Device for testing water stability of revetment base material and evaluation method thereof

Abstract

The invention provides a bank protection base material water stability testing device and an evaluation method thereof. Comprising a sample test assembly which comprises a water containing tank, a sample placing table and a top plate, the top plate is arranged at the top of the water containing tank, and the sample placing table is arranged in the water containing tank through the top plate in a suspension mode; the data acquisition assembly comprises a morphology detection unit and a weight detection unit and is used for acquiring morphology change and weight change of the sample; the test condition simulation assembly comprises a water flow simulation unit, the water flow simulation unit comprises a pump set and a water pipe, and the water flow simulation unit can control the pump set to extract water in the water containing tank through the water pipe and convey the extracted water into the water containing tank again so as to form water flow in the water containing tank; the complex water flow simulation unit comprises a rotatable part, and the rotatable part can rotate to form complex water flow in the water containing tank; and the evaluation module is used for acquiring the morphology change and the weight change acquired by the data acquisition assembly, and evaluating the stability of the sample based on the weight change and the morphology change.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a water stability testing device for a bank protection base material and an evaluation method thereof. Background Art

[0002] Ecological revetment base material refers to a composite material formed by mixing soil, cementing materials, coarse aggregate, organic matter and plant seeds, which has the characteristics of strong durability, stable structure and good permeability. Ecological revetment base material can also provide a suitable environment for plant growth, and the roots of plants can connect the ecological base material and the bank slope into a whole, which has the effect of improving the stability of the bank slope, purifying the water body and improving the ecosystem. Ecological revetment base material is widely used in river banks and is currently a commonly used revetment material.

[0003] The stability of the revetment base material refers to the stability of the revetment base material under the hydrodynamic effects of river water immersion, water flow scouring, wave impact, etc. The stability of the revetment base material can be used to evaluate the protective effect of the revetment base material and the stability of the bank slope. At present, indoor tests are mostly used to study the water stability of soil. For example, patent CN 219302208U proposes an intelligent test device for soil water stability and its use method, which evaluates water stability by the changes in soil sample area and strength under static water immersion conditions, which is simple, fast and effective; patent CN 115754243A invented an improved soil dynamic water stability test device, which can realize the influence of flow rate, temperature and solution. Existing research on the water stability of revetment base materials is mainly based on static immersion, ignoring that the water flow in the river channel is in a flowing state in reality, and the flow speed of river water at different depths is different. The scouring effect caused by the flow of river water and the water flow fluctuations caused by ship driving and wind will also have a non-negligible impact on the water stability of the revetment base material. In addition, due to the influence of factors such as river banks, riverbeds, and flow rates, the river water will also have complex water flow forms such as eddies, turbulence, and whirlpools, which will also increase the probability of bank collapse.

[0004] Therefore, it is urgent to provide a water stability testing device and evaluation method for the bank protection base material to conduct a multi-faceted evaluation of the stability of the bank protection base material under different water flow conditions. Summary of the invention

[0005] The invention provides a water stability testing device for a bank protection base material and an evaluation method thereof, which can comprehensively evaluate the water stability of the base material.

[0006] In one aspect, the present invention provides a device for testing water stability of a bank protection substrate, comprising: The sample test assembly comprises a water tank, a sample placement platform and a top plate, wherein the top plate is arranged on the top of the water tank, and the sample placement platform is suspended inside the water tank through the top plate; The data acquisition component includes a shape detection unit and a weight detection unit, wherein the shape detection unit is used to obtain shape changes of the sample on the sample placement table, and the weight detection unit is used to obtain weight changes of the sample on the sample placement table; Test condition simulation components, including: A water flow simulation unit, comprising a pump group and a water pipe, wherein the water flow simulation unit can control the pump group to extract water from the water tank through the water pipe and transport the extracted water to the water tank again to form a water flow in the water tank; A complex water flow simulation unit, comprising a rotatable component, wherein the rotatable component can be rotated to form a complex water flow in the water tank; An evaluation module is used to obtain the morphological changes and weight changes collected by the data acquisition component, and evaluate the stability of the sample based on the weight changes and the morphological changes.

[0007] Optionally, the sample placement platform includes a filter screen, and the mesh size of the filter screen is 3 to 5 times the limiting particle size in the sample.

[0008] Optionally, the pump set is a pressurized air pump set, and the water pipe includes a plurality of hoses; Movable parts are arranged on both sides of the sample placement table, a part of the multiple hoses is arranged on the movable part on one side of the sample placement table, and a part of the multiple hoses is connected to the water inlet end of the pressurized air pump group; another part of the multiple hoses is arranged on the movable part on the other side of the sample placement table, and another part of the multiple hoses is connected to the water outlet end of the pressurized air pump group; the movable part can adjust the distance between the hoses and the sample placement table by moving.

[0009] Optionally, one end of the hose away from the pressurized air pump group is fixed to the movable member via a fixer, and the fixer can control the one end of the hose away from the pressurized air pump group to rotate.

[0010] Optionally, the rotatable component comprises: A magnetic component and a rotation speed electromagnetic sensor, wherein the rotation speed electromagnetic sensor is connected to the magnetic component and is used to control the rotation speed and direction of the magnetic component.

[0011] On the other hand, a method for evaluating water stability of a bank protection substrate is provided, characterized in that the method is applied to the bank protection substrate water stability testing device as described in any one of the above items, and the method comprises: Simulate target flow conditions for test trials; Testing a plurality of samples under the target water flow conditions; Obtain disintegration times for multiple samples; Determining a normalized value of the sample disintegration time based on the disintegration times of the plurality of samples; Obtain weight and morphological changes of samples; Determining a normalized value of the disintegration rate and a mass loss rate of the sample based on the weight change; determining a morphological change rate of the sample based on the morphological change; The sample is evaluated based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate to determine the stability of the sample under target water flow conditions.

[0012] Optionally, based on the disintegration times of a plurality of samples, determining a normalized value of the disintegration time of the sample comprises: Get the maximum disintegration time of multiple samples and minimum disintegration time ; Get the disintegration time of the current sample ; Normalized value of disintegration time of the current sample for and ratio.

[0013] Optionally, determining a normalized value of the disintegration rate and a mass loss rate of the sample based on the weight change comprises: Based on the formula Determine the disintegration rate of the current sample , is the weight change of the current sample; Get the maximum disintegration rate of multiple samples and minimum disintegration rate ; Based on the formula Determine the normalized value of the disintegration rate of the current sample ; Based on the formula Determine the mass loss rate of the current sample , The mass of the current sample before testing.

[0014] Optionally, determining the morphological change rate of the sample based on the morphological change comprises: Based on the formula Determine the morphological change rate of the current sample , is the projected area of ​​the current sample before testing, is the projected area of ​​the current sample after testing.

[0015] Optionally, the sample is evaluated based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate to determine the stability of the sample under target water flow conditions, including: Determining the disintegration time evaluation score, the disintegration rate evaluation score, the mass loss rate evaluation score, and the morphology change rate evaluation score of the sample based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate; adding weights to the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate, respectively, based on the target water flow condition; Determining the stability evaluation score of the sample based on the disintegration time evaluation score, disintegration rate evaluation score, mass loss rate evaluation score, morphology change rate evaluation score and the weight of the sample; The water stability of the sample is determined based on the water stability evaluation score.

[0016] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects: In an embodiment of the present disclosure, a water stability test device for a bank protection substrate is provided, and the test device includes a sample test component, and the sample test component is used to suspend the sample inside a water tank through a sample placement table to facilitate subsequent testing of the sample. The test condition simulation component can simulate complex water flow conditions such as water flow and vortex in the water tank, so that the sample can be tested under different water flow conditions, and the stability of the sample under different water flow conditions can be comprehensively evaluated, so as to evaluate the comprehensive stability of the sample. The data acquisition component can collect the weight change and morphology change of the sample on the sample placement table. The stability of the sample under different water flow conditions can be determined by the weight change and morphology change of the sample under different water flow conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a revetment substrate water stability testing device provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of the structure of a flower-shaped magnetic stone provided in an embodiment of the present disclosure; Figure 3 A method flow chart of a method for evaluating water stability of a bank protection substrate provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of a parameter standard range provided for an embodiment of the present disclosure.

[0019] The accompanying drawings are as follows: 1: sample test assembly; 11: water tank; 111: wireless control water valve; 112: liquid level sensor; 12: sample table; 121: filter screen; 122: nylon rope; 123: sample; 124: hook; 13: top plate; 14: stand; 15: beam; 16: buckle; 17: lockable universal wheel; 18: bolt; 2: data acquisition component; 21: shape detection unit; 22: weight detection unit; 23: timing unit; 3: Test condition simulation component; 31: Water flow simulation unit; 311: Water pump; 312: Water pipe; 313: Movable part; 3131: Column; 3132: Sliding guide rail; 314: Fixer; 315: Water storage; 32: Complex water flow simulation unit; 321: Magnetic part; 3211: Main body; 3212: First rotating part; 3213: Second rotating part; 3214: Third rotating part; 322: Speed ​​electromagnetic sensor; 33: Vibration simulation unit: 331: Vibration table; 332: Vibration sensor; 4: Evaluation module. Specific implementation methods In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of a revetment substrate water stability test device provided by an embodiment of the present disclosure. Figure 1 , the device comprises: The sample test assembly 1 comprises a water tank 11, a sample placement platform 12 and a top plate 13, wherein the top plate 13 is arranged on the top of the water tank 11, and the sample placement platform 12 is suspended inside the water tank 11 through the top plate 13; The data acquisition component 2 includes a shape detection unit 21 and a weight detection unit 22, wherein the shape detection unit 21 is used to obtain shape changes of the sample on the sample placement platform 12, and the weight detection unit 22 is used to obtain weight changes of the sample on the sample placement platform 12; Test condition simulation component 3, including: The water flow simulation unit 31 includes a pump group 311 and a water pipe 312. The water flow simulation unit 31 can control the pump group 311 to extract water from the water tank 11 through the water pipe 312, and transport the extracted water to the water tank 11 again to form a water flow in the water tank 11; The complex water flow simulation unit 32 includes a rotatable component, and the rotatable component can be rotated to form a complex water flow in the water tank; The evaluation module 4 is used to obtain the morphological changes and weight changes collected by the data collection component 2, and evaluate the stability of the sample based on the weight changes and the morphological changes.

[0022] In an embodiment of the present disclosure, a water stability test device for a bank protection substrate is provided, and the test device includes a sample test component, and the sample test component is used to suspend the sample inside a water tank through a sample placement table to facilitate subsequent testing of the sample. The test condition simulation component can simulate different water flow conditions such as water flow and vortex in the water tank, so that the sample can be tested under different water flow conditions, and the stability of the sample under different water flow conditions can be comprehensively evaluated, so as to evaluate the comprehensive stability of the sample. The data acquisition component can collect the weight change and morphology change of the sample on the sample placement table. The stability of the sample under different water flow conditions can be determined by the weight change and morphology change of the sample under different water flow conditions.

[0023] In the embodiment of the present disclosure, the test condition simulation component 3 further includes: The vibration simulation unit 33 includes a vibration table 331 and a vibration sensor 332 . The vibration table 331 is disposed at the bottom of the water tank 11 , and the vibration sensor 332 is disposed inside the vibration table 331 .

[0024] In the embodiment of the present disclosure, the water flow situation under the vibration environment can be further simulated by using a vibration table and a vibration sensor to test the water stability of the sample under the vibration condition.

[0025] It is worth noting that, in the embodiment of the present disclosure, the water tank 11 is fixed on the vibration table 331 , and the bottom of the water tank 11 is sealed by the vibration table 331 .

[0026] In the disclosed embodiment, the vibration frequency of the vibration sensor 332 is 1-2000 Hz.

[0027] Exemplarily, the vibration frequency of the vibration sensor 332 is 500 Hz.

[0028] In the disclosed embodiment, a plurality of wirelessly controlled water valves 111 are disposed on the side of the water tank 11 , and the wirelessly controlled water valves 111 are used to fill water into the water tank 11 or drain water from the water tank 11 .

[0029] The wireless controlled water valve 111 on the left side of the water tank 11 is used to drain the water in the water tank 11 , and the wireless controlled water valve 111 on the right side of the water tank 11 is used to fill water into the water tank 11 .

[0030] In the disclosed embodiment, by providing a wirelessly controlled water valve, the water valve can be remotely controlled to fill water into or drain water from the water tank, making it more convenient for users to operate.

[0031] In the disclosed embodiment, a liquid level sensor 112 is disposed in the water tank 11 .

[0032] In the embodiment of the present disclosure, a vibration table 331 is provided at the bottom of the water tank 11 , and the water tank 11 is a cylindrical structure, and the bottom of the water tank 11 is sealed with the vibration table 331 .

[0033] In the disclosed embodiment, the bottom of the water tank 11 is fixedly connected to the vibration table 331 via a buckle 16 .

[0034] In the embodiment of the present disclosure, the sample placement platform 12 includes a filter 121 , and the mesh size of the filter 121 is 3 to 5 times the limiting particle size in the sample 123 .

[0035] In the disclosed embodiment, the sample placing platform is used to carry the sample, and the sample placing platform is formed by using a filter screen. The sample will disintegrate under the immersion and flushing of water flow, and the part with poor cementation will be scattered into smaller agglomerates and fall into the water tank through the mesh of the filter screen, while the part with better cementation maintains better stability under the action of water flow, and is not easily flushed into the water tank by the water flow, and when the larger cementation body size is larger than the mesh of the filter screen, it cannot pass through the mesh of the filter screen and move into the water tank. Thus, through the filter screen, the change of the weight of the sample under the water flow condition can be simulated more accurately. The filter screen adopts the mesh size of the above range, which can ensure that the mesh size of the filter screen is not too large, and avoids the larger cementation body from moving from the mesh of the filter screen to the water tank. At the same time, it can also ensure that the mesh size of the filter screen is not too small, and avoids the smaller cementation body from being retained on the sample placing platform. By adjusting the mesh size of the filter screen, it is further ensured that the weight change of the sample obtained is caused by the loss of the cementation body of the specified size, which is convenient for the targeted analysis of the water stability of different soil substrates.

