CN111965019A - Visual integral type soil body unipolar stretching device breaks - Google Patents
Visual integral type soil body unipolar stretching device breaks Download PDFInfo
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- CN111965019A CN111965019A CN202010715640.6A CN202010715640A CN111965019A CN 111965019 A CN111965019 A CN 111965019A CN 202010715640 A CN202010715640 A CN 202010715640A CN 111965019 A CN111965019 A CN 111965019A
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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
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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
- G01N3/02—Details
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
Abstract
The invention discloses a visual integral soil body uniaxial tension device for fracture, which comprises a bottom plate, a visual integral mold, a fixing plate and an oil pressure chest expander, wherein the bottom plate is provided with a first hole and a second hole; the bottom plate is provided with two rows of sliding balls; the visual integrated die is connected to the two rows of sliding balls in a sliding manner; comprises a mould fixing half, a mould stretching half, an L-shaped plate, a fixing bent iron and a sliding strip; the fixed half of the mould is connected with the fixed plate, and the stretching half of the mould is connected with the oil pressure chest expander; a plurality of sliding strips are arranged on the sliding ball between the die fixing half and the die stretching half in a sliding manner in parallel; the L-shaped plate is spliced on two sides of the plurality of sliding strips. The sample chamber is dumbbell-shaped. The sample preparation mold and the movable clamp are integrated, so that the sample demolding and clamping processes are reduced, the detection is simple and convenient, the sample fracture process and the accurate fracture position can be observed, the friction between the visual integrated mold and the bottom plate in the stretching process is reduced by utilizing the two rows of sliding balls, and a more ideal test state is achieved.
Description
Technical Field
The invention relates to a geotechnical test device, in particular to a fracture visualization integrated soil uniaxial stretching device.
Background
The soil is a weathered product of rock and has certain shear strength, compressive strength and tensile strength on the aspect of mechanical properties. However, in engineering construction, the tensile strength of soil is basically not utilized by people, so that the tensile strength of soil is mostly ignored when people study the strength of soil. However, the soil body is sometimes subjected to tensile stress in engineering, which is a problem that cannot be avoided, and the tensile stress action often occurs around tall buildings. Therefore, in recent years, the problem of tensile strength of soil bodies is more and more prominent, and people have attracted wide interest.
The test method for measuring the tensile strength of the soil body mainly comprises the following steps: uniaxial tensile test, triaxial tensile test, soil beam bending test, hollow cylinder test, radial fracturing test, Brazilian splitting test and the like. The uniaxial tensile test and the triaxial tensile test are used for measuring the tensile strength by directly applying axial tension to a sample, and belong to a direct tensile test method; a bending test, a radial fracturing test, an axial fracturing test and a hollow cylinder test of a soil beam are carried out by applying pressure or torque to a sample and calculating the tensile strength of a soil body from the pressure or the torque when the soil sample is damaged according to a certain hypothesis, and belong to an indirect tensile test method.
The stress control type horizontal uniaxial tension meter developed according to the modesty and the like has the advantages that the operation of the test method is convenient, the test result is clear, but the rotating speed is not fixed because the hand wheel is manually controlled, and the condition that whether the eccentric tension occurs in the re-tension process of the sample cannot be solved.
A horizontal uniaxial tension meter developed by Tamrakar has a sample with a 8-shaped section. The new test instrument eliminates the effect of the clamps and the adhesive on the test specimen, but due to the particular mould shape, the preparation of the test specimen is greatly limited and the accuracy of the tensile stress values applied during the test and the local stress values at failure need to be questioned.
The instrument designed by Zhang Hui and Zhujun and the like can adopt a clamp method to carry out soil uniaxial tensile test. The instrument can continuously apply loads which are hooked and adopts the electronic data acquisition, the result of the test instrument is accurate, and the operation is simple. However, the sample is fixed by the clamp, so that slight relative sliding is easy to occur, and the study on the deformation of the soil body is not facilitated.
Traditional unipolar stretching device is all at mould back surface paint the release agent, then begins to make the appearance, accomplishes the system appearance after, takes out the sample from the mould, puts into movable anchor clamps again or with adhesive bonding movable anchor clamps and sample both ends, then tests, and this not only can cause the damage to the sample, and still very loaded down with trivial details, the fixed sample of movable anchor clamps can produce the relative slip phenomenon of microgroove to influence the test result.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a fracture visualization integrated soil uniaxial stretching device, which integrates a sample preparation mold and a movable clamp, reduces sample demolding and clamping processes, is simple and convenient to detect, and can observe a sample fracture process and an accurate fracture position.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a visual integral type soil body unipolar stretching device breaks, includes bottom plate, visual integral type mould, fixed plate and oil pressure chest expander.
