CN112268776B - Preparation method of fractured soil compressive strength test sample - Google Patents
Preparation method of fractured soil compressive strength test sample Download PDFInfo
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- CN112268776B CN112268776B CN202011282725.6A CN202011282725A CN112268776B CN 112268776 B CN112268776 B CN 112268776B CN 202011282725 A CN202011282725 A CN 202011282725A CN 112268776 B CN112268776 B CN 112268776B
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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
- G01N1/286—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
- G01N2001/2873—Cutting or cleaving
Abstract
The invention discloses a preparation method of a sample for testing the compressive strength of fractured soil. The preparation method comprises the following steps: providing a die, wherein the die comprises a shell, a cavity is formed in the shell, and a cutting guide groove communicated with the cavity is formed in the shell; filling a soil sample into the cavity of the mold; cutting the soil sample in the mold along the cutting guide groove to form a crack on the soil sample; and taking out the cut soil sample from the mold to obtain the fractured soil compressive strength test sample. The fracture network of the soil sample prepared by the invention has controllability and repeatability.
Description
Technical Field
The invention belongs to the field of soil mechanics property tests, and relates to a preparation method of a compressive strength test sample, wherein the compressive strength test sample is a soil sample with cracks.
Background
In recent years, the frequency and intensity of extreme drought occurrences has increased due to global climate change. During the drying process, the soil loses water and undergoes volume shrinkage, and when the shrinkage is limited or the induced tensile stress exceeds the tensile strength of the soil, cracks are formed, which is called cracking. Cracking can significantly affect the mechanical properties of the soil and its performance in (environmental) geotechnical engineering geological engineering fields (such as foundations, pavements, slopes, dams, landfill covers, etc.). On one hand, the generation of cracks can damage the integrity of the soil body, and soft and weak areas are generated in the soil body, so that the strength of the soil body is reduced and the compressibility of the soil body is increased, and engineering geological problems such as landslide, debris flow and the like are induced; on the other hand, the cracks can provide a preferential path for the infiltration of water flow, increase the pore water pressure in the soil body, reduce the effective stress and also cause negative influence on the mechanical property of the soil body. With the continuous development of digital image technology, crack indexes (surface crack ratio, total crack length, average crack width, fractal dimension and the like) are generally adopted to evaluate the cracking degree of the soil body. At present, the influence of the existence of cracks on the mechanical properties of the soil body is mostly concentrated on the qualitative aspect, namely the cracks weaken the strength of the soil body and increase the compressibility of the soil body, and the relationship between the quantitative analysis of crack networks with different forms (different crack indexes: surface crack ratio, total crack length, average crack width, fractal dimension and the like) and the mechanical properties (compressive strength, shear strength, compressibility and the like) of the soil body is not clear.
The hydrous soil sample is exposed to the air to be dehydrated and evaporated, and the volume of the hydrous soil sample is shrunk, so that cracks are generated. The generation of cracks has obvious influence on the physical and mechanical properties of the soil body. Most of the current researches focus on quantitative description and mechanism explanation of the soil body cracking development process, and few scholars quantitatively research the relationship between the fracture parameters (surface fracture ratio, total fracture length, average fracture width, fractal dimension and the like) of the fracture-containing soil and the mechanical properties of the soil body by preparing the fracture-containing soil.
The most common way to prepare fractured soils is by drying a hydrous soil sample. To investigate the effect of the presence of fissures on soil strength, Tang et al (2020) [1] prepared a compression-resistant soil sample (d: 50 mm; h: 100mm) containing fissures by drying the soil sample. Firstly, Tang et al (2020) [1] put wet soil (25% moisture content) of a certain mass into a mold for compaction for 4 times; then, the soil sample obtained by compaction is placed on a porous plate and dried to a set water content under the condition of room temperature (22 +/-2 ℃), and then the fissure soil is obtained. Similar methods were used to prepare split-containing direct shear samples, which were produced by drying direct shear samples (d: 60.8 mm; h: 20mm) of different compactities at low temperature (70 ℃) and high temperature (105 ℃) in a natural air-drying environment, such as Xun et al (2011) [2], Huangzhi quan et al (2014) [3], Wei Bixu et al (2014) [4], Chen Kaishi (2018) [5], Huang et al (2019) [6 ]. The above-described method has the following problems: 1) the method is relatively in accordance with the repeated rainfall-evaporation conditions in the field, but the cracks generated in the drying process have great randomness and no reproducibility; 2) the drying process produces a fracture network consisting of a series of transverse, longitudinal and oblique fractures. Even under the condition of the same fracture ratio, total fracture length, average fracture width and fractal dimension, the strength reduction of samples by transverse, longitudinal and oblique fractures with different proportions is different, and the conventional means cannot study the strength reduction.
