Determination method and test device for angle of repose of cohesionless soil

Abstract

The present invention relates to the field of geotechnical engineering testing technology, and specifically to a method and a testing device for measuring the angle of repose of cohesionless soil. The method for measuring the angle of repose of cohesionless soil comprises adjusting a leveling component so that a base is in a horizontal state; placing a sample container on the base, with the bottom of the sample container being open and arranged opposite to the top surface of the base; placing a cohesionless soil sample of preset weight and preset volume in the sample container; lifting the sample container upward, so that the cohesionless soil sample flows out of the sample container through the opening and forms a conical accumulation body on the base; obtaining the weight of the accumulation body; and calculating the angle of repose of the cohesionless soil sample based on the weight of the accumulation body, the preset weight and preset volume of the cohesionless soil sample, and the radius of the bottom surface of the accumulation body. The method for measuring the angle of repose of cohesionless soil proposed by the present invention can improve the measurement accuracy of the angle of repose.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering testing, and in particular to a method and a testing device for measuring the angle of repose of cohesionless soil. Background Art

[0002] The angle of repose is an important parameter for calculating the stability of non-cohesion soil slopes. Sometimes, when the internal friction angle data is difficult to obtain, the angle of repose is selected as a design parameter. In the related art, the indoor measurement methods of the angle of repose are mainly the funnel method, the cylinder rotation method and the discharge method. During the test, the angle of repose is calculated by directly measuring the angle between the main line of the pile and the horizontal line, or by directly measuring the height and bottom radius of the pile. For the funnel method, the impact of falling particles will cause the top of the pile to be cut off. In addition, when the test soil is coarse-grained soil, when using the above method to test, the main line of the pile may not be a straight line due to excessive or insufficient slippage of the particles, or the pile may be cut off due to excessive slippage of the particles, which may lead to a large measurement error in the calculated angle of repose. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a method for measuring the angle of repose of cohesionless soil, which can improve the measurement accuracy of the angle of repose.

[0004] An embodiment of the present invention further provides a device for testing the angle of repose of cohesionless soil.

[0005] The method for measuring the angle of repose of cohesionless soil according to an embodiment of the present invention comprises:

[0006] Adjust the leveling assembly to make the base level;

[0007] placing a sample container on the base, wherein the bottom of the sample container is open and arranged opposite to the top surface of the base;

[0008] placing a cohesionless soil sample of a preset weight and a preset volume in the sample container;

[0009] The sample container is lifted upward, and the cohesionless soil sample flows out of the sample container through the opening and forms a conical accumulation on the base;

[0010] Obtaining the weight of the stack;

[0011] The angle of repose of the cohesionless soil sample is calculated based on the weight of the pile, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the pile, and the angle of repose is: Where θ represents the angle of repose, M i Indicates the preset weight of the cohesionless soil sample, Vi Indicates the preset volume of the cohesionless soil sample, M l represents the weight of the pile, and r represents the radius of the bottom surface of the pile.

[0012] The method for measuring the angle of repose of cohesionless soil according to the embodiment of the present invention can improve the measurement accuracy of the angle of repose of cohesionless soil.

[0013] In some embodiments, a weight sensor is used to detect the weight of the pile.

[0014] In some embodiments, a cohesionless soil sample of a preset weight and volume is placed in the sample container in a layered manner. If the dry density of the cohesionless soil sample is greater than the preset dry density, the cohesionless soil sample is compacted.

[0015] In some embodiments, if the dry density of the cohesionless soil sample is greater than a preset dry density, the step of lifting the sample container upward includes:

[0016] Enlarging the radius of the sample container;

[0017] Lift the adjusted sample container upwards.

[0018] In some embodiments, the sample container is divided into a first part and a second part, the first part and the second part are arranged opposite to each other in a radial direction of the sample container, and the first part is detachably connected to the second part.

[0019] The increasing the radius of the sample container includes separating the first portion and the second portion so that the first portion and the second portion are spaced apart in the radial direction.

