CN114486448A - Method for manufacturing multi-angle V or U-shaped cracks of stretched soil sample - Google Patents
Method for manufacturing multi-angle V or U-shaped cracks of stretched soil sample Download PDFInfo
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- CN114486448A CN114486448A CN202210145774.8A CN202210145774A CN114486448A CN 114486448 A CN114486448 A CN 114486448A CN 202210145774 A CN202210145774 A CN 202210145774A CN 114486448 A CN114486448 A CN 114486448A
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- 239000002689 soil Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000005056 compaction Methods 0.000 claims abstract description 6
- 230000035515 penetration Effects 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000009417 prefabrication Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a method for manufacturing a multi-angle V or U-shaped crack of a tensile soil sample, which belongs to the technical field of geotechnical engineering tests and comprises the following steps: a01: firstly, assembling a tensile soil sample mold, assembling a left end bottom plate, a middle bottom plate and a right end bottom plate together through clamping grooves, inserting two baffles without crack notches into the mold through the clamping grooves, and placing a soil sample in the mold; a02: after the compaction rod is used for compacting the soil sample layer by layer, two baffle plates without crack gaps are taken down and inserted into the two baffle plates with crack gaps again; a03: inserting a soil sample through the crack gap by using a cutter; a04: and taking down the baffle and the bottom plate, reserving the clamping section mould, applying tensile force to two ends of the clamping section mould, and taking the exposed stretching section soil sample containing the prefabricated crack as the final soil sample required by the test. According to the invention, the crack notches are prefabricated on the front baffle and the rear baffle, so that the accuracy of the position, the inclination angle, the size and the shape of the crack tip in the soil sample is ensured, and the repeated processing and finishing are avoided.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering geotechnical tests, in particular to a method for manufacturing a multi-angle V-shaped or U-shaped crack of a tensile soil sample.
Background
Because the low tensile strength of the soil body is not used as a design basis, the influence on the safety stability in the actual engineering is very easy to be ignored, the influence of the factors such as drying shrinkage, transverse stress reduction or differential settlement and the like on the soil body, particularly cohesive soil, causes the tensile stress in the soil body to exceed the tensile strength to generate local tensile cracks, further causes a large number of problems of geotechnical and geological engineering, for example, the drying shrinkage tensile cracks of the soil body can cause the bearing capacity of foundation soil to be reduced, the safety of an upper building structure is influenced, the tensile cracks of a clay core wall of a dam can cause leakage and even the dam body to burst, for a waste disposal warehouse, if the tensile cracks of a clay layer of an isolation belt occur, the leakage of pollutants can be caused, the negative influence is caused on the environment, in addition, the tensile cracks of a slope top can also reduce the stability of the soil slope, the penetration of rainwater into the slope body is accelerated, and the landslide disaster risk is increased, in a word, the rapid development of urban construction and the development of underground space, and the frequent extreme climate caused by the influence of global climate change, make the problem of tension cracks in geotechnical engineering more and more obvious;
the stress-strain relation, the tensile strength and the expansion direction and the path of the crack of the soil body are inevitably influenced by the position, the inclination angle and the crack tip form of the existing tension crack, the further crack of the soil body can cause the serious degradation of the engineering property, and the safety and the stability of an overground house, an underground impermeable layer, a structure for burying nuclear waste and a side slope are threatened, so that the influence rule and the mechanism problem of the tension crack of the soil body caused by the existing crack are required to be researched from the building construction to the complex environmental protection problem.
At present, the tension cracking of a soil body is mainly to carry out a tensile test on a complete soil sample by a direct method or an indirect method so as to determine the tensile strength and the tensile deformation of the soil body, but the tensile test related to the soil body containing cracks is not common, the main reason is that the prefabrication of the cracks in the soil body is difficult and critical, and the method for prefabricating the cracks in the soil body mainly comprises the following steps: cutting the edge of the soil body by a thin blade or a steel saw to form an edge crack; or burying a thin steel sheet or a mica sheet along the compaction direction, and taking out the steel sheet or the mica sheet after the soil body is compacted to form cracks in the soil body; a plastic or paper sheet is directly put into the soil body to simulate the cracks in the soil body;
the methods are mainly designed aiming at the soil sample of the soil compression test, do not specially aim at the stretching soil sample, after all, the tensile strength of the soil is lower than the compressive strength, and is easier to be interfered by external force, if the middle crack of the stretching soil sample is prefabricated by a blade or a steel saw, not only the crack meeting the test requirement is difficult to be accurately manufactured, but also the operation is very inconvenient, and the original state of the soil sample is easy to be interfered, and the test result is influenced, moreover, the shape and the sample preparation mode of the stretching soil sample are different from that of the compressive soil sample, the method is difficult to realize the prefabrication of the cracks with various angles at different positions in the stretching soil sample, and the influence rule of the cracks with different positions, different inclination angles and different crack shapes in the stretching soil sample is the first precondition for comprehensively researching the stretching problem of the soil mass containing the crack, so the invention aims at the defects of the prefabrication methods, and provides a method for prefabricating the cracks of the stretching soil sample, the method is carried out after the complete soil sample is compacted, so that the influence of compaction layer by layer is avoided, the operation is simple and convenient, and the prefabrication of cracks at different angles, different crack tip forms and different positions can be met.