Disclosure of Invention
In view of the above technical problems, the present invention aims to provide a preparation method of a fractured soil compressive strength test sample, wherein the fracture network of the prepared soil sample has controllability and repeatability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a fracture soil compressive strength test sample comprises the following steps:
providing a die, wherein the die comprises a shell, a cavity is formed in the shell, and a cutting guide groove communicated with the cavity is formed in the shell;
filling a soil sample into a cavity of the mold;
cutting the soil sample in the mold along the cutting guide groove to form a crack on the soil sample; and
and taking out the cut soil sample from the mold to obtain the fractured soil compressive strength test sample.
Preferably, a plurality of said dies are provided, at least one of the orientation, position, length and width of said cutting guide slots being different on different dies. The direction of the cutting guide groove specifically refers to the extending direction of the cutting guide groove, for example, a groove extending along the axial direction of the die is called a longitudinal groove, a groove extending along the direction perpendicular to the axial direction of the die is called a transverse groove, and a groove obliquely intersecting with the axial direction of the die is called a diagonal groove. Through the combination of different moulds, a soil sample with a prospective fracture network can be prepared.
More preferably, the preparation method specifically comprises the following steps:
filling a soil sample into a cavity of a first mold;
cutting a soil sample positioned in the first mold along a cutting guide groove of the first mold to form a first crack on the soil sample;
taking the cut soil sample out of the first mold and filling the soil sample into a cavity of a second mold; and
cutting the soil sample located within the second mold along the cutting guide of the second mold to form a second fissure on the soil sample;
wherein the cutting guide groove of the first die and the cutting guide groove of the second die have different trends or positions.
Preferably, the soil sample is cut by inserting a blade of a cutting tool into the cutting guide groove, and the depth of insertion of the blade is controlled by a depth control mechanism on the cutting tool.
Preferably, the soil sample is cut by inserting a blade into the cutting guide groove, and the crack has a desired width by using a blade having a specific thickness.
Preferably, the soil sample in the mold is cut by a cutting tool.
More preferably, the cutting tool comprises:
a base plate for carrying the mold;
a mold fixing mechanism for fixing the mold to the base plate; and
the cutting mechanism is provided with a blade which can move relative to the bottom plate;
during cutting, a portion of the blade is inserted into the cavity through the cutting guide slot.
Furthermore, the mold fixing mechanism comprises a fixed clamp and a movable clamp, the fixed clamp is arranged on the bottom plate, the movable clamp is movably arranged on the bottom plate through an adjusting component, and a jaw for accommodating the mold is formed between the fixed clamp and the movable clamp.
Furthermore, the fixed clamp is rotatably arranged on the bottom plate, and the die fixing mechanism further comprises a locking piece used for locking the fixed clamp on the bottom plate after the fixed clamp is rotated to a desired angle.
Further, the adjusting assembly comprises an adjusting rod movably arranged on the bottom plate, and one end of the adjusting rod is rotatably connected to the movable clamp.
Furthermore, the fixed pincers are rotatably connected to the bottom plate through a first pivot, the axis of the first pivot extends in the vertical direction, sliding grooves are formed in the fixed pincers, the sliding grooves deviate from the first pivot and extend along an arc line, the circle of the arc line is located on the axis of the first pivot, and the locking pieces are inserted in the sliding grooves.
