CN112683695B - Simple direct shearing device for root soil complex and use method - Google Patents
Simple direct shearing device for root soil complex and use method Download PDFInfo
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Abstract
The invention provides a simple direct shear device of a root soil complex and a use method thereof, comprising a shear test device, wherein the shear test device consists of an upper shear box and a lower shear box, the upper shear box is connected with a lifting moving assembly, and a gap is reserved between the upper shear box and the lower shear box, so that the space position of the upper shear box on a horizontal plane is kept fixed; the side of lower shear box is equipped with loading thrust subassembly for lower shear box forms dislocation removal relative to last shear box. According to the invention, the upper shearing box is fixed on the horizontal plane, and a certain gap is reserved between the upper shearing box and the lower shearing box, so that the accuracy of the shear strength test result of the root soil complex can be effectively improved when the upper shearing box and the lower shearing box generate relative displacement.
Description
Technical Field
The invention relates to the technical field of soil shear strength testing, in particular to a direct shear device of a root-soil complex and a use method thereof.
Background
The current method for soil fixation and slope protection by using plants is widely applied, and the research on various properties of the root soil complex is particularly important, wherein the shear strength of the root soil complex is an important control index for judging the stability of a soil layer. The root system in the root soil complex is usually from herbaceous plants, shrubs, arbor and the like, the existing test direct shear device is fixed by adopting a lower shear box, an upper shear box is contacted with the lower shear box and horizontally moves and misplaces on the upper side of the lower shear box, and the upper shear box and the lower shear box are respectively measured by a vertical displacement meter and a horizontal displacement meter, so that the normal stress can deviate in the process of applying the shear stress.
Disclosure of Invention
The invention aims to provide a direct shear device of a root-soil complex and a use method thereof, which are used for improving the data accuracy of the direct shear device for testing the shearing strength of soil.
The embodiment of the invention is realized by the following technical scheme: the simple direct shearing device of the root soil complex comprises a shearing test device, wherein the shearing test device consists of an upper shearing box and a lower shearing box, the upper shearing box is connected with a lifting moving assembly, and a gap is reserved between the upper shearing box and the lower shearing box, so that the spatial position of the upper shearing box on a horizontal plane is kept fixed; the side of lower shear box is equipped with loading thrust subassembly for lower shear box forms dislocation removal relative to last shear box.
Preferably, a cushion block is arranged in the upper shearing box or the lower shearing box.
Preferably, the lifting moving assembly further comprises a base and a bracket arranged on the base, and the lifting moving assembly is embedded into the brackets on two sides and is movably connected with the brackets.
Preferably, the upper shearing box is top-closed and is provided with vertical loading device above it, vertical loading device includes hydraulic telescoping cylinder and is used for detecting the compression displacement detector of soil sample compression volume, hydraulic telescoping cylinder fixedly connected with loading board, loading board both ends respectively with the support removes to be connected, makes hydraulic telescoping cylinder can right the upper shearing box is horizontal to be moved away after the vertical pressurization test.
Preferably, the base is fixedly provided with a positioning plate, and the cross section of the upper shearing box is the same as that of the lower shearing box.
Preferably, a measuring displacement meter is arranged beside the lower shearing box, the position of the measuring displacement meter is arranged on the opposite side of the loading thrust component, and the measuring displacement meter adopts a movable magnetic attraction type.
Preferably, a conveying member consisting of a plurality of round rollers is arranged at the bottom of the lower shearing box.
The invention provides a simple direct shear device of a root soil complex, which further comprises a sample preparation device, wherein the sample preparation device comprises a first side plate, a second side plate, a bottom plate and a cover plate, two ends of the two first side plates are respectively provided with a cross rod matched with bolts to enable the two first side plates to be fastened and connected, the cross rods are connected with connecting rods to fix the bottom plate, the inner side of the first side plate is provided with an installation clamping groove for inserting the second side plate, and the cover plate is placed into a containing cavity formed by splicing.
