A kind of mixed filler and geotextile friction performance testing device

Abstract

The utility model discloses a kind of mixed filler and geotextile friction performance testing device, it is related to geotextile friction performance testing technical field, including steel frame, geotextile fixed assembly, sample box, loading assembly and monitoring component, the inside surface middle position fixed connection of geotextile fixed assembly with steel frame one side, another opening of sample box and geotextile fixed assembly abut, loading assembly and sample box side abut for applying pressure to sample box, monitoring component is set in the top of sample box for monitoring the vertical displacement of sample box. The utility model solves the difficult problem of vertical load automatic loading by the process that sample box is under the action of gravity and falls down downwards, compared with the traditional test equipment, only test fine particle sand, the utility model can also adjust sample box size to meet different gradation coarse, fine particle soil, simple operation, and measurement is accurate.

Description

Technical Field

[0001] This utility model relates to the field of geotextile friction performance testing technology, and in particular to a device for testing the friction performance of a mixed filler and geotextile. Background Technology

[0002] Geotextiles are engineering materials made from synthetic or natural fibers through weaving, needle punching, or melting. Geotextiles have a wide range of applications, with different types and uses depending on the engineering project. They are used in fields such as highway construction, water conservancy projects, and environmental protection. In slope stabilization, geotextiles enhance the tensile and shear strength of the soil, thereby increasing slope stability and playing a role in preventing landslides or collapses. This improves the safety and stability of the project, while also reducing construction and maintenance costs, leading to their widespread application and promotion.

[0003] The frictional properties between geotextiles and soil / rock are a crucial physical parameter in engineering applications. Different engineering conditions and geotextile materials can lead to varying frictional properties, directly impacting slope stability design and long-term performance. However, existing testing equipment requires complex preparation for assessing this important property, including but not limited to modifying large direct shear apparatuses to conform to specifications. This presents challenges such as cumbersome equipment operation, difficulties in applying vertical loads, complex setup of horizontal and vertical reaction mechanisms, slow testing processes, and cumbersome data processing.

[0004] Patent application CN117054326A discloses a test device and method for testing the interfacial friction parameters of geosynthetics. The test device includes a traction device, a concrete slab, a data acquisition device, and a control system. This device uses a traction device installed at the top of a sloping gravel dam and a concrete slab placed on the slope. The control system adjusts the speed of the drive motor, and a transmission structure drives a drum to wind a traction rope to pull the concrete slab. The control system receives and records the traction force transmitted by a force sensor and the displacement value transmitted by a displacement sensor. This allows for the on-site determination of the interfacial friction parameters of geosynthetics, obtaining the anti-sliding shear force and interfacial friction coefficient of the geosynthetics and structural surfaces. This provides a basis for engineering safety analysis and improves construction quality.

[0005] However, this patent requires the test equipment to be set up after the construction is completed on the construction site, and the test equipment is cumbersome to operate and the testing process is slow. Utility Model Content

[0006] This invention aims to provide a device for testing the frictional properties of mixed filler and geotextile. By utilizing the process of the sample box falling downwards under gravity, it cleverly solves the problem of automatic vertical load application. Compared with traditional testing equipment that can only test fine sand, this invention can also adjust the size of the sample box to meet the needs of coarse and fine soil with different gradations. It is simple to operate and accurate in measurement.

[0007] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0008] A device for testing the frictional properties of a mixed filler and geotextile includes a steel frame, a geotextile fixing component for fixing the geotextile, a sample box for holding a mixed filler sample, a loading component, and a monitoring component. The geotextile fixing component is fixedly connected to the middle of the inner side of one side of the steel frame. The sample box is a rectangular box with two adjacent open sides. One open side of the sample box faces upward, and the other open side of the sample box abuts against the geotextile fixing component. One end of the loading component is fixedly connected to the inner side of the steel frame away from the geotextile fixing component, and the other end of the loading component abuts against the side of the sample box away from the geotextile fixing component to apply pressure to the sample box. The monitoring component is located on the top of the sample box to monitor the vertical displacement of the sample box.

