CN111576328A - Utilize magnetic field force to change laboratory bench of gelatinization sand gravel dam model test piece unit weight - Google Patents
Utilize magnetic field force to change laboratory bench of gelatinization sand gravel dam model test piece unit weight Download PDFInfo
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- CN111576328A CN111576328A CN202010306080.9A CN202010306080A CN111576328A CN 111576328 A CN111576328 A CN 111576328A CN 202010306080 A CN202010306080 A CN 202010306080A CN 111576328 A CN111576328 A CN 111576328A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
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- E02B1/02—Hydraulic models
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Abstract
The invention discloses an experiment table for changing the volume weight of a cemented sand gravel dam model test piece by using magnetic field force, which comprises a dam body model test piece and an experiment table, wherein the main aggregate of the dam body model test piece is iron powder, the experiment table is provided with a magnetic field groove, and the experiment table on the left side of the magnetic field groove is provided with a pressure applying unit; a magnetic field unit is arranged in the magnetic field groove, the magnetic field unit comprises a base, a film supporting plate and a permanent magnet, and the dam body model test piece is fixed on the film supporting plate; the dam body model test piece 1 is simple in structure and convenient to use, the volume weight of the dam body model test piece 1 is changed by changing the magnetic field intensity of the test bed through the permanent magnet, the actual stress condition of a dam body prototype is better met, and the magnetic effect of the permanent magnet cannot be changed due to the fact that the test bed, the base and the thin film supporting plate are made of diamagnetic substances, and therefore experimental data are more accurate.
Description
Technical Field
The invention belongs to the field of hydraulic engineering model tests, and particularly relates to a test bed device for changing the volume weight of a cemented sand gravel dam model test piece by using magnetic field force.
Background
The model test is to make the prototype structure into a model according to a similar principle, and the model not only needs to simulate the actual working condition of a hydraulic structure or other types of buildings, but also needs to consider complex mechanical conditions. The model test is a common physical simulation method, and is mainly used for engineering tests which have large volume and complicated construction and cannot perform physical tests, such as a gelled sand gravel model test, an earth-rock dam geotechnical model test and the like. According to the similarity theory, the physical phenomena occurring on the prototype are reduced (enlarged) according to the similarity relation and then simulated on the model. The method mainly comprises the following similarities: geometric similarity, physical similarity, time similarity, boundary condition similarity and initial condition similarity. According to the similarity theory, the hydraulic model needs to satisfy the following similarity criteria:
Cσ＝CLCγ＝CEC
because of the model requirement C＝1，
Therefore, the method comprises the following steps: cσ＝CLCγ＝CE
In conventional model experiments, the four-term similarity constant C of the above formulaσ、CL、Cγ、CEIn, CγThe similar volume weight is usually satisfied by the external load or the self weight of the material, namely C γ1, if one of the other three items is selected, the rest areBoth terms can be calculated based on the above-mentioned similarity criterion. Therefore, the conventional model test is to select a suitable model scale or geometric similarity constant CLThe simulation method limits the selection of the strength of the model material and improves the experimental difficulty.
For example: dry volume weight gamma of rock mass of dam abutment of certain engineeringp＝26KN/m3Ultimate compressive strength R of rock masspc 120MPa, modulus of deformation Ep10000MPa, several model scale schemes are required to be calculated for selection. Measuring the dry volume weight gamma of the model materialm＝24KN/m3Therefore, C isγ1.083; requirement C1, so that different C's are calculatedLSee table 1 for various sets of data.
TABLE 1 different model geometric similarity constants CLIndex comparison table
As can be seen from the table, when C isLWhen 400, the model is small in volume and small in manufacturing workload, but the strength requirement and the deformation modulus of the model material are low, and the strength and the deformation modulus of the model material are required to be lower in weak parts such as a fracture zone in a mountain, so that the model cannot be realized. If the scale of the model is large (e.g. C)L100), the strength and the deformation modulus of the model material are easily satisfied, the measurement precision is also easily achieved, but the model volume reaches 32m3The consumed materials can reach two to three hundred tons, and the realization is difficult.
Therefore, C can be changed without changing other similar conditionsγTo satisfy the pair C in the model testσ、CL、CEAnd the like, thereby meeting different requirements of different working conditions of test simulation.