The application method of the simple direct shear device of the root soil complex comprises the following specific steps of:
step one, keeping the upper shearing box and the lower shearing box coincident, and putting a certain angle between a test soil sample keeping root system and a plane where a shearing joint is positioned into the lower shearing box;
moving an upper shearing box downwards to contact with the test soil sample, wherein a certain gap is reserved between the upper shearing box and the lower shearing box, and the top of the upper shearing box is subjected to constant positive stress;
step three, the loading thrust component pushes the lower shear box to move and carries out displacement detection;
and step four, the loading thrust component applies pressure step by step to enable the lower shear box to horizontally move and misplace relative to the upper shear box, and detection data are recorded.
The application method of the simple direct shear device of the root soil complex further comprises a sample preparation method, and the method comprises the following specific steps:
firstly, putting a certain amount of soil sample into a sample preparation device for paving;
step two, horizontally paving the root system on the soil sample, wherein the root system can be vertical to the first side plate or form a certain included angle with the first side plate and put into the soil sample;
continuously filling a soil sample into the soil, placing a cover plate, applying pressure to the cover plate to set the soil density, and maintaining the pressure for a certain time;
and step four, taking out the prepared test soil sample for standby.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects: compared with the prior art, the upper shearing box is horizontally fixed, and meanwhile, the lower shearing box and the upper shearing box are kept at a certain interval to form the shearing slits, so that the shearing slits are prevented from being blocked by the settlement of the sample due to the stress deflection of the positive stress born by the upper shearing box in the process of mutual dislocation movement between the shearing boxes, and the shearing detection result is prevented from being influenced by the resistance generated by the contact of the upper shearing box and the lower shearing box, and the accuracy of the shearing resistance test result is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a simple direct shear device of a root-soil complex provided in embodiment 1 of the present invention;
FIG. 2 is a top view of a simple direct shear device of the root soil complex of embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the structure of a sample preparation apparatus according to example 2 of the present invention;
FIG. 4 is a schematic diagram showing a sample preparation process in example 3 of the present invention;
FIG. 5 is a schematic diagram of the soil sample in example 3 according to the present invention, wherein the root system is inclined at a certain angle;
fig. 6 is a schematic diagram of the shear strength measurement of the earth in the present invention.
Icon: the device comprises a 1-upper shearing box, a 2-lower shearing box, a 3-loading thrust component, a 4-base, a 5-support, a 6-vertical loading device, a 61-hydraulic telescopic cylinder, a 62-bearing plate, a 7-stud supporting seat, an 8-level meter, a 9-measuring displacement meter, a 10-positioning plate, a 11-round roller, a 12-first side plate, a 13-second side plate, a 14-bottom plate, a 15-cover plate, a 16-mounting clamping groove, a 17-connecting rod, a 18-cross rod, a 19-lifting moving component, a 20-cushion block and a 21-compression displacement detector.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-2, embodiment 1 is a simple direct shear device of a root soil complex, comprising a shear test device, wherein the shear test device comprises an upper shear box 1 and a lower shear box 2, the upper shear box 1 is connected with a lifting moving assembly 19, and a gap is reserved between the upper shear box 1 and the lower shear box 2, so that the spatial position of the upper shear box 1 on a horizontal plane is kept fixed; the side of the lower shear box 2 is provided with the loading thrust component 3, so that the lower shear box 2 moves in a staggered manner relative to the upper shear box 1, the upper shear box 1 is fixed in space position on the horizontal plane, meanwhile, the upper shear box 1 can move up and down through the lifting moving component 19 to conveniently put a replaced test soil sample into the lower shear box 2, the test soil sample loading device also has the function of adjusting the interval distance between the upper shear box 1 and the lower shear box 2, the loading thrust component 3 horizontally applies pressure to enable the lower shear box 2 and the upper shear box 1 to form relative staggered movement, and a shear seam which keeps a gap of 1cm when the upper shear box 1 and the lower shear box 2 are tested is used for avoiding soil settlement and contact to generate resistance to influence a detection result, if the shear seam is not arranged between the upper shear box 1 and the lower shear box 2, after the vertical load is applied, the upper shear box 1 and the lower shear box 2 can be attached together due to overlarge vertical compression deformation of the soil body, if the test soil sample loading is attached together, the test soil sample loading device can generate two problems, one positive stress part can be applied to the upper shear box 1, and the other shear box 1 can generate accurate shear force in the shear section.