[0009] The geotextile fixing assembly includes a fixing plate and a fixing unit, with the geotextile wrapped around the outside of the fixing plate by the fixing unit.

[0010] The loading assembly includes a jack and a force transmission cylinder. The base of the jack is fixedly connected to the inner side of the steel frame away from the geotextile fixing assembly. The piston top of the jack is connected to one end of the force transmission cylinder, and the other end of the force transmission cylinder abuts against the side of the sample box away from the geotextile fixing assembly.

[0011] Steel pads are provided at both ends of the force transmission cylinder.

[0012] The loading assembly also includes a jack lifting platform for supporting the jack and the force transmission cylinder, the jack lifting platform being located at the bottom of the jack and the force transmission cylinder; a lifting pad is provided on the top of the jack lifting platform, the lifting pad being nested and connected to the jack and the force transmission cylinder respectively.

[0013] The bottom of the sample box is provided with a sample box support platform for supporting the sample box.

[0014] The sample box lifting platform is equipped with rollers at the bottom. The jack lifting platform has a hollow rectangular structure. The side of the jack lifting platform near the sample box has a notch. The sample box lifting platform is embedded in the notch and slides with the notch.

[0015] The monitoring component includes a loading beam and a sample box cover. The sample box cover is detachably connected to the top opening of the sample box. A ring is provided on the top of the sample box cover. A pull wire displacement sensor is connected to the bottom of the loading beam. The pull wire of the pull wire displacement sensor is connected to the ring. A rotary encoder is provided at the connection between the loading beam and the pull wire displacement sensor.

[0016] The sample box is provided with a first roller on the side away from the geotextile fixing component, and a second roller is provided at the bottom of the sample box.

[0017] A shock-absorbing rubber pad is installed directly below the sample box on the bottom surface of the steel frame.

[0018] The geotextile fixing assembly is connected to the steel frame via an L-shaped steel plate. One side of the L-shaped steel plate is fixedly connected to the side of the steel frame, and the other side of the L-shaped steel plate extends into the steel frame to form a cantilever plate. The geotextile fixing assembly is set on the cantilever plate.

[0019] The beneficial effects of this utility model are:

[0020] 1. This utility model has good stability and operability. The steel frame can effectively resist the stress generated during loading, ensuring the stability of the experimental environment. The sample box is a rectangular box with two adjacent open sides. One opening faces upward to facilitate filling with the mixed filler, and the other opening abuts against the geotextile fixing component, so that the mixed filler sample and the geotextile are in full contact, which facilitates the measurement and calculation of the friction coefficient between the mixed filler sample and the geotextile.

[0021] 2. In this invention, a horizontal force is applied to the reagent kit by a loading device, which clamps the reagent kit between the geotextile fixing component and the loading device. By gradually reducing the horizontal force applied to the reagent kit by the loading device, the reagent kit and the mixed filler sample move downward due to gravity. By recording the change in horizontal pressure on the sample box and the displacement in the monitoring device during the test, the friction coefficient between the mixed filler and the geotextile and the curve of the relationship between shear stress and displacement can be calculated. The operation is simple and the measurement is accurate. Attached Figure Description

[0022] Figure 1 This is a front view of the device for testing the frictional performance of the mixed filler and geotextile according to this utility model.

[0023] Figure 2 This is a top view of the device for testing the frictional properties of the mixed filler and geotextile according to this invention.

[0024] Figure 3 This is a front view of the sample box of the test device for testing the frictional properties of the mixed filler and geotextile of this utility model.

[0025] Figure 4This is a front view of the geotextile fixing component of this utility model.

[0026] Figure 5 This is a top view of the loading component of this utility model.

[0027] Figure 6 This is a front view of the monitoring device of this utility model.

