CN116558973A - Controllable multifactor coupled concrete test piece triaxial seepage device and test method - Google Patents
Controllable multifactor coupled concrete test piece triaxial seepage device and test method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
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- 238000005260 corrosion Methods 0.000 claims abstract description 34
- 150000003839 salts Chemical class 0.000 claims abstract description 34
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 230000003204 osmotic effect Effects 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 16
- 238000004146 energy storage Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 72
- 238000003860 storage Methods 0.000 claims description 54
- 239000011259 mixed solution Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005485 electric heating Methods 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
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- 239000003921 oil Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- -1 salt ions Chemical class 0.000 abstract description 12
- 239000002131 composite material Substances 0.000 abstract description 7
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- 239000012466 permeate Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
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- 206010013883 Dwarfism Diseases 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/0019—Compressive
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a controllable multifactor coupled triaxial seepage device and a test method for a concrete test piece, wherein the device comprises a salt corrosion solution preparation system, an axial pressure pressurizing system, a confining pressure pressurizing system and an osmotic pressure pressurizing system, a salt corrosion solution simulation device supplies single or composite salt corrosion seepage liquid, then a preset axial pressure and confining pressure are pressurized to hydraulic oil through an axial pressure pump and a confining pressure pump and then transferred to the concrete test piece, finally the salt corrosion seepage liquid is extracted through a pumping device, and the application of the osmotic pressure is realized by utilizing the conversion effect of an energy storage booster. The triaxial seepage test device can simulate triaxial seepage test of the borehole wall concrete under the multi-factor coupling effects of different salt ions, different underground water temperatures, bearing axial pressure, osmotic pressure, confining pressure and the like, overcomes the defect that the traditional triaxial seepage device lacks consideration of the coupling effects of the underground water salt ions, the formation water temperatures and other factors, and provides a device foundation for developing underground large-burial-depth borehole wall concrete test research and durability evaluation.
Description
Technical Field
The invention relates to the technical field of rock-soil mechanics test instruments, in particular to a controllable multi-factor coupling concrete test piece triaxial seepage device and a test method.
Background
The China is a large country for coal production and consumption, and the development of coal resources is still maintained at a certain strength in a quite long period in the future, and mainly develops western coal resources. Along with the increasing of the tunneling depth of the mine, the stratum environment where the mine well wall structure is located is more severe, especially in the northwest water-containing weak rock stratum in China, well wall concrete is easily corroded by high mineralization groundwater for a long time, so that the durability and bearing capacity of the structure are seriously reduced. In addition, borehole wall concrete is required to withstand the long term effects of high surrounding rock stresses associated with large burial depths and high osmotic water pressures. Therefore, under the comprehensive influence of the above factors, the problem that the well wall structure is invalid when the well wall structure does not reach the design service life of the well wall structure is easy to occur, and even the phenomena of well wall structure rupture and water leakage occur, so that the safety production of the coal mine is seriously influenced. According to engineering geological exploration data, dwarfism is stably set from a mine shaft section of a ceramic negligence map in northwest China to a water-bearing layer section of a coal bed bottom plate SO 4 2- 、HCO 3 - And the content of the three salt ions, namely Cl < - >, is in the first three positions, especially SO 4 2- The maximum content of the composite salt harmful ions reaches 4888.01mg/L, and the existence of the composite salt harmful ions causes extremely strong corrosiveness to the concrete.
At present, aiming at composite salt ions (namely SO) in stratum hypersalinity groundwater in northwest China 4 2- 、HCO 3 - Cl - ) The researches on triaxial seepage test of the well wall concrete, transmission rule of salt ions and the like under the condition of strong corrosion are rarely reported. In view of this, the present invention is directed to a design that simulates the single or multiple application of borehole wall concreteThe triaxial seepage test device under the combined effect of the corrosion of salt ions, the groundwater temperatures of different layers and the combined effect of multiple factors such as bearing axial pressure, osmotic pressure, confining pressure and the like overcomes the defect that the prior triaxial seepage device lacks the effect of considering the coupling of the factors such as groundwater salt ion corrosion and formation water temperature; the real service environment of the well wall structure in different stratum environments is restored to a great extent, and a device foundation is provided for developing underground large-burial-depth well wall concrete test research and durability evaluation.