[0020] The device for testing the angle of repose of cohesionless soil according to an embodiment of the present invention comprises:

[0021] base;

[0022] A leveling assembly connected to the base, the leveling assembly being used to adjust the base so that the base is in a horizontal state;

[0023] a sample container having an opening at the bottom thereof, the opening of the sample container being arranged opposite to an end of the base away from the leveling assembly, the sample container being movable relative to the base in a direction away from the base so as to have a first position and a second position; in the first position, the sample container is in contact with the base and the sample container and the base define a sample space, the sample space being suitable for accommodating a non-cohesive soil sample of a preset weight and volume; and in the second position, the sample container is spaced apart from the base so that the non-cohesive soil sample forms a conical accumulation on the base after flowing out of the sample container through the opening;

[0024] A weight sensor is used to measure the weight of the pile to calculate the angle of repose of the cohesionless soil sample based on the weight of the pile, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the pile.

[0025] The device for testing the angle of repose of cohesionless soil according to the embodiment of the present invention can improve the measurement accuracy of the angle of repose of cohesionless soil.

[0026] In some embodiments, the sample container includes a first part and a second part, the first part and the second part are arranged opposite to each other in a radial direction of the sample container, and the first part is detachably connected to the second part.

[0027] In some embodiments, a first positioning pin is provided on the first portion, a first through hole is formed on the first positioning pin, and a second positioning pin corresponding to the first positioning pin is provided on the second portion, a second through hole is formed on the second positioning pin.

[0028] In some embodiments, the leveling assembly includes an adjusting member and a supporting member, one end of the supporting member is connected to the base, and the other end of the supporting member is connected to the adjusting member.

[0029] In some embodiments, the testing device for the angle of repose of cohesionless soil further includes a controller, which is connected to the weight sensor to calculate the angle of repose of the cohesionless soil sample based on the received weight of the pile, the preset weight and preset volume of the cohesionless soil sample, and the radius of the bottom surface of the pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 4 is a flow chart of a method for determining the angle of repose of cohesionless soil according to an embodiment of the present invention.

[0031] Figure 2 Schematic diagram of a device for testing the angle of repose of cohesionless soil according to an embodiment of the present invention.

[0032] Figure 3 FIG. 1 is a schematic diagram of a sample container according to an embodiment of the present invention.

[0033] Reference numerals: cohesionless soil sample 100,

[0034] Base 1, leveling component 2, adjustment member 21, support member 22,

[0035] Sample container 3, first part 31, first positioning pin 311, first through hole 3111, second part 32, second positioning pin 321, second through hole 3211,

[0036] Weight sensor 4, collector 5, wiring 6, connecting screws 7, handle 8. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] like Figure 1 As shown, the method for measuring the angle of repose of cohesionless soil in an embodiment of the present invention includes: adjusting a leveling assembly to make the base horizontal; placing a sample container on the base, with the bottom of the sample container open and arranged opposite to the top surface of the base; placing a cohesionless soil sample of a preset weight and a preset volume in the sample container; lifting the sample container upward, so that the cohesionless soil sample flows out of the sample container through the opening and forms a conical accumulation on the base; obtaining the weight of the accumulation; and calculating the angle of repose of the cohesionless soil sample based on the weight of the accumulation, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the accumulation, where the angle of repose is: Where θ represents the angle of repose, M i Indicates the preset weight of the cohesionless soil sample, V i Indicates the preset volume of the cohesionless soil sample, M l represents the weight of the pile, and r represents the radius of the bottom surface of the pile.

[0039] Specifically, in an embodiment of the present invention, the base is placed in a horizontal state through a leveling assembly, and a sample container with an open bottom is placed on the base. The sample container and the base are in contact so that the sample container and the base enclose a sample space, and a non-cohesion soil sample of a preset weight and a preset volume is placed in the sample space. By slowly lifting the sample container upward, the non-cohesion soil sample flows out of the sample container through the opening at the bottom of the sample container and forms a conical accumulation body on the base. The repose angle of the non-cohesion soil is calculated by measuring the weight of the accumulation body on the base, the preset weight and preset volume of the non-cohesion soil sample, and the radius of the bottom surface of the accumulation body.

[0040] The steps for calculating the angle of repose of cohesionless soil include: calculating the volume of the pile based on the preset weight and preset volume of the cohesionless soil sample; calculating the height of the pile based on the volume of the pile and the radius of the bottom surface of the pile; and calculating the angle of repose based on the height of the pile and the radius of the bottom surface of the pile.