[0028] The components include: 1. Steel frame; 2. Geotextile fixing assembly; 3. Sample box; 4. Loading assembly; 5. Monitoring assembly; 21. Fixing plate; 22. Fixing unit; 31. Sample box lifting platform; 32. Roller; 33. First roller; 34. Second roller; 41. Jack; 42. Force transmission cylinder; 43. Steel pad; 44. Jack lifting platform; 45. Lifting pad; 51. Crossbeam; 52. Sample box cover; 53. Ring; 54. Wire displacement sensor; 55. Rotary encoder; 6. Shock-absorbing rubber pad; 7. L-shaped steel plate. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0030] Example 1

[0031] This embodiment provides a method such as Figure 1 and Figure 2 The device for testing the friction performance of mixed filler and geotextile, as shown, includes a steel frame 1, a geotextile fixing component 2 for fixing the geotextile, a sample box 3 for holding the mixed filler sample, a loading component 4, and a monitoring component 5. The geotextile fixing component 2 is fixedly connected to the middle position of the inner side of one side of the steel frame 1. Figure 3 As shown, the sample box 3 is a rectangular box with two adjacent open sides. One open side of the sample box 3 faces upward, and the other open side of the sample box 3 abuts against the geotextile fixing component 2. One end of the loading component 4 is fixedly connected to the inner side of the steel frame 1 away from the geotextile fixing component 2, and the other end of the loading component 4 abuts against the side of the sample box 3 away from the geotextile fixing component 2 to apply pressure to the sample box 3. The monitoring component 5 is set on the top of the sample box 3 to monitor the vertical displacement of the sample box 3.

[0032] In this embodiment, geotextile is wrapped around the surface of geotextile fixing component 2. A loading device applies force to sample box 3, which is clamped between loading component 4 and geotextile fixing component 2. Mixed filler is filled into sample box 3 as required and brought into contact with the geotextile. The mixed filler is compacted according to the required density for the project. After installing monitoring component 5, the horizontal pressure on sample box 3 is slowly reduced using the loading device until it falls. The magnitude of the force F applied by loading component 4 to sample box 3 at different times and the vertical displacement w measured by monitoring component 5 are recorded using a jack 41 with a digital pressure gauge. Then, sample box 3 and mixed filler are weighed, with the weight being G. The horizontal force applied by loading component 4 when sample box 3 just begins to fall is recorded as F2. The friction coefficient between mixed filler and geotextile is calculated. ; Calculate the shear stress at the interface between the mixed filler and the geotextile at different times. Plot the shear stress τ-displacement w relationship curve.

[0033] In this embodiment, there is indeed friction between the contact surface of the sample box and the geotextile. To reduce the impact of the contact surface between the sample box 3 and the geotextile, the three sides of the sample box 3 that are in contact with the geotextile are polished.

[0034] Example 2

[0035] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 4 As shown, the geotextile fixing assembly 2 includes a fixing plate 21 and a fixing unit 22. The geotextile is wrapped around the outside of the fixing plate 21 by the fixing unit 22; the rest of the structure is the same as in Embodiment 1.

[0036] In this embodiment, the fixing plate 21 can be a wooden board, and the fixing unit 22 can be a U-shaped nail. There are 4 U-shaped nails. After the geotextile is wrapped around the wooden board, the geotextile is fixed to the wooden board by the U-shaped nails, which facilitates subsequent measurement.

[0037] Example 3

[0038] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 5As shown, the loading assembly 4 includes a jack 41 and a force transmission cylinder 42. The base of the jack 41 is fixedly connected to the inner side of the steel frame 1 away from the geotextile fixing assembly 2. The piston top surface of the jack 41 is connected to one end of the force transmission cylinder 42, and the other end of the force transmission cylinder 42 abuts against the side of the sample box 3 away from the geotextile fixing assembly 2. The loading assembly 4 also includes a jack lifting platform 44 for supporting the jack 41 and the force transmission cylinder 42. The jack lifting platform 44 is set at the bottom of the jack 41 and the force transmission cylinder 42. A lifting pad 45 is provided on the top of the jack lifting platform 44, and the lifting pad 45 is nested and connected to the jack 41 and the force transmission cylinder 42 respectively. Steel pads 43 are provided at both ends of the force transmission cylinder 42. The rest of the structure is the same as in Embodiment 1.