Disclosure of Invention
The invention aims to solve the problems and provides a method for manufacturing a multi-angle V-shaped or U-shaped crack of a tensile soil sample.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for manufacturing a multi-angle V or U-shaped crack of a stretched soil sample comprises the following steps:
a01: firstly, assembling a tensile soil sample mold, assembling a left end bottom plate, a middle bottom plate and a right end bottom plate together through clamping grooves, respectively fixing a left end clamping mold and a right end clamping mold on the left end bottom plate and the right end bottom plate by utilizing bolts, inserting two baffles without crack notches into the mold through the clamping grooves, and placing a soil sample in the mold;
a02: compacting the soil sample layer by using a compaction rod, taking down two baffle plates without crack gaps after the soil sample with the required size of the test is achieved, and reinserting the two baffle plates with crack gaps, wherein the gap positions and angles of the two crack gaps are consistent;
a03: inserting a soil sample through a crack gap by using a cutter with the same section and crack gap form, determining the insertion depth of the cutter according to the scale on the cutter, taking out the cutter after the requirement is met, and prefabricating the crack;
a04: and taking down the baffle and the bottom plate, reserving the clamping section mould, applying tensile force to two ends of the clamping section mould, and taking the exposed stretching section soil sample containing the prefabricated crack as the final soil sample required by the test.
Further, A01 the drawing soil sample mould includes bottom plate and centre gripping section mould, the bottom plate comprises left end bottom plate, middle part bottom plate, right-hand member bottom plate, the draw-in groove has been seted up to one side of left end bottom plate and right-hand member bottom plate, the middle part bottom plate passes through the card limit of both sides and docks the installation with the draw-in groove of left end bottom plate and right-hand member bottom plate respectively.
The clamping section mould comprises a left end clamping mould and a right end clamping mould, and a baffle is detachably arranged between the left end clamping mould and the right end clamping mould.
Further characterized in that the baffle is a crack notch-free baffle.
The cutting tool is characterized in that the baffle is a baffle with a crack notch, and the crack tip of the crack notch is of a prefabricated V shape or a prefabricated U shape and is used for the penetration and the penetration of the cutting tool.
The soil sample pre-fabricated crack detection device is characterized in that the cutter comprises a cutter handle and a blade, scale marks are reserved on the blade, and the depth of the pre-fabricated crack in the soil sample can be conveniently determined through the scale marks.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the crack notches are prefabricated on the front baffle and the rear baffle, so that the accuracy of the position, the inclination angle, the size and the shape of the crack tip in the soil sample is ensured, the repeated processing and finishing are avoided, and the interference on the soil sample is reduced.
(2) The invention realizes the form of the cracks in the soil sample by prefabricating the crack template on the baffle plate in advance, thereby ensuring one-time forming.
(3) The invention adopts the detachable baffle, can realize prefabrication of various crack forms, and has simple and convenient operation and quick manufacture.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a left end base plate of the present invention;
FIG. 3 is a schematic view of the bottom plate of the present invention;
FIG. 4 is a schematic view of a right end base plate of the present invention;
FIG. 5 is a schematic view of a left end clamp mold of the present invention;
FIG. 6 is a schematic view of a right-hand clamping die of the present invention;
FIG. 7 is a schematic view of a crack-free notch baffle of the present invention;
FIG. 8 is a schematic view of a V-shaped baffle of the present invention having an upper edge with a 30 degree angle of inclination;
FIG. 9 is a schematic view of a V-shaped baffle of the present invention having a median dip angle of 60 degrees;
FIG. 10 is a schematic view of a U-shaped split baffle of the present invention having a medial tilt angle of 60 degrees;
FIG. 11 is a schematic view of the inventive tool.