Furthermore, an adjusting rod mounting seat is fixedly arranged on the bottom plate, the adjusting rod is a horizontally extending screw rod, the adjusting rod can be rotatably arranged in the adjusting rod mounting seat in a penetrating mode around the axis line of the adjusting rod, the adjusting rod is in threaded connection with the adjusting rod mounting seat, and one end portion of the adjusting rod is rotatably connected to the movable clamp through a second pivot shaft extending in the vertical direction.
Furthermore, the cutting tool further comprises a support and a pull rod, the pull rod is horizontally movably arranged on the bottom plate, the lower end portion of the support is rotatably connected to one end portion of the pull rod, the cutting mechanism is arranged on the support, and the cutting tool further comprises a locking piece used for locking the pull rod on the bottom plate after the pull rod is moved to a desired position.
Further, the cutting tool further comprises a depth control rod arranged on the support or the cutting mechanism, and a positioning end capable of being abutted against the bottom plate is arranged on the lower end portion of the depth control rod.
Further, the depth control rod is movably arranged on the bracket up and down.
Further, the cutting guide groove includes one or more of a transverse groove, a longitudinal groove, and a diagonal groove.
Furthermore, a groove is formed in the part, located below the blade, of the bottom plate.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
according to the preparation method, the soil sample is filled into the mold, the cutting guide groove is formed in the mold, the soil sample can be cut along the cutting guide groove, the cracks are further formed, controllable cracks (trend, width and depth) can be cut on the surface of the soil sample, the crack soil mechanical property test sample is prepared, the repeatability of the crack form is realized, the purpose of researching the influence of different crack networks on the soil mechanical property is achieved, and finally support is provided for the influence of different cracks (crack networks) on the soil strength of an engineering field under natural conditions.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a perspective view of a cutting tool according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of a cutting tool according to an embodiment of the present invention;
FIGS. 3a to 3f are schematic distribution diagrams of several cracked soil compression-resistant samples, respectively;
fig. 4a to 4d are distribution diagrams of several fissure soil direct shear samples respectively.
Wherein:
1. a mold; 11. cracking; 2. a base plate; 21. a groove; 22. an adjusting rod fixing seat; 23. a pull rod fixing seat; 3. a mold fixing mechanism; 31. fixing pliers; 311. a first pivot; 312. a chute; 313. a locking member; 32. moving a clamp; 321. a second pivot; 33. adjusting a rod; 34. a button; 4. a cutting mechanism; 41. a blade; 42. an angle grinder; 5. a support; 50. a handle; 51. a nut; 6. a pull rod; 61. a third pivot; 64. a locking member; 7. a depth control rod; 71. and a positioning end.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and is not intended to limit the present invention.
The embodiment provides a preparation method of a fracture soil compressive strength test sample, which comprises the following steps:
providing a die, wherein the die comprises a shell, the shell is provided with a cavity for filling fractured soil, and a cutting guide groove communicated with the cavity is formed in the shell of the die;
filling a soil sample into a cavity of a mold;
cutting the soil sample in the mold along the cutting guide groove to form a crack on the soil sample; and
and taking out the cut soil sample from the mold to obtain the fractured soil compressive strength test sample.
The preparation method is implemented as follows:
filling a soil sample into a cavity of a first mold;
cutting a soil sample positioned in a first mold along a cutting guide groove of the first mold to form a first crack on the soil sample;
taking the cut soil sample out of the first mold and filling the soil sample into a cavity of a second mold;
cutting the soil sample located within the second mold along a cutting guide of the second mold to form a second fissure on the soil sample;
the cutting guide groove of the first die and the cutting guide groove of the second die are different in trend or position.
When the expected fracture network on the soil sample contains a plurality of fractures, the third mold can be continuously replaced, and the steps can be repeated until the cutting of all the fractures is completed.
Referring to fig. 1 to 2, a mold 1 includes a housing having a cavity for filling crevice soil, and a cutting guide groove communicating with the cavity is formed in the housing of the mold 1. Specifically, the die 1 is a substantially hollow cylindrical body, and the cutting guide groove is formed in the side wall of the die 1.