[0039] In this embodiment, the base of the jack 41 is fixedly connected to the inner side of the steel frame 1 away from the geotextile fixing component 2. The piston top surface of the jack 41 is connected to one end of the force transmission cylinder 42, and the other end of the force transmission cylinder 42 abuts against the side of the sample box 3 away from the geotextile fixing component 2. At the start of the test, the jack 41 applies a horizontal force to the sample box 3 through the force transmission cylinder 42, so that the sample box 3 is clamped between the force transmission cylinder 42 and the geotextile fixing component 2. After the mixed filler sample is filled into the sample box 3 and the monitoring component 5 is installed, the handle of the jack 41 is rotated to slowly reduce the horizontal force F applied by the jack 41 to the earth pressure box until the sample box 3 and the mixed filler fall down.

[0040] In this embodiment, by setting a jack support platform 44 at the bottom of the jack 41 and the force transmission cylinder 42, the jack 41 and the force transmission cylinder 42 are prevented from tilting due to gravity causing the end of the jack 41 and the force transmission cylinder 42 near the sample box 3 to move downwards. This would prevent the horizontal force F applied by the jack 41 to the earth pressure box from acting vertically, resulting in errors when calculating the friction coefficient. At the same time, it can prevent the force transmission cylinder 42 from falling directly when the horizontal force F applied by the jack 41 to the earth pressure box is slowly reduced.

[0041] In this embodiment, steel pads 43 are respectively provided at both ends of the force transmission cylinder 42 to prevent the force transmission cylinder 42 and the sample box 3 from being subjected to the horizontal force applied by the jack 41. The force is dispersed by the steel pads 43, and the force on the contact surface between the force transmission cylinder 42 and the sample box 3 and the jack 41 is prevented from being deformed due to excessive pressure on the contact surface.

[0042] Example 4

[0043] Compared with Example 3, the difference in this embodiment is that, in this embodiment, the bottom of the sample box 3 is provided with a sample box lifting platform 31 for supporting the sample box 3; the bottom of the sample box lifting platform 31 is provided with rollers 32, the jack lifting platform 44 is a hollow rectangular structure, and the side of the jack lifting platform 44 near the sample box 3 is provided with a notch, and the sample box lifting platform 31 is embedded in the notch and slides with the notch; the rest of the structure is the same as in Example 3.

[0044] In this embodiment, by setting a sample box lifting platform 31 at the bottom of the sample box 3, at the start of the test, the sample box 3 is placed on the sample box lifting platform 31, and the sample box lifting platform 31 is moved towards the geotextile fixing component 2, so that the sample box 3 and the geotextile on the surface of the geotextile fixing component 2 come into contact. The mixed filler is filled into the sample box 3. After the jack 41 applies a horizontal force to the sample box 3 and clamps the sample box 3 between the geotextile fixing component 2 and the force transmission cylinder 42, the sample box lifting platform 31 is moved away from the geotextile fixing component 2. Since the side of the jack lifting platform 44 has a notch, the sample box lifting platform 31 is embedded in the notch and slides with the notch; therefore, the sample box lifting platform 31 can enter the interior of the jack lifting platform 44. After it is completely inside the jack lifting platform 44, the handle of the jack 41 is rotated, so that the earth pressure and horizontal force F applied by the jack 41 are slowly reduced until the sample box 3 and the mixed filler sample fall down.

[0045] Example 5

[0046] Compared with Embodiment 3, the difference in this embodiment is that, in this embodiment, a first roller 33 is provided on the side of the sample box 3 away from the geotextile fixing component 2, and a second roller 34 is provided at the bottom of the sample box 3; a shock-absorbing rubber pad 6 is provided at the position directly below the sample box 3 on the bottom surface of the steel frame 1; the geotextile fixing component 2 is connected to the steel frame 1 through an L-shaped steel plate 7, one side of the L-shaped steel plate 7 is fixedly connected to the side of the steel frame 1, and the other side of the L-shaped steel plate 7 extends into the steel frame 1 to form a cantilever plate, and the geotextile fixing component 2 is set on the cantilever plate and fixedly connected to the L-shaped steel plate 7; the rest of the structure is the same as in Embodiment 3.

[0047] In this embodiment, a first roller 33 is provided on the side of the sample box 3 away from the geotextile fixing component 2, and a second roller 34 is provided at the bottom of the sample box 3. By providing the first roller 33, the friction coefficient between the sample box 3 and the force transmission cylinder 42 is reduced, preventing the friction coefficient between the sample box 3 and the force transmission cylinder 42 from affecting the calculation of friction between the mixed filler and the geotextile. By providing the second roller 34, the horizontal movement of the sample box lifting platform 31 is facilitated. The first roller 33 and the second roller 34 can effectively reduce the friction force when the sample box 3 moves up, down, left, and right, and at the same time make the force uniform.

[0048] In this embodiment, the shock-absorbing rubber pad 6 is formed by vertically stacking multiple single shock-absorbing rubber pads 6, which can effectively reduce the impact of the test box falling on the test equipment during the test, and also play a certain safety role.

[0049] In this embodiment, placing the geotextile fixing component 2 on the cantilever plate can effectively prevent the geotextile fixing component 2 from sliding down, and facilitates the replacement of the geotextile fixing component 2 after the test is completed for the next round of testing.

[0050] Example 6

[0051] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 6 As shown, the monitoring component 5 includes a loading beam 51 and a sample box cover 52. The sample box cover 52 is detachably connected to the top opening of the sample box 3. A ring 53 is provided on the top of the sample box cover 52. A pull wire displacement sensor 54 is connected to the bottom of the loading beam 51. The pull wire of the pull wire displacement sensor 54 is connected to the ring 53. A rotary encoder is provided at the connection between the loading beam 51 and the pull wire displacement sensor 54. The rest of the structure is the same as in Embodiment 1.

[0052] In this embodiment, the wire displacement sensor 54 is a digital output type S-type with a range of 100-2500mm; the rotary encoder is a photoelectric absolute encoder.

[0053] In this embodiment, the loading beam 51 and the ring 53 are connected by a pull wire. A pull wire displacement sensor 54 is installed on the pull wire. The pull wire displacement sensor 54 and the rotary encoder 55 are used together to achieve accurate measurement of the vertical displacement of the sample box 3.

[0054] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A device for testing the frictional properties of a mixed filler and geotextile, characterized in that: The system includes a steel frame (1), a geotextile fixing component (2) for fixing the geotextile, a sample box (3) for holding the mixed filler sample, a loading component (4), and a monitoring component (5). The geotextile fixing component (2) is fixedly connected to the middle position of the inner side of one side of the steel frame (1). The sample box (3) is a rectangular box with two adjacent sides that are open. One opening of the sample box (3) faces upward, and the other opening of the sample box (3) abuts against the geotextile fixing component (2). One end of the loading component (4) is fixedly connected to the inner side of the steel frame (1) away from the geotextile fixing component (2), and the other end of the loading component (4) abuts against the side of the sample box (3) away from the geotextile fixing component (2) to apply pressure to the sample box (3). The monitoring component (5) is set on the top of the sample box (3) to monitor the vertical displacement of the sample box (3).

2. The device for testing the frictional properties of mixed filler and geotextile according to claim 1, characterized in that: The geotextile fixing assembly (2) includes a fixing plate (21) and a fixing unit (22), with the geotextile wrapped around the outside of the fixing plate (21) by the fixing unit (22).

3. The device for testing the frictional properties of mixed filler and geotextile according to claim 1, characterized in that: The loading component (4) includes a jack (41) and a force transmission cylinder (42). The base of the jack (41) is fixedly connected to the inner side of the steel frame (1) away from the geotextile fixing component (2). The piston top surface of the jack (41) is connected to one end of the force transmission cylinder (42), and the other end of the force transmission cylinder (42) abuts against the side of the sample box (3) away from the geotextile fixing component (2).

4. The device for testing the frictional properties of the mixed filler and geotextile according to claim 3, characterized in that: Steel pