CN112611683B - Device for monitoring solute transport with adjustable gap width - Google Patents
Device for monitoring solute transport with adjustable gap width Download PDFInfo
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- CN112611683B CN112611683B CN202011574398.1A CN202011574398A CN112611683B CN 112611683 B CN112611683 B CN 112611683B CN 202011574398 A CN202011574398 A CN 202011574398A CN 112611683 B CN112611683 B CN 112611683B
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- 238000012544 monitoring process Methods 0.000 title claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 279
- 238000007789 sealing Methods 0.000 claims abstract description 100
- 238000012806 monitoring device Methods 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 35
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 24
- 229910052697 platinum Inorganic materials 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims 5
- 238000007906 compression Methods 0.000 claims 5
- 238000012360 testing method Methods 0.000 abstract description 23
- 238000013461 design Methods 0.000 abstract description 2
- 238000013508 migration Methods 0.000 description 30
- 230000005012 migration Effects 0.000 description 30
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 20
- 238000000034 method Methods 0.000 description 19
- 230000008859 change Effects 0.000 description 14
- 230000008569 process Effects 0.000 description 10
- 239000011780 sodium chloride Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009375 geological disposal Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003938 response to stress Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention discloses a monitoring device capable of adjusting crack gap width for solute transport, which comprises a water supply device positioned at a high water level, a crack device and a drainage device positioned at a low water level; the crack device comprises a bottom plate, a fixed crack plate fixed on the bottom plate, a sealing plate, an upper adjusting crack plate, an adjusting screw rod for adjusting the width of the crack, a pressing device and a detecting sheet for detecting the characteristics of solute; the adjusting screw penetrates through the fixed slit plate and the bottom plate, an adjusting end is arranged at the outer leakage end of the bottom, the upper end of the adjusting screw is supported at the bottom of the adjusting slit plate, so that the adjusting slit plate is arranged at the upper part of the fixed slit plate at intervals, the temperature, the conductivity and the stress value of a water flow test and a solute transport test can be monitored in real time, the measured values are instantaneous values, and meanwhile, the measured data accuracy is corrected by combining the measured temperature value and the conductivity value of the drainage device, and the adjusting screw is reasonable in design and has wider popularization value.
Description
Technical Field
The invention belongs to the technical field of hydrogeology, and particularly relates to a monitoring device capable of adjusting crack gap width for solute transport.
Background
Current large-scale ergonomic activities such as coal mining, tunnel excavation, nuclear waste geological disposal, and CO 2 Geological sequestration, shale gas development, etc. have serious impact on bedrock groundwater environments and can lead to catastrophic results. And fractured rock mass has typical heterogeneity and multiscale, groundwater often presents non-Darcy flow and non-Fickian migration, and quantifying water flow and solute migration in such media is one of the challenging challenges faced by the hydrogeological community.
Conventionally, fracture solute transport characteristics are mainly disclosed by utilizing sampling, but the solute in the fracture is easily disturbed in the sampling process, and the solute transport process is destroyed, so that the fracture water flow and the solute transport cannot be accurately evaluated. Therefore, the method is suitable for developing the monitoring equipment device for the crack solute migration process, and a rapid and nondestructive monitoring method for acquiring the solute migration is provided for developing the crack water of the bedrock and the research on the solute migration mechanism and the model.
Disclosure of Invention
Aiming at the defects and problems of the existing equipment, the invention provides a monitoring device capable of adjusting the crack width of the solute transport, which effectively solves the problems of inconvenient crack width adjustment, single function, poor reality of solute flow in simulated cracks and limited simulated crack range of the existing equipment.
The invention solves the technical problems by adopting the scheme that: a monitoring device capable of adjusting crack gap width for solute transport comprises a water supply device positioned at a high water level, a crack device and a water discharge device positioned at a low water level; the crack device comprises a bottom plate, a fixed crack plate fixed on the bottom plate, a sealing plate, an upper adjusting crack plate, an adjusting screw rod for adjusting the width of the crack, a pressing device and a sensor for monitoring solute transport; the adjusting screw rod penetrates through the fixed slit plate and the bottom plate, an adjusting end head is arranged at the outer leakage end of the bottom, the upper end of the adjusting screw rod is supported at the bottom of the adjusting slit plate, and the adjusting slit plate is arranged at the upper part of the fixed slit plate at intervals, so that a slit is formed between the adjusting slit plate and the fixed slit plate; a fixed sealing layer and an adjustable sealing layer are respectively and correspondingly arranged between the inner sides of the sealing plates at two sides and the sealing of the fixed slit plate and the adjusting slit plate, so that the two sides of the slit are sealed, the two ends of the slit are open, a water supply tank communicated with a water supply device is arranged at the water supply end of the slit, a water drainage tank communicated with a water drainage device is arranged at the water outlet end of the slit, and solute adding ports and sampling ports communicated with the slit are respectively arranged at the upper side surfaces of the front end and the rear end of the adjusting slit plate; the compressing device comprises a transverse plate, a supporting frame and a compressing screw, wherein the transverse plate stretches across the upper part of the adjusting slit plate, the supporting frame is fixed on the bottom plate, the compressing screw is vertically arranged on the transverse plate, two sides of the transverse plate are fixed on the supporting frame, the compressing screw is in threaded connection with the transverse plate, the bottom of the compressing screw is in pressing contact with the adjusting slit plate through a compressing block, a monitoring caulking groove is formed in the fixing slit plate, and the sensor is hermetically adjusted in the monitoring caulking groove and is flush with the surface of the fixing slit plate.