In the figure: 1. the left end clamps the mould; 2. clamping the mold at the right end; 4. a baffle plate; 5. a base plate; 9. and (4) a cutter.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-11, a method for manufacturing a multi-angle V-shaped or U-shaped crack of a tensile soil sample comprises the following steps:
a01: firstly, assembling a tensile soil sample mold, assembling a left end bottom plate, a middle bottom plate and a right end bottom plate together through clamping grooves, respectively fixing a left end clamping mold 1 and a right end clamping mold 2 on the left end bottom plate and the right end bottom plate by utilizing bolts, then inserting two baffle plates 4 without crack notches into the mold through the clamping grooves, placing a soil sample in the mold, wherein the widths and the lengths of the two crack notches can be designed and manufactured according to test requirements, the widths of the crack notches are 0.5mm, the lengths of the crack notches are 8mm, and the inclination angles of the crack notches are 0 ︒ -90 ︒;
a02: compacting the soil sample layer by using a compaction rod, taking down two baffle plates 4 without crack gaps after the soil sample with the required size of the test is achieved, and reinserting the two baffle plates 4 with crack gaps, wherein the gap positions and angles of the two crack gaps are consistent;
a03: inserting a soil sample through a crack gap by using a cutter 9 with the same section and crack gap form, determining the insertion depth of the cutter 9 according to the scale on the cutter 9, taking out the cutter 9 after the requirement is met, and prefabricating the crack;
a04: taking down the baffle 4 and the bottom plate 5, reserving the clamping section mould, forming a required crack in the stretching section of the soil sample, and applying pulling force at two ends of the clamping section mould to carry out a stretching test of the soil sample containing the crack;
wherein, the tensile soil sample die comprises a bottom plate 5 and a clamping section die, the bottom plate comprises a left end bottom plate, a middle bottom plate and a right end bottom plate, one side of the left end bottom plate and one side of the right end bottom plate are provided with clamping grooves, the middle bottom plate is respectively in butt joint installation with the clamping grooves of the left end bottom plate and the right end bottom plate through clamping edges at two sides, the clamping section die comprises a left end clamping die 1 and a right end clamping die 2, a baffle 4 is detachably arranged between the left end clamping die 1 and the right end clamping die 2, according to the use requirement, the baffle 4 without crack gap can be selected, the baffle 4 with crack gap can also be selected, the crack tip of the crack gap is a prefabricated V-shaped or U-shaped, used for the penetration and the penetration of a cutter 9, the cutter 9 comprises a handle and a blade, the blade is provided with scale marks, the depth of the prefabricated crack in the soil sample can be conveniently determined through the scale marks, and the length of the blade is 50mm and is slightly larger than the thickness of the soil sample and the distance between the two baffles 4 on the mold.
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 attributes 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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A method for manufacturing a multi-angle V-shaped or U-shaped crack of a stretched soil sample is characterized by comprising the following steps:
a01: firstly, assembling a tensile soil sample mold, assembling a left end bottom plate, a middle bottom plate and a right end bottom plate together through clamping grooves, respectively fixing a left end clamping mold and a right end clamping mold on the left end bottom plate and the right end bottom plate by utilizing bolts, inserting two baffles without crack notches into the mold through the clamping grooves, and placing a soil sample in the mold;
a02: compacting the soil sample layer by using a compaction rod, taking down two baffle plates without crack gaps after the soil sample with the required size of the test is achieved, and reinserting the two baffle plates with crack gaps, wherein the gap positions and angles of the two crack gaps are consistent;
a03: inserting a soil sample through a crack gap by using a cutter with the same section and crack gap form, determining the insertion depth of the cutter according to the scale on the cutter, taking out the cutter after the requirement is met, and prefabricating the crack;
a04: and taking down the baffle and the bottom plate, reserving the clamping section mould, applying tensile force to two ends of the clamping section mould, and taking the exposed stretching section soil sample containing the prefabricated crack as the final soil sample required by the test.
2. The method for manufacturing the multi-angle V-shaped or U-shaped cracks of the stretched soil sample according to claim 1, wherein the method comprises the following steps: a01 the drawing soil sample mould includes bottom plate and centre gripping section mould, the bottom plate comprises left end bottom plate, middle part bottom plate, right-hand member bottom plate, the draw-in groove has been seted up to one side of left end bottom plate and right-hand member bottom plate, the middle part bottom plate passes through the card limit of both sides and docks the installation with the draw-in groove of left end bottom plate and right-hand member bottom plate respectively.
3. The method for manufacturing the multi-angle V-shaped or U-shaped cracks of the stretched soil sample according to claim 2, wherein the method comprises the following steps: the clamping section mould comprises a left end clamping mould and a right end clamping mould, and a baffle is detachably arranged between the left end clamping mould and the right end clamping mould.
4. The method for manufacturing the multi-angle V-shaped or U-shaped cracks of the stretched soil sample according to claim 3, wherein the method comprises the following steps: the baffle is a baffle without a crack notch.
5. The method for manufacturing the multi-angle V-shaped or U-shaped cracks of the stretched soil sample according to claim 3, wherein the method comprises the following steps: the baffle is a baffle with a crack notch, and the crack tip of the crack notch is a prefabricated V shape or a prefabricated U shape and is used for the penetration and the penetration of a cutter.
6. The method for manufacturing the multi-angle V-shaped or U-shaped cracks of the stretched soil sample according to claim 1, wherein the method comprises the following steps: the cutter comprises a cutter handle and a blade, scale marks are reserved on the blade, and the depth of the prefabricated crack in the soil sample can be conveniently determined through the scale marks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210145774.8A CN114486448B (en) | 2022-02-17 | 2022-02-17 | Manufacturing method of stretching soil sample multi-angle V or U-shaped crack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210145774.8A CN114486448B (en) | 2022-02-17 | 2022-02-17 | Manufacturing method of stretching soil sample multi-angle V or U-shaped crack |
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| CN114486448A true CN114486448A (en) | 2022-05-13 |
| CN114486448B CN114486448B (en) | 2024-04-12 |
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| CN114486448B (en) | 2024-04-12 |
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