Electroosmosis model test system for realizing multi-parameter monitoring

Abstract

The invention relates to the technical field of electro-osmosis reinforcement of soft clay, and discloses an electro-osmosis model test system for realizing multi-parameter monitoring, the electro-osmosis model test system comprises a bottom plate, a base and a mounting cylinder, the bottom plate is arranged below the base; a containing chamber is arranged at the top in the base, and a drainage collecting chamber is arranged at the bottom in the base; the bottom of the mounting cylinder is embedded in the containing chamber, a soil sample layer is contained in the mounting cylinder, an anode and a cathode are arranged on the upper side and the lower side of the soil sample layer respectively, a layer of porous stone and filter paper is arranged on one side, far away from the soil sample layer, of each of the anode and the cathode, a plurality of reserved holes are formed in the side wall of the mounting cylinder at intervals, and the reserved holes are communicated with the soil sample layer. And a potential probe is arranged at each preformed hole. The problems that a traditional electroosmosis model test system is single in monitoring parameter, low in precision, rough in structure and the like are solved, particularly, soil deformation can be monitored, and sufficient collection of pore liquid is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroosmosis reinforcement of weak clay, and in particular to an electroosmosis model test system for realizing multi-parameter monitoring. Background Art

[0002] In the field of electroosmosis reinforcement of weak clay, the traditional one-dimensional soil column model test system can simulate foundation electroosmosis, but its single function and limited monitoring parameters have the following significant drawbacks:

[0003] 1. Single monitoring parameter: Generally, only macroscopic electroosmotic phenomena, i.e. potential, current and electroosmotic drainage, can be observed;

[0004] 2. Soil deformation cannot be effectively monitored, resulting in large errors: The existing technology generally adopts the method of burying small settlement plates in the soil for monitoring. The error and dispersion of the monitoring data are large, and the movement of the small settlement plates will also cause disturbances to the test process, thereby further affecting the accuracy of the test results. This patent places organic glass pads in layers and combines them with a glass tube scale to directly observe the deformation of each soil layer. The method is simple, highly accurate, and has little disturbance to the soil layer.

[0005] 3. The ion migration process in electroosmosis cannot be observed: Generally, we can only conduct chemical ion testing on electroosmosis drainage, combined with chemical analysis of soil samples taken after the end of electroosmosis, to comprehensively infer the ion migration law in the electroosmosis process, but we cannot conduct direct and effective dynamic monitoring of the migration changes in the electroosmosis process.

[0006] The above-mentioned defects have seriously restricted the deepening of theoretical research and engineering application of electroosmosis technology. Therefore, there is an urgent need for an electroosmosis model test system that can realize multi-parameter integrated monitoring, structural optimization and strong anti-interference ability. Summary of the Invention

[0007] In order to solve the technical problems raised in the background technology, the present invention provides an electroosmosis model test system for realizing multi-parameter monitoring.

[0008] The present invention adopts the following technical solution to realize: an electroosmosis model test system for realizing multi-parameter monitoring, comprising a bottom plate, a base and a mounting tube, wherein:

[0009] The bottom plate is arranged below the base;

[0010] The top of the base is provided with a receiving chamber, and the bottom of the base is provided with a drainage collection chamber;

[0011] The bottom of the mounting cylinder is embedded in the receiving chamber, and a soil sample layer is received in the mounting cylinder. An anode and a cathode are respectively provided on the upper and lower sides of the soil sample layer. A layer of permeable stone and filter paper are provided on the side of the anode and cathode away from the soil sample layer. The main purpose is to filter and intercept soil particles adhering to the surface of the permeable stone and affecting water migration. A number of reserved holes are also provided at intervals on the side wall of the mounting cylinder, and a potential probe is installed at each reserved hole.

[0012] The soil sample layer is also pre-installed with a temperature and humidity sensor, and a cationic solution is also contained above the permeable stone at the top.

[0013] Preferably, the mounting tube is a transparent product, and a length scale is provided on the outer wall of the mounting tube.

[0014] Preferably, a water conduit connected to the drainage collection chamber is provided on the shell of the base, and the other end of the water conduit is connected to a beaker for collecting drainage and calculating the drainage rate.