[0041] It should be noted that the method for determining the angle of repose of cohesionless soils according to the embodiments of the present invention can be applied to measuring the angle of repose of cohesionless soils, such as coarse-grained soils or sandy soils. Measurements can be performed directly in the laboratory or on-site. The cohesionless soil sample can be air-dried or unsaturated. As long as the ratio of the maximum particle size of the container to the cohesionless soil sample is 5, there is no restriction on the maximum particle size of the soil material. This allows for on-site angle of repose testing of prototype coarse cohesionless soils, avoiding angle of repose measurement errors caused by the size effect of coarse-grained soils.

[0042] The embodiment of the present invention calculates the volume and height of the pile and then calculates the angle of repose of non-cohesion soil. During the measurement process, the weight of the pile is measured instead of the method of measuring the busbar or height of the pile in the related art, thereby improving the test accuracy of the angle of repose of non-cohesion soil.

[0043] It can be understood that in the method for measuring cohesionless soil in the embodiment of the present invention, the shape of the deposit is set to be conical, and the calculated angle of repose of the cohesionless soil is the average angle of repose of the deposit.

[0044] Compared with the related art in which the busbar of the pile is directly measured, the busbar measurement is inaccurate due to the outward convex or concave cone surface of the pile, and the related art in which the height of the pile is directly measured, the pile height measurement is inaccurate due to the clipping phenomenon of the pile, that is, the clipping phenomenon caused by impact and the defect that the busbar of the coarse-grained soil pile is not a straight line, which leads to inaccurate measurement of the angle of repose. The method for measuring the angle of repose of non-cohesion soil in an embodiment of the present invention first calculates the volume of the pile for a non-cohesion soil sample of preset weight and preset volume and the weight of the pile, then calculates the height of the pile based on the volume of the pile, and finally calculates the angle of repose of the pile based on the height and volume of the pile and the radius of the bottom surface of the pile, thereby avoiding the measurement of the busbar and height of the pile and improving the measurement accuracy.

[0045] The embodiment of the present invention can quickly calculate the angle of repose of cohesionless soil by measuring the weight of the pile and the bottom radius of the pile, thereby improving the measurement efficiency of the angle of repose of cohesionless soil.

[0046] In some embodiments, a weight sensor is used to detect the weight of the pile.

[0047] Specifically, the embodiment of the present invention measures the weight of the pile by a weight sensor, and then calculates the angle of repose of the cohesionless soil by calculation, thereby avoiding the measurement error caused by measuring the busbar or height of the pile by manual measurement in the related art, and improving the measurement accuracy of the angle of repose of the cohesionless soil.

[0048] For example, a collector can also be set up, and the collector is connected to a weight sensor. After the weight of the pile is directly measured by the weight sensor and the weight of the pile is displayed by the collector, the angle of repose of the cohesionless soil can be calculated manually or by setting a controller to receive the preset weight and preset volume of the cohesionless soil sample, the weight sensor and the data of the bottom radius of the pile.

[0049] For example, the weight sensor can be a screw tension and compression sensor. The weight sensor is arranged at the lower end of the base and can directly measure the weight of the pile.

[0050] In some embodiments, a cohesionless soil sample of a preset weight and volume is placed in a sample container in a layered manner. If the dry density of the cohesionless soil sample is greater than the preset dry density, the cohesionless soil sample is compacted.

[0051] Specifically, the layered placement method is combined with compaction, that is, the compaction of the non-cohesion soil sample can be carried out by placing one layer in layers and then compacting one layer, and then placing another layer and compacting it again, so as to improve the placement uniformity of the non-cohesion soil sample in the sample container.

[0052] For example, the preset dry density is a preset value, and different preset dry densities can be determined according to different cohesionless soil samples, or can be set as a fixed value.

[0053] For example, if the sample height of a cohesionless soil sample is 20 cm and it is loaded in four layers, each layer is 5 cm. For soils with a lower dry density, compaction is not required. For soils with a higher dry density (i.e., greater than the preset dry density), if the loaded height exceeds 5 cm, compaction is required to ensure that the height of the layer is equal to 5 cm.

[0054] In some embodiments, if the dry density of the cohesionless soil sample is greater than a preset dry density, the step of lifting the sample container upward includes: increasing the radius of the sample container; and lifting the adjusted sample container upward.

[0055] Specifically, if the dry density of the non-cohesive soil sample is greater than the preset dry density, the non-cohesive soil sample is likely to move with the sample container as the sample container is lifted upward. After increasing the radius of the sample container, the adjusted sample container is lifted upward.

[0056] The embodiment of the present invention adjusts the radius of the sample container to avoid the phenomenon that the non-cohesive soil sample moves along with the sample container when it is lifted upward, ensuring that as the sample container is lifted upward, the non-cohesive soil sample flows out of the opening of the sample container and forms an accumulation on the base.

[0057] In some embodiments, the sample container is divided into a first part and a second part, the first part and the second part are arranged opposite to each other in the radial direction of the sample container, and the first part is detachably connected to the second part. When the radius of the sample container is increased, it includes separating the first part and the second part so that the first part and the second part are spaced apart in the radial direction.

[0058] Specifically, when the radius of the sample container is increased, the gap between the non-cohesive soil sample and the inner wall of the sample container is increased by separating the first and second parts of the sample container in the radial direction, and the friction is reduced, thereby facilitating the non-cohesive soil sample to flow out of the bottom opening of the sample container.

[0059] The apparatus for testing the angle of repose of cohesionless soil according to an embodiment of the present invention comprises: a base 1, a leveling assembly 2, a sample container 3, and a weight sensor 4. The leveling assembly 2 is connected to the base 1 and is used to adjust the base 1 to a horizontal position. The sample container 3 has an opening at the bottom, and the opening (not shown) of the sample container 3 is arranged opposite the end of the base 1 away from the leveling assembly 2. The sample container 3 is movable relative to the base 1 in a direction away from the base 1 so that the sample container 3 has a first position and a second position. In the first position, the sample container 3 contacts the base 1 and the sample container 3 and the base 1 define a sample space suitable for accommodating a cohesionless soil sample 100 of a preset weight and volume. In the second position, the sample container 3 is spaced apart from the base 1 so that the cohesionless soil sample 100 flows out of the sample container 3 through the opening and forms a conical deposit on the base 1. The weight sensor 4 is used to measure the weight of the deposit to calculate the angle of repose of the cohesionless soil sample 100 based on the weight of the deposit, the preset weight and volume of the cohesionless soil sample 100, and the radius of the bottom surface of the deposit.

[0060] Specifically, if Figure 2 As shown, a leveling assembly 2 is disposed below the base 1 to support and adjust the base 1 to a horizontal position. The bottom, i.e., lower end, of the sample container 3 is open, and the lower end of the sample container 3 is arranged opposite the upper end of the base 1. The sample container 3 can be placed on the base 1, with the lower end of the sample container 3 contacting the upper end of the base 1 to form a sample space. When the sample container 3 is slowly lifted upward, the sample container 3 is separated from the base 1, i.e., the lower end of the sample container 3 no longer contacts the upper end of the base 1. The cohesiveless soil sample 100 in the sample space flows out of the sample container 3 through the bottom opening of the sample container 3 and forms a deposit on the base 1. A weight sensor 4 is connected to the base 1 to measure the weight of the deposit on the base 1.

[0061] For example, the testing device further includes a collector 5 , which is connected to the weight sensor 4 via a connection 6 to receive and display the weight of the pile measured by the weight sensor 4 .

[0062] For example, a level meter (not shown in the figure) is further provided on the base 1 , and the base 1 is leveled by the leveling assembly 2 , and the horizontal state of the base 1 is determined by the level meter.

[0063] For example, the weight sensor 4 can be a screw tension and compression sensor. The weight sensor 4 is arranged at the lower end of the base 1 and can directly measure the weight of the stack.

[0064] For example, the base, frequency modulation component, sample container and weight sensor in the measuring device are all detachably connected and assembled, which facilitates the transportation, loading and unloading and relocation of the measuring device. It is suitable not only for use in the laboratory, but also for use on site.