As shown in fig. 1, the upper shearing box 1 or the lower shearing box 2 is provided with the cushion blocks 20, and by arranging a plurality of groups of cushion blocks 20 with different thicknesses, the proper cushion blocks 20 with different thicknesses can be selected to be placed at the bottom and the upper part of a test soil sample according to the compressive change of the normal stress applied to the upper shearing box 1, and the shearing joint is always reserved between the upper shearing box 1 and the lower shearing box 2 by matching with the compressed soil sample height, so that the final result of the shear strength test experiment is not influenced by the phenomenon of stress concentration and the like in the experimental process.
Still include base 4 and install support 5 on base 4, lift remove the subassembly 19 imbeds in the support 5 of both sides and remove with it to be connected, conveniently go up shearing box 1 through lift remove the subassembly 19 and can reciprocate and horizontal migration in the upside of shearing box 2 down, and then change and put into test soil sample, can be further be connected with the below of base 4 simultaneously and be used for adjusting its horizontally double-screw bolt supporting seat 7, and its week side is equipped with the spirit level 8 that is used for observing, the horizontal regulation to base 4 is realized to the level that the accessible double-screw bolt supporting seat 7 combines the level, and then shearing box 2 is put and is tested on horizontal base 4 down and has avoided the gravity of shearing box 2 down to the influence of detection.
The upper shear box 1 is top-sealed and is provided with a vertical loading device 6 above the vertical loading device 6, the vertical loading device 6 comprises a hydraulic telescopic cylinder 61 and a compression displacement detector 21 for detecting the compression amount of a soil sample, the compression displacement detector 21 is arranged on a telescopic pressing plate of the vertical loading device 6, the compression displacement detector 21 detects the downward displacement amount of the pressing plate in contact with the upper shear box 1 so as to obtain the compression amount of the soil sample pressed downwards, and a proper cushion block 20 is conveniently selected and put into the shear box, the hydraulic telescopic cylinder 61 is fixedly connected with a bearing plate 62, two ends of the bearing plate 62 are respectively movably connected with a bracket 5, so that the hydraulic telescopic cylinder 61 can horizontally move away after vertically pressing the upper shear box 1, compared with the upper shear box 1 with an unsealed structure, when the upper shear box 1 is loaded with a vertical load, the cushion block 20 is subjected to pressure downward movement, the test soil body is clung to the inner wall of the upper shear box 1 at the moment, after the vertical load is subjected to the vertical load, the soil body is clung to the inner wall of the upper shear box 1 along the horizontal expansion due to the poisson effect, the soil body is bound to the inner wall of the upper shear box, the friction force is necessarily generated between the soil body and the inner wall (and the vertical damage part can be adhered to the inner wall), the vertical friction force is possibly damaged part is greatly influenced, the soil body is not to be equal to the accurate friction force is calculated, and the upper shear box 1 is difficult to the vertical load is not stressed by the vertical load, and the vertical load is not influenced by the vertical load, and the vertical load is not is stressed on the upper shear box 1, and is more than the whole is calculated, and is difficult to the vertical load, and has the vertical load is not has the impact force is stressed and has the impact on the vertical load and a normal load and a load and has a small load and a load. The positive stress on the shear plane can be calculated more accurately.
The base 4 is fixedly provided with the locating plate 10, the cross section size of the upper shearing box 1 is the same as that of the lower shearing box 2, after one shear strength test is completed, the lower shearing box 2 is required to be taken out to clean soil in the lower shearing box, meanwhile, the upper shearing box 1 is lifted, residual soil samples in the lower shearing box fall off, after the cleaning is completed, the lower shearing box 2 is put back and contacted with the locating plate 10, the vertical contact ratio between the upper shearing box and the lower shearing box is ensured, and the next shear strength test experiment is conveniently implemented.