[0015] Preferably, a plurality of organic glass pads are provided at different depths of the soil sample layer.

[0016] Preferably, a pore fluid collection box is also provided in the soil sample layer.

[0017] Preferably, the top cover of the pore liquid collection box is distributed with several water-permeable holes, and the two opposite side plates of the pore liquid collection box are respectively provided with gas phase holes and liquid phase holes, wherein the gas phase holes are connected to an external negative pressure pump, and the liquid phase holes are connected to an external collection bottle.

[0018] Preferably, the height of the gas phase pores is higher than that of the liquid phase pores.

[0019] Preferably, the distance between the axial centers of adjacent water-permeable holes in the same row is 3.25 mm, and the water-permeable holes in two adjacent rows are staggered.

[0020] Preferably, the anode and cathode are both EKG electrodes, and the cathode electrode plate and the anode electrode plate are both punched to ensure smooth electroosmotic drainage.

[0021] Preferably, the inner end of the drain pipe is open, and inner locking parts and outer locking parts are installed on the outside of the drain pipe on both sides of the pore fluid collection box shell. The inner locking parts and outer locking parts are hexagonal nuts and are spirally installed on the outer wall of the drain pipe.

[0022] Preferably, the inner end of the drain pipe is sealed, and a hole is provided at the bottom of the pipe wall. A water suction head is movably arranged in the hole, and an absorption hole is provided in the water suction head. A water suction port connected to the absorption hole is provided at the bottom end of the water suction head. A positioning groove is provided on the top surface of the water suction head. The bottom end of the water suction head also has an annular flange, and the outer wall of the drain pipe is correspondingly provided with a groove that can be magnetically attracted to the flange. When the flange is magnetically attracted to the groove, the bottom end of the water suction head is located inside the groove. A power unit is also installed on the drain pipe to drive the water suction head to move along the hole.

[0023] Preferably, the power unit includes a pressure column, a second hole is opened at the top of the drain pipe, and the pressure column can be movably passed through the second hole, a shift plate is fixed to the outer end of the pressure column, and a plurality of strip plates are extended along the axial direction of the inner end of the pressure column, and the bottom end of each strip plate is located in the positioning groove.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Multi-parameter integrated monitoring: Through the coordinated design of potential probes, temperature and humidity sensors, pore fluid collection boxes, and organic glass pads, the potential gradient, current distribution, soil moisture content, temperature, drainage rate, ion concentration, pH value, and stratified deformation can be monitored simultaneously, fully revealing the electrical-hydraulic-mechanical-chemical coupling mechanism in the electroosmosis process.

[0026] 2. High-precision real-time data acquisition; potential probes are arranged at intervals of 50 mm, and combined with temperature and humidity sensors buried in layers (one layer every 50 mm), this enables refined dynamic monitoring of soil internal parameters; the scale on the outer wall of the transparent mounting tube is combined with the organic glass pad to accurately quantify soil deformation, with the error controlled to the millimeter level.

[0027] 3. Structural optimization and functional enhancement: The water pipe is connected to the beaker and equipped with a cathode perforation design to ensure smooth drainage and a calculable rate. The pore fluid collection box adopts a split gas / liquid hole design (5mm aperture, staggered water-permeable holes), combined with a negative pressure pump and collection bottle to achieve efficient pore fluid separation and pollution-free sampling.

[0028] 4. Anti-interference and long-life design; EKG electrodes are used instead of metal electrodes to eliminate chemical corrosion and metal ion pollution, and improve the stability of the test environment;.

[0029] 5. Convenient and visual operation; the transparent mounting tube and outer wall scale support visual observation of the test process, which is convenient for recording soil settlement and crack development; the sensor and probe wires are led out through the reserved holes, and the interface is sealed, taking into account the convenience of data collection and the sealing of the system.