In a conventional experiment, the volume weight of a model test piece is usually changed by hanging a heavy object outside the test piece, but the method enables the force position borne by the model test piece to be one point, the acting force of the hanging heavy object does not uniformly act on the whole model test piece, and the actual force condition is not met, so that the experiment error is larger; and because the experiment error is big, so in the conventional experiment, often need measure more multiunit experimental data in order to reduce the error that causes because test device restriction to not only increase the consumption of experimental materials, improved experimental cost, but also can lead to the test cycle longer, influence the development speed of experiment progress and relevant subject.
Disclosure of Invention
Aiming at the defects and problems in the existing model test, the invention provides the test bed for changing the volume weight of the gelled sand gravel dam model test piece by using the magnetic field force, the magnetic field intensity of the test bed is changed by using the permanent magnet, so that the volume weight of the model test piece is changed, and the acting force of the permanent magnet on the model test piece is the body load, so that the model test piece is more consistent with the actual stress condition of a prototype, the test error is reduced, the group number of the test data required to be measured in the test is indirectly reduced, and the test time cost and the consumption cost of the test materials are reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: the experiment table for changing the volume weight of the gelled sand gravel dam model test piece by using the magnetic field force comprises a dam body model test piece and a test table, and is characterized in that a magnetic field groove is formed in the middle of the upper end face of the test table downwards, a magnetic field unit is arranged in the magnetic field groove and comprises a base, a film supporting plate and a permanent magnet, the base is fixedly installed in the middle of the bottom of the magnetic field groove, the permanent magnet is installed on the base in a matched mode, and the film supporting plate is fixedly plugged on a notch in the top end of the magnetic field groove; the dam body model test piece is matched and fixed in the middle of the film supporting plate, and is positioned right above the magnetic field groove; the left end face of the dam body model test piece is a water facing face, and a partial pressure cushion block is paved on the water facing face of the dam body model test piece; a pressure applying unit is arranged on the experiment table on the left side of the magnetic field groove, the pressure applying unit comprises an angle adjusting mechanism, a fixed rod and a hydraulic oil cylinder, and the angle adjusting mechanism is fixedly arranged in the middle of the experiment table; the tail end of the fixed rod is hinged and fixed with the angle adjusting mechanism, and the position of the fixed rod can be adjusted by rotating the angle adjusting mechanism, so that the fixed rod and the upstream surface of the dam body model test piece are parallel to each other in the same vertical plane; and the right end face of the fixed rod is sequentially fixed with a plurality of ejection hydraulic cylinders at intervals from top to bottom, and the top ends of the ejection hydraulic cylinders are in contact with the partial pressure cushion blocks.
The angle adjusting mechanism comprises a fixed seat and a lifting hydraulic oil cylinder, the fixed seat is fixed in the middle of the upper end face of the experiment table on the left side of the magnetic field groove through a bolt, an adjusting transverse groove is formed in the middle of the upper end face of the fixed seat downwards, and the tail end of the fixed rod is hinged and fixed in the adjusting transverse groove at the right end of the fixed seat through a pin shaft; the tail end of the lifting hydraulic oil cylinder is hinged and fixed in the adjusting transverse groove at the left end of the fixing seat, the top end of the lifting hydraulic oil cylinder is hinged and fixed with the middle part of the left end face of the fixing rod, and the fixing rod can be pushed or pulled to rotate left and right around the pin shaft through the lifting hydraulic oil cylinder.
The middle part of the left end face of the fixed rod is fixedly welded with a hinged seat, and the top end of the lifting hydraulic oil cylinder is hinged and fixed in the hinged seat through a pin shaft.
The material of the test bed, the material of the film supporting plate and the material of the base all belong to diamagnetic substances.
The film supporting plate is made of hard plastics, and the base is made of gypsum.
The test bed is a concrete casting.
The partial pressure cushion block is a hard sponge or a rubber block.
The main aggregate of the model test piece is iron powder.
The middle part of the upper end surface of the base is downwards provided with a magnet mounting groove, and the permanent magnet is inserted into the magnet mounting groove of the base in a matching manner.
The upper groove opening of the magnetic field groove is outwards provided with a ring frame groove along the peripheral groove wall, and the film supporting plate is installed in the ring frame groove in a matching mode.
The invention has the beneficial effects that: the experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force is simple in structure and convenient to operate, and comprises a dam body model test piece and the experiment table, wherein the main aggregate of the dam body model test piece is iron powder, the experiment table is provided with a magnetic field groove, and the experiment table on the left side of the magnetic field groove is provided with a pressure applying unit; the pressure applying unit applies pressure to the upstream surface of the dam body model test piece through the pressure dividing cushion block for simulating the pressure action of water, so that the pressure dividing cushion block can disperse the point load of the pressure testing unit when the pressure applying unit applies pressure to the dam body model test piece through the pressure dividing cushion block.