Further, the width of fixed slit plate be wider than adjusting slit plate, the downside of closing plate is provided with the seal groove, fixed sealing layer sets up in the seal groove, the both sides suit of fixed slit plate is in the seal groove, the bottom of closing plate passes through connecting bolt to be fixed in the both sides of fixed slit plate, connecting bolt runs through fixed sealing layer.
Further, the fixed sealing layer and the adjustable sealing layer are of an integrated structure, the upper part and the lower part of the adjustable sealing layer are both fixed on the sealing plate, the back of the middle part of the adjustable sealing layer is a deformation area, the back of the deformation area is provided with a sealing bolt, the bottom of the sealing bolt is provided with a continuous adjusting lath, the adjusting lath is propped against the back of the deformation area, and the deformation area is propped against the side face of the adjustable slit plate.
Further, the sensor comprises a temperature sensor a used for monitoring the temperature of the solution in the slit device, a stress plate b used for monitoring the stress of the solution in the slit device and an electrode platinum plate c used for monitoring the conductivity value of the solution in the slit device, wherein the temperature sensor a, the stress plate b and the electrode platinum plate c are uniformly distributed on a fixed slit plate in an array manner, and each row and each column of intersection point of the array contains the temperature sensor a, the stress plate b and the electrode platinum plate c; the side surface of the sealing plate is penetrated with an electrode d for monitoring the resistivity, and the inner end of the electrode d penetrates into the crack for monitoring the solution resistivity in the crack device.
Further, the water supply tank comprises a water supply tank body, a steady flow plate, a diversion plate and a water drain valve, wherein the water supply tank body is fixed on the bottom plate and is in sealing connection with the front ends of the fixed fracture plate and the adjustable fracture plate, a water inlet communicated with a water supply pipe is formed in the upper portion of the water supply tank body, a water supply port is formed in the middle of a tank wall on the opposite side of the water inlet, the diversion plate is sleeved in the water supply port and is communicated with the front end of the fracture, array-shaped diversion holes are formed in the diversion plate, the water drain valve is arranged at the bottom of the water supply tank body, the steady flow plate is vertically arranged in the middle of the water supply tank body along the bottom of the steady flow plate, and gaps exist between the bottom of the steady flow plate and the tank bottom, so that the water supply tank body is divided into a steady flow area on the left side and a water supply area on the right side, and the bottom of the steady flow area is communicated with the water supply area.
Further, the water supply device comprises a lifting frame, a water supply tank, a water pump and an overflow plate; the water supply tank is fixed on the lifting frame, so that the water supply level of the water supply tank is adjustable, the overflow plate is vertically arranged in the water supply tank, the water supply tank is divided into a left overflow area and a water injection area, the bottom of the overflow area is communicated with the water tank through the water drain valve, the water tank is used for injecting water into the water injection area through the water pump, and the overflow area is communicated with the water supply tank through the pipeline.
Further, the drainage tank comprises a drainage tank body, a water drain valve at the bottom, a water inlet at the middle part and a water outlet at the upper part; the water inlet is formed in the middle of a side plate of the tank body and is communicated with a slit, the water outlet and the water drain valve are arranged on the opposite side of the water inlet, the water drain device comprises a water drain box, a lifting frame, a partition plate, a measuring cylinder and a water tank, the water drain box is arranged on the lifting frame, the partition plate divides the water drain box into a water drain area on the left side and an overflow area on the right side, a water drain valve is arranged at the bottom of the water drain area, an overflow pipe is arranged on the side face of the overflow area, and the overflow pipe is communicated with the measuring cylinder through a valve.
Further, a supporting frame is arranged at the bottom of the bottom plate, and a space for operating the adjusting screw and arranging the electric wires exists between the supporting frame and the bottom plate.
The invention has the beneficial effects that: the invention provides a high-water-level water supply device, a low-water-level water drainage device and a crack device positioned between water supply and water drainage, wherein a fixed crack plate, an adjusting crack plate and a sealing plate for sealing the sides of the two plates are arranged in the crack device, wherein the fixed crack plate is used as a bottom plate of a crack, the adjusting crack plate can be supported by adjusting screws, the adjusting screws can be provided with 4 or more adjusting crack plates, the height of the crack can be adjusted, the crack width of the crack can be adjusted, the adjusting crack plate is tightly pressed on the adjusting screws through a pressing device, in order to avoid abrasion of the adjusting screw on the adjusting crack plate, a hard block corresponding to the adjusting screw is arranged at the bottom of the adjusting crack plate, the hard block is nested in the adjusting crack plate and is flush with the bottom of the adjusting crack plate, and the hard block is replaceable, so that the service life of the adjusting crack plate is prolonged.
