Dynamic water disintegration device for solidified soil and test method

Abstract

The invention provides a flowing water disintegration device for solidified soil and a test method, the flowing water disintegration device comprises a multi-path branch control water pump, the multi-path branch control water pump is connected with a water tank through a double-inlet switching valve and provides flowing water flow, and the multi-path branch control water pump is connected with a circular section ring pipeline; a flow equalizing pore plate, a water flow velocity probe, a dynamic water coupling test unit, a blow-down valve and a filter screen are arranged in the circular section ring pipeline. Through the synergistic effect of the multi-path branch control water pumps and the flow equalizing pore plate, a stable and adjustable flow equalizing field can be generated in the circular section ring pipeline; meanwhile, on the basis of a weighing device and a buoyancy dynamic compensation algorithm built in the dynamic water coupling test unit, a solidified soil residual dry mass-time change curve is quantified and output in real time, and in-situ monitoring of the whole disintegration process is achieved.

Description

Technical Field

[0001] This invention relates to the field of solidified soil disintegration testing technology, and mainly to a dynamic water disintegration device and testing method for solidified soil. Background Technology

[0002] Solidified soil is widely used in dams, roadbeds, and other engineering projects. Its resistance to disintegration in dynamic water environments directly affects the durability of these projects. However, there is currently a lack of devices and testing methods specifically designed for solidified soil. Existing evaluation devices are mainly derived from other fields: dynamic water disintegration devices (such as rotary sieve disintegration testers) are primarily used to test the disintegration resistance of rocks. For solidified soil samples, the disintegration effect is too strong, causing the samples to disintegrate rapidly and completely, making it impossible to distinguish the differences in disintegration resistance of solidified soil under different mix proportions or treatment processes. On the other hand, static water disintegration apparatus is mainly used to test unsolidified natural or artificial soil. Its disintegration intensity is too mild, resulting in too low a disintegration amount and rate of solidified soil in a short time, making it difficult to effectively quantify its disintegration resistance. Both of these borrowed methods cannot accurately simulate the specific water flow conditions encountered by solidified soil in actual engineering projects, leading to significant deviations between the evaluation results and the actual disintegration resistance under actual service conditions, and failing to provide a reliable basis for engineering design and material optimization. Therefore, there is an urgent need to develop a dynamic water disintegration test device and method specifically for the properties of solidified soil materials to fill the gap in this key evaluation method.

[0003] For example, CN110954677A discloses a soil sample disintegration test apparatus and method under dynamic water flow. The protected claim "includes a soil sample disintegration component, which includes a weighing device, a lifting device, and a holding device. The weighing device is connected to the lifting device, which drives the holding device to reciprocate vertically. The test apparatus also includes a test tube, a blowing / suction device, and a sealed box with a sealing cover. The test tube is placed horizontally, and the sealed box is located above the test tube, with its bottom connected to the test tube. The sidewall of the sealed box is sealed to the wall of the test tube. The blowing / suction device is used to introduce or expel air into the sealed box, and the soil sample disintegration component is located inside the sealed box." However, its structure lacks a water pump and flow equalization device, relying solely on gravity head to form a constant unidirectional flow. This results in uneven velocity distribution within the pipe, failing to simulate various velocity conditions in actual dynamic water environments. Given the significant differences in velocity characteristics under different hydrological environments, a water pump and flow equalization device capable of active velocity control are crucial for constructing a spatially uniform flow field. Furthermore, the structure lacks a rotary drive device, leaving the soil sample in a static suspended state, making it difficult to achieve multi-angle and uniform scouring. Adding a rotary drive device is of great significance in more realistically simulating the scouring of riverbeds, banks, and other soils under actual water flow.

[0004] CN108020482A discloses a dynamic water disintegration sieving test device and method, the protected claim of which "includes a disintegration sieving test barrel, a dynamic water guiding device, and a circulating water pump system. The disintegration sieving test barrel includes a test barrel frame, a slot, a sieve plate, a test barrel cover, a filter screen, etc.; the dynamic water guiding device includes a guiding channel, an inlet, an outlet, and a nozzle. The guiding channel is bonded to the frame of the disintegration sieving test barrel with a water-resistant adhesive. The nozzle is disposed between the guiding channel and the guide tube, the purpose of which is to guide the water flow in the guiding channel." The flow is close to laminar flow. The circulating water pump system includes a water pump, water pump valves, and conduits. The water pump provides power to the water, and the flow channel acts as a buffer zone. The flow rate can be quantitatively controlled according to the pumping power of the water pump, resulting in disintegration rates at different flow rates and sieve materials of different particle sizes. The proportion of each particle size in the disintegration material can be accurately measured. It features accurate testing, simple and practical design, light weight, and easy mobility. However, this structure lacks a ring-shaped flow equalization pipeline system and an in-situ real-time mass monitoring device. The existing device uses a combination of a straight flow channel and a single water pump, relying solely on the nozzle and flow channel to provide water flow. It is difficult to form a highly uniform flow field throughout the test area, and it cannot simulate the various flow rate conditions in actual dynamic water environments. More importantly, the determination of the disintegration amount requires manual collection, drying, and weighing after the test, which is cumbersome, inefficient, and cannot achieve real-time data acquisition of the disintegration process.