The bottom plate position is fixed, and the middle part of bottom plate is provided with two rows of sliding balls that all follow length direction.
The fixed plate is fixedly arranged on the bottom plate at one end of the sliding ball, and the oil pressure chest expander is fixedly arranged on the bottom plate at the other end of the sliding ball.
Visual integral type mould sliding connection is on two rows of sliding balls.
The visual integrated die comprises a die fixing half part, a die stretching half part, an L-shaped plate, a fixing bent iron and a sliding strip.
The fixed half part of the mould and the stretched half part of the mould are arranged on the two rows of sliding balls in a relatively sliding way, and openings are arranged on one opposite sides of the fixed half part of the mould and the stretched half part of the mould. The fixed half of mould is connected with the fixed plate, and the tensile half of mould is connected with the oil pressure chest expander.
And the sliding strips are arranged on the sliding ball between the fixed half part of the mould and the stretching half part of the mould in a sliding mode in parallel, and each sliding strip is arranged along the width direction of the bottom plate.
The L-shaped plate is spliced between the die fixing half part and the die stretching half part on two sides of the plurality of sliding strips, and is detachably connected with the die fixing half part and the die stretching half part through the fixing bent iron.
A dumbbell-shaped sample cavity is formed among the die fixing half, the die stretching half, the L-shaped plate and the sliding strip.
The visual integrated mold further comprises a cover plate capable of covering the top of the sample cavity.
The hydraulic drawing device further comprises a stress sensor, and the stress sensor is arranged on a drawing rod connected with the oil pressure chest expander through the drawing half of the die.
The device also comprises a displacement sensor, wherein the displacement sensor is used for detecting the stretching displacement of the stretching half part of the die.
The device also comprises a collector which is respectively connected with the computer, the stress sensor and the displacement sensor.
The bottom of the fixed half of the mould, the bottom of the stretched half of the mould and the bottom of each sliding strip are provided with sliding grooves matched with the two rows of sliding balls.
The bottom of each sliding ball is nested in the bottom plate, the top of each sliding ball is matched with the sliding groove, and vertical gaps are reserved between the bottom of the fixed half of the mold, the bottom of the stretched half of the mold and the bottom of each sliding strip and the bottom plate.
The bottom of each sliding strip positioned between the two sliding grooves or on the outer side is provided with at least one row of small sliding balls.
Two rows of small sliding balls are arranged at the bottom of each sliding strip between the two sliding grooves and used for ensuring the vertical clearance between the sliding strips and the bottom plate and the sliding stability on the bottom plate.
The invention has the following beneficial effects:
(1) the mould that will system appearance used is directly reformed transform into movable anchor clamps, realizes the integration of mould and movable anchor clamps, saves a series of operations such as drawing of patterns, avoids the sample to damage, avoids movable anchor clamps fixed sample moreover to produce the relative slip phenomenon of microgroove, reduces to exert an influence to the experiment
(2) A plurality of sliding strips are arranged in parallel at the lower end of the sample fracture part, so that the supporting effect can be achieved, and the effect of limiting movement of the whole die can be achieved through the sliding grooves in the sliding strips. When the sliding strip separates each other along sliding ball length direction under the drive of sample, not only can not cause the friction to the sample, cause the influence to the experiment, can also know the position that the crack specifically takes place.
(3) And utilize the sliding ball of multirow different positions, change the contact surface roll that traditional mutual slip becomes the sliding ball, reduce the friction of visual integral type mould tensile in-process and bottom plate, reach more ideal experimental state, the experimental data measurement's of being convenient for accuracy and reliability.
Drawings
Fig. 1 shows a structural schematic diagram of the fracture visualization integrated soil uniaxial stretching device.
FIG. 2 shows an exploded view of a visualization unibody mold of the present invention.
Fig. 3 shows a number of sliders according to the invention and a schematic drawing of the sliders being pulled apart.
Fig. 4 shows a front view of the slide bar of fig. 3.
Fig. 5 shows a schematic view of a base plate according to the invention.
Fig. 6 shows a schematic view of a cover plate according to the invention.
Figure 7 shows a schematic representation of a soil sample of the invention.
Fig. 8 shows a schematic view of the use of the entire device of the present invention.
In fig. 8a, a drawing of the mold halves, slide bars, and mold halves in combination is shown resting on a base plate.
In fig. 8b, a schematic view of a state where an L-shaped plate is added on the basis of a is shown.
Fig. 8c is a schematic view showing a state where a fixed bending iron and a screw are added to b.