[0030] In summary, the present invention solves the problems of single monitoring parameters, low precision, and rough structure of traditional electroosmosis model test systems, and provides a highly reliable test platform for theoretical research and engineering optimization of electroosmosis reinforcement technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of the electroosmosis model test system for multi-parameter monitoring proposed by the present invention;

[0032] Figure 2 A front sectional view and a cross sectional view of the pore fluid collection box proposed by the present invention;

[0033] Figure 3 This is a diagram showing the installation effect of the pore fluid collection box proposed in the present invention during actual use;

[0034] Figure 4 Schematic diagram of the installation structure of the pore fluid collection box and the drainage pipe in Example 1 of the present invention;

[0035] Figure 5 Schematic diagram of the installation structure of the pore fluid collection box and the drainage pipe in Example 2 of the present invention;

[0036] Figure 6 For the present invention Figure 5 A magnified view of point A;

[0037] Figure 7 This is a three-dimensional diagram of the power unit and the water suction head in Example 2 of the present invention;

[0038] Figure 8 This is a three-dimensional diagram of the power unit and the water suction head in Example 2 of the present invention when viewed from another perspective.

[0039] Description of main symbols:

[0040] Bottom plate 1, base 2, mounting tube 3, pore liquid collecting box 4, liquid phase hole 401, gas phase hole 402, water permeable hole 403, cationic solution 5, permeable stone 6, anode 7, reserved hole 8, cathode 9, potential probe 10, water conduit 11, drainage collection chamber 12, receiving chamber 13, temperature and humidity sensor 14, organic glass pad 15, drain pipe 16, auxiliary water absorption mechanism 17, dial plate 18, pressure column 19, strip plate 21, groove 22, flange 23, water suction port 24, inner locking piece 25, outer locking piece 26, water suction head 27, absorption hole 2701, positioning sink 2702. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] Example 1:

[0043] Reference Figures 1-4 The present invention proposes an electroosmosis model test system for realizing multi-parameter monitoring, comprising a bottom plate 1, a base 2 and a mounting tube 3, wherein:

[0044] The bottom plate 1 is arranged below the base 2;

[0045] The top of the base 2 is provided with a receiving chamber 13, and the bottom of the base 2 is provided with a drainage collection chamber 12;

[0046] The bottom of the mounting tube 3 is embedded in the receiving chamber 13, and a soil sample layer is accommodated in the mounting tube 3. An anode 7 and a cathode 9 are respectively provided on the upper and lower sides of the soil sample layer. A layer of permeable stone 6 and filter paper are provided on the side of the anode 7 and the cathode 9 away from the soil sample layer. The main purpose of providing the permeable stone and the filter paper 6 is to filter and intercept soil particles adhering to the surface of the permeable stone and affecting water migration. A number of reserved holes 8 are also provided at intervals on the side wall of the mounting tube 3, and a potential probe 10 is installed at each reserved hole 8.

[0047] The soil sample layer is also pre-installed with a temperature and humidity sensor 14, and a cationic solution 5 is also contained above the permeable stone at the top.

[0048] As an optional embodiment of the present invention, the mounting tube 3 is a transparent product, and the outer wall of the mounting tube 3 is provided with a length scale.

[0049] As an optional embodiment of the present invention, a water conduit 11 connected to the drainage collection chamber 12 is provided on the shell of the base 2, and the other end of the water conduit 11 is connected to a beaker for collecting drainage and calculating the drainage rate.

[0050] As an optional embodiment of the present invention, a plurality of organic glass blocks 15 are provided at different depths of the soil sample layer, and the thickness of the organic glass blocks 15 is 5 mm.

[0051] As an optional embodiment of the present invention, a pore fluid collection box 4 is further provided in the soil sample layer. The pore fluid collection box 4 is a box-shaped structure of 50 mm×50 mm×20 mm.

[0052] The top cover of the pore liquid collection box 4 is distributed with several water-permeable holes 403, and the two opposite side plates of the pore liquid collection box 4 are respectively provided with gas phase holes 401 and liquid phase holes 402, wherein the pore liquid collection box 4 is a square box-shaped structure, the gas phase hole 401 is connected to the external negative pressure pump, and the liquid phase hole 402 is connected to the external collection bottle through the drain pipe 16 passing through the liquid phase hole 402, and the drain pipe 16 is located on the outside of the pore liquid collection box 4 shell. Internal locking parts 25 and external locking parts 26 are installed. In this solution, the internal locking parts 25 and the external locking parts 26 can be selected from hexagonal nuts, which are spirally installed on the outer wall of the drain pipe 16.