In order to simulate the flow of the solute, the water flow of the water supply is taken as a carrier, a solute adding port is formed in the upper part of the adjusting slit plate, the solute can be sodium chloride solution and is used for simulating the solute (pollutant), and the characteristics of the solute during migration, such as temperature, stress and conductivity value, are monitored through a sensor at the bottom. The resistivity at the time of solute transport was monitored by the resistivity of the side.
In addition, the adjusting sleeves are arranged on two sides of the adjusting slit plate, the outer sides of the adjusting sleeves are in arc-shaped structures, the arc-shaped structures can allow the adjusting slit plate to be obliquely propped against the sealing plate, and good sealing conditions can still be realized under the oblique state, so that the adjusting sleeve is suitable for the situation that the slit widths of the slits are the same, is also suitable for the situation that the upper side faces are oblique, and increases the simulation range of the slits.
According to the invention, the fixed sealing layer and the adjustable sealing layer are of an integrated structure, wherein the fixed sealing layer is nested in the sealing groove, the sealing groove is arranged to enable the fixed slit plate to extend into the sealing plate, meanwhile, the sealing plate is located on the fixed slit plate, the sealing degree of the bottom is improved, and a deformation area is arranged in the middle of the adjustable sealing layer, and can be abutted against the outer side face of the adjustable slit plate by the adjusting lath on the back, so that the sealing strength is stronger, the structure of the adjustable slit plate can be stably adjusted, and the sealing degree of the fixed slit plate and the adjustable slit plate is greatly improved.
In addition, the height-adjustable water supply device and the height-adjustable water discharge device are arranged in the invention, so that the water level difference of water supply, water discharge and cracks can be adjusted, further, the solute flowing condition with different height differences can be simulated, and the simulative range is improved.
Therefore, the invention is especially suitable for monitoring the crack water and solute migration process, can accurately, quantitatively and rapidly monitor the crack water and solute migration distribution condition, provides powerful data support for the quantification of crack solutes and pollutants, realizes the real-time monitoring of water flow and solute migration multisource data, comprises temperature values, conductivity values, resistivity values and stress values in water flow tests and solution solute migration tests, can monitor the temperature, conductivity and stress values of the water flow tests and the solute migration tests in real time, and has the advantages that the measured values are instantaneous values, porous media with different particle diameters can be filled in the crack width, and the porous media can also be water.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic structural view of a slit device.
FIG. 3 is a schematic view of another configuration of a slit apparatus.
Fig. 4 is a schematic view of a structure of a water supply tank.
Fig. 5 is a schematic view of a water supply apparatus.
Fig. 6 is a schematic structural view of the splitter plate.
Fig. 7 is a schematic structural view of the drain tank.
Fig. 8 is a schematic structural view of the drainage device.
Fig. 9 is a schematic diagram of the arrangement of the sensor.
The reference numerals in the figures are: 1 is a water supply device, 11 is a water supply tank, 12 is an overflow plate, 13 is a water tank, 14 is a water pump, 15 is a water drain valve, and 16 is a lifting frame; 2 is a water supply tank, 21 is a water supply tank body, 22 is a steady flow plate, 23 is a water inlet, 24 is a water drain valve, 25 is a flow dividing plate; 3 is a slit device, 31 is a bottom plate, 32 is a fixed slit plate, 33 is an adjusting slit plate, 34 is a sealing plate, 35 is a fixed sealing layer, 36 is an adjustable sealing layer, 37 is an adjusting screw, 38 is a pressing device, 381 is a supporting frame, 382 is a rotating wheel, 383 is a transverse plate, 384 is a pressing screw, 385 is a limiting plate; 39 is a fixing frame; 301 is a connecting bolt, 302 is a connecting block, 303 is an adjusting sleeve, 304 is a spring, 305 is a sealing bolt, 306 is a solute injection port, 307 is a sampling port; 4 is a drainage tank, 41 is a drainage tank body, 42 is a water inlet, 43 is a drainage pipe, 44 is a water drain valve, and 45 is a drainage plate; 5 is a drainage device, 51 is a drainage box, 52 is an overflow plate, 53 is a measuring cylinder, 54 is a drainage valve, 55 is a water tank, and 56 is a lifting frame.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1: the embodiment aims to provide a monitoring device for solute migration with adjustable gap width, which mainly relates to a monitoring device for solute migration with adjustable gap width, is particularly suitable for monitoring the solute and pollutant migration process of the gap water, and aims to solve the problems of limited simulation range and poor tightness of the gap width existing in the existing structure.