Disclosure of Invention
This section is intended to summarize some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, which may be simplified or omitted from the present section and description abstract and title of the application to avoid obscuring the objects of this section, description abstract and title, and which is not intended to limit the scope of this invention.
In order to achieve the above purpose, the present invention provides the following technical solutions: a preferable scheme of the triaxial seepage device of the concrete test piece with controllable multifactor coupling comprises a salt corrosion solution preparation system, a shaft pressure pressurizing system, a confining pressure pressurizing system and an osmotic pressure pressurizing system,
the salt corrosion solution preparation system comprises a first solution storage box, a second solution storage box, a third solution storage box, a mixed solution storage box, a solution flowing pipeline, a magnetic stirrer and a base, wherein the bottoms of the first solution storage box, the second solution storage box and the third solution storage box are connected with the solution flowing pipeline, the bottoms of the mixed solution storage boxes are respectively provided with an electric heating plate and a magnetic block, the magnetic blocks are used for controlling the magnetic stirrer to rotate through electrodes positioned at the side ends of the mixed solution storage boxes, so that the solutions in the mixed solution storage boxes are uniformly mixed, the electrodes and the electric heating plates are connected with an electric signal of a control module, the electric heating plates can heat the mixed salt corrosion solution, the crystallization in the solution is prevented from being separated out due to the excessively low room temperature, and the accuracy of the concentration of the mixed solution is ensured;
the osmotic pressure pressurizing system comprises a first control valve, a second control valve, a pumping device, a temperature control heating chamber and a triaxial seepage cavity, wherein an energy storage pressurizer is arranged in the pumping device and is externally connected with a control switch, and the energy storage pressurizer can be regulated and controlled through the control switch, so that salt damage seepage liquid is pressurized in a high precision mode and pressure is kept constant. The salt damage seepage liquid in the mixed solution storage tank flows to the pumping device through the first control valve, sequentially flows forward through the second control valve, the seepage liquid pressure meter and the seepage liquid inlet flowmeter in the seepage liquid flow pipeline under the pressurization pumping of the energy storage booster, enters the triaxial seepage cavity in the temperature control heating chamber, and finally flows out of the pipeline at one end of the seepage liquid outlet flowmeter into the corrosion-resistant waste liquid recovery tank;
the axial pressure pressurizing system comprises an axial pressure pump, an axial pressure gauge and a pressure head, wherein the axial pressure pump pumps hydraulic oil to flow along a pipeline to transfer pressure to the pressure head so as to finish the application of the axial pressure of the concrete test piece;
the confining pressure pressurizing system comprises a confining pressure pump and a confining pressure gauge, wherein the confining pressure pump pumps hydraulic oil to the triaxial seepage cavity, and hydraulic oil and salt damage seepage liquid are isolated through an oil isolation film in the triaxial seepage cavity, so that the confining pressure of the concrete test piece is applied.
As a preferable scheme of the controllable multifactor coupled concrete test piece triaxial seepage device, the invention comprises the following steps: the solution flowing pipeline is respectively provided with a first electromagnetic liquid control valve, a second electromagnetic liquid control valve, a third electromagnetic liquid control valve, a first liquid flowmeter, a second liquid flowmeter and a third liquid flowmeter, and the first electromagnetic liquid control valve, the second liquid flowmeter and the third liquid flowmeter are connected with the control module through electric signals, and the control module can prepare single-salt, two-salt and three-class compound salt solutions in various combination modes by selectively opening the electromagnetic liquid control valves.
As a preferable scheme of the controllable multifactor coupled concrete test piece triaxial seepage device, the invention comprises the following steps: the triaxial seepage cavity is characterized in that a cylindrical permeable stone barrel is further arranged in the triaxial seepage cavity, the concrete test piece is placed in the cylindrical permeable stone barrel, surrounding rock is simulated to surround and attach to a well wall structure in an actual coal mine vertical engineering, and the concrete test piece and two ends of the cylindrical permeable stone barrel are connected with porous permeable plates.