Fig. 8d shows a schematic view of the state of the impact compaction sample based on c.
In fig. 8e, a schematic view of the state of mounting the uniaxial tension device on the basis of d is shown.
Fig. 8f is a schematic view showing a state where the fixed bending iron and the screw are detached from each other on the basis of e.
In fig. 8g, a schematic view of the state where the L-shaped plate is detached on the basis of f is shown.
In fig. 8h, a schematic view of the state of fracture after stretching is shown.
Among them are:
1. an oil pressure chest expander; 2. a collector; 3. a data line; 4. a displacement sensor; 5. a stress sensor;
6. drawing the die by half; 6-1, stretching holes;
7. fixing a mold half; 7-1, a sliding groove; 7-2, fixing holes;
8. an L-shaped plate; 9. fixing the bent iron; 10. a screw;
11. a slide bar; 11-1, a sliding groove; 11-2, small sliding balls;
12. a fixing plate; 13. a base plate; 14. a sliding ball; 15. and (7) a cover plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, a visual integral soil body uniaxial tension device of fracture comprises a bottom plate 13, a visual integral mold, a fixing plate 12, an oil pressure chest expander 1, a collector 2, a displacement sensor 4 and a stress sensor 5.
The bottom plate is fixed in position, such as on the ground or a workbench. As shown in fig. 5, the middle of the bottom plate is provided with two rows of sliding balls 14 each along the length direction.
The fixed plate is fixedly arranged on the bottom plate at one end of the sliding ball, and the oil pressure chest expander is fixedly arranged on the bottom plate at the other end of the sliding ball.
The stress sensor is arranged on a stretching rod connected with the oil pressure chest expander on the stretching half of the die.
The displacement sensor is used for detecting the stretching displacement of the stretching half part of the die, and is preferably arranged on an oil pressure chest expander.
The collector is preferably connected with a computer, a stress sensor and a displacement sensor through data lines 3.
Visual integral type mould sliding connection is on two rows of sliding balls.
As shown in fig. 2, the visual integrated mold comprises a mold fixing half 7, a mold stretching half 6, an L-shaped plate 8, a fixing bent iron 9, a sliding bar 11 and a cover plate 15.
The fixed half of mould and the tensile half relative slip setting of mould are on two rows of sliding balls, and one side in opposite directions all is provided with the opening, and the shape is similar to trapezoidal prism, has the shrink section at the opening part.
The bottom of the fixed half of the mould is preferably provided with a sliding groove 7-1 matched with the two rows of sliding balls, and the bottom of the drawing half of the mould is preferably provided with a sliding groove matched with the two rows of sliding balls.
The die holding half is preferably connected to the holding plate via holding bores 7-2, and the die drawing half is preferably connected to the oil-pressure tensioner via drawing bores 6-1.
And the sliding strips are arranged on the sliding ball between the fixed half part of the mould and the stretching half part of the mould in a sliding mode in parallel, and each sliding strip is arranged along the width direction of the bottom plate.
As shown in fig. 3 and 4, the bottom of each slide bar is preferably provided with a slide groove 11-1 for fitting two rows of slide balls. The bottom of each sliding strip positioned between or outside the two sliding grooves is provided with at least one row of small sliding balls 11-2, preferably two rows of small sliding balls, which are used for ensuring the vertical clearance between the sliding strips and the bottom plate and the smoothness of sliding on the bottom plate.
The sliding ball is preferably a hard metal ball, the surface is smooth, one part of the sliding ball is embedded in the bottom plate, one part of the sliding ball is exposed out of the bottom plate and can rotate in the bottom plate, the part of the sliding ball, which is exposed out of the floor, just can be matched with the sliding groove, and the half part of the die, which is stretched, the plurality of rolling strips and the half part of the die, which is fixed, can roll on the sliding ball and have a certain gap (vertical gap) with the bottom plate.
The vertical clearance is arranged, on one hand, the vertical clearance can not contact the bottom plate, and the friction between the bottom of the fixed half of the mold, the stretching half of the mold and the bottom of each sliding strip and the bottom plate is prevented; and on the other hand, to provide a receiving space for the small sliding ball 11-2.
The L-shaped plate is spliced between the die fixing half part and the die stretching half part on two sides of the plurality of sliding strips, and is detachably connected with the die fixing half part and the die stretching half part through the fixing bent iron and the screws 10.
A dumbbell-shaped sample cavity is formed among the die fixing half, the die stretching half, the L-shaped plate and the sliding strip and is used for preparing a soil mass sample shown in figure 7.