As shown in fig. 1, a monitoring device for solute transport with adjustable gap width comprises a water supply device 1 positioned at a high water level, a gap device 3 and a water discharge device 5 positioned at a low water level; the slit device 3 is positioned between the water supply device 1 and the water discharge device 5, a water supply tank 2 and a water discharge tank 4 which are correspondingly connected with the water supply device 1 and the water discharge device 5 are arranged on two sides of the slit device, and water flow in the slit seam is realized by utilizing the water level difference of the water supply device 1 and the water discharge device 5.
As shown in fig. 2, the slit device comprises a bottom plate 31, a fixed slit plate 32 fixed on the bottom plate 31, a sealing plate 34, an upper adjusting slit plate 33, an adjusting screw 37 for adjusting the width of the slit, a compacting device 38 and a sensor for monitoring the characteristics of the solute; the fixed slit plate 32 is an acrylic plate with the thickness of 30mm, the adjusting slit plate 33 is an acrylic plate with the thickness of 50mm, the sealing plate 34 is an acrylic plate with the thickness of 30mm, and the adjusting slit plate is a replaceable slit surface with different roughness.
The specific adjusting screw rod is arranged in the following way: the adjusting screw 37 penetrates the fixed slit plate 32 and the bottom plate 31 and is provided with an adjusting tip at the outer leakage end of the bottom, the upper end of the adjusting screw is supported at the bottom of the adjusting slit plate 33, the adjusting slit plate is arranged at the upper part of the fixed slit plate 32 at intervals, so that a slit is formed between the adjusting slit plate 33 and the fixed slit plate 32, and the slit has the dimensions of length (1000 mm) x width (500 mm) x height (2 mm); according to experimental conditions, the width of the crack is adjusted through four adjusting screws, and the crack surface can be replaced by crack panels with different roughness.
In this embodiment, a fixing frame 39 is further disposed at the bottom of the bottom plate 31, and a space for operating the adjusting screw and arranging the electric wires is provided between the fixing frame 39 and the bottom plate 31, and the adjusting head is located in the space, so that an operator can adjust the relative height of the adjusting slit plate from the bottom, and meanwhile, a transmission line connected with the sensor extends out of the space.
In addition, a fixed sealing layer 35 and an adjustable sealing layer 36 are correspondingly arranged between the inner sides of the sealing plates 34 positioned at two sides and the sealing of the fixed slit plate 32 and the adjustable slit plate 33 respectively, so that two sides of the slit are sealed and two ends of the slit are opened, a water supply end of the slit is provided with a water supply tank 2 communicated with a water supply device, a water outlet end of the slit is provided with a water discharge tank 4 communicated with a water discharge device, the water level of the water supply device 1 is higher than that of the slit and the water discharge device 5, and the water discharge device 5 is positioned at the upper part of the slit, so that water can be filled in the slit and can flow in the slit by utilizing the water level difference existing between the water discharge device and the water supply device.
A solute adding port 306 communicated with the slit is arranged on the upper side surface of the front end of the adjusting slit plate 33; the upper part of the rear end of the adjusting slit plate 33 is provided with a sampling port 307 communicated with the slit, the solute is injected through the solute adding port, the solute adding port is positioned at the center line, the distance from the solute adding port to the water supply tank is 10mm, the solution distribution condition below the solute adding port with the adding port as the center can be simulated, the sampling port is positioned at the center line and the distance from the water draining tank is 10mm, and therefore the appointed area of the lower part of the slit can be sampled through the sampling port.
The pressing device 38 in this embodiment includes a transverse plate 383 that spans over the upper portion of the adjustment slit plate, a supporting frame 381 fixed on the bottom plate 31, and a pressing screw 384 vertically disposed on the transverse plate 383, where two sides of the transverse plate 383 are fixed on the supporting frame 381, and the pressing screw 384 is screwed on the transverse plate 383, and the bottom of the pressing screw 384 is pressed against the adjustment slit plate 33 through a pressing block, so that the adjustment pressing screw 384 can press against the adjustment slit plate from the upper portion thereof, and is matched with the adjustment screw to fix the position of the adjustment slit plate.
The fixed slit plate 32 is provided with a sensor caulking groove, the sensor is sealed and adjusted in the sensor caulking groove and is flush with the surface of the fixed slit plate, as shown in fig. 9, the sensor in the embodiment comprises a temperature sensor a for monitoring the temperature of the slit solution, a stress plate b for monitoring the stress of the slit solution and an electrode platinum plate c for monitoring the conductivity value of the slit solution, the array of the temperature sensor a, the stress plate b and the electrode platinum plate c is distributed on the fixed slit plate, and the intersection points of each row and each column of the array comprise the temperature sensor a, the stress plate b and the electrode platinum plate c; an electrode d for monitoring the resistivity of the fracture solution penetrates through the side face of the sealing plate, and the inner end of the electrode d penetrates into the fracture, so that a temperature monitoring system, a stress monitoring system, a conductivity monitoring system and a high-density resistivity monitoring system are formed in the fracture.
The temperature monitoring system comprises a temperature sensor a, a data acquisition unit and a computer, wherein the temperature acquisition unit is a cabinet type grating regulator (N2S-FBG-A01 CD) and is connected with the computer through a transmission line.