[0053] As an optional embodiment of the present invention, the diameters of the gas phase hole 402 and the liquid phase hole 401 are 5 mm, and the height of the gas phase hole 401 is higher than that of the liquid phase hole 402 .

[0054] As an optional embodiment of the present invention, the diameter of the water holes 403 is 2 mm, and the distance between the axes of adjacent water holes in the same row is 3.25 mm, and the water holes 403 in two adjacent rows are staggered.

[0055] As an optional embodiment of the present invention, the anode 7 and the cathode 9 are both EKG electrodes, and the electrode plate of the cathode 9 is punched to ensure smooth electroosmotic drainage.

[0056] As an optional embodiment of the present invention, the potential probes 10 are arranged at intervals of 50 mm, and the topmost and bottommost potential probes 10 are placed 5 mm away from the anode 7 and cathode 9 for calculating the potential loss and interface resistance at the electrode interface.

[0057] During operation, the potential probe 10, the temperature and humidity sensor 14 conductors, and the pore fluid collection box 4 pipes are all drawn out from the reserved holes 8 on both sides. The corresponding holes are sealed before the test begins. The temperature and humidity sensors 14 are buried in the corresponding layers at intervals of 50 mm to monitor soil moisture content. The electrodes used in the electroosmosis test are EKG electrodes, which can effectively avoid chemical corrosion and other problems caused by the use of metal electrodes. They can also eliminate the impact of metal cations produced by the electrode reaction on the test analysis. The cathode 9 electrode plate is perforated to ensure smooth electroosmotic drainage. The drainage collection chamber 12 is connected to an external beaker via a reserved water conduit 11 for collecting drainage and calculating drainage rate. During the test, potential probes 10 are inserted into the reserved holes 8 on both sides at intervals of 50 mm to monitor the potential and current of the corresponding soil layer.

[0058] Example 2:

[0059] Reference Figure 5-Figure 8In Example 1, the inner locking member 25 and the outer locking member 26 are sleeved on the outside of the drain pipe 16, which causes the bottom of the inner end of the drain pipe 16 to be unable to be flush with the bottom surface of the pore fluid collection box 4, thereby making it impossible to completely extract the water therein. Therefore, the difference between this embodiment and Example 1 is as follows:

[0060] In this embodiment, the inner end of the drain pipe 16 is sealed, and a hole is opened at the bottom of the pipe wall. A water suction head 27 is movably installed in the hole, and an absorption hole 2701 is set in the water suction head 27. Figure 6 The bottom end of the water suction head 27 is provided with a water suction port 24 connected to the absorption hole 2701, and the top surface of the water suction head 27 is provided with a positioning sink 2702, and the bottom surface of the water suction head 27 can contact the inner bottom surface of the pore liquid collection box 4, and the bottom end of the water suction head 27 is also provided with an annular flange 23. The outer wall of the drain pipe 16 is correspondingly provided with a groove 22 that can be magnetically attracted to the flange 23. When the flange 23 is magnetically attracted to the groove 22, the bottom end of the water suction head 27 is located inside the groove 22, which will not affect the insertion of the drain pipe 16 into the corresponding liquid phase hole 402, and the installation is more convenient and quick.

[0061] In order to cooperate with the water suction head 27, a second hole is opened at the top of the drain pipe 16, and a pressure column 19 can be movably penetrated at the second hole. A paddle 18 is fixed to the outer end of the pressure column 19 to facilitate the insertion and removal of the pressure column 19. The inner end of the pressure column 19 has several strip plates 21 extending along its axial direction, and the bottom end of each strip plate 21 is located in the positioning groove 2702. When in use, first insert the pressure column 19 into the second hole, press the paddle 18 to use the strip plate 21 to push the water suction head 27 downward, and until the bottom surface of the water suction head 27 contacts the inner bottom surface of the pore liquid collection box 4, the water pump can work to effectively discharge the pore liquid collected in the pore liquid collection box 4 completely.

