CN220893823U - Sampling device for taking undisturbed soil sample in triaxial test - Google Patents
Sampling device for taking undisturbed soil sample in triaxial test Download PDFInfo
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- CN220893823U CN220893823U CN202322570575.4U CN202322570575U CN220893823U CN 220893823 U CN220893823 U CN 220893823U CN 202322570575 U CN202322570575 U CN 202322570575U CN 220893823 U CN220893823 U CN 220893823U
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- soil
- dowel bar
- soil sampler
- sampling device
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- 239000002689 soil Substances 0.000 title claims abstract description 118
- 238000005070 sampling Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 73
- 239000010935 stainless steel Substances 0.000 claims abstract description 73
- 238000000926 separation method Methods 0.000 abstract description 3
- 210000002105 tongue Anatomy 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model discloses a sampling device for taking undisturbed soil samples for a triaxial test, belongs to the field of geotechnical engineering, and aims to realize undisturbed acquisition of undisturbed soil samples required by the test. Comprises a soil sampler and a dowel bar; the soil sampler is of a hollow cylinder structure with two ends communicated, and the hollow area is cylindrical; the soil sampler is formed by detachably splicing a plurality of stainless steel valves along the circumferential direction of the soil sampler, an external thread is arranged at the top end of the soil sampler, an internal thread is arranged at the bottom end of a dowel bar, and the bottom end of the dowel bar is in threaded connection with the top end of the soil sampler. According to the utility model, the soil sampler is formed by detachably splicing a plurality of stainless steel valves along the circumferential direction of the soil sampler, so that the sampled soil sample is wrapped by the stainless steel valves, and the undisturbed soil sample with the required size for a test can be obtained on the premise of not disturbing soil after the stainless steel valves are taken down, so that the damage caused by secondary sample separation in a laboratory is greatly avoided, the manual sampling and sample cutting time is greatly saved, and the soil sampler is convenient to use, low in cost and high in practicability, and can well meet the requirements of field sampling.
Description
Technical Field
The utility model belongs to the field of geotechnical engineering, and particularly relates to a sampling device for taking an undisturbed soil sample of a triaxial test.
Background
In recent years, the railway industry in China is rapidly developed. The roadbed is used as a railway transportation foundation, directly bears the action of train dynamic load transmitted by an upper structure, and along with the remarkable increase of traffic load intensity and frequency, the rigidity of a roadbed filler layer is continuously deteriorated, deformation accumulation is aggravated, the stability and safety of train operation are seriously affected, and the development of railway transportation is restricted. The dynamic triaxial test effectively simulates the stress state, physical properties and boundary conditions of roadbed filling materials, and becomes an important means for researching the dynamic characteristics of roadbed. The soil dynamic test technology directly influences the research of soil dynamic characteristics and the development of soil dynamic analysis and calculation, and plays an important role in correctly revealing the dynamic characteristic rule of soil and perfecting the analysis and calculation theory.
While the different states of the soil samples directly influence the test results, most of the current tests are carried out by adopting disturbance soil samples, and students restore the physical state of the disturbance soil samples to the state of original soil as much as possible to reduce test errors, the differences among the porosity, dry density, consolidation state and the like of the soil body are certain compared with the original soil samples, and test conclusion often have larger differences due to different physical properties of the disturbance soil samples. The current dynamic triaxial test is carried out to take undisturbed soil, and the large soil sample is usually cut, so that the size of the undisturbed soil sample can be adapted to a dynamic triaxial instrument.
Therefore, there is a need for an undisturbed soil sampler suitable for the dynamic triaxial test size, which does not disturb the undisturbed soil sample required for the soil acquisition test and can be used for the dynamic triaxial test.
Disclosure of utility model
The utility model aims to provide a sampling device for taking an undisturbed soil sample for a triaxial test, which is used for realizing undisturbed soil sample required by the acquisition test.
The technical scheme adopted by the utility model is as follows: the sampling device for taking the undisturbed soil sample of the triaxial test comprises a soil sampler and a dowel bar; the soil sampler is of a hollow cylinder structure with two ends communicated, and the hollow area is cylindrical; the soil sampler is formed by detachably splicing a plurality of stainless steel valves along the circumferential direction of the soil sampler, an external thread is arranged at the top end of the soil sampler, an internal thread is arranged at the bottom end of a dowel bar, and the bottom end of the dowel bar is in threaded connection with the top end of the soil sampler.