[0005] CN120195375A discloses a portable device for real-time monitoring of modular multi-stage soil disintegration. The protected claim "includes an upper frame tray, a lower soil sample fixing tray, supporting components, and multiple sets of screening discs. Through the application of automated data acquisition technology, it integrates tensile sensors and cameras to record the rate of change and morphological evolution of disintegration tensile force in real time." However, this structure lacks a dynamic water environment simulation device, relying solely on a static water tank for water supply. It cannot generate water flow with a controllable velocity, thus making it difficult to simulate the dynamic water scouring environment in actual engineering projects. Due to its structural limitations, this device is only suitable for observing the disintegration of natural soil under static water immersion conditions and cannot be used to evaluate the disintegration resistance of engineered solidified soil under dynamic water scouring.

[0006] In summary, the existing soil disintegration devices and testing methods have the following shortcomings: insufficient ability to simulate real dynamic water environments, resulting in distortion of the soil disintegration mechanism; and lack of real-time, in-situ, and reliable monitoring of key indicators (mass loss) in the disintegration process. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a dynamic water disintegration device and testing method for solidified soil. This invention utilizes the synergistic effect of multiple separately controlled water pumps and a flow equalization orifice plate to generate a stable and adjustable flow field within a circular cross-section annular pipe. Simultaneously, based on the built-in weighing device and buoyancy dynamic compensation algorithm within the dynamic water coupling testing unit, it quantifies and outputs the residual dry mass-time variation curve of the solidified soil in real time, achieving in-situ monitoring of the entire disintegration process.

[0008] To achieve the above-mentioned technical features, the present invention aims to provide a dynamic water disintegration device for solidified soil, comprising a multi-channel separately controlled water pump, which is connected to a water tank via a dual-inlet switching valve and provides flowing water. The multi-channel separately controlled water pump is connected to a circular cross-section ring pipe. The circular cross-section ring pipe is equipped with a flow equalization orifice plate, a water flow velocity probe, a dynamic water coupling test unit, a drain valve, and a filter screen.

[0009] Preferably, the hydrodynamic coupling test unit is equipped with a fixing screw hole, a control panel, a rotating lifting rod, a sample chamber, and an internal weighing device; the rotating lifting rod can extend and retract in the vertical direction and rotate in the horizontal direction; the control panel is used to control the extension and retraction length and horizontal rotation speed of the rotating lifting rod, and the weight of the sample chamber can be displayed on the display screen of the control panel.

[0010] Preferably, the multi-channel control water pump is equipped with a control panel and multiple outlets. The flow rate of each outlet is controlled independently by the control panel, and the flow rate detected by the water flow velocity probe in the pipeline is displayed on the control panel of the multi-channel control water pump.

[0011] Preferably, the flow equalization plate has regular holes to ensure uniform water flow velocity distribution across the pipe cross-section.

[0012] Preferably, the dual-inlet switching valve is equipped with a switching valve, which allows water to flow from the external water source inlet or the internal circulation inlet to the outlet by rotating the switching valve.

[0013] Preferably, the circular cross-section ring pipe has a channel at the dynamic water coupling test unit to facilitate the removal and placement of the dynamic water coupling test unit, and a pipe stabilizing support is provided on the outside of the circular cross-section ring pipe.