[0065] It can be understood that the testing device of the embodiment of the present invention has no restriction on the maximum particle size of the non-cohesion soil sample as long as the ratio of the sample container diameter to the maximum particle size of the non-cohesion soil sample is greater than 5. By adjusting the radius of the sample container and the base, the repose angles of different non-cohesion soil samples can be tested.

[0066] It should be noted that the contact between the sample container 3 and the base 1 can be direct contact or indirect contact. Indirect contact means that other structures, such as a gasket, can be provided between the sample container 3 and the base 1 .

[0067] The device for testing the angle of repose of cohesionless soil in an embodiment of the present invention is configured by arranging a leveling assembly 2 and a weight sensor 4 at the lower end of a base 1, placing a sample container 3 on the base 1, and placing a cohesionless soil sample 100 in a sample space enclosed by the sample container 3 and the base 1. The weight sensor 4 measures the weight of a pile formed by the cohesionless soil sample 100 on the base 1, and calculates the angle of repose of the cohesionless soil sample 100 based on the weight of the pile, a preset weight and a preset volume of the cohesionless soil sample 100, and the radius of the bottom surface of the pile, thereby improving the measurement accuracy of the device for testing the angle of repose of cohesionless soil.

[0068] In some embodiments, the sample container 3 includes a first portion 31 and a second portion 32 . The first portion 31 and the second portion 32 are arranged opposite to each other in a radial direction of the sample container 3 , and the first portion 31 and the second portion 32 are detachably connected.

[0069] Specifically, if Figure 3As shown, the first part 31 and the second part 32 are arranged relative to each other in the radial direction of the sample container 3, that is, the first part 31 and the second part 32 are arranged relative to each other in the left-right direction. The detachable connection between the first part 31 and the second part 32 realizes the connection and disassembly of the first part 31 and the second part 32, which is convenient for lifting the sample container 3 upward. At the same time, the detachable setting is convenient for transportation.

[0070] For example, the material of the sample container 3 is stainless steel, and the sample container 3 is cylindrical or cubic.

[0071] For example, the testing device further includes a connecting screw 7 , and the radius of the sample container 3 can be increased by loosening the connecting screw 7 .

[0072] In some embodiments, a first positioning pin 311 is provided on the first portion 31 , a first through hole 3111 is opened on the first positioning pin 311 , and a second positioning pin 321 corresponding to the first positioning pin 311 is provided on the second portion 32 , a second through hole 3211 is opened on the second positioning pin 321 .

[0073] Specifically, the connecting screw 7 passes through the first through hole 3111 and the second through hole 3211 in sequence to connect the first part 31 and the second part 32. By tightening the connecting screw 7, the first part 31 and the second part 32 are tightly connected to prevent the non-cohesive soil sample 100 from flowing out from the connection between the first part 31 and the second part 32.

[0074] For example, the number of the first positioning pins 311 is set to be multiple, and the number of the first positioning pins 311 is determined according to the height of the sample container 3 . Accordingly, the number of the second positioning pins 321 is also set to be multiple, and the number of the second positioning pins 321 is the same as the number of the first positioning pins 311 .

[0075] In some embodiments, the leveling assembly 2 includes an adjusting member 21 and a supporting member 22 , one end of the supporting member 22 is connected to the base 1 , and the other end of the supporting member 22 is connected to the adjusting member 21 .

[0076] Specifically, the adjusting member 21 is connected to the supporting member 22 , the upper end of the supporting member 22 is connected to the base 1 , and the lower end of the supporting member 22 is connected to the adjusting member 21 , and the base 1 is kept in a horizontal state by adjustment of the adjusting member 21 .

[0077] For example, the number of the leveling components 2 is set to three, one of which is located at the center of the base 1 , and the other two leveling components 2 are symmetrically arranged on both sides of the one adjustment component.

[0078] For example, the adjusting member 21 is a connecting pin.

[0079] In some embodiments, the testing device for the angle of repose of cohesionless soil further includes a controller (not shown in the figure), which is connected to the weight sensor 4 to calculate the angle of repose of the cohesionless soil sample 100 based on the received weight of the pile, the preset weight and preset volume of the cohesionless soil sample 100, and the radius of the bottom surface of the pile.