Further, the wall thickness of the stainless steel valve is gradually thinned from top to bottom.
Further, one end of the stainless steel valve along the circumferential direction is provided with a clamping tongue, and the other end is provided with a clamping groove matched with the clamping tongue; the clamping tongues of one stainless steel valve are inserted into the clamping grooves of the other stainless steel valve between two adjacent stainless steel valves.
Further, the clamping tongue penetrates through the top end from the bottom end of the stainless steel valve; the clamping groove penetrates through the top end from the bottom end of the stainless steel valve.
Further, the stainless steel valve has three pieces.
Furthermore, the dowel bar is formed by detachably splicing a plurality of dowel bar sections along the axial direction.
Further, the top of the uppermost dowel bar section is fixed with a horizontally arranged stainless steel plate, the dowel bar section is connected to the center of the stainless steel plate, and the outer edge of the stainless steel plate protrudes out of the outer side wall of the dowel bar section.
Further, two adjacent dowel bar sections are in threaded connection through connecting threads.
Furthermore, graduations are arranged on the outer wall of the dowel bar along the axial direction of the dowel bar.
The beneficial effects of the utility model are as follows: according to the utility model, the soil sampler is formed by detachably splicing a plurality of stainless steel valves along the circumferential direction of the soil sampler, so that the sampled soil sample is wrapped by the stainless steel valves, and the undisturbed soil sample with the required size for a test can be obtained on the premise of not disturbing soil after the stainless steel valves are taken down, so that the damage caused by secondary sample separation in a laboratory is greatly avoided, the manual sampling and sample cutting time is greatly saved, and the soil sampler is convenient to use, low in cost and high in practicability, and can well meet the requirements of field sampling.
The sampling device for taking the undisturbed soil sample in the triaxial test is used for sampling, the soil body is cut and sampled directly by the soil sampler, and the taken soil sample is wrapped in the soil sampler.
The soil sampler and the dowel bar can be disassembled, the soil sampler can be disassembled into smaller stainless steel valves, and the dowel bar is formed in a segmented mode, so that the sampling device for taking the undisturbed soil sample in the triaxial test is simple in structure, easy to disassemble, small in size and convenient to carry.
The stainless steel valve is spliced with the clamping groove through the clamping tongue, the stainless steel valve is in threaded connection with the dowel steel, the dowel steel sections are in threaded connection, the fault rate of the connection mode is low, the stainless steel valve can well adapt to field severe field conditions, the labor is liberated by means of a mechanical structure, the stainless steel valve can adapt to soil in different areas, each part of a sampling system is simple to process, convenient to maintain and replace, the cost is low, and the working efficiency can be effectively improved when field large-scale sampling is carried out.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of an assembly of the geotome;
FIG. 3 is a front view of a stainless steel valve;
Fig. 4 is a front view of a dowel section.
In the figure, a soil sampler 1, a stainless steel valve 1A, a clamping tongue 1B, a clamping groove 1C, a dowel bar 2, a dowel bar section 2A, a stainless steel plate 2B and scales 2C.
Detailed Description
The utility model is further illustrated in the following figures and examples, in which:
The sampling device for taking an undisturbed soil sample of a triaxial test comprises a soil sampler 1 and a dowel bar 2 as shown in figure 1; the soil sampler 1 is of a hollow cylinder structure with two through ends, and the hollow area is cylindrical; as shown in fig. 2, the soil sampler 1 is formed by detachably splicing a plurality of stainless steel valves 1A along the circumferential direction, an external thread is arranged at the top end of the soil sampler 1, an internal thread is arranged at the bottom end of a dowel bar 2, and the bottom end of the dowel bar 2 is in threaded connection with the top end of the soil sampler 1.
According to the utility model, the soil sampler 1 is a part which directly cuts into the soil body and cuts and removes a soil sample, and the dowel bar 2 is used for conveying the soil sampler 1 into the soil body. The soil sampler 1 is of a hollow cylinder structure with two through ends, namely the soil sampler 1 is provided with a hollow area, the hollow area is cylindrical, the top end and the bottom end are open, and the soil sampler 1 is not closed, so that when the soil sampler 1 cuts into the soil body, a cut soil sample enters the hollow area from the bottom end opening of the hollow area.