[0014] Another aspect of the present invention provides a test method for a dynamic water disintegration device for solidified soil, comprising the following steps: Step 1: Connect the water tank, dual-inlet switching valve, multi-way control water pump, and circular cross-section ring pipe in sequence; Step 2: Turn the switching valve to open the multi-way control water pump switch, adjust the water pump flow rate, so that the water flows into and fills the entire circular cross-section ring pipe and water tank from the external water source inlet. Turn the switching valve again to close the external water source inlet and open the internal circulation inlet, so that the water flows in and circulates within the system. Step 3: Based on the data monitored by the water flow velocity probe, adjust the flow velocity at the outlet of each water pump through the control panel of the multi-channel water pump until the data from the two water flow velocity probes are the same or the difference is within a reasonable range. Step 4: [The following appears to be a separate, unrelated section:] The density is... The cylindrical sample is placed in the sample chamber of the hydrodynamic coupling test unit. The hydrodynamic coupling test unit is placed in the reserved hole of the circular cross-section ring pipe and fixed with fixing screws inserted into the fixing screw holes. The control panel is used to adjust the extension length of the rotating lifting rod and the horizontal rotation speed so that the sample chamber is completely immersed in the water flow and rotates at a uniform speed in the water. Step 5: Input the water flow density in the control panel of the hydrodynamic coupling test unit. and sample density Based on the buoyancy dynamic compensation algorithm, the underwater force value of the sample collected by the weighing device is converted into residual dry weight data in real time, and the residual dry mass-time change curve is generated on the control panel. The specific dynamic buoyancy compensation algorithm is as follows: The forces acting on the vertical interface of the sample when it is placed in the sample chamber in the water flow: ; Given: ; The dry weight of the sample is: ; in, This refers to the real-time measurement value output by the weighing device when the sample chamber contains the sample submerged in the water flow. The buoyancy of the liquid on the sample chamber without the sample. The buoyancy of the liquid on the sample is denoted as . The mass of the sample chamber excluding the sample. For the mass of the sample, The density of the liquid is the water flow. The density of the sample, This refers to the volume of the sample chamber excluding the sample. The volume of the sample is denoted by ; where the volume of the sample chamber does not include the volume of the sample. and quality It is fixed and known; Step Six: After the test, loosen the fixing screws, remove the hydrodynamic coupling test unit, open the drain valve, and collect the sample soil that has been washed away in the pipeline.

[0015] The present invention has the following beneficial effects: 1. This invention utilizes the synergistic effect of multiple separately controlled water pumps and flow equalization orifice plates to generate a stable and adjustable flow field within a ring-shaped pipeline. Compared to rotary screen cylinder type disintegration testers and static water disintegration testers, this device can simulate the progressive erosion of solidified soil by uniform dynamic water flow, providing disintegration data under realistic hydrological conditions for projects such as dams and roadbeds.

[0016] 2. The dynamic-hydraulic coupling test unit of this invention integrates horizontal rotation and vertical lifting dual-degree-of-freedom motion, driving the sample to receive uniform scouring in the stable laminar flow constructed by the flow equalization orifice plate.

[0017] 3. The hydrodynamic coupling test unit of this invention incorporates a built-in weighing device combined with a dynamic buoyancy compensation algorithm. It collects the residual dry mass of the sample every second and automatically generates a disintegration evolution curve, which more accurately displays the sample disintegration situation.

[0018] 4. This invention uses multi-channel split-control water pumps to precisely regulate the water flow velocity inside the circular cross-section ring pipe, which can more accurately simulate the scouring mode of the bank slope drawdown zone when subjected to wave immersion. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the system layout of the present invention.

[0021] Figure 2 This is a schematic diagram of the multi-channel control water pump structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the flow equalization orifice plate structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the dynamic-water coupling test unit structure.

[0024] Figure 5 This is a schematic diagram of a dual-inlet switching valve.

[0025] In the diagram: 1. Multi-channel control water pump; 2. Circular cross-section ring pipe; 3. Pipe stabilizing support; 4. Flow equalization orifice plate; 5. Water flow velocity probe; 6. Dynamic-hydraulic coupling test unit; 7. Sewage valve; 8. Filter screen; 9. Water tank; 10. Dual inlet switching valve. Control panel 1.1; water outlet 1.2; hole 3.1; 4.1 Fixing screw holes, 4.2 Control panel, 4.3 Rotary lifting rod, 4.4 Sample chamber; Switching valve 10.1, water outlet 10.2, external water source inlet 10.3, internal circulation inlet 10.4. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1: See Figure 1-5 A dynamic water disintegration device and test method for solidified soil, characterized in that it includes a multi-channel control water pump 1, which is connected to a water tank 9 through a dual-inlet switching valve 10 and provides flowing water. The multi-channel control water pump 1 is connected to a circular cross-section ring pipe 2. The circular cross-section ring pipe 2 is provided with a flow equalization orifice plate 4, a water flow velocity probe 5, a dynamic water coupling test unit 6, a drain valve 7, and a filter screen 8.