[0036] In the disclosed embodiment, a stand 14 and a crossbeam 15 are further provided on the vibration table 331, a lockable universal wheel 17 is provided at the bottom of the vibration table 331, the stand 14 and the vibration table 331 are fixed by a buckle 16, the crossbar 15 and the stand 14 are fixed by a bolt 18, and the water pump 311 is provided on the crossbar 15. The test device can be moved by the lockable universal wheel 17, and after the lockable universal wheel 17 is locked, the test device can be kept stationary.

[0037] In the disclosed embodiment, the pump set 311 is a pressurized air pump set, and the water pipe 312 includes a plurality of hoses; Movable parts 313 are arranged on both sides of the sample placement table 12, a part of the multiple hoses are arranged on the movable part 313 on one side of the sample placement table 12, and a part of the multiple hoses are connected to the water inlet end of the pressurized air pump group, another part of the multiple hoses are arranged on the movable part 313 on the other side of the sample placement table 12, and another part of the multiple hoses are connected to the water outlet end of the pressurized air pump group; the movable part 313 can adjust the distance between the hose and the sample placement table 12 by moving.

[0038] In the disclosed embodiment, the flow rate of water in each hose can be controlled by a pressurized air pump group. The flow rate of water in a river is different under different water depth conditions. The pressurized air pump group can more accurately simulate the water flow conditions under different water depth conditions, thereby improving the accuracy of the test. The movable parts arranged on both sides of the sample placement table can adjust the distance between the hose and the sample placement table, thereby adjusting the distance between the hose and the sample. The movable parts can be used to test the weight change and morphology change of the sample when the hose and the sample are at different distances.

[0039] In the embodiment of the present disclosure, one end of the hose away from the pressurized air pump group is fixed to the movable member 313 via a fixer 314, and the fixer 314 can control the one end of the hose away from the pressurized air pump group to rotate.

[0040] In the embodiment of the present disclosure, the hose can move up and down along the column 3131 and rotate 360° around the column 3131 through the fixture 314 .

[0041] In the disclosed embodiment, the pressurized air pump pumps the water in the water tank 11 to the water storage 315 through the water pipe 312, and then transports the water to the water tank again through the water pipe 312 to form a water flow.

[0042] In the disclosed embodiment, the hoses are evenly spaced on the column 3131 according to the height of the sample.

[0043] In the embodiment of the present disclosure, the orientation of the end of the hose away from the pressurized air pump group can be adjusted by the fixture, so that the weight change and morphology change of the sample when the hose is in different orientations can be obtained through the fixture. The different orientations of the hose correspond to the different flow directions of water in the river in actual situations, so that the water flow conditions in the actual river can be further accurately simulated.

[0044] In the embodiment of the present disclosure, the complex water flow simulation unit 32 includes a rotatable component, and the rotatable component includes: The magnetic component 321 and the rotation speed electromagnetic sensor 322 are connected to the magnetic component 321 , and the rotation speed electromagnetic sensor 322 is used to control the rotation speed and direction of the magnetic component 321 .

[0045] In the disclosed embodiment, a magnetic component and a rotation speed electromagnetic sensor are provided, and the rotation speed electromagnetic sensor drives the magnetic component to rotate. The rotation of the magnetic component in turn drives the water in the water tank to rotate, thereby forming a vortex in the water tank.

[0046] In the embodiment of the present disclosure, the magnetic part 321 is a flower-shaped magnetic stone, and the speed electromagnetic sensor 322 is placed at the center of the bottom of the water tank 11 (that is, at the center of the vibration table). The speed electromagnetic sensor 322 is connected to the flower-shaped magnetic stone, which can control the speed and direction of the flower-shaped magnetic stone and simulate the influence of complex water flow forms such as eddies and whirlpools.

[0047] In the disclosed embodiment, the rotation speed of the rotation speed electromagnetic sensor is 0~5000rpm.

[0048] Exemplarily, the rotation speed of the rotation speed electromagnetic sensor is 1400 rpm.

[0049] Figure 2 This is a structural diagram of a flower-shaped magnetic stone provided by an embodiment of the present disclosure. Figure 2 The flower-shaped magnetic stone (ie, the magnetic member) includes a main body 3211 , a first rotating member 3212 , a second rotating member 3213 and a third rotating member 3214 .

[0050] One end of the first rotating member 3212 , the second rotating member 3213 and the third rotating member 3214 is fixed on the surface of the main body 3211 in an inclined manner.

[0051] In the disclosed embodiment, the operator can obtain the total amount of water in the water tank in real time through the liquid level sensor, so that the operator can fill water into the water tank by remotely controlling the water valve.

[0052] See again Figure 1 In the embodiment of the present disclosure, the data acquisition component 2 includes: A shape detection unit 21 is arranged on the side of the water tank 11, and the height of the shape detection unit 21 is flush with the height of the geometric center of the sample 123 arranged on the sample placement platform 12; The weight detection unit 22 is disposed on the top plate 13 , and the top of the sample placement platform 12 is suspended on the weight detection unit 22 .