The stress monitoring system comprises a stress piece b, a data acquisition unit and a computer; wherein the stress collector is a cabinet type grating regulator (N2S-FBG-A01 CD) and is connected with the computer through a transmission line.
The conductivity monitoring system comprises an electrode platinum sheet, a data acquisition unit and a computer, wherein the data acquisition unit is a multichannel industrial conductivity meter HT3000 produced by Wuhan; the conductivity acquisition instrument is connected with a computer through a transmission line; the temperature, stress and electric conduction transmission lines are used for connecting corresponding sensors with the collector through reserved holes of the fixed slit plate respectively, the sensors are arranged on the inner wall of the fixed slit plate, and the distance between every two adjacent sensors is 80mm.
The high-density resistivity monitoring system comprises an electrode d, a high-density electric method instrument and a computer, wherein the electrode is arranged on a reserved hole of a front side plate of a supporting plate around a fracture surface and is connected with the high-density electric method instrument through a data transmission line, the high-density electric method is connected with the computer through the transmission line, the electrode d adopts a 35mm long copper electrode, the electrode distance is 100mm, the copper electrode is a hollow electrode and can be used for sampling or testing a hydraulic gradient, the high-density electric method instrument is ERT21 developed by Nanjing university, the high-density electric method electrode is a hollow copper electrode, the copper electrode has good conductivity, the size of the copper electrode can be enlarged or reduced, the size of the copper electrode can be suitable for laboratory scale tests, the test site test can be met, the requirement of the high-density electric method on resistivity can be used as a solution taking hole in solute migration, the hydraulic gradient test hole can be used for testing a water flow test, and the purpose of one hole is achieved.
The invention realizes nondestructive monitoring of water flow and crack solute transport, the measured values are all balance original data in the crack device, realizes real-time monitoring of water flow and solute transport multisource data, can monitor the temperature, conductivity and stress values of water flow test and solute transport test in real time, the measured values are instantaneous values, and simultaneously, the measured values and conductivity values of the drain tank are combined to correct the accuracy of the measured data.
The operation steps of the embodiment in specific operation are as follows:
s1, assembling and testing: and assembling and connecting the fracture device, the adjusting screw, the injection, the drainage box, the injection and drainage groove and the monitoring system. And (3) opening the water supply tank, closing the water discharge tank, slowly flowing water into the slit device through the water injection tank until the whole slit device is completely filled with water, testing the tightness of the slit device, if water seepage exists, evacuating the water in the slit device, and sealing the water leakage position until the model is not leaked, thereby completing the sealing test of the device.
S2, water flow experiment: the gap width is adjusted to be 2mm (adjustable) through the adjusting screw, the roughness of the adjusting slit plate is 0.9 (adjustable), different water flow speed tests are realized through adjusting the height difference of the water supply tank and the water drainage tank, and the water flow speed quantification calculation is realized through the water flow quantity flowing out of the water drainage tank in unit time.
S3, solute migration experiment: under the conditions of different water flow speeds, different crack widths and different crack thicknesses, carrying out crack solute migration experiments; inert or reactive solution is injected through the solute adding hole, the solution is taken out from the solution sampling hole, the conductivity of the solution is monitored by using a DJS-1C conductivity meter of Shanghai Lei Ci company, and the solution solubility and penetration curve are calculated through a conductivity standard curve to determine the starting and ending time of solution solute migration.
S4, a multi-source data monitoring system: the temperature sensor, the stress sheet, the conductive platinum sheet and the electrode are arranged on the slit device, the temperature sensor and the conductive platinum sheet are arranged on the drainage tank for calibration reference, and the temperature, the stress, the conductivity and the electrode data change in the solute migration process are measured in real time by utilizing the multi-source data monitoring system.
The water flow motion equation and the electric field motion equation both accord with the Laplacian equation set, and the high-density electric method is used for monitoring the water flow motion to accord with objective rules. Meanwhile, pressure can be generated on the fracture surface under different flow rates of water flow in the fracture device, and the stress change of the water flow on the fracture surface under different flow rates can be observed through the stress change of the stress acquisition system.
Thus, this example analyzes the migration process of sodium chloride solution in the fracture device by the monitoring system until the solute has migrated out of the fracture body. The concentration change and the change along with the migration position of the sodium chloride solution in the fracture are monitored through the electrode conductivity value in the fracture main body, the high conductivity value indicates that the concentration of the solution is increased, the pollutant migrates to the point, the low conductivity value indicates that the concentration of the solution is reduced, the pollutant is far away from the point, and the solution and pollutant migration process in the whole fracture device is revealed through the monitoring of the change of the conductivity value of the solution at different positions at different times.