[0028] Furthermore, the hydrodynamic coupling test unit 6 is equipped with a fixing screw hole 4.1, a control panel 4.2, a rotating lifting rod 4.3, a sample chamber 4.4, and an internal weighing device; the rotating lifting rod 4.3 can extend and retract in the vertical direction and rotate in the horizontal direction; the control panel 4.2 can control the extension length and horizontal rotation speed of the rotating lifting rod 4.3, and the weight of the sample chamber 4.4 can be displayed on the display screen of the control panel 4.2.

[0029] Furthermore, the multi-channel control water pump 1 is equipped with a control panel 1.1 and multiple water outlets 1.2, and the flow rate of each water outlet can be individually controlled by the control panel 1.1. At the same time, the water flow rate detected by the water flow velocity probe 5 in the pipeline will be displayed on the control panel 1.1 of the multi-channel control water pump 1.

[0030] Furthermore, the flow equalization plate 4 is provided with regular holes 3.1 to make the water flow velocity distribution in the pipe cross section uniform.

[0031] Furthermore, the dual-inlet switching valve 10 is equipped with a switching valve 10.1. By rotating the switching valve 10.1, the water flow can be set from the external water source inlet 10.3 or the internal circulation inlet 10.4 to the outlet 10.2.

[0032] Furthermore, the circular cross-section annular pipe 2 has a channel at the hydrodynamic coupling test unit 6 to facilitate the removal and placement of the hydrodynamic coupling test unit 6. A pipe stabilizing support 3 is provided on the outside of the circular cross-section annular pipe 2.

[0033] Example 2: A dynamic water disintegration device and testing method for solidified soil, comprising the following steps: Step 1: Connect the water tank 9, the dual-inlet switching valve 10, the multi-way control water pump 1, and the circular cross-section ring pipe 2 in sequence.

[0034] Step 2: Turn on the switching valve 10.1 to open the multi-way control water pump 1 switch, and adjust the water pump flow rate so that water flows into and fills the entire circular cross-section ring pipe 2 and water tank 9 from the external water source inlet 10.3. Turn the switching valve 10.1 again to close the external water source inlet 10.3 and open the internal circulation inlet 10.4, allowing the water to circulate within the system.

[0035] Step 3: Based on the data monitored by the water flow velocity probe 5, adjust the flow velocity of each water pump outlet 1.2 through the control panel 1.1 of the multi-channel sub-control water pump 1 until the data from the two water flow velocity probes 5 are the same or the difference is within a reasonable range.

[0036] Step 4: [The following appears to be a separate, unrelated section:] The density is... The cylindrical sample is placed in the sample chamber 4.4 of the hydrodynamic coupling test unit 6. The hydrodynamic coupling test unit 6 is placed in the reserved hole position of the circular cross-section ring pipe 2 and fixed with fixing screws inserted into the fixing screw holes 4.1. The control panel 4.2 adjusts the extension length of the rotating lifting rod 4.3 and the horizontal rotation speed so that the sample chamber 4.4 is completely immersed in the water flow and rotates at a uniform speed in the water.

[0037] Step 5: Input the water flow density in control panel 4.2 of the hydrodynamic coupling test unit 6. and sample density Based on the buoyancy dynamic compensation algorithm, the underwater force value of the sample collected by the weighing device is converted into residual dry weight data in real time, and the residual dry mass-time change curve is generated on the control panel 4.2.

[0038] The specific dynamic buoyancy compensation algorithm is as follows: The volume of water drained when the sample chamber is unloaded is known. and quality ; The forces acting on the vertical interface of the sample when it is placed in the sample chamber in the water flow: ; Given: ; The dry weight of the sample can be obtained as follows: ; in, This refers to the real-time measurement value output by the weighing device when the sample chamber contains the sample submerged in the water flow. The buoyancy of the liquid on the sample chamber (excluding the sample) is buoyant. The buoyancy of the liquid on the sample is denoted as . The mass of the sample chamber (excluding the sample). For the mass of the sample, The density of the liquid is the water flow. The density of the sample, This refers to the volume of the sample chamber (excluding the sample). This refers to the volume of the sample. The volume of the sample chamber (excluding the sample) is also included. and quality It is fixed and known.

[0039] Step 6: After the test, loosen the fixing screws, remove the hydrodynamic coupling test unit 6, open the drain valve 7, and collect the sample soil that has been washed away in the pipeline.

Claims

1. A dynamic water disintegration device for solidified soil, characterized in that, It includes a multi-channel control water pump (1), which is connected to a water tank (9) through a dual-inlet switching valve (10) and provides flowing water. The multi-channel control water pump (1) is connected to a circular cross-section ring pipe (2). The circular cross-section ring pipe (2) is equipped with a flow equalization plate (4), a water flow velocity probe (5), a dynamic water coupling test unit (6), a drain valve (7), and a filter screen (8).