[0053] In the embodiment of the present disclosure, a morphology detection unit is arranged at the above-mentioned position so that the morphology detection unit can accurately obtain the morphology of the sample. The weight detection unit is arranged on the top plate, and the sample placement table is suspended on the weight detection unit, so that the weight detection unit can obtain the weight change of the sample in real time.

[0054] In the disclosed embodiment, the shape detection unit 21 may be a miniature infrared observation sensor, and the weight detection unit 22 may be a miniature electronic force sensor.

[0055] In the embodiment of the present disclosure, the data acquisition component 2 further includes a timing unit 23, which is used to obtain the test time. The timing unit 23 can be any type of timer, and the present disclosure does not impose any limitation on this.

[0056] In the disclosed embodiment, the sample placement table 12 is suspended on the weight detection unit 22 via the hook 124, so that the weight detection unit can obtain the weight change of the sample in real time.

[0057] Figure 3 A flow chart of a method for evaluating the stability of a bank protection substrate provided by an embodiment of the present disclosure. Figure 3 The method steps include: S101. Target water flow conditions of the simulation test experiment.

[0058] In one example, when performing the soak test, step S101 includes: After opening the wireless control water valve to supply water to the water tank to the designed water level, close the wireless control water valve and then conduct the test.

[0059] In another example, when testing is performed under water flow conditions, the target water flow condition is that water flows at a certain speed, and step S101 includes: Set the distance between the column and the sample to 20cm, open the wireless control water valve to supply water to the water tank to the designed water level, and then close the wireless control water valve; set the pressurized air pump group to make the water flow rate at the top of the sample 0.4m / s and the water flow rate at the bottom 0.2m / s, and the fixtures are evenly distributed on both sides of the sample at an interval of 4cm, and the angle with the center line of the sample is 45°. Start the pressurized air pump group to work, and conduct the test after the target water flow conditions are formed in the water tank.

[0060] In another example, when the test is performed under complex water flow conditions, the target water flow condition is a complex water flow, and step S101 includes: Adjust the distance between the column and the sample to 20cm; open the wireless control water valve to supply water to the water tank to the designed water level, and then close the wireless control water valve; set the pressurized air pump group to make the flow rate at the top and bottom of the sample 0.4m / s, and evenly distribute the fixtures on both sides of the sample at an interval of 4cm, and the direction of the fixtures is parallel to the sample, the speed of the speed electromagnetic sensor is set to 3000rpm, and the direction is clockwise, and the pressurized air pump group and the flower-shaped magnetic stone start working until the target water flow conditions are formed in the water tank before testing.

[0061] In another example, when testing is performed under vibration conditions, the target water flow condition is a complex water flow accompanied by vibration, and step S101 includes: Adjust the distance between the column and the sample to 20cm; open the wireless control water valve to supply water to the water tank to the designed water level, and then close the wireless control water valve; set the vibration sensor vibration frequency to 1000Hz and the vibration duration to 24h according to the test requirements; use the pressurized air pump group to make the water flow rate at the top and bottom of the sample 0.4m / s; evenly distribute the fixtures on both sides of the sample at intervals of 4cm, and the direction of the fixtures is parallel to the sample; start the pressurized air pump group and the flower-shaped magnetic stone to work until the target water flow conditions are formed in the water tank before testing.

[0062] S102, testing a plurality of samples under the target water flow conditions.

[0063] Place the sample on the sample placement table and turn on the data acquisition component to record the test data, which includes the sample's weight, morphology and test time.

[0064] Among them, testing multiple samples separately can ensure the accuracy of the measurement results and reduce the impact of errors on the measurement results.

[0065] S103, obtaining disintegration time of multiple samples.

[0066] The disintegration time refers to the time it takes for a sample to disintegrate in water and reach a stable state.

[0067] S104. Determine a normalized value of the sample disintegration time based on the disintegration times of the multiple samples.

[0068] In one example, step S104 includes: Step 1: Obtain the maximum disintegration time of multiple samples and minimum disintegration time .

[0069] The second step is to obtain the disintegration time of the current sample .

[0070] The third step is to normalize the disintegration time of the current sample for and ratio.

[0071] In the embodiments of the present disclosure, by obtaining the normalized value of the disintegration time of the current sample, the influence of the error on the test result can be further reduced, and the stability of the sample can be evaluated more accurately.

[0072] In the embodiments of the present disclosure, the smaller the normalized value of the disintegration time is, the better the water stability of the sample is.

[0073] S105. Obtain weight change and morphological change of the sample.

[0074] The morphological change is the change in the projected area of ​​the sample.

[0075] S106. Determine a normalized value of the disintegration rate and a mass loss rate of the sample based on the weight change.

[0076] In one example, step S106 includes: The first step is based on the formula Determine the disintegration rate of the current sample , is the weight change of the current sample.

[0077] The second step is to obtain the maximum disintegration rate of multiple samples and minimum disintegration rate .