And monitoring the temperature change of the sodium chloride solution in the fracture body and the change of the sodium chloride solution along with the migration position of the sodium chloride solution according to the temperature of the temperature sensor in the fracture body. And monitoring the stress change of the sodium chloride solution in the fracture body and the migration position change of the sodium chloride solution along with the stress value change in the fracture body. And monitoring the resistivity change of the sodium chloride solution in the fracture body and the migration position change of the sodium chloride solution along with the change of the resistivity value of the side surface of the fracture body.
In summary, compared with the prior art, the embodiment has the following advantages: the water flow and solute migration tests with different crack widths can be regulated through the regulating screw; the invention can simulate water flow and solute migration tests with different crack roughness by replacing the crack surface, and has reasonable design and wider popularization value. By means of a multisource data acquisition system, crack solute migration tests are developed by changing different crack gap widths, crack roughness and water flow speeds, conductivity, temperature, resistivity and stress response rules in the solute migration process are observed, solute migration rules in the cracks under different crack gap widths, roughness and flow speeds are revealed, water flow movement and solute movement processes in different cracks are quantized, the mechanism is clarified, and a monitoring device with a wide simulation range is provided for the crack tests.
Example 2: this embodiment is substantially the same as embodiment 1, except that: this embodiment further describes the sealing structure.
The width of the fixed slit plate 32 is wider than that of the adjusting slit plate 33, a sealing groove is arranged at the lower side of the sealing plate 34, a fixed sealing layer is arranged in the sealing groove, two sides of the fixed slit plate 32 are sleeved in the sealing groove, the bottom of the sealing plate is fixed at two sides of the fixed slit plate 32 through connecting bolts 301, and the connecting bolts 301 penetrate through the fixed sealing layer 35; the fixed sealing layer 35 and the adjustable sealing layer 36 are of an integrated structure, the upper part and the lower part of the adjustable sealing layer 36 are both fixed on the sealing plate, the back of the middle part of the adjustable sealing layer is a deformation area, the back of the deformation area is provided with a sealing bolt 305, the bottom of the sealing bolt 305 is provided with a continuous adjusting lath, the adjusting lath is propped against the back of the deformation area, and the deformation area is propped against the side face of the adjustable slit plate.
In the embodiment, the structure of the fixed sealing layer and the adjustable sealing layer is fixed, the connection bolt 301 is used for realizing the connection between the sealing plate and the fixed slit plate and the sealing and fixed connection through the sealing layer, the sealing groove is arranged to enable the sealing plate to be located on the fixed slit plate, the connection structure of the sealing layer is further reinforced, the falling of the sealing layer is avoided, and the stability of the sealing layer is improved; the sealing bolts which can loosen and tightly prop up the reinforcement are arranged at the adjustable sealing layer, the sealing bolts are arranged at the back of the adjusting plate strip at intervals, the loosening enables the adjusting slit plate to be adjusted up and down, and the sealing plate strip can prop up the deformation area when being screwed up, so that sealing is formed at the outer side of the adjusting slit plate.
Meanwhile, in the embodiment, the support frame is connected to the outer side of the sealing plate through bolts, and the connecting block 302 is further arranged between the support frame and the sealing plate, so that the structure of the sealing plate is further stabilized.
Example 3: this embodiment is substantially the same as embodiment 1, except that: this embodiment further describes a water discharge and supply device.
The water supply device comprises a lifting frame 16, a water supply tank 11, a water tank 13, a water pump 14 and an overflow plate 12; the water supply tank 11 is fixed on the lifting frame 16, so that the water supply level of the water supply tank is adjustable, the overflow plate 12 is vertically arranged in the water supply tank, the water supply tank is divided into a left overflow area and a water injection area, the bottom of the overflow area is communicated with the water tank 13 through the water drain valve 15, the water tank is filled with water into the water injection area through a water pump, and the overflow area is communicated with the water supply tank through a pipeline.
The water supply tank comprises a water supply tank body 21, a flow stabilizing plate 22, a water diversion plate 25 and a water drain valve 24, wherein the water supply tank body 21 is fixed on a bottom plate and is connected with the front ends of the fixed slit plate and the adjustable slit plate in a sealing mode, a water inlet 23 communicated with a water supply pipe is formed in the upper portion of the water supply tank body 21, a water supply port is formed in the middle of a tank wall opposite to the water inlet 23, the water diversion plate 25 is sleeved in the water supply port and is communicated with the front end of the slit, arrayed water diversion holes are formed in the water diversion plate 25, water flows uniformly enter the slit, the water drain valve is arranged at the bottom of the water supply tank body 21, the flow stabilizing plate 22 is vertically arranged in the middle of the water supply tank body 21, a gap is reserved between the bottom of the flow stabilizing plate 22 and the tank bottom, accordingly the tank body is divided into a flow stabilizing area on the left side and a water supply area on the right side, the flow stabilizing area is communicated with the bottom of the water supply area, water flowing through the flow stabilizing plate is avoided, water flowing through the water supply tank is stabilized in an emergency mode, water supply is enabled, and a water supply is prevented from being disturbed by a slit model.