The side of the lower shear box 2 is provided with a measuring displacement meter 9, the position of the measuring displacement meter 9 is arranged on the opposite side of the loading thrust component 3, the measuring displacement meter 9 adopts movable magnetic attraction, the loading thrust component 3 pushes the lower shear box 2 to generate displacement, the measuring displacement meter 9 can effectively detect the moving distance of the measuring displacement meter on the opposite side of the lower shear box, and after one shear strength test is finished, residual soil samples in the shear box are required to be cleaned for multiple tests respectively, so that the measuring displacement meter 9 is convenient to remove and adjust the position.
The bottom of the lower shearing box 2 is provided with a conveying member composed of a plurality of round rollers 11, so that the influence on the detection result caused by the contact of the lower shearing box 2 and the base 4 is reduced, and further, the fact that the resistance of the lower shearing box 2 pushed by the loading thrust component 3 is provided by the test soil sample of the root soil complex is ensured, and meanwhile, the width of the round rollers 11 is larger than the outline dimension of the lower shearing box 2.
It should be noted that, because the soil body has different properties, the vertical deformation of different soil bodies is uncertain, so a certain method is needed to control the height of the shearing seam, this experiment is to study the stress on the shearing surface of the soil complex, therefore, the direct shearing device is equipped with the cushion blocks 20 with the length and width slightly smaller than the size of the shearing box and different thickness, before the experiment begins, the soil body settlement height under the normal stress of each stage is determined by pre-experiment, thus determining the thickness of the cushion block 20 needed by the normal stress of each stage, so that when the formal experiment is carried out, the cushion block 20 is put into the shearing box first, then the soil sample is put into the soil sample for testing, at this time, the shearing seam is very high, but after the vertical load is applied to the top of the upper shearing box 1, the shearing seam is gradually reduced to the preset height, but when the experiment is finished, the upper shearing box 1 and the lower shearing box 2 are not contacted, and the thickness of the cushion block 20 selected to be put into the shearing box is determined by detecting the vertical deformation height after the normal stress is applied to the upper shearing box 1 by the vertical loading device 6.
Referring to fig. 3, fig. 4 and fig. 5, a simple direct shear device of root soil complex still includes sample preparation device, sample preparation device includes first curb plate 12, second curb plate 13, bottom plate 14 and apron 15, two first curb plate 12 both ends all are provided with horizontal pole 18 and make both fastening link to each other with the bolt, horizontal pole 18 is connected with connecting rod 17 and is used for fixed bottom plate 14, first curb plate 12 inboard is provided with and is used for second curb plate 13 male installation draw-in groove 16, apron 15 is put into the holding chamber of concatenation constitution, the required soil sample of test of preparation through the device is continuous, simple easy operation.
Example 2
Referring to fig. 1 and 2, embodiment 2 is a method for using a simple direct shear device based on a root soil complex in embodiment 1, including a method for testing a direct shear device, which specifically includes the following steps:
the method comprises the steps that firstly, an upper shearing box 1 and a lower shearing box 2 are kept coincident, and a certain angle is formed between a test soil sample keeping root system and a plane where a shearing joint is located and is placed in the lower shearing box 1; when the root soil complex landslide in the outdoor environment can be simulated to the greatest extent through the test mode, the shearing stress process between soil and root system is realized, the result of the shearing strength test is also more beneficial to obtaining the effect of soil fixation and slope protection of different plant roots, and meanwhile, the cushion blocks 20 with different thicknesses can be selected according to the different loads applied to the top of the upper shearing box 1 and placed into the shearing box.