The cover plate 15 shown in fig. 6 has a size just slightly smaller than the inner edge of the mold, and preferably covers the top of the sample chamber, and is used for compacting the soil mass through the cover plate 15.
A test method of an integral soil uniaxial tension device comprises the following steps.
Step 1, assembling a visual integrated mold, which specifically comprises the following steps.
The number of the sliding strips is preferably selected according to the length of the soil body sample to be simulated. The longer the length of the soil body sample to be simulated is, the more the number of the sliding strips is, so that the soil body samples with different lengths can be simulated. The stretch width of each slider is preferably 1 cm.
The bottom of the fixed half of the mould, the bottom of each sliding strip and the bottom of the stretched half of the mould are provided with sliding grooves matched with the sliding balls. The bottom of each sliding strip is also preferably provided with a small sliding ball, and friction-free sliding is formed between the small rolling ball and the bottom plate.
Further, the width of the L-shaped plate is preferably selected according to the total stretching width of all the slide bars. The L-shaped plates are preferably formed by splicing two or more standard L-shaped plates with standard widths, so that the L-shaped plates can adapt to different total stretching widths.
Step 2, sample preparation, which specifically comprises the following steps:
step 21, preparing a sample soil body: the mass of water and soil was calculated from the required water content, water was added while stirring the soil, and after mixing, the mixture was allowed to stand sufficiently.
Next, the sample soil after standing was divided into n parts by weight equal to each other, and numbered 1 st part, 2 nd part, … … th part, and n th part, respectively.
Sequentially filling n sample soil bodies into the dumbbell-shaped sample cavities, filling and compacting the soil body samples by adopting a layered compacting method, and assuming that the height of the required sample is H. Firstly, filling and compacting the 1 st soil body at the bottommost part of the mould, if the 1 st soil body is compacted to the height of 1/n, and filling and compacting the 2 nd soil body are carried out on the basis, the work of the compaction hammer from the upper part is acted on the 2 nd soil body when the 2 nd soil body is filled and compacted, and simultaneously, the 1 st soil body below the 2 nd soil body is further compacted, so that the compaction degree of the 1 st soil body is higher than that of the 2 nd soil body. Therefore, in practical operation, the compaction height H1 of the 1 st soil mass is required to be greater than (1/n) H, the compaction height w of the 2 nd soil mass is H2, H1 > H2 > (1/n) H, the compaction height of the third soil mass is H3, H1 > H2 > H3 > (1/n) H, and so on, and finally the compaction degrees of each soil mass are the same, namely, although compaction is carried out in layers, the compaction degree of each layer of the practical sample is the same, and the purpose of compaction in layers is only to avoid the problem that the compaction degrees of the sample are different from top to bottom.
After the compaction of the 1 st soil body is completed, the scraper is used for scraping the surface of the soil body, so that the upper soil body and the 2 nd soil body can be better combined, and the rest can be analogized, and the scraping treatment is also carried out after the compaction of the 2 nd soil body.
And (3) in layered compaction, preferably covering a cover plate on the surface of the sample to be compacted to compact. And after compaction, taking down the cover plate.
Step 4, disassembling the L-shaped plate: the fixed bent iron is firstly disassembled, and the connection between the L-shaped plate and the fixed half part of the mould and the stretching half part of the mould is released. And then disassembling the L-shaped plates positioned at two sides of the plurality of sliding strips. Therefore, soil body samples positioned at the tops of the plurality of sliding strips are exposed outside, and observation is facilitated.
Step 5, stretching: the oil pressure chest expander is started, the die is stretched half gradually, the stress sensor monitors the tensile stress applied to the die by the oil pressure chest expander in real time, the displacement sensor monitors the axial tensile displacement of the die by the die in real time, and the recorded tensile stress and the axial tensile displacement are transmitted to the computer.
And in the stretching process of the mold stretching half, the soil mass of the sample positioned in the mold fixing half and the mold stretching half forms two clamping ends due to the dumbbell-shaped shrinkage effect, and the soil mass sample positioned at the tops of the plurality of sliding strips becomes a stretching deformation part. With the continuous stretching of the oil pressure chest expander, the stretching deformation part of the soil body sample in the step 5 deforms along the stretching direction. Meanwhile, the sliding strip at the bottom of the tensile deformation part slides along the sliding ball along with the soil sample.
During the stretching process, the sliding groove provides a guiding function along the sliding ball on one hand, and on the other hand, the sliding groove and the sliding ball directly form frictionless rolling through the finish treatment of the sliding groove.
And 6, breaking the sample: and the oil pressure chest expander is further stretched, and the stretching deformation part of the soil body sample is broken after reaching the maximum bearing capacity. Meanwhile, the sliding strips positioned right below the fracture part are separated from each other under the driving of the fracture of the sample, so that the fracture position of the sample is recorded.