2. The dynamic water disintegration device for solidified soil according to claim 1, characterized in that, The hydrodynamic coupling test unit (6) is equipped with a fixed screw hole (4.1), a control panel (4.2), a rotating lifting rod (4.3), a sample chamber (4.4), and an internal weighing device; the rotating lifting rod (4.3) can extend and retract in the vertical direction and rotate in the horizontal direction; the control panel (4.2) is used to control the extension length and horizontal rotation speed of the rotating lifting rod (4.3), and the weight of the sample chamber (4.4) can be displayed on the screen of the control panel (4.2).

3. The dynamic water disintegration device for solidified soil according to claim 1, characterized in that, The multi-channel control water pump (1) is equipped with a control panel (1.1) and multiple outlets (1.2). The flow rate of each outlet is controlled separately by the control panel (1.1). At the same time, the flow rate detected by the water flow velocity probe (5) in the pipeline will be displayed in the control panel (1.1) of the multi-channel control water pump (1).

4. The dynamic water disintegration device for solidified soil according to claim 1, characterized in that: The flow equalization plate (4) has regular holes (3.1) to make the water flow velocity distribution in the pipe cross section uniform.

5. A dynamic water disintegration device for solidified soil according to claim 1, characterized in that: The dual-inlet switching valve (10) is equipped with a switching valve (10.1). By rotating the switching valve (10.1), the water flow is set from the external water source inlet (10.3) or the internal circulation inlet (10.4) to the outlet (10.2).

6. The dynamic water disintegration device for solidified soil according to claim 1, characterized in that: The circular cross-section ring pipe (2) has a channel at the dynamic water coupling test unit (6) so that the dynamic water coupling test unit (6) can be taken out and placed. The circular cross-section ring pipe (2) is provided with a pipe stabilizing support (3) on the outside.

7. The test method for the dynamic water disintegration device for solidified soil according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Connect the water tank (9), the dual-inlet switching valve (10), the multi-way control water pump (1), and the circular cross-section ring pipe (2) in sequence; Step 2: Turn the switching valve (10.1) to turn on the multi-way control water pump (1) switch, adjust the water pump flow rate, so that the water flows from the external water source inlet (10.3) into and fills the entire circular cross-section ring pipe (2) and water tank (9), turn the switching valve (10.1) again, the external water source inlet (10.3) is closed, and the internal circulation inlet (10.4) is opened, so that the water flows in circulation inside the system; Step 3: Based on the data monitored by the water flow velocity probe (5), adjust the flow velocity of each water pump outlet (1.2) through the control panel (1.1) of the multi-channel sub-control water pump (1) until the data of the two water flow velocity probes (5) are the same or the difference is within a reasonable range; Step 4: [The following appears to be a separate, unrelated section:] The density is... The cylindrical sample is placed in the sample chamber (4.4) of the hydrodynamic coupling test unit (6). The hydrodynamic coupling test unit (6) is placed in the reserved channel position of the circular cross-section ring pipe (2). The fixing screw is inserted into the fixing screw hole (4.1) for fixing. The control panel (4.2) adjusts the extension length of the rotating lifting rod (4.3) and the horizontal rotation speed so that the sample chamber (4.4) is completely immersed in the water flow and rotates at a uniform speed in the water. Step 5: Input the water flow density in the control panel (4.2) of the hydrodynamic coupling test unit (6). and sample density Based on the buoyancy dynamic compensation algorithm, the underwater force value of the sample collected by the weighing device is converted into residual dry weight data in real time, and the residual dry mass-time change curve is generated on the control panel (4.2). The specific dynamic buoyancy compensation algorithm is as follows: The forces acting on the vertical interface of the sample when it is placed in the sample chamber in the water flow: ； Given: ； The dry weight of the sample is: ； in, This refers to the real-time measurement value output by the weighing device when the sample chamber contains the sample submerged in the water flow. The buoyancy of the liquid on the sample chamber without the sample. The buoyancy of the liquid on the sample is denoted as . The mass of the sample chamber excluding the sample. For the mass of the sample, The density of the liquid is the water flow. The density of the sample, This refers to the volume of the sample chamber excluding the sample. The volume of the sample is denoted by ; where the volume of the sample chamber does not include the volume of the sample. and quality It is fixed and known; Step 6: After the test, loosen the fixing screws, take out the hydrodynamic coupling test unit (6), open the drain valve (7), and collect the sample soil that has been washed away in the pipeline.

Images