[0080] In the embodiment of the present invention, the controller receives the preset weight and volume of the cohesionless soil sample 100, the weight sensor 4, and the data of the bottom radius of the accumulation body to calculate the angle of repose of the cohesionless soil, thereby improving the efficiency of the angle of repose calculation.

[0081] For example, handles 8 are symmetrically provided on the sample container 3, and the sample container 3 can be easily lifted upwards by the provision of the handles 8. When the sample container 3 is lifted upwards, the sample container 3 can also be lifted by a gantry.

[0082] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0084] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0085] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0086] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0087] It is understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for determining the angle of repose of cohesionless soil, characterized in that: include: Adjust the leveling assembly to make the base level; placing a sample container on the base, wherein the bottom of the sample container is open and arranged opposite to the top surface of the base; placing a cohesionless soil sample of a preset weight and a preset volume in the sample container; The sample container is lifted upward, and the cohesionless soil sample flows out of the sample container through the opening and forms a conical accumulation on the base; Obtaining the weight of the stack; The angle of repose of the cohesionless soil sample is calculated based on the weight of the pile, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the pile, and the angle of repose is: Where θ represents the angle of repose, M i Indicates the preset weight of the cohesionless soil sample, V i Indicates the preset volume of the cohesionless soil sample, M l represents the weight of the pile, and r represents the radius of the bottom surface of the pile.

2. The method for measuring the angle of repose of cohesionless soil according to claim 1, wherein: The weight of the pile is detected by a weight sensor.

3. The method for measuring the angle of repose of cohesionless soil according to claim 1, wherein: A cohesionless soil sample of preset weight and preset volume is placed in the sample container in a layered manner. If the dry density of the cohesionless soil sample is greater than the preset dry density, the cohesionless soil sample is compacted.

4. The method for measuring the angle of repose of cohesionless soil according to claim 3, wherein: If the dry density of the cohesionless soil sample is greater than a preset dry density, the step of lifting the sample container upwards comprises: Enlarging the radius of the sample container; Lift the adjusted sample container upwards.

5. The method for measuring the angle of repose of cohesionless soil according to claim 4, wherein: The sample container is divided into a first part and a second part, the first part and the second part are arranged opposite to each other in a radial direction of the sample container, and the first part is detachably connected to the second part. The increasing the radius of the sample container includes separating the first portion and the second portion so that the first portion and the second portion are spaced apart in the radial direction.

6. A device for testing the angle of repose of non-cohesive soil, characterized in that: include: base; A leveling assembly connected to the base, the leveling assembly being used to adjust the base so that the base is in a horizontal state; a sample container having an opening at the bottom thereof, the opening of the sample container being arranged opposite to an end of the base away from the leveling assembly, the sample container being movable relative to the base in a direction away from the base so as to have a first position and a second position; in the first position, the sample container is in contact with the base and the sample container and the base define a sample space, the sample space being suitable for accommodating a non-cohesive soil sample of a preset weight and volume; and in the second position, the sample container is spaced apart from the base so that the non-cohesive soil sample forms a conical accumulation on the base after flowing out of the sample container through the opening; A weight sensor is used to measure the weight of the pile to calculate the angle of repose of the cohesionless soil sample based on the weight of the pile, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the pile.

7. The device for testing the angle of repose of cohesionless soil according to claim 6, characterized in that: The sample container includes a first part and a second part, wherein the first part and the second part are arranged opposite to each other in a radial direction of the sample container, and the first part is detachably connected to the second part.

8. The device for testing the angle of repose of cohesionless soil according to claim 7, characterized in that: The first part is provided with a first positioning pin, which is provided with a first through hole. The second part is provided with a second positioning pin corresponding to the first positioning pin, which is provided with a second through hole.

9. The device for testing the angle of repose of cohesionless soil according to claim 7, characterized in that: The leveling assembly includes an adjusting member and a supporting member, one end of the supporting member is connected to the base, and the other end of the supporting member is connected to the adjusting member.

10. The device for testing the angle of repose of cohesionless soil according to claim 7, characterized in that: The device further includes a controller connected to the weight sensor to calculate the angle of repose of the cohesionless soil sample based on the received weight of the pile, the preset weight and volume of the cohesionless soil sample, and the radius of the bottom surface of the pile.

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