Step two, moving the upper shearing box 1 downwards to contact with the test soil sample, keeping a certain gap between the upper shearing box 1 and the lower shearing box 2, and enabling the top of the upper shearing box 1 to be subjected to constant positive stress; the vertical loading device 6 is fully contacted with the top of the upper shearing box 1 to apply pressure, the upper shearing box 1 connected with the lifting moving assembly 19 and the test soil sample integrally move downwards, the size of a shearing seam is controlled, and the normal stress of the vertical loading device 6 is prevented from being distributed on the friction force between the soil body and the inner wall of the upper shearing box 1.
Step three, the loading thrust component 3 pushes the lower shear box 2 to move and carries out displacement detection; during the constant positive stress to the upper shear box 1, the loading thrust assembly 3 horizontally contacts the outer surface of the lower shear box 2 to apply force thereto, and at the same time, the distance of horizontal displacement needs to be controlled to detect the data about the maximum shear strength of the root complex.
And step four, the loading thrust component 3 applies pressure step by step to enable the lower shear box 2 to horizontally move and misplace relative to the upper shear box 1, detection data are recorded, after residual soil samples are cleaned, soil sample replacement is carried out, next test work is carried out, the steps are repeated for a plurality of times, and the shear strength of the soil sample is calculated after data analysis is carried out.
Referring to fig. 6, the graph is a schematic diagram of measuring shear strength parameters of soil, a vertical loading device 6 on the upper side of an upper shear box 1 is used for changing vertical normal stress, a normal stress sigma is fixed in each test, the shear strength tau is obtained after the soil body is sheared and destroyed, a set of experimental data (sigma, tau) is obtained in each test, the shear test is repeated, the magnitude of the normal stress on the shear surface is changed, a plurality of groups of experimental data can be obtained, and experimental data points can be fitted in the graph mode to obtain a coulomb equation (linear equation), so that two parameters (c, phi) representing the shear strength of the soil body correspond to the intercept and the slope shown in the graph, and the intercept and the slope correspond to cohesive force and internal friction angle of the shear strength of a root soil complex respectively.
Example 3
Referring to fig. 4-5, embodiment 3 is a method for using a simple direct shear device based on a root soil complex in embodiment 1, and further includes a sample preparation method, which specifically includes the following steps:
firstly, putting a certain amount of soil sample into a sample preparation device for paving; the soil-packing operation is carried out in the sample preparation device, so that the soil can be fully contacted and wrapped after the root system is placed.
Step two, horizontally paving the root system on the soil sample, wherein the root system can be vertical to the first side plate 12 or form a certain included angle with the first side plate and put into the soil sample; traditional system appearance process adopts drum formula preparation mould, vertically puts into the section of thick bamboo with the root system and exert pressure above it with soil sample tamp compress tightly, extremely damages the natural laminating state of root system structure and soil sample easily, thereby put into rectangular sample preparation device with the root system through the level and just keep the level pressure test thereby prevent to press the in-process of soil sample to cause damage to the root system and more conveniently adjust the distribution condition of root system for the root system both can be perpendicular with the shear plane also can become certain contained angle setting with it, is favorable to testing the influence of different buried root modes to root soil complex shear strength.
Continuously filling the soil sample into the soil, placing the cover plate 15, applying pressure to the cover plate 15 to set soil density, and maintaining the pressure for a certain time; the pressure is maintained for more than 30 minutes to prevent the soil from rebounding, and the cover plate 15 is flush with the setting state of the root system relative to the root system.