According to the utility model, the soil sampler 1 is formed by detachably splicing a plurality of stainless steel valves 1A along the circumferential direction of the soil sampler, so that the sampled soil sample is wrapped by the stainless steel valves 1A, and the undisturbed soil sample with the size required by a test can be obtained on the premise that soil is not disturbed after the stainless steel valves 1A are taken down, so that the damage caused by secondary sample separation in a laboratory is greatly avoided, the manual sampling and sample cutting time is greatly saved, and the soil sampler is convenient to use, low in cost and high in practicability, and can well meet the requirements of field sampling.
Compared with the traditional sampling method, the sampling device for taking the undisturbed soil sample in the triaxial test omits large-scale manual excavation, reduces damage to a slope, avoids unnecessary trouble, and reduces transportation capacity for transporting the sample back to a laboratory.
The sampler 1 and the dowel bar 2 can be disassembled, and the sampler 1 can be disassembled into a smaller stainless steel valve 1A, so that the sampling device for taking the undisturbed soil sample in the triaxial test has the advantages of simple structure, easy disassembly and small volume and is convenient to carry. The fault rate is low, can adapt to the abominable field condition in field well, through having liberated the manpower with the help of mechanical structure, can adapt to the soil texture in different areas, each part processing of sampling system is simple, conveniently maintains and changes, and the cost is lower, can improve work efficiency effectively when carrying out the open-air large-scale sample.
To facilitate cutting into the interior of the soil body, the wall thickness of the stainless steel valve 1A is preferably tapered from top to bottom.
In order to facilitate the splicing of the stainless steel valve 1A, preferably, as shown in fig. 2 and 3, one end of the stainless steel valve 1A along the circumferential direction thereof is provided with a clamping tongue 1B, and the other end is provided with a clamping groove 1C adapted to the clamping tongue 1B; between two adjacent stainless steel valves 1A, the clamping tongue 1B of one stainless steel valve 1A is inserted into the clamping groove 1C of the other stainless steel valve 1A. During splicing, after the stainless steel valves 1A are spliced together through the clamping tongues 1B and the clamping grooves 1C, the stainless steel valves are screwed together through external threads at the top end and internal threads at the bottom end of the dowel bar 2. The diameter of the soil sampler 1 can be divided into three sizes of 38mm, 50mm and 100mm, and the heights of the soil sampler are respectively 76mm, 100mm and 200mm, wherein 10mm threads are arranged on the outer side of the top of the soil sampler, and the height of the soil sampler is 76mm, 100mm and 200mm, so that the soil sampler is suitable for a common movable triaxial instrument.
The clamping tongue 1B and the clamping groove 1C can be arranged intermittently along the axial direction of the stainless steel valve 1A, and in order to facilitate processing and manufacturing and subsequent assembly, the clamping tongue 1B preferably penetrates through the top end from the bottom end of the stainless steel valve 1A; the clamping groove 1C penetrates through the top end from the bottom end of the stainless steel valve 1A.
The number of the stainless steel valves 1A is too small, when the stainless steel valves are disassembled, soil samples are easily damaged, the number of the stainless steel valves 1A is too large, the stainless steel valves are inconvenient to assemble, and for interval sampling and convenient assembly, the stainless steel valves 1A are preferably provided with three pieces.
In order to adapt to sampling requirements of different depths, preferably, as shown in fig. 1 and 4, the dowel bar 2 is formed by detachably splicing a plurality of dowel bar sections 2A along the axial direction; the dowel bar section 2A is a hollow structure with two ends penetrating.
According to the setting, according to the requirement of sampling depth, dowel bars 2 with different lengths are spliced through dowel bar segments 2A, samples with different depths can be taken on the premise of not drilling holes, and the disturbance of the drilling holes to soil is avoided. In addition, the dowel bar 2 is formed by sections, is easy to disassemble and is more convenient to carry.
In order to facilitate the application of a force for cutting down a soil sample, it is preferable that the top end of the uppermost dowel bar section 2A is fixed with a horizontally disposed stainless steel plate 2B, the dowel bar section 2A is connected to the center of the stainless steel plate 2B, and the outer edge of the stainless steel plate 2B protrudes from the outer side wall of the dowel bar section 2A.
To facilitate the splicing between the dowel bar segments 2A, two adjacent dowel bar segments 2A are threaded.