According to the invention, the integration of the die and the movable clamp can be realized, a series of operations such as demoulding and the like are omitted, the damage of the sample is avoided, the relative sliding phenomenon of fine lines generated when the movable clamp fixes the sample is avoided, and the influence on the experiment is reduced; a plurality of sliding strip is arranged in parallel at sample fracture department lower extreme, not only can play the supporting role, can also be through the sliding tray on the sliding strip to the spacing effect of removing of whole mould, separates each other along sliding ball length direction under the drive of sample as the sliding strip, not only can not cause the friction to the sample, causes the influence to the experiment, can also know the position that the crack specifically takes place.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (9)
1. The utility model provides a visual integral type soil body uniaxial tension device breaks which characterized in that: the device comprises a bottom plate, a visual integrated die, a fixing plate and an oil-pressure chest expander;
the bottom plate is fixed in position, and the middle part of the bottom plate is provided with two rows of sliding balls along the length direction;
the fixed plate is fixedly arranged on the bottom plate at one end of the sliding ball, and the oil pressure chest expander is fixedly arranged on the bottom plate at the other end of the sliding ball;
the visual integrated die is connected to the two rows of sliding balls in a sliding manner;
the visual integrated die comprises a die fixing half, a die stretching half, an L-shaped plate, a fixing bent iron and a sliding strip;
the die fixing half and the die stretching half are arranged on the two rows of sliding balls in a relatively sliding manner, and openings are formed in opposite sides of the die fixing half and the die stretching half; the fixed half of the mould is connected with the fixed plate, and the stretching half of the mould is connected with the oil-pressure chest expander;
the sliding strips are arranged on the sliding ball between the die fixing half and the die stretching half in a sliding mode in parallel, and each sliding strip is arranged along the width direction of the bottom plate;
the L-shaped plate is spliced between the die fixing half and the die stretching half on two sides of the plurality of sliding strips and is detachably connected with the die fixing half and the die stretching half through the fixed bent iron;
a dumbbell-shaped sample cavity is formed among the die fixing half, the die stretching half, the L-shaped plate and the sliding strip.
2. The fracture visualization integrated soil uniaxial stretching device of claim 1, wherein: the visual integrated mold further comprises a cover plate capable of covering the top of the sample cavity.
3. The fracture visualization integrated soil uniaxial stretching device of claim 1, wherein: the hydraulic drawing device further comprises a stress sensor, and the stress sensor is arranged on a drawing rod connected with the oil pressure chest expander through the drawing half of the die.
4. The fracture visualization integrated soil uniaxial stretching device of claim 3, wherein: the device also comprises a displacement sensor, wherein the displacement sensor is used for detecting the stretching displacement of the stretching half part of the die.
5. The fracture visualization integrated soil uniaxial stretching device of claim 4, wherein: the device also comprises a collector which is respectively connected with the computer, the stress sensor and the displacement sensor.
6. The fracture visualization integrated soil uniaxial stretching device of claim 1, wherein: the bottom of the fixed half of the mould, the bottom of the stretched half of the mould and the bottom of each sliding strip are provided with sliding grooves matched with the two rows of sliding balls.
7. The fracture visualization integrated soil uniaxial stretching device of claim 6, wherein: the bottom of each sliding ball is nested in the bottom plate, the top of each sliding ball is matched with the sliding groove, and vertical gaps are reserved between the bottom of the fixed half of the mold, the bottom of the stretched half of the mold and the bottom of each sliding strip and the bottom plate.
8. The fracture visualization integrated soil uniaxial stretching device of claim 6, wherein: the bottom of each sliding strip positioned between the two sliding grooves or on the outer side is provided with at least one row of small sliding balls.
9. The fracture visualization integrated soil uniaxial stretching device of claim 8, wherein: two rows of small sliding balls are arranged at the bottom of each sliding strip between the two sliding grooves.
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| CN202010715640.6A CN111965019B (en) | 2020-07-23 | 2020-07-23 | Visual integral type soil body unipolar stretching device breaks |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390715A (en) * | 2021-06-21 | 2021-09-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Gravel-doped clay stretching device suitable for different gravel-doped particle sizes and testing method |
| CN113533034A (en) * | 2021-08-30 | 2021-10-22 | 石家庄铁道大学 | Soil body tensile test device and soil body tensile test method |
| CN114354352A (en) * | 2021-04-28 | 2022-04-15 | 南昌工程学院 | Soil mass macro-micro tensile characteristic test device and test method |
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