The dam body model test piece is fixed on the film supporting plate, the magnetic field intensity of the experiment table is changed by preventing the permanent magnet from changing the magnetic field intensity under the film supporting plate, so that the volume weight of the dam body model test piece is changed, and compared with the existing method that the volume weight of the dam body model test piece is changed by adding a hanging weight, the operation is simpler; and permanent magnet's vertical magnetic force is direct even effect on whole dam body model test piece, so compare with current point effort through adding the hoisting object, change laboratory bench magnetic field intensity through permanent magnet and make the bulk density of dam body model test piece change, more accord with the actual atress condition of dam body prototype, thereby greatly reduced experimental error, it is more accurate to make the experimental data, also indirectly reduce the group number of experimental required measurement experimental data of experiment, the time cost of experiment has been reduced and the material cost who consumes of experiment has been reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic perspective view of the magnetic field slot of the present invention.
FIG. 3 is a schematic sectional view of the test stand of the present invention.
Fig. 4 is a schematic structural view of the base of the present invention.
Fig. 5 is a schematic view of the fixed relationship between the base and the permanent magnet according to the present invention.
FIG. 6 is a schematic view of the fixing method of the film support plate of the present invention.
FIG. 7 is a second schematic view of the fixing method of the film support plate of the present invention.
FIG. 8 is a third schematic view of the fixing method of the film supporting plate of the present invention.
Fig. 9 is a schematic perspective view of the ring frame groove of the present invention.
Fig. 10 is a schematic structural view of the pressing unit of the present invention.
FIG. 11 is a schematic view of the side view of the fixing base of the present invention.
FIG. 12 is a schematic view of the pressure testing unit of the present invention during use.
Reference numbers in the figures: 1 is dam body model test piece, 2 is the test bench, 3 is the pressure cushion, 4 is the magnetic field groove, 5 is the unit of exerting pressure, 51 is the fixing base, 511 is adjusting the cross slot, 512 is fixed pterygoid lamina, 513 is the round pin axle, 52 is lift hydraulic cylinder, 53 is the dead lever, 531 is the hydro-cylinder fixing base, 532 articulated seat, 54 is ejection hydraulic cylinder, 61 is the base, 611 is the magnet mounting groove, 62 is the film backup pad, 63 is permanent magnet, 64 is fixed spacing frame, 65 ring frame grooves, 7 is fixing bolt.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example 1
The embodiment provides a test bench for changing the volume weight of a cemented sand gravel dam model test piece by using magnetic field force, which comprises a dam body model test piece 1 and a test bench 2 in a cuboid structure shape as shown in fig. 1 and 2, wherein the aggregate component of the dam body model test piece 1 is iron powder, a magnetic field groove 4 is downwards formed in the middle of the upper end face of the test bench 2, and the test bench 2 is made of a reverse magnetic substance.
As shown in fig. 3-6, a magnetic field unit is disposed in the magnetic field tank, the magnetic field unit includes a base 61, a film support plate 62 and a permanent magnet 63, the base 61 is made of plaster, the base 61 is adhered to the middle of the bottom of the magnetic field tank 4, a magnet installation groove 611 is formed in the middle of the upper end surface of the base 61, the permanent magnet 63 is inserted into the magnet installation groove 611 of the base 61, and the permanent magnet 63 is not adhered to the plaster because the base 61 is made of plaster, so that the permanent magnet 63 is convenient to install or disassemble.
As shown in fig. 6, the film supporting plate 62 is made of hard plastic, the film supporting plate 62 is fixed on the notch at the top end of the magnetic field slot 4 by plugging with a polymer material adhesive, the dam model test piece 1 is placed in the middle of the film supporting plate and bonded with the film supporting plate 62 by the polymer material adhesive, and at this time, the dam model test piece 1 is located right above the magnetic field slot; because the aggregate component of dam body model test piece 1 is the iron powder, permanent magnet has been placed in the magnetic field groove 4 of dam body model test piece 1 below, so when the peak value pulling force when pulling away from the film support board through the vertical measurement dam body model test piece 1 of tensiometer, peak value pulling force when dam body model test piece 1 pulls away from film support board 62 can receive the size of the vertical magnetic field force of permanent magnet 63 in magnetic field groove 4 and change to the influence changes the equivalent unit weight of dam body model test piece 1, specifically:
Gd＝G+nF (1)
wherein G isdThe equivalent weight of the dam body model test piece 1 is shown, G shows the actual weight of the dam body model test piece 1, nF shows the magnetic force of the permanent magnet 63 on the dam body model test piece 1, and the formula (1) can obtain the following results: the equivalent weight of the dam body model test piece 1 is equal to the actual weight of the dam body model test piece 1 plus the magnetic force of the permanent magnet 63 on the dam body model test piece 1.