The soil sample in the die is cut by a cutting tool. The cutting tool comprises a base plate 2, a die fixing mechanism 3 and a cutting mechanism 4. The bottom plate 2 is used for bearing the mold 1, and the mold fixing mechanism 3 is used for fixing the mold 1 on the bottom plate 2. The cutting mechanism 4 comprises a blade 41 which is movable relative to the base plate 2. The cutting tool has a cutting operation state in which a part of the blade 41 is inserted into the die 1 through the cutting guide groove. During preparation, a soil sample is filled into the mold 1 and then is fixed on the bottom plate 2 through the mold fixing mechanism 3, and the blade 41 of the cutting mechanism 4 is inserted into the cavity along the cutting guide groove to cut the soil sample, so that a crack is formed.
The cutting guide groove includes one or more of a transverse groove, a longitudinal groove and a diagonal groove. Referring to fig. 3a to 3f and 4a to 4d, by replacing different dies 1, wherein the cutting guide grooves on different dies 1 have different directions, positions and widths, the cracks 11 with different shape combinations can be formed on the soil sample. As shown in fig. 3a, a set of mutually parallel transverse slits are formed in the surface of the test specimen. As shown in fig. 3b, a set of longitudinal slits are formed in parallel on the surface of the sample. As shown in fig. 3c, a transverse slit and a longitudinal slit are formed on the surface of the test piece, and the transverse slit and the longitudinal slit intersect with each other. As shown in fig. 3d, the sample surface was formed with transverse slits and oblique slits intersecting each other. As shown in fig. 3e, an inclined slit is formed on the surface of the sample. As shown in fig. 3f, the sample surface was formed with intersecting longitudinal and oblique slits. As shown in fig. 4a to 4d, the test piece is formed with slits extending in different depths in the radial direction.
Referring to fig. 2 and 3, the mold fixing mechanism 3 includes a fixed jaw 31 and a movable jaw 32, and a jaw for accommodating the mold 1 is formed between the fixed jaw 31 and the movable jaw 32. The fixed jaw 31 is disposed on the base plate 2, and the movable jaw 32 is movably disposed on the base plate 2 via an adjusting assembly, so that the size of the jaw can be adjusted. Wherein, the fixed jaw 31 is rotatably disposed on the bottom plate 2, the mold fixing mechanism 3 further comprises a locking member 313 for locking the fixed jaw 31 on the bottom plate 2 after the fixed jaw 31 is rotated to a desired angle, the adjusting assembly comprises an adjusting rod 33 movably disposed on the bottom plate 2, and one end of the adjusting rod 33 is rotatably connected to the movable jaw 32. Specifically, the fixed jaw 31 is rotatably connected to the base plate 2 by a first pivot 311, an axial line of the first pivot 311 extends in an up-down direction, a sliding slot 312 is formed in the fixed jaw 31, the sliding slot 312 deviates from the first pivot 311 and extends along an arc, a circle of the arc is located on the axial line of the first pivot 311, and the locking member 313 is inserted into the sliding slot 312. The locking member 313 may specifically employ a screw. The bottom plate 2 is fixedly provided with an adjusting rod mounting seat 22, the adjusting rod 33 is a horizontally extending screw rod, and the adjusting rod 33 can be rotatably arranged in the adjusting rod mounting seat 22 around the axis line of the adjusting rod 33 and is in threaded fit with the adjusting rod mounting seat 22. One end of the adjustment lever 33 is rotatably connected to the movable clamp 32 via a second pivot 321 extending in the vertical direction, and the axis of the second pivot 321 and the axis of the first pivot 311 are parallel to each other. When there is a chute in the cutting guide slot on the mold 1, the fixed jaw 31 can be rotated to a desired angle, and the movable jaw 32 can also rotate by a corresponding angle around the second pivot 321 to clamp the mold 1 in the jaw, and at this time, the blade 41 is in line with the chute to cut an oblique slit. The other end of the adjusting lever 33 is provided with a knob, and when the size of the jaw is adjusted, the knob is rotated to rotate the adjusting lever 33, and the adjusting lever 33 moves relative to the base plate 2 under the action of the screw thread to drive the movable clamp 32 to move, thereby achieving the purpose of adjusting the size of the jaw.