[0078] The third step is based on the formula Determine the normalized value of the disintegration rate of the current sample .

[0079] Step 4: Based on the formula Determine the mass loss rate of the current sample , The mass of the current sample before testing.

[0080] in, , For sample quality after testing.

[0081] In the embodiments of the present disclosure, by obtaining the disintegration rate and mass loss rate of the sample, the disintegration rate and mass loss rate can further provide feedback on the stability of the sample, and further obtaining a normalized value of the disintegration rate of all samples can reduce the impact of errors on the measurement results and improve the accuracy of the evaluation process.

[0082] S107. Determine the morphological change rate of the sample based on the morphological change.

[0083] In one example, step S107 includes: Based on the formula Determine the morphological change rate of the current sample , is the projected area of ​​the current sample before testing, is the projected area of ​​the current sample after testing.

[0084] In the disclosed embodiment, the morphological changes of the sample can also provide feedback on the stability of the sample, and the morphological change rate of the sample can be obtained. The morphological change rate combined with other parameters can improve the accuracy of the evaluation results.

[0085] S108. Evaluate the sample based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate to determine the stability of the sample under target water flow conditions.

[0086] In one example, step S108 includes: The first step is to determine the disintegration time evaluation score, disintegration rate evaluation score, mass loss rate evaluation score and morphology change rate evaluation score of the sample based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate and the morphology change rate.

[0087] Among them, by defining the standard range of the normalized value of the disintegration time, the standard range of the normalized value of the disintegration rate, the standard range of the mass loss rate and the standard range of the morphology change rate, the disintegration time evaluation score, the disintegration rate evaluation score, the mass loss rate evaluation score and the morphology change rate evaluation score of the sample are determined by the position of the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate and the morphology change rate of the sample in the standard range.

[0088] In the second step, weights are added to the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate and the morphology change rate based on the target water flow condition.

[0089] The weights are used to indicate the influence of the normalized value of disintegration time, the normalized value of disintegration rate, the mass loss rate and the morphology change rate on the stability of the sample under the target water flow conditions.

[0090] For example, in the immersion test, the normalized value of disintegration time, the normalized value of disintegration rate, the mass loss rate and the morphological change rate have the same influence on the sample, that is, the weight of the normalized value of disintegration time , the weight of the normalized value of the disintegration rate , weight of mass loss rate and the weight of the morphological change rate Both are 0.25.

[0091] For example, under water flow test, the normalized value of disintegration time, the normalized value of disintegration rate, and the mass loss rate will be more accurate in evaluating the stability of the sample, while the morphological change rate is only used as an auxiliary parameter to evaluate the stability of the sample. Therefore, the weight of the morphological change rate will be lower. By analyzing the influence of each evaluation parameter on the sample under different water flow conditions and determining the weight of the evaluation parameter, the stability of the sample can be evaluated more accurately.

[0092] For example, under the water flow test, = = =0.28, =0.16.

[0093] However, for complex water flow conditions, such as vortex or vibration conditions, = = =0.32, =0.04.

[0094] The third step is to determine the water stability evaluation score of the sample based on the disintegration time evaluation score, disintegration rate evaluation score, mass loss rate evaluation score, morphology change rate evaluation score and the weight of the sample.

[0095] Among them, the sample disintegration time evaluation score Weight of the sample disintegration time evaluation score Multiply the disintegration rate evaluation score by Weight of disintegration rate evaluation score Multiply the mass loss rate evaluation score by Weight of the mass loss rate evaluation score Multiply the morphological change rate evaluation score Weights of morphological change rates Multiply and add the above multiple products to obtain the stability evaluation score of the sample.

[0096] That is, ,in Provide a score for the stability evaluation of the sample.

[0097] The fourth step is to determine the stability of the sample based on the stability evaluation score.

[0098] Define a standard range for the water stability evaluation score, and determine the water stability of the sample based on the position of the water stability evaluation score within the marked range.

[0099] In the disclosed embodiment, weights are added to multiple evaluation parameters according to water flow conditions, and the stability evaluation score of the sample is determined based on the evaluation parameters and the weights to evaluate the water stability of the sample. The stability of the sample can be accurately evaluated under any water flow conditions.

[0100] For example, S∈[100, 90], the water stability performance is excellent; S∈(90, 75], the water stability performance is good; S∈(75, 60], the water stability performance is fair; S∈(40, 60], the water stability performance is poor; S∈[0, 40], the water stability performance is poor. Wherein, S is the water stability evaluation score of the sample.

[0101] In an embodiment of the present disclosure, a method for evaluating water stability is provided, in which the stability of a sample is evaluated using the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate, which can improve the accuracy of the evaluation results.

[0102] Figure 4 A schematic diagram of a parameter standard range provided by an embodiment of the present disclosure. Figure 4 , which shows the normalized value of disintegration time, the normalized value of disintegration rate, the standard range of mass loss rate and morphological change rate, and also shows the evaluation score corresponding to the standard range.