The drainage tank comprises a drainage tank body 41, a water drain valve at the bottom, a water inlet at the middle part and a water outlet at the upper part; the water inlet 42 is arranged in the middle of the side plate of the drainage groove body 41, the water inlet 42 is communicated with the slot, the drainage plate 45 is sleeved in the water inlet 42, a plurality of drainage holes which are uniformly distributed at intervals are arranged at the bottom of the drainage plate 45, the slot is communicated with the drainage groove through the drainage holes, the drainage pipe 43 and the drainage valve 44 are arranged on the opposite side of the water inlet, in the embodiment, the drainage valve 44 is used for completely draining water in the drainage groove, the drainage pipe is used for continuously supplying water to the drainage device, and the water level of the drainage pipe is higher than that of the water inlet 42, so that the slot can be filled with water.
The drainage device comprises a drainage box 51, a lifting frame 56, a partition plate 52, a measuring cylinder 53 and a water tank 55, wherein the drainage box 51 is arranged on the lifting frame 56, the partition plate 52 divides the drainage box into a drainage area on the left side and an overflow area on the right side, a drainage valve 54 is arranged at the bottom of the drainage area, an overflow pipe is arranged on the side face of the overflow area, and the overflow pipe is communicated with the measuring cylinder 53 through a valve. And (3) carrying out monitoring work through a measuring cylinder, measuring the volume of water flowing out in a certain time by using the measuring cylinder and a stopwatch after the water level of the water injection/drainage boxes at the two ends of the fracture device is stable, and calculating the flow.
Therefore, in the embodiment, the heights of the water supply device and the water discharge device relative to the cracks can be adjusted, so that the flow velocity of water flow in the cracks can be changed, and the models in different scenes can be simulated by combining the adjustment of the width of the cracks and the crack surfaces in the embodiment 1.
Example 4: this embodiment is substantially the same as embodiment 1, except that: the embodiment can be adapted to a fracture model of a trapezoid structure.
In this embodiment, the adjusting sleeves 303 are disposed on two sides of the adjusting slit plate, the outer sides of the adjusting sleeves 303 are in a circular arc structure, the springs 304 are disposed in the adjusting sleeves 303, the springs 304 can always press the adjusting sleeves 303 towards the sealing plate, the springs 303 are high-pressure springs to keep sealing between the adjusting sleeves 303 and the sealing plate, the circular arc structure can allow the adjusting slit plate to obliquely prop against the sealing plate 34, and good sealing conditions can still be kept under the oblique condition, so that the invention is applicable to the situation that the slit widths are the same, and also applicable to the situation that the upper sides are oblique, so that the slit model is in a right trapezoid structure, and the simulation range of the slit is enlarged. In order to ensure that the adjusting sleeve 303 cannot deviate from the adjusting slit plate, the inner side of the adjusting sleeve 303 is provided with a limiting pull rod, the outer end of the limiting pull rod is fixed in the adjusting sleeve, the inner end of the limiting pull rod is limited in a limiting groove in the adjusting slit plate and can slide in the limiting groove for a certain distance, but cannot deviate from the limiting groove.
Claims (6)
1. A monitoring device for solute transport with adjustable gap width, characterized in that: comprises a water supply device positioned at a high water level, a crack device and a water discharge device positioned at a low water level; the crack device comprises a bottom plate, a fixed crack plate fixed on the bottom plate, a sealing plate, an upper adjusting crack plate, an adjusting screw rod for adjusting the width of the crack, a pressing device and a sensor for monitoring solute transport; the adjusting screw rod penetrates through the fixed slit plate and the bottom plate, an adjusting end head is arranged at the outer leakage end of the bottom, the upper end of the adjusting screw rod is supported at the bottom of the adjusting slit plate, and the adjusting slit plate is arranged at the upper part of the fixed slit plate at intervals, so that a slit is formed between the adjusting slit plate and the fixed slit plate; a fixed sealing layer and an adjustable sealing layer are respectively and correspondingly arranged between the inner sides of the sealing plates at two sides and the sealing of the fixed slit plate and the adjusting slit plate, so that the two sides of the slit are sealed, the two ends of the slit are open, a water supply tank communicated with a water supply device is arranged at the water supply end of the slit, a water drainage tank communicated with a water drainage device is arranged at the water outlet end of the slit, and solute adding ports and sampling ports communicated with the slit are respectively arranged at the upper side surfaces of the front end and the rear end of the adjusting slit plate; the device comprises a transverse plate, a supporting frame and a compression screw, wherein the transverse plate spans the upper part of an adjusting slit plate, the supporting frame is fixed on a bottom plate, the compression screw is vertically arranged on the transverse plate, two sides of the transverse plate are fixed on the supporting frame, the compression screw is in threaded connection with the transverse plate, the bottom of the compression screw is in pressure contact with the adjusting slit plate through a compression block, a monitoring caulking groove is formed in the fixed slit plate, a sensor is sealed and adjusted in the monitoring caulking groove and is flush with the surface of the fixed slit plate, the sensor comprises a temperature sensor a for monitoring the temperature of a solution in the slit device, a stress sheet b for monitoring the stress of the solution in the slit device and an electrode platinum sheet c for monitoring the conductivity value of the solution in the slit device, the temperature sensor a, the stress sheet b and the electrode platinum sheet c are uniformly distributed on the fixed slit plate in an array, and each row and each column of intersection points of the array comprise the temperature sensor a, the stress sheet b and the electrode platinum sheet c; the side of closing plate runs through electrode d that is arranged in monitoring resistivity, electrode d's inner is in going deep into the crack for monitoring solution resistivity in the slit device, be provided with the mount in the bottom of bottom plate, there is the space for operating adjusting screw and arranging the electric wire in mount and bottom plate, the adjusting end is located this space, so that operating personnel adjusts the relative height of adjusting the slit plate from the bottom, the transmission line that connects the sensor extends from this space simultaneously, be provided with the adjustment sleeve in the both sides of adjusting the slit plate, the outside of adjustment sleeve is circular arc structure, be provided with the spring in the adjustment sleeve, the spring can be pressed the adjustment sleeve all the time to the closing plate, the spring is high-pressure spring so that keeps the seal between adjustment sleeve and the closing plate, circular arc structure can allow the top that adjusts the slit plate slope to touch on the closing plate, and still can bear and have good sealing condition under this slope.