The cutting tool also includes a holder 5 and a pull rod 6. Wherein the pull rod 6 is arranged on the bottom plate 2 in a horizontally movable manner. The lower end of the bracket 5 is rotatably connected to one end of a pull rod 6, and the cutting mechanism 4 is arranged on the bracket 5. The cutting tool further comprises a locking member 64 for locking the pull rod 6 to the base plate 2 after the pull rod 6 has been moved to a desired position. Specifically, a pull rod fixing seat 23 is fixedly arranged on the bottom plate 2, and the pull rod 6 is horizontally movably arranged on the pull rod fixing seat 23 in a penetrating manner. The locking member 64 may be a screw connected to the drawbar fixing seat 23 and the drawbar 6. One end of the pull rod 6 and the lower end of the bracket 5 are rotatably connected by a third pivot 61, and the axis line of the third pivot 61 extends in the horizontal direction and is perpendicular to the moving direction of the pull rod 6. A handle 50 for a user to operate is formed on an upper end portion of the holder 5.
The depth of the blade inserted into the die is controlled by a depth control mechanism of the cutting tool, and the depth of the crack is further controlled. The depth control mechanism specifically comprises a depth control rod 7 arranged on the bracket 5 or the cutting mechanism 4, and a positioning end 71 capable of being abutted against the bottom plate 2 is arranged on the lower end part of the depth control rod 7. When the handle 50 is pressed downwards to enable the blade 41 to be inserted into the soil sample to a desired depth (namely, the maximum cutting depth), the positioning end 71 of the depth control rod 7 is abutted against the bottom plate 2, the handle 50 cannot be pressed downwards continuously, and the blade 41 cannot be inserted continuously, so that the depth of a crack formed by cutting is ensured to be in accordance with the expectation.
Further, a depth control rod 7 is provided on the carriage 5 movably up and down, so that the maximum cutting depth can be adjusted to obtain fractures of different desired depths. Specifically, the depth control rod 7 is a screw extending in the vertical direction, a nut 51 is fixedly provided on the holder 5, and the screw is inserted into the nut 51 and screwed thereto. By turning the screw, the height of the positioning end 71 can be adjusted. The screw is provided with a scale value corresponding to the cutting depth so as to control the cutting depth.
The bottom plate 2 is provided with a transverse groove 21 at a position below the blade 41. The above-described cutting mechanism 4 includes an angle grinder 42, and a blade 41 is carried and driven by the angle grinder 42, and the blade 41 is detachably attached to the angle grinder 42 so as to be replaceable.
The preparation method of the embodiment can be used for cutting a soil sample to form a fractured soil compressive strength test sample of a specific fracture, and can form the fracture of a specific form (trend, width, depth and the like) on the soil sample, wherein the controllability and repeatability of a soil sample fracture network are realized through cutting guide grooves of different shapes on the surface of the mold 1, and the specific method is as follows.
1) Different die 1 surfaces are carved with different trends (horizontal, vertical and oblique) and cutting guide grooves formed by combining the trends. In the process of cutting the cracks on the surface of the soil sample, the soil sample is first loaded into a specific mold 1, and then a desired crack network is cut on the surface of the soil sample along the cutting guide grooves on the surface of the mold 1 using a blade 41. On one hand, the cutting guide groove on the surface of the die 1 can avoid the problems of non-straight cutting and uncontrollable trend in the direct cutting process; on the other hand, the direct cutting of the soil sample may cause great disturbance to the surface of the sample, even destroy the soil structure, and the use of the die 1 for cutting can effectively avoid the above adverse conditions. Fig. 3a to 3f show the crack shapes of several specific compression-resistant test sample surfaces, and fig. 4a to 4d show the crack shapes of several specific direct shear test samples.
2) On the basis of cutting out the crack with a specific trend, controllability of the width and the depth of the crack is also realized. The width of the slit is mainly controlled by the thickness of the blade 41 of the cutting mechanism 4 and the width of the cutting guide groove of the surface of the die 1, and the depth of the slit is controlled by controlling the height of the downward movement of the cutting mechanism 4.