And step four, taking out the prepared test soil sample for standby, wherein the prepared soil sample is cuboid, and compared with the traditional cylindrical soil sample, the prepared soil sample is better combined with soil, so that the shear strength accuracy of the root soil complex is ensured, repeated test records are carried out on the soil sample which needs to be subjected to soil fixation and slope protection and a plurality of root soil complexes prepared and processed by a plant root system, and the data are compared and analyzed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a simple and easy direct shear device of root soil complex, includes shear test device, shear test device comprises upper shearing box (1) and lower shearing box (2), its characterized in that:
the upper shearing box (1) is connected with a lifting moving assembly (19), and a gap is reserved between the upper shearing box (1) and the lower shearing box (2), so that the space position of the upper shearing box (1) on a horizontal plane is kept fixed;
a loading thrust component (3) is arranged at the side of the lower shearing box (2) so that the lower shearing box (2) moves in a dislocation manner relative to the upper shearing box (1);
a cushion block (20) is arranged in the upper shearing box (1) or the lower shearing box (2);
the lifting moving assembly (19) is embedded into the brackets (5) on two sides and is movably connected with the brackets;
the utility model discloses a soil sample compression device, including upper shearing box (1), support (5) and support, upper shearing box (1) is closed at top and its top is provided with vertical loading device (6), vertical loading device (6) are including hydraulic telescoping cylinder (61) and be used for detecting compression displacement detector (21) of soil sample compression volume, hydraulic telescoping cylinder (61) fixedly connected with loading board (62), loading board (62) both ends respectively with support (5) remove for hydraulic telescoping cylinder (61) can be right upper shearing box (1) vertical pressurized test back level is moved away.
2. The simple direct shear device of a root soil complex of claim 1, wherein: the base (4) is fixedly provided with a positioning plate (10), and the cross section of the upper shearing box (1) is the same as the cross section of the lower shearing box (2).
3. The simple direct shear device of a root soil complex of claim 1, wherein: the side of the lower shearing box (2) is provided with a measuring displacement meter (9), the position of the measuring displacement meter is arranged on the opposite side of the loading thrust component (3), and the measuring displacement meter (9) adopts movable magnetic attraction.
4. The simple direct shear device of a root soil complex of claim 1, wherein: the bottom of the lower shearing box (2) is provided with a conveying component consisting of a plurality of round rollers (11).
5. The simple direct shear device of a root soil complex of claim 1, wherein: still include sample preparation facilities, sample preparation facilities includes first curb plate (12), second curb plate (13), bottom plate (14) and apron (15), and two first curb plate (12) both ends all are provided with horizontal pole (18) cooperation bolt and make both fastening link to each other, horizontal pole (18) are connected with connecting rod (17) and are used for fixed bottom plate (14), first curb plate (12) inboard be provided with be used for second curb plate (13) male installation draw-in groove (16), in the accommodation chamber that the concatenation was constituteed is put into to apron (15).
6. A method for using a simple direct shear device based on the root soil complex of any one of claims 1-5, characterized in that: the method comprises the following specific steps:
step one, keeping the upper shearing box (1) and the lower shearing box (2) coincident, and putting a certain angle between a test soil sample keeping root system and a plane where a shearing joint is positioned into the lower shearing box (2);
step two, moving an upper shearing box (1) downwards to contact with a test soil sample, wherein a certain gap is reserved between the upper shearing box (1) and the lower shearing box (2), and the top of the upper shearing box (1) is subjected to constant normal stress;
step three, the loading thrust component (3) pushes the lower shear box (2) to move and perform displacement detection;
and step four, the loading thrust component (3) applies pressure step by step so that the lower shearing box (2) moves horizontally and misplaces relative to the upper shearing box (1), and detection data are recorded.
7. A method for using the simple direct shear device based on the root soil complex of claim 6, which is characterized in that: the method for preparing the sample comprises the following specific steps:
firstly, putting a certain amount of soil sample into a sample preparation device for paving;
step two, horizontally paving the root system on the soil sample, wherein the root system can be vertical to the first side plate (12) or form a certain included angle with the first side plate and put into the soil sample;
continuously filling a soil sample into the soil, placing a cover plate (15), applying pressure to the cover plate (15) to set the soil density, and maintaining the pressure for a certain time;
and step four, taking out the prepared test soil sample for standby.
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| CN114136808B (en) * | 2021-11-12 | 2023-12-01 | 青岛理工大学 | Equipment for measuring direct shear friction characteristics of soil interface |
| CN114659908B (en) * | 2022-03-28 | 2023-03-24 | 中国矿业大学 | Multidirectional free shearing experiment system and method for rock structural surface |
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