[0103] Among them, the normalized value evaluation score of the disintegration time is a1, the normalized value evaluation score of the disintegration rate is a2, the mass loss rate evaluation score is a3, and the morphology change rate evaluation score is a4.

[0104] Standardizing the range of a1, a2, a3, and a4 to 0-100 facilitates the subsequent evaluation of sample stability using stability evaluation scores.

[0105] The present disclosure also provides test data of the immersion experiment, as follows: In this test, sandy soil solidified with 0.25%, 0.5%, 1.0%, 1.5% and 2% xanthan gum was used as test samples, and they were numbered as sample 1, sample 2, sample 3, sample 4 and sample 5 respectively. All five test samples were cylindrical samples with a diameter of 50 mm, a height of 10 mm and a mass of 33.18 g. All five samples were cured for 28 days under standard curing conditions. The water stability of sample 4 was evaluated. Other sample test parameters were required when evaluating sample 4.

[0106] After the immersion test, the five tested samples had the longest disintegration time The shortest disintegration time is 600min The disintegration time of sample 4 was 130 min. It is 522 minutes.

[0107] After calculation, we get: The normalized value of disintegration time of sample 4 is:

[0108] .

[0109] The test sample has a minimum disintegration rate of The maximum disintegration rate is The disintegration rate of sample 4 is .

[0110] The normalized value of the disintegration rate of sample 4 is:

[0111] .

[0112] The mass loss rate of sample 4 is .

[0113] The morphological change rate of sample 4 is: .

[0114] According to the above evaluation parameters, we get: Sample 4 evaluation score =83, =93.2, =82, =70; The stability evaluation score of sample 4 is obtained as follows:

[0115] . According to the evaluation score, it can be obtained that the stability of sample 4 in the immersion test is "good".

[0116] The present disclosure also provides a test experiment under the action of water flow or ship-borne waves, as follows: In this test, sandy soil solidified with 0.25%, 0.5%, 1.0%, 1.5% and 2% xanthan gum was used as test samples, and they were numbered as sample 1, sample 2, sample 3, sample 4 and sample 5 respectively. All five test samples were cylindrical samples with a diameter of 50 mm, a height of 10 mm and a mass of 33.18 g. All five samples were cured for 28 days under standard curing conditions. The water stability of sample 4 was evaluated. Other sample test parameters were required when evaluating sample 4.

[0117] After the test under the action of water flow or ship waves, the five test samples had the longest disintegration time. The shortest disintegration time is 500min The disintegration time of sample 4 was 100 min. It is 450 minutes.

[0118] After calculation, we get: The normalized value of disintegration time of sample 4 is:

[0119] .

[0120] The test sample has a minimum disintegration rate The maximum disintegration rate is The disintegration rate of sample 4 is .

[0121] The normalized value of the disintegration rate is:

[0122] .

[0123] The mass loss rate of sample 4 is ,.

[0124] The morphological change rate of sample 4 is: .

[0125] According to the above evaluation parameters, we get: Sample 4 evaluation score =87.5, =94, =69, =69;.

[0126] The stability evaluation score of sample 4 is obtained as follows:

[0127] .

[0128] According to the evaluation score, the stability of sample 4 in the test under the action of water flow or ship waves is "good".

[0129] Finally, it is worth mentioning that the present invention provides a revetment base material stability testing device and evaluation method thereof, which have the following advantages: First, it can simply and effectively study the water stability performance of the bank protection substrate under real water flow conditions in different scenarios, and can automatically monitor and collect data with high accuracy and easy operation.

[0130] Second, by arranging a plurality of pressurized air pumps to form a pressurized air pump group, as well as hoses, fixtures and columns, the effects of actual water flow and water flow fluctuations can be simply and effectively realized.

[0131] Third, by setting up the speed electromagnetic sensor and the flower-shaped magnetic stone (magnetic part), the influence of complex water flow forms such as eddy current, turbulence and vortex in reality can be simply and effectively simulated, and the test results are more realistic; Fourth, the present invention can realize the effects of static immersion, water flow and fluctuation, eddy current and vortex, and vibration, and can be combined according to actual conditions. The device is simple and easy to operate, can be reused, and saves test costs; Fifth, the immersion test mainly focuses on the water stability of the revetment substrate under static conditions. Each parameter is equally important in reflecting the water stability, so the weight coefficients of each parameter are the same; under the action of water flow or ship waves, due to the influence of water flow, the disintegration time, disintegration rate and mass loss rate can better reflect the changes in water stability, so the weight coefficient increases; under the action of complex water flow, the weight coefficients of disintegration time, disintegration rate and mass loss rate are further increased, and the influence of the morphological change rate is weakened. By reasonably setting the weight coefficients, the water stability of the revetment under different conditions can be more accurately evaluated.