Wherein gamma represents the volume weight of the dam body model test piece 1, V represents the volume of the dam body model test piece 1, and can be obtained by the formula (2): the volume weight of the dam body model test piece 1 is equal to the ratio of the equivalent weight of the dam body model test piece 1 to the volume of the dam body model test piece 1.
And permanent magnet's vertical magnetic force is direct even effect on whole dam body model test piece 1, so compare with current point effort through adding the hoisting object, this embodiment device changes laboratory bench magnetic field intensity through permanent magnet and makes the bulk density of dam body model test piece 1 change, more accords with the actual atress condition of dam body prototype, and because the material of laboratory bench 2, base 61 and film backup pad 62 all belongs to the diamagnetic material, so can not change permanent magnet 63's magnetic force effect, thereby make the experimental data more accurate.
As shown in fig. 10, the left end surface of the dam body model test piece 1 is a facing surface, the experiment table 2 on the left side of the magnetic field groove 4 is provided with a pressure applying unit 5, a partial pressure cushion block 3 is paved on the facing surface of the dam body model test piece 1, the partial pressure cushion block 3 is a rubber block or a hard sponge, the pressure applying unit 5 applies pressure to the facing surface of the dam body model test piece 1 through the partial pressure cushion block 3 for simulating the pressure action of water, and the partial pressure cushion block 3 is a rubber block or a hard sponge which has light properties and certain elastoplasticity, so when the pressure applying unit 5 applies pressure to the dam body model test piece 1 through the partial pressure cushion block 3, the partial pressure cushion block 3 can disperse the point load of the pressure testing unit 5, and at the same time, the equivalent bulk density of the dam body model test piece 1 is hardly influenced.
The pressing unit comprises an angle adjusting mechanism, a fixing rod 53 and a pushing hydraulic oil cylinder 54, the angle adjusting mechanism comprises a fixing seat 51 and a lifting hydraulic oil cylinder 52, the fixing seat 51 is fixed in the middle of the upper end face of the experiment table 2 on the left side of the magnetic field groove 4 through a bolt 7, as shown in fig. 11, an adjusting transverse groove 511 is formed in the middle of the upper end face of the fixing seat 51 downwards, and the left end and the right end of the adjusting transverse groove 511 both penetrate through the fixing seat 51 outwards; the tail end of the fixed rod 53 is hinged and fixed in an adjusting transverse groove at the right end of the fixed seat through a pin shaft 513, a hinged seat 532 is fixedly welded in the middle of the left end face of the fixed rod 53, 3 oil cylinder fixed seats 531 are vertically and fixedly welded on the right end face of the fixed rod 53 from top to bottom at intervals, a pushing hydraulic oil cylinder 54 is fixedly sleeved in each oil cylinder fixed seat 531 in a matched mode, and a piston rod of each pushing hydraulic oil cylinder 54 extends out of the oil cylinder fixed seat 531.
The tail end of the lifting hydraulic oil cylinder 52 is hinged and fixed in the adjusting transverse groove 511 at the left end of the fixing seat 51, and the top end of the lifting hydraulic oil cylinder 52 is hinged and fixed in the hinge seat 532 at the middle part of the left end face of the fixing rod 53 through a pin 513, as shown in fig. 12, when the lifting hydraulic oil cylinder 52 is adjusted, the lifting hydraulic oil cylinder 52 can push or pull the fixing rod 53 to rotate left and right around the pin 513 at the tail part of the fixing rod.
When the device is used, the position of the fixing rod 53 is adjusted by controlling the lifting hydraulic oil cylinder 52, so that the fixing rod and the upstream surface of the dam model test piece are parallel to each other in the same vertical plane, and then the pushing hydraulic oil cylinder 54 on the right end surface of the fixing rod 53 is controlled, so that the piston rod of the pushing hydraulic oil cylinder extends outwards and is abutted against the partial pressure cushion block paved on the upstream surface of the dam model test piece, and the test can be started.
When the device is used, influence relation of the number of the permanent magnets 63 in the magnetic field groove 4 on the vertical magnetic force of the dam body model test piece 1 needs to be clarified. Specifically, the method comprises the following steps:
FLi＝G+Fi(3)
wherein FLiShowing the tensile force of the dam body model test piece measured for the ith time, G showing the weight of the dam body model test piece 1 and FiRepresenting the magnetic force of the ith time, and when i is equal to 0, the weight G of the test piece under the action of no magnetic field force can be measured:
Fi＝FLi-G (4)
F0＝FL0-G＝0 (5)
F1＝FL1-G (6)
therefore, the action of the vertical force of each permanent magnet on the magnetic force of the dam body model test piece can be calculated as follows:
ΔFi＝FLi-FLi-1(i＝1,2,3...) (7)
and (3) calculating the average value of the change quantity of the vertical force of the single permanent magnet on the dam body model test piece 1 by measuring several groups:
wherein F represents the vertical magnetic force of a permanent magnet on the dam body model test piece. Through the calculation of the above formula 3-8, the magnitude relation between the number of the permanent magnets and the vertical magnetic field force F borne by the dam body model test piece in the magnetic field range can be found, then after a proper number of permanent magnets are placed in the magnetic field groove 4 according to the test requirement, the film supporting plate 62 is fixed on the notch at the top end of the magnetic field groove 4 through the sealing of the high polymer material glue, and then the test can be started after the dam body model test piece is fixed on the film supporting plate 62.
Compared with the prior mode of hanging a heavy object outside the test piece to change the bulk density of the dam model test piece, the experimental bench device provided by the embodiment changes the magnetic field intensity of the test platform by controlling the number of the permanent magnets, thereby changing the volume weight of the dam model test piece, having simpler operation, and the vertical magnetic force of the permanent magnet directly and uniformly acts on the whole dam model test piece, more conforming to the actual stress condition of the dam prototype, thereby greatly reducing the error of the test, and because the materials of the test bed 2, the base 61 and the film supporting plate 62 all belong to diamagnetic substances, therefore, the magnetic effect of the permanent magnet 63 is not changed, so that the experimental data is more accurate, the accuracy of the experimental data indirectly reduces the number of groups of experimental data required to be measured in the experiment, the time cost of the experiment is reduced, and the material cost consumed in the experiment is reduced.
Example 2
As shown in fig. 7, a fixed limit frame 64 is fixed on the test bed 2 at the notch of the magnetic field slot 4, the diameter of the inner frame opening of the fixed limit frame 64 is larger than the notch of the magnetic field slot 4, the magnetic field slot 4 is located in the fixed limit frame 64, the film support plate 62 is installed in the fixed limit frame 64 in a matching manner, and the film support plate 62 is directly blocked on the magnetic field slot 4 because the diameter of the inner frame opening of the fixed limit frame 64 is larger than the notch of the magnetic field slot 4.
Compare embodiment 1 on this embodiment test bench film support plate 62 and match and install in fixed spacing frame 64, not with the film support plate 62 that will use glue to fix, when using, because the restriction of fixed spacing frame 64, so film support plate 62 can not horizontal migration on the laboratory bench, after the experiment, through the instrument upwards lift up film support plate 62, alright dismantle film support plate 62, it is convenient to dismantle.
Example 3
As shown in fig. 8, the test bed 2 of the present embodiment is directly cast by concrete, and is characterized by large strength and low manufacturing cost, the magnetic field groove 4 is formed downward in the middle of the upper end surface of the test bed 2, as shown in fig. 9, the ring frame groove 65 is formed outward along the groove wall at the upper groove opening of the magnetic field groove 4, the magnetic field groove 4 and the ring frame groove 65 are both reserved grooves preset when the test bed 2 is cast, and compared with the way of the embodiment 2 in which the magnetic field groove 4 is grooved, the present embodiment reduces the grooving time of the magnetic field groove 4, and saves time and cost.
When the device is used, the film supporting plate 62 is directly matched with the sealing and installed in the ring frame groove 65 at the notch of the magnetic field groove 4, and compared with the embodiment 2, the effect of the ring frame groove 65 is consistent with that of the fixed limiting frame 64 in the embodiment 2, but the ring frame groove in the device belongs to a reserved groove, so that the cost for setting the fixed limiting frame 64 is reduced, and the manufacturing time of the test bed 2 is shortened.