3) In the cutting process, if the cutting is not downward cutting along the diameter direction, the diameter of the blade and the diameter of the soil sample are controlled to be on the same straight line in the vertical direction in the cutting process, a groove is formed in the bottom plate 2 and is located right below the blade, when a longitudinal crack is cut, the soil sample is placed on the groove, and the cut crack points to the circle center.
The preparation method has the following advantages: controllable cracks (trend, width and depth) can be cut on the surface of the soil sample, and repeatability of crack forms is realized; after different molds 1 are replaced, fracture combinations (different trends, widths and depths) in any shapes can be cut on the surface of a sample; by studying the compressive strength of the soil sample under different fracture forms, the relationship between fracture parameters (surface fracture ratio, total fracture length, average fracture width, fractal dimension and the like) and the fracture soil strength can be established, so that the reduction of the soil body strength caused by the cracks under natural conditions can be better understood.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A preparation method of a fractured soil compressive strength test sample is characterized by comprising the following steps:
providing a plurality of dies, wherein each die comprises a shell, a cavity is formed in each shell, a cutting guide groove communicated with the cavity is formed in each shell, and at least one of the trend, the position, the length and the width of the cutting guide grooves on different dies is different;
filling a soil sample into a cavity of a first mold;
cutting a soil sample positioned in the first mold along a cutting guide groove of the first mold to form a first crack on the soil sample; and
taking the cut soil sample out of the first mold and placing the soil sample into a cavity of a second mold;
cutting the soil sample located within the second mold along a cutting guide of the second mold to form a second fissure on the soil sample;
wherein, cut the soil sample in the mould through cutting means, cutting means includes:
a base plate for carrying the mold;
a mold fixing mechanism for fixing the mold to the base plate; and
the cutting mechanism is provided with a blade which can move relative to the bottom plate;
when cutting, part of the blade is inserted into the cavity through the cutting guide groove;
the die fixing mechanism comprises a fixed clamp and a movable clamp, the fixed clamp is rotatably arranged on the bottom plate, and the die fixing mechanism further comprises a locking piece used for locking the fixed clamp on the bottom plate after the fixed clamp rotates to a desired angle; the movable clamp is movably arranged on the bottom plate through an adjusting component; a jaw for accommodating the die is formed between the fixed clamp and the movable clamp;
the cutting tool further comprises a support and a pull rod, the pull rod is horizontally movably arranged on the bottom plate, the lower end portion of the support is rotatably connected to one end portion of the pull rod, the cutting mechanism is arranged on the support, and the cutting tool further comprises a locking piece used for locking the pull rod on the bottom plate after the pull rod is moved to a desired position;
the mould is a hollow cylindrical barrel, and the cutting guide groove of at least one of the first mould and the second mould extends along the longitudinal direction to form a longitudinal crack on the side surface of the soil sample, wherein the longitudinal crack extends from one bottom surface of the soil sample to the other bottom surface of the soil sample; the bottom plate is provided with a groove used for enabling the cut longitudinal crack to point to the circle center, and the groove is located under the blade.
2. The production method according to claim 1,
wherein the cutting guide groove of the first die and the cutting guide groove of the second die have different trends or positions.
3. The method of claim 1, wherein the depth of insertion of the blade is controlled by a depth control mechanism on the cutting tool.
4. The method of claim 1, wherein: and inserting a blade into the cutting guide groove to cut the soil sample, wherein the crack has a desired width by using a blade having a specific thickness.
5. The production method according to claim 1, characterized in that: the cutting tool further comprises a depth control rod arranged on the support or the cutting mechanism, and a positioning end capable of being abutted against the bottom plate is arranged on the lower end portion of the depth control rod.
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| CN113607465B (en) * | 2021-07-23 | 2023-04-28 | 北京科技大学 | On-site rapid detection method for strength of stope filling body |
| CN113866019B (en) * | 2021-09-30 | 2024-04-09 | 建材桂林地质工程勘察院有限公司 | Direct shear test device suitable for fracture soil with variable size |
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