[0132] Sixth, the present invention can not only study the water stability of soil and substrate under real water flow conditions in different scenarios, but also study the anti-scouring and anti-erosion capabilities of soil and substrate, and has a wide range of application scenarios.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water stability testing device for bank protection substrate, characterized in that: include: The sample test assembly comprises a water tank, a sample placement platform and a top plate, wherein the top plate is arranged on the top of the water tank, and the sample placement platform is suspended inside the water tank through the top plate; The data acquisition component includes a shape detection unit and a weight detection unit, wherein the shape detection unit is used to obtain shape changes of the sample on the sample placement table, and the weight detection unit is used to obtain weight changes of the sample on the sample placement table; Test condition simulation components, including: A water flow simulation unit, comprising a pump group and a water pipe, wherein the water flow simulation unit can control the pump group to extract water from the water tank through the water pipe and transport the extracted water to the water tank again to form a target water flow in the water tank; A complex water flow simulation unit, comprising a rotatable component, wherein the rotatable component can be rotated to form a complex water flow in the water tank; An evaluation module is used to obtain the morphological changes and weight changes collected by the data acquisition component, and evaluate the stability of the sample based on the weight changes and the morphological changes.

2. The revetment base material water stability testing device according to claim 1, characterized in that: The sample placement platform comprises a filter screen, and the mesh size of the filter screen is 3 to 5 times the limiting particle size in the sample.

3. The revetment base material water stability testing device according to claim 1, characterized in that: The pump group is a pressurized air pump group, and the water pipe includes a plurality of hoses; Movable parts are arranged on both sides of the sample placement table, a part of the multiple hoses is arranged on the movable part on one side of the sample placement table, and a part of the multiple hoses is connected to the water inlet end of the pressurized air pump group; another part of the multiple hoses is arranged on the movable part on the other side of the sample placement table, and another part of the multiple hoses is connected to the water outlet end of the pressurized air pump group; the movable part can adjust the distance between the hoses and the sample placement table by moving.

4. The revetment base material water stability testing device according to claim 3, characterized in that: One end of the hose away from the pressurized air pump group is fixed to the movable member through a fixer, and the fixer can control the end of the hose away from the pressurized air pump group to rotate.

5. The revetment base material water stability testing device according to claim 1, characterized in that: The rotatable component comprises: A magnetic component and a rotation speed electromagnetic sensor, wherein the rotation speed electromagnetic sensor is connected to the magnetic component and is used to control the rotation speed and direction of the magnetic component.

6. A method for evaluating water stability of a bank protection substrate, characterized in that: The method is applied to the revetment substrate stability testing device according to any one of claims 1 to 5, and the method comprises: Simulate target flow conditions for test trials; Testing a plurality of samples under the target water flow conditions; Obtain disintegration times for multiple samples; Determining a normalized value of the sample disintegration time based on the disintegration times of the plurality of samples; Obtain weight and morphological changes of samples; Determining a normalized value of the disintegration rate and a mass loss rate of the sample based on the weight change; determining a morphological change rate of the sample based on the morphological change; The sample is evaluated based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate to determine the stability of the sample under target water flow conditions.

7. The method for evaluating water stability of bank protection substrate according to claim 6, characterized in that: Based on the disintegration time of multiple samples, a normalized value of the sample disintegration time is determined, including: Get the maximum disintegration time of multiple samples and minimum disintegration time ; Get the disintegration time of the current sample ; Normalized value of disintegration time of the current sample for and ratio.

8. The method for evaluating water stability of bank protection substrate according to claim 7, characterized in that: Determining a normalized value of the disintegration rate and a mass loss rate of the sample based on the weight change comprises: Based on the formula Determine the disintegration rate of the current sample , is the weight change of the current sample; Get the maximum disintegration rate of multiple samples and minimum disintegration rate ; Based on the formula Determine the normalized value of the disintegration rate of the current sample ; Based on the formula Determine the mass loss rate of the current sample , The mass of the current sample before testing.

9. The method for evaluating water stability of bank protection substrate according to claim 6, characterized in that: Determining the morphological change rate of the sample based on the morphological change comprises: Based on the formula Determine the morphological change rate of the current sample , is the projected area of ​​the current sample before testing, is the projected area of ​​the current sample after testing.

10. The method for evaluating water stability of bank protection substrate according to claim 6, characterized in that: Based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate, the sample is evaluated to determine the stability of the sample under target water flow conditions, including: Determining the disintegration time evaluation score, the disintegration rate evaluation score, the mass loss rate evaluation score, and the morphology change rate evaluation score of the sample based on the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate; adding weights to the normalized value of the disintegration time, the normalized value of the disintegration rate, the mass loss rate, and the morphology change rate, respectively, based on the target water flow condition; Determining the stability evaluation score of the sample based on the disintegration time evaluation score, disintegration rate evaluation score, mass loss rate evaluation score, morphology change rate evaluation score and the weight of the sample; The stability of the sample is determined based on the stability evaluation score.

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