[0062] The relevant parameters are measured as follows:

[0063] Electroosmosis parameters: A DC voltage- and current-stabilized power supply was used as the electroosmosis power source. High-precision voltmeters and ammeters were used to monitor the potential and current at the interface between the soil layer and the electrode in real time. The data were recorded in real time on a computer for calculation and analysis of soil conductivity. Furthermore, drainage volume in the drainage chamber was collected every two hours, and the drainage rate was calculated.

[0064] Soil deformation and moisture content: Deformation was observed using organic glass blocks 15 embedded in the corresponding soil layers, with soil layers spaced 50 mm apart. When the soil deformed, the glass blocks moved with it. The magnitude of this movement, measured using a scale on the outer wall of the test apparatus, represented the soil deformation. Moisture content was monitored in real time using temperature and humidity sensors 14 embedded in the corresponding layers and recorded in a computer.

[0065] Ion concentration and pH value detection: By collecting electroosmotic drainage and extracting pore solution, the pH value and ion concentration in the solution are tested using a plasma emission spectrometer to analyze the electrical migration behavior and change patterns of ions during the electroosmosis process.

[0066] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An electroosmosis model test system for realizing multi-parameter monitoring, characterized in that: It includes a base plate, a base and a mounting tube, wherein: The bottom plate is arranged below the base; The top of the base is provided with a receiving chamber, and the bottom of the base is provided with a drainage collection chamber; The bottom of the mounting tube is embedded in the receiving chamber, and a soil sample layer is received in the mounting tube. An anode and a cathode are respectively provided on the upper and lower sides of the soil sample layer. A layer of permeable stone and filter paper are provided on the side of the anode and cathode away from the soil sample layer. A plurality of reserved holes are also provided at intervals on the side wall of the mounting tube, and a potential probe is installed at each reserved hole. The soil sample layer is also pre-installed with a temperature and humidity sensor, and a cationic solution is also contained above the permeable stone at the top.

2. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The installation tube is a transparent product, and a length scale is provided on the outer wall of the installation tube.

3. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: A water conduit connected to the drainage collection chamber is provided on the shell of the base, and the other end of the water conduit is connected to a beaker for collecting drainage and calculating the drainage rate.

4. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: A plurality of organic glass pads are arranged at different depths in the soil sample layer, and a pore fluid collection box is also arranged in the soil sample layer.

5. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The top cover of the pore liquid collection box is distributed with several water-permeable holes, and the two opposite side plates of the pore liquid collection box are respectively provided with gas phase holes and liquid phase holes. The gas phase hole is connected to an external negative pressure pump and is connected to an external collection bottle through a drainage pipe 16 passing through the liquid phase hole.

6. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: And the height of the gas phase hole is higher than that of the liquid phase hole.

7. The electroosmosis model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The anode and cathode are both inert electrodes, and the cathode electrode plate and the anode electrode plate are both perforated to ensure smooth electroosmosis drainage.

8. The electroosmosis model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The inner end of the drain pipe is open, and inner and outer locking parts are installed on the outside of the drain pipe on both sides of the pore fluid collection box 4 shell. The inner and outer locking parts are hexagonal nuts and are spirally installed with the outer wall of the drain pipe.

9. The electroosmotic model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The inner end of the drainage pipe is sealed, and a hole is provided at the bottom of the pipe wall. A water suction head is movably arranged in the hole, and an absorption hole is provided in the water suction head. A water suction port connected to the absorption hole is provided at the bottom end of the water suction head. A positioning groove is provided on the top surface of the water suction head. The bottom end of the water suction head also has an annular flange, and the outer wall of the drainage pipe is correspondingly provided with a groove that can be magnetically attracted to the flange. When the flange is magnetically attracted to the groove, the bottom end of the water suction head is located inside the groove. A power unit is also installed on the drainage pipe to drive the water suction head to move along the hole.

10. The electroosmosis model test system for realizing multi-parameter monitoring according to claim 1, characterized in that: The power unit includes a pressure column, a second hole is opened at the top of the drain pipe, and the pressure column can be movably passed through the second hole. A dial plate is fixed to the outer end of the pressure column, and a number of strip plates extend axially from the inner end of the pressure column, and the bottom end of each strip plate is located in the positioning groove.

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