0084] Specifically, let d i k (x k ,y k ,z k ) is the three-dimensional displacement vector of the kth key position point estimated based on the model image acquired by the image acquisition unit i, d j k (d x k ,d y k ,d z k ) is the three-dimensional displacement vector of the kth key position point detected by the laser tracker j. The correction coefficient C for the x, y, and z directions is x ,C y ,C z , the best correction coefficient can be obtained by taking the derivative of the error function and setting the derivative to 0. The calculation method is:

[0085]

[0086] Where N is the number of laser trackers. If one laser tracker detects one key position point, N is also the number of key position points detected by the laser tracker. k is the three-dimensional displacement vector d i k (x k ,y k ,z k ) is the displacement component in the x direction, y k is the three-dimensional displacement vector d i k (x k ,y k ,z k ) is the displacement component in the y direction, z k is the three-dimensional displacement vector d i k (x k ,y k ,z k ) is the displacement component in the z direction; is the three-dimensional displacement vector d j k (d x k ,d y k ,d z k ) is the displacement component in the x direction, d y k is the three-dimensional displacement vector d j k (d x k ,d y k ,d z k ) is the displacement component in the y direction, d z k is the three-dimensional displacement vector d j k (d x k ,d y k ,d z k ) is the displacement component in the z direction.

[0087] E x 、E y 、E z The sum of the squares of the differences between the displacement vectors estimated in the x, y, and z directions and the displacement vectors detected by the laser tracker, respectively, is expressed as:

[0088]

[0089] The centrifugal vibration table test device for the reservoir bank slope provided in the embodiment of the present application has a test box arranged on a vibration mechanism, which can simulate earthquake conditions of different intensities; a simulated rainfall mechanism is arranged on the top of the test box, and the rainmaker is arranged horizontally, which basically does not produce water pressure difference, thereby ensuring the accuracy of the test; a telescopic partition mechanism is arranged in the test box, and the telescopic rod drives the partition to move forward and backward to adjust the water level rise and fall, accurately simulating the water level height change conditions, and the telescopic direction of the telescopic rod is perpendicular to the supergravity direction, which is suitable for the supergravity test environment; using the device of the present application, the influence of one test condition among rainfall, earthquake and water level change or the coupling effect of multiple factors under several test conditions on the stability of the slope can be simulated, and by correcting the monitored water level value and performing displacement correction on the collected simulation image, the accuracy and effectiveness of the test results can be improved.

[0090] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the described method.

[0091] It should be noted that the above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0092] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0093] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present disclosure, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0094] Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0095] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present disclosure.

Claims

1. A centrifugal vibration table test device for reservoir bank slope, characterized in that: include: The test box is arranged on the vibration mechanism, and the test box includes a top plate, a first side plate and a second side plate arranged opposite to each other, the top plate is provided with a simulated rainfall mechanism, the first side plate is provided with a slope model in close contact, and the second side plate is provided with a telescopic partition mechanism at a position corresponding to the slope model, the telescopic partition mechanism includes a vertically arranged partition, a predetermined amount of water is injected between the partition and the slope model, and the water level is adjusted by adjusting the front and rear position of the partition relative to the first side plate.

2. The device according to claim 1, characterized in that The telescopic partition mechanism includes a telescopic rod, a fixed end of the telescopic rod is fixedly connected to the second side plate, a movable end of the telescopic rod is connected to the partition, the bottom of the partition is connected to the bottom of the test box through a slide rail, and the telescopic direction of the telescopic rod is perpendicular to the direction of supergravity.

3. The device according to claim 1, characterized in that The simulated rainfall mechanism includes a water supply pipe, a rainmaker and an atomizer. One end of the water supply pipe is connected to the water supply port of the centrifuge water supply system, and the other end of the water supply pipe is connected to the atomizer through the rainmaker. The rainmaker is arranged horizontally.

4. The device according to claim 1, characterized in that A plurality of third pressure sensors for monitoring the pore water pressure of the slope model and a fourth pressure sensor for monitoring the soil pressure of the slope model are arranged at the bottom of the test box, and a pair of the third pressure sensor and the fourth pressure sensor are arranged at the same location.

5. The device according to claim 1, characterized in that A fifth pressure sensor for monitoring water pressure is arranged at a position at the bottom of the test box corresponding to the water injection position; The device also includes a main control unit, which is used to receive a fifth pressure signal collected by the fifth pressure sensor, determine a water pressure value according to the fifth pressure signal, correct the current water level according to the water pressure value to obtain a corrected water level value, and control the telescopic length of the telescopic partition mechanism according to the corrected water level value so that the water level value reaches the target water level.

6. The device according to claim 1, characterized in that The second side plate is provided with at least one laser tracker for detecting displacement signals of key position points on the surface of the slope model; the top plate is provided with an image acquisition unit, and the top plate is connected to a fixing member of the image acquisition unit through a rigid component.

7. The device according to claim 6, characterized in that Also includes: The main control unit is used to receive the model image collected by the image collection unit and the displacement signal of the key position point collected by the laser tracker, and correct the model image according to the displacement signal to obtain a corrected model image.

8. The device according to claim 7, characterized in that Correcting the model image according to the displacement signal includes: estimating three-dimensional displacement vectors of all pixels based on the model image; Determine a correction coefficient based on the three-dimensional displacement vector of the key position point collected by the laser tracker and the three-dimensional displacement vector of the key position point corresponding to all pixel points; The three-dimensional displacement vectors of all pixel points are corrected according to the correction coefficient.

9. The device according to claim 8, characterized in that The calculation method of the correction coefficient is: C x =(d x / d i，x ),C y =(d y / d i，y ),C z =(d z / d i，z ) (4) Among them, d x is the displacement component of the three-dimensional displacement vector collected by the laser tracker in the x direction, d y is the displacement component of the three-dimensional displacement vector in the y direction, d z is the displacement component of the three-dimensional displacement vector in the z direction; d,x is the displacement component of the three-dimensional displacement vector of the pixel point corresponding to the key position point in the x direction, d i , y is the displacement component of the three-dimensional displacement vector of the pixel in the y direction, d i , z is the displacement component of the three-dimensional displacement vector of the pixel point in the z direction; The method for correcting the three-dimensional displacement vector of the pixel point according to the correction coefficient is: d i `=(d i ,x·Cx,d i ,y·Cy,d i ,z·Cz) (5) Among them, d i ` is the three-dimensional displacement vector of the corrected pixel point.

10. A centrifugal vibration table test method for a reservoir bank slope, characterized in that: The test is carried out based on the reservoir bank slope centrifugal vibration table test device as described in any one of claims 1 to 9.

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