As a preferable scheme of the controllable multifactor coupled concrete test piece triaxial seepage device, the invention comprises the following steps: the opening at the joint of the solution flowing pipeline and the upper end of the mixed solution storage box is in a 45-degree arc chamfer shape, so that the inflow of the mixed solution is increased, and meanwhile, the liquid can be prevented from splashing.
As a preferable scheme of the vertical stability simulation test device for the deep vertical well bore, the invention comprises the following steps: the first solution storage box, the second solution storage box, the third solution storage box, the mixed solution storage box, the solution flow pipeline and the seepage flow pipeline are made of acrylic materials with strong corrosion resistance and transparency and visibility.
The invention also discloses a test method of the concrete test piece triaxial seepage device adopting the controllable multifactor coupling, which comprises the following steps:
s1, starting a control module, selectively opening a first electromagnetic liquid control valve, a second electromagnetic liquid control valve and a third electromagnetic liquid control valve according to actual preparation requirements of salt corrosion solution, controlling an electrode positioned in a mixed solution storage box through the control module when the salt corrosion solution flows into the mixed solution storage box, enabling the electrode to drive a magnetic stirrer to rotate under the action of a magnetic block, and simultaneously starting an electric heating plate;
s2, starting a confining pressure pump, pumping hydraulic oil into the triaxial seepage cavity along a pipeline, and observing the numerical change of a confining pressure gauge;
s3, after confining pressure is stabilized, opening a first control valve, starting a pumping device and a temperature control heating chamber, converting the salt corrosion solution after extraction to a preset osmotic pressure value through an energy storage booster, opening a second control valve after the temperature in the temperature control heating chamber reaches a target value, enabling the salt corrosion solution to flow along an osmotic flow pipeline and enter a porous water permeable plate in a triaxial osmotic flow cavity, transmitting osmotic pressure to a concrete test piece, and recording corresponding values of an osmotic flow inlet flowmeter and an osmotic flow outlet flowmeter at regular time;
and S4, after the osmotic pressure gauge reaches a preset pressure value and tends to be stable, starting the axial pressure pump, pumping hydraulic oil to the pressure head along the pipeline, and transmitting and acting the axial pressure to the concrete test piece through the pressure head.
Finally, the permeability value of the well wall concrete under the common coupling actions of multiple factors such as single or composite salt ions erosion, underground water temperatures at different layers and bearing axial pressure, osmotic pressure, confining pressure is calculated through a Darcy law permeability calculation formula, and in addition, the device can also finish the measurement of parameters such as the well wall concrete strength and the like under the multi-factor coupling.
The invention has the beneficial effects that: compared with the prior art, the triaxial seepage device overcomes the defect that the prior triaxial seepage device lacks consideration of the coupling effect of factors such as salt ion erosion in underground water, formation water temperature and the like; the triaxial seepage test of the well wall structure under the common coupling actions of multiple factors such as single or composite salt ions of erosion, underground water temperatures of different layers and bearing axial pressure, osmotic pressure and confining pressure can be greatly restored, and a device foundation can be provided for carrying out underground large-burial-depth well wall concrete test research and durability evaluation.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of the overall structure of a triaxial seepage device for a concrete specimen with controllable multifactor coupling provided by the invention;
reference numerals in the drawings: 1, a control module; 2 a first solution reservoir; 3 a second solution reservoir; 4 a third solution reservoir; 5 a first liquid flow meter; 6 a second liquid flow meter; a third liquid flow meter; 8, a first electromagnetic liquid control valve; 9, a second electromagnetic liquid control valve; 10 a third electromagnetic liquid control valve; 11 solution flow through the tubing; 12 a mixed solution storage tank; 13 electrodes; 14 an electric heating plate; 15 magnetic blocks; 16 magnetic stirrer; 17 base; 18 a first control valve; 19 pumping device; 20 an energy storage supercharger; 21 a control switch; 22 a second control valve; 23 permeate pressure table; 24 permeate inlet flow meter; 25 permeate flow through the conduit; 26 shaft pressure gauge; 27 shaft pressure pump; a 28 ram; 29 temperature control heating chamber; 30 triaxial seepage cavity; 31 a cylindrical permeable stone drum; 32 concrete test pieces; 33 sealing rings; 34 porous water permeable plate; 35 oil-insulating films; 36 confining pressure pump; 37 confining pressure gauge; 38 permeate outlet flow meter; 39 corrosion resistant waste recovery tank.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, which are only examples for convenience of illustration, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to the schematic diagram 1, the embodiment provides a controllable multi-factor coupled triaxial seepage device for a concrete specimen, which comprises a salt corrosion solution preparation system, a shaft pressure pressurizing system, a confining pressure pressurizing system and an osmotic pressure pressurizing system,
the salt corrosion solution preparation system comprises a first solution storage tank 2, a second solution storage tank 3, a third solution storage tank 4, a mixed solution storage tank 12, a solution flow pipeline 11, a magnetic stirrer 16 and a base 17, wherein the bottoms of the first solution storage tank 2, the second solution storage tank 3 and the third solution storage tank 4 are connected with the solution flow pipeline 11, an electric heating plate 14 and a magnetic block 15 are respectively arranged at the bottom of the mixed solution storage tank 12, the magnetic block 15 controls the magnetic stirrer 16 to rotate through an electrode 13 positioned at the side end of the mixed solution storage tank 12, so that the solutions in the mixed solution storage tank are uniformly mixed, the electrode 13 and the electric heating plate 14 are connected with an electric signal of the control module 1, the electric heating plate can heat the mixed salt corrosion solution, the precipitation of crystals in the solution caused by the excessively low room temperature is prevented, and the accuracy of the concentration of the mixed solution is ensured;
the osmotic pressure pressurization system comprises a first control valve 18, a second control valve 22, a pumping device 19, a temperature control heating chamber 29 and a triaxial seepage cavity 30, wherein an energy storage booster 20 is arranged in the pumping device 19 and is externally connected with a control switch 21, and the energy storage booster can be regulated and controlled through the control switch, so that high-precision pressurization is carried out on salt damage seepage liquid, and the pressure is kept constant. The salt harmful seepage liquid in the mixed solution storage tank 12 flows to the pumping device 19 through the first control valve 18, sequentially flows forward through the second control valve 22, the seepage liquid pressure meter 23 and the seepage liquid inlet flowmeter 24 in the seepage liquid flow pipeline 25 by pressurizing and pumping through the energy storage booster 20, enters the triaxial seepage cavity 30 of the temperature control heating chamber 29, and finally flows out from the pipeline at one end of the seepage liquid outlet flowmeter 38 into the corrosion-resistant waste liquid recovery tank 39;
the axial pressure pressurizing system comprises an axial pressure pump 27, an axial pressure gauge 26 and a pressure head 28, wherein the axial pressure pump 27 pumps hydraulic oil to transfer pressure to the pressure head 28 along the pipeline flow so as to finish the application of the axial pressure of the concrete test piece 32;
the confining pressure pressurizing system comprises a confining pressure pump 36 and a confining pressure gauge 37, the confining pressure pump 36 pumps hydraulic oil to the triaxial seepage cavity 30, and hydraulic oil and salt damage seepage liquid are isolated through an oil isolation film 35 in the triaxial seepage cavity 30, so that the confining pressure of the concrete test piece 32 is applied.
Further, the solution flow pipeline 11 is respectively provided with a first electromagnetic liquid control valve 8, a second electromagnetic liquid control valve 9, a third electromagnetic liquid control valve 10, a first liquid flowmeter 5, a second liquid flowmeter 6 and a third liquid flowmeter 7, and all are connected with the electric signal of the control module 1, and the control module can prepare single-salt, two-salt and three-class compound salt solutions in a multi-class combined mode by selectively opening the electromagnetic liquid control valves.
Further, the cylindrical permeable stone drum 31 is further disposed in the triaxial seepage cavity 30, and the concrete test piece 32 is disposed in the cylindrical permeable stone drum 31, so as to simulate the surrounding and attaching state of surrounding rock to the well wall structure in the actual coal mine vertical engineering, and both ends of the concrete test piece 32 and the cylindrical permeable stone drum 31 are connected with the porous permeable plates 34.
Further, the opening at the junction of the solution flowing pipe 11 and the upper end of the mixed solution storage tank 12 is in a 45-degree arc chamfer shape, which can increase the inflow amount of the mixed solution and ensure that the liquid does not splash.
Further, the first solution storage tank 2, the second solution storage tank 3, the third solution storage tank 4, the mixed solution storage tank 12, the solution flow channel 11 and the seepage flow channel 25 are made of acrylic materials with strong corrosion resistance and transparency and visibility.
The embodiment also discloses a test method of the controllable multifactor coupled concrete test piece triaxial seepage device, which comprises the following steps:
s1, starting a control module 1, selectively opening a first electromagnetic liquid control valve 8, a second electromagnetic liquid control valve 9 and a third electromagnetic liquid control valve 10 according to actual preparation requirements of salt corrosion solution, controlling an electrode 13 positioned in a mixed solution storage box 12 through the control module 1 when the salt corrosion solution flows into the mixed solution storage box 12, enabling the electrode 13 to drive a magnetic stirrer 16 to rotate under the action of a magnetic block 15, and simultaneously starting an electric heating plate 14;
s2, starting a confining pressure pump 36, pumping hydraulic oil into the triaxial seepage cavity 30 along a pipeline, and observing the numerical change of a confining pressure gauge 37;
s3, after confining pressure is stabilized, opening a first control valve 18, starting a pumping device 19 and a temperature control heating chamber 29, converting the salt corrosion solution after extraction to a preset osmotic pressure value through an energy storage booster 20, opening a second control valve 22 after the temperature in the temperature control heating chamber 29 reaches a target value, enabling the salt corrosion solution to flow along an osmotic flow pipeline 25 into a porous water permeable plate 34 in a triaxial osmotic flow cavity 30, transmitting osmotic pressure to a concrete test piece 32, and recording corresponding values of an osmotic flow inlet flowmeter 24 and an osmotic flow outlet flowmeter 38 at regular time;
and S4, after the osmotic pressure gauge 23 reaches a preset pressure value and tends to be stable, starting the axial pressure pump 26, pumping hydraulic oil to the pressure head 28 along a pipeline, and transmitting and applying axial pressure to the concrete test piece 32 through the pressure head 28.
Finally, the permeability value of the well wall concrete under the common coupling actions of multiple factors such as single or composite salt ions erosion, underground water temperatures at different layers and bearing axial pressure, osmotic pressure, confining pressure is calculated through a Darcy law permeability calculation formula, and in addition, the device can also finish the measurement of parameters such as the well wall concrete strength and the like under the multi-factor coupling.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the invention, the scope of the invention is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (6)
1. A controllable multifactor coupled concrete test piece triaxial seepage device which is characterized in that: comprises a salt corrosion solution preparation system, a shaft pressure pressurizing system, a confining pressure pressurizing system and an osmotic pressure pressurizing system,
the salt corrosion solution preparation system comprises a first solution storage box (2), a second solution storage box (3), a third solution storage box (4), a mixed solution storage box (12), a solution circulation pipeline (11), a magnetic stirrer (16) and a base (17), wherein the bottoms of the first solution storage box (2), the second solution storage box (3) and the third solution storage box (4) are connected with the solution circulation pipeline (11), an electric heating plate (14) and a magnetic block (15) are respectively arranged at the bottom of the mixed solution storage box (12), the magnetic block (15) controls the magnetic stirrer (16) to rotate through an electrode (13) positioned at the side end of the mixed solution storage box (12), and the electrode (13) and the electric heating plate (14) are connected with an electric signal of a control module (1);
the osmotic pressure pressurizing system comprises a first control valve (18), a second control valve (22), a water pumping device (19), a temperature control heating chamber (29) and a triaxial seepage cavity (30), wherein an energy storage booster (20) is arranged in the water pumping device (19) and is externally connected with the control switch (21), salt damage seepage liquid in the mixed solution storage tank (12) flows to the water pumping device (19) through the first control valve (18), and sequentially flows downstream through the second control valve (22), a seepage hydraulic pressure meter (23) and a seepage liquid inlet flowmeter (24) in a seepage liquid flow pipeline (25) through pressurization pumping of the energy storage booster (20), then enters the triaxial seepage cavity (30) of the temperature control heating chamber (29), and finally flows out of a pipeline at one end of the seepage liquid outlet flowmeter (38) into the anti-corrosion waste liquid recovery tank (39);
the axial pressure pressurizing system comprises an axial pressure pump (27), an axial pressure gauge (26) and a pressure head (28), wherein the axial pressure pump (27) pumps hydraulic oil to transfer pressure to the pressure head (28) along the pipeline flow so as to finish the application of the axial pressure to the concrete test piece (32);
the confining pressure pressurizing system comprises a confining pressure pump (36) and a confining pressure gauge (37), wherein the confining pressure pump (36) pumps hydraulic oil to the triaxial seepage cavity (30), and hydraulic oil and salt damage seepage liquid are isolated through an oil isolation film (35) in the triaxial seepage cavity (30), so that the application of confining pressure to the concrete test piece (32) is completed.
2. The controllable multifactor coupled concrete specimen triaxial seepage device according to claim 1, wherein: the solution flow pipeline (11) is respectively provided with a first electromagnetic liquid control valve (8), a second electromagnetic liquid control valve (9), a third electromagnetic liquid control valve (10), a first liquid flowmeter (5), a second liquid flowmeter (6) and a third liquid flowmeter (7), and the first electromagnetic liquid control valve, the second electromagnetic liquid control valve and the third electromagnetic liquid control valve are connected with the control module (1) through electric signals.
3. The controllable multifactor coupled concrete specimen triaxial seepage device according to claim 1, wherein: the triaxial seepage cavity (30) is internally provided with a cylindrical permeable stone barrel (31), the concrete test piece (32) is placed in the cylindrical permeable stone barrel (31), and both ends of the concrete test piece (32) and the cylindrical permeable stone barrel (31) are connected with porous permeable plates (34).
4. The controllable multifactor coupled concrete specimen triaxial seepage device according to claim 1, wherein: the opening at the joint of the solution flowing pipeline (11) and the upper end of the mixed solution storage box (12) is in a 45-degree arc chamfer shape.
5. The controllable multifactor coupled concrete specimen triaxial seepage device according to claim 1, wherein: the first solution storage box (2), the second solution storage box (3), the third solution storage box (4), the mixed solution storage box (12), the solution flow pipeline (11) and the seepage flow pipeline (25) are made of acrylic materials with strong corrosion resistance and transparent visibility.
6. A method of testing a triaxial seepage apparatus for a concrete specimen using the controllable multifactor coupling of any one of claims 1 to 5, characterized by: the method comprises the following steps:
s1, starting a control module (1), selectively opening a first electromagnetic liquid control valve (8), a second electromagnetic liquid control valve (9) and a third electromagnetic liquid control valve (10) according to the actual preparation requirement of salt corrosion solution, and controlling an electrode (13) positioned in a mixed solution storage box (12) through the control module (1) when the salt corrosion solution flows into the mixed solution storage box (12) so as to drive a magnetic stirrer (16) to rotate under the action of a magnetic block (15), and simultaneously starting an electric heating sheet (14);
s2, starting a confining pressure pump (36), pumping hydraulic oil into the triaxial seepage cavity (30) along a pipeline, and observing the numerical variation of a confining pressure gauge (37);
s3, after confining pressure is stabilized, opening a first control valve (18), starting a pumping device (19) and a temperature control heating chamber (29), converting the salt corrosion solution after extraction to a preset osmotic pressure value through an energy storage booster (20), opening a second control valve (22) after the temperature in the temperature control heating chamber (29) reaches a target value, enabling the salt corrosion solution to flow into a porous water permeable plate (34) in a triaxial seepage cavity (30) along a seepage flow pipeline (25) and transmitting osmotic pressure to a concrete test piece (32), and recording corresponding values of a seepage flow meter (24) and a seepage flow meter (38) at regular time;
and S4, after the osmotic pressure gauge (23) reaches a preset pressure value and tends to be stable, starting the axial pressure pump (26), pumping hydraulic oil to the pressure head (28) along the pipeline, and transmitting and acting the axial pressure to the concrete test piece (32) through the pressure head (28).
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