In order to facilitate calculation of the sampling depth, it is preferable that a scale 2C is provided on the outer wall of the dowel bar 2 along the axial direction of the dowel bar 2. According to the utility model, the dowel bars 2 are formed in a segmented mode, each segment is 10cm long, when surface soil needs to be taken out through threaded connection, the dowel bars 2 can be spliced to achieve the purpose of sampling when original soil with a large depth or different depths needs to be taken out, and the dowel bars 2 are not needed to be taken out.
The specific use process is as follows:
1. First, according to the test conditions, a suitable sampling position is found and a suitable stainless steel valve 1A size is selected.
2. The stainless steel valve 1A is spliced together according to the bayonet and the groove, the stainless steel valve 1A is sleeved on the outer side of the stainless steel valve 1A by using a rubber band for temporary fixation, then the stainless steel valve 1A is screwed into the dowel bar 2 by using threads, the stainless steel valve 1A is connected with the dowel bar 2 by the threads, and finally the rubber band is taken out. The stainless steel valve 1A is smeared with vaseline around to reduce the friction force between soil and the sleeve.
3. Dowel bar segments 2A of different segments according to sampling depth are spliced above the soil sampler through threads. After the device is assembled, the stainless steel valve 1A is slightly inserted into the soil, and after the instrument is leveled, the stainless steel plate is knocked by a hammer, so that the force can drive the sampler into the soil through the dowel bar.
4. Finally, the soil body at the peripheral part is excavated, the soil sampler is pulled out, the dowel bar is removed, the stainless steel valve 1A is opened, the undisturbed soil sample can be easily taken out, and the operation is completed.
Claims (9)
1. A sampling device for getting original state soil sample of triaxial test, its characterized in that: comprises a soil sampler (1) and a dowel bar (2); the soil sampler (1) is of a hollow cylinder structure with two through ends, and the hollow area is cylindrical; the soil sampler (1) is formed by detachably splicing a plurality of stainless steel valves (1A) along the circumferential direction of the soil sampler, external threads are arranged at the top end of the soil sampler (1), internal threads are arranged at the bottom end of the dowel bar (2), and the bottom end of the dowel bar (2) is in threaded connection with the top end of the soil sampler (1).
2. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 1, characterized in that: the wall thickness of the stainless steel valve (1A) is gradually thinned from the top to the bottom.
3. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 1 or 2, characterized in that: one end of the stainless steel valve (1A) along the circumferential direction is provided with a clamping tongue (1B), and the other end is provided with a clamping groove (1C) matched with the clamping tongue (1B); between two adjacent stainless steel valves (1A), the clamping tongue (1B) of one stainless steel valve (1A) is inserted into the clamping groove (1C) of the other stainless steel valve (1A).
4. A sampling device for taking an undisturbed soil sample in a triaxial test according to claim 3, characterised in that: the clamping tongue (1B) penetrates through the top end from the bottom end of the stainless steel valve (1A); the clamping groove (1C) penetrates through the top end from the bottom end of the stainless steel valve (1A).
5. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 1 or 2, characterized in that: the stainless steel valve (1A) has three pieces.
6. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 1 or 2, characterized in that: the dowel bar (2) is formed by detachably splicing a plurality of dowel bar sections (2A) along the axial direction.
7. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 6, wherein: the top of the uppermost dowel bar section (2A) is fixed with a horizontally arranged stainless steel plate (2B), the dowel bar section (2A) is connected to the center of the stainless steel plate (2B), and the outer edge of the stainless steel plate (2B) protrudes out of the outer side wall of the dowel bar section (2A).
8. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 6, wherein: two adjacent dowel bar sections (2A) are in threaded connection through connecting threads (2D).
9. The sampling device for taking an undisturbed soil sample in a triaxial test according to claim 1 or 2, characterized in that: along the axial direction of the dowel bar (2), scales (2C) are arranged on the outer wall of the dowel bar (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322570575.4U CN220893823U (en) | 2023-09-21 | 2023-09-21 | Sampling device for taking undisturbed soil sample in triaxial test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322570575.4U CN220893823U (en) | 2023-09-21 | 2023-09-21 | Sampling device for taking undisturbed soil sample in triaxial test |
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| Publication Number | Publication Date |
|---|---|
| CN220893823U true CN220893823U (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322570575.4U Active CN220893823U (en) | 2023-09-21 | 2023-09-21 | Sampling device for taking undisturbed soil sample in triaxial test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220893823U (en) |
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2023
- 2023-09-21 CN CN202322570575.4U patent/CN220893823U/en active Active
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