2. The device for monitoring solute transport with adjustable gap width as defined in claim 1, wherein: the width of fixed slit plate be wider than the regulation slit plate, the downside of closing plate is provided with the seal groove, fixed sealing layer sets up in the seal groove, the both sides suit of fixed slit plate is in the seal groove, the bottom of closing plate passes through connecting bolt to be fixed in the both sides of fixed slit plate, connecting bolt runs through fixed sealing layer.
3. The device for monitoring solute transport with adjustable gap width as defined in claim 2, wherein: the fixed sealing layer and the adjustable sealing layer are of an integrated structure, the upper part and the lower part of the adjustable sealing layer are both fixed on the sealing plate, the back surface of the middle part of the adjustable sealing layer is a deformation area, the back surface of the deformation area is provided with a sealing bolt, the bottom of the sealing bolt is provided with a continuous adjusting lath, the adjusting lath is propped against the back surface of the deformation area, and the deformation area is propped against the side surface of the adjustable slit plate.
4. The device for monitoring solute transport with adjustable gap width as defined in claim 1, wherein: the water supply tank comprises a water supply tank body, a flow stabilizing plate, a water diversion plate and a water drain valve, wherein the water supply tank body is fixed on a bottom plate and is in sealing connection with the front ends of the fixed slit plate and the adjustable slit plate, a water inlet communicated with a water supply pipe is formed in the upper portion of the water supply tank body, a water supply port is formed in the middle of a tank wall on the opposite side of the water inlet, the water diversion plate is sleeved in the water supply port and is communicated with the front end of the slit, array water diversion holes are formed in the water diversion plate, the water drain valve is arranged at the bottom of the water supply tank body, the flow stabilizing plate is vertically arranged in the middle of the water supply tank body, and gaps exist between the bottom of the flow stabilizing plate and the tank bottom, so that the water supply tank body is divided into a flow stabilizing region on the left side and a water supply region on the right side, and the bottom of the flow stabilizing region is communicated with the water supply region.
5. The device for monitoring solute transport with adjustable gap width as defined in claim 1, wherein: the water supply device comprises a lifting frame, a water supply tank, a water pump and an overflow plate; the water supply tank is fixed on the lifting frame, so that the water supply level of the water supply tank is adjustable, the overflow plate is vertically arranged in the water supply tank, the water supply tank is divided into a left overflow area and a water injection area, the bottom of the overflow area is communicated with the water tank through the water drain valve, the water tank is used for injecting water into the water injection area through the water pump, and the overflow area is communicated with the water supply tank through the pipeline.
6. The device for monitoring solute transport with adjustable gap width as defined in claim 1, wherein: the drainage tank comprises a drainage tank body, a water drain valve at the bottom, a water inlet at the middle part and a water outlet at the upper part; the water inlet is formed in the middle of a side plate of the tank body and is communicated with a slit, the water outlet and the water drain valve are arranged on the opposite side of the water inlet, the water drain device comprises a water drain box, a lifting frame, a partition plate, a measuring cylinder and a water tank, the water drain box is arranged on the lifting frame, the partition plate divides the water drain box into a water drain area on the left side and an overflow area on the right side, a water drain valve is arranged at the bottom of the water drain area, an overflow pipe is arranged on the side face of the overflow area, and the overflow pipe is communicated with the measuring cylinder through a valve.
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| CN113188958A (en) * | 2021-04-19 | 2021-07-30 | 中国地质大学（武汉） | Fracture overflowing device and fracture seepage visual test system |
| CN114113538B (en) * | 2021-10-20 | 2024-03-26 | 郑州大学 | Assembled three-dimensional cross-fracture polymer grouting visualization device and test method thereof |
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