Claims (10)
1. The experiment table for changing the volume weight of the gelled sand gravel dam model test piece by using the magnetic field force comprises a dam body model test piece and a test table, and is characterized in that a magnetic field groove is formed in the middle of the upper end face of the test table downwards, a magnetic field unit is arranged in the magnetic field groove and comprises a base, a film supporting plate and a permanent magnet, the base is fixedly installed in the middle of the bottom of the magnetic field groove, the permanent magnet is installed on the base in a matched mode, and the film supporting plate is fixedly plugged on a notch in the top end of the magnetic field groove; the dam body model test piece is matched and fixed in the middle of the film supporting plate, and is positioned right above the magnetic field groove; the left end face of the dam body model test piece is a water facing face, and a partial pressure cushion block is paved on the water facing face of the dam body model test piece; a pressure applying unit is arranged on the experiment table on the left side of the magnetic field groove, the pressure applying unit comprises an angle adjusting mechanism, a fixed rod and a hydraulic oil cylinder, and the angle adjusting mechanism is fixedly arranged in the middle of the experiment table; the tail end of the fixed rod is hinged and fixed with the angle adjusting mechanism, and the position of the fixed rod can be adjusted by rotating the angle adjusting mechanism, so that the fixed rod and the upstream surface of the dam body model test piece are parallel to each other in the same vertical plane; and the right end face of the fixed rod is sequentially fixed with a plurality of ejection hydraulic cylinders at intervals from top to bottom, and the top ends of the ejection hydraulic cylinders are in contact with the partial pressure cushion blocks.
2. The experiment table for changing the bulk density of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein the angle adjusting mechanism comprises a fixed seat and a lifting hydraulic cylinder, the fixed seat is fixed in the middle of the upper end surface of the experiment table on the left side of the magnetic field groove by a bolt, an adjusting transverse groove is formed in the middle of the upper end surface of the fixed seat downwards, and the tail end of the fixed rod is hinged and fixed in the adjusting transverse groove on the right end of the fixed seat by a pin shaft; the tail end of the lifting hydraulic oil cylinder is hinged and fixed in the adjusting transverse groove at the left end of the fixing seat, the top end of the lifting hydraulic oil cylinder is hinged and fixed with the middle part of the left end face of the fixing rod, and the fixing rod can be pushed or pulled to rotate left and right around the pin shaft through the lifting hydraulic oil cylinder.
3. The experiment table for changing the bulk density of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 2, wherein a hinged seat is welded and fixed in the middle of the left end face of the fixing rod, and the top end of the lifting hydraulic oil cylinder is hinged and fixed in the hinged seat through a pin shaft.
4. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein the materials of the experiment table, the film supporting plate and the base are all diamagnetic substances.
5. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 4, wherein the material of the film supporting plate is hard plastic, and the base is made of gypsum.
6. The experiment table for changing the volume weight of the cemented sand and gravel dam model test piece by using the magnetic field force as claimed in claim 4, wherein the experiment table is a concrete casting.
7. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein the partial pressure cushion block is a hard sponge or a rubber block.
8. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein the main aggregate of the model test piece is iron powder.
9. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein a magnet installation groove is formed downwards in the middle of the upper end surface of the base, and the permanent magnet is inserted and installed in the magnet installation groove of the base in a matching manner.
10. The experiment table for changing the volume weight of the cemented sand gravel dam model test piece by using the magnetic field force as claimed in claim 1, wherein a ring frame groove is outwards arranged at the upper groove opening of the magnetic field groove along the peripheral groove wall, and the film supporting plate is installed in the ring frame groove in a matching manner.
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| CN103884827A (en) * | 2014-01-13 | 2014-06-25 | 四川大学 | Magnetic field force-seepage force model test device applicable to earth-rock slope |
| US20160047724A1 (en) * | 2014-08-18 | 2016-02-18 | Korea Institute Of Geoscience And Mineral Resource | Test apparatus for early landslide detection fully-connected with pore water pressure, surface displacement and shear surface |
| CN105548521A (en) * | 2015-12-11 | 2016-05-04 | 中国矿业大学 | Gravity field simulation device and method for open type magnetic gravity model test system |
| CN108267284A (en) * | 2018-03-08 | 2018-07-10 | 大连理工大学 | A kind of dam structure library water pressure simulation system |
| CN109841138A (en) * | 2019-03-28 | 2019-06-04 | 西南石油大学 | A kind of test model and method of the ground foundation simulation sedimentation with Distribution of Magnetic Field |
| CN110736821A (en) * | 2019-10-29 | 2020-01-31 | 中国石油大学(华东) | Model test device of landslide area pipeline safety based on gravity loading material |
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Application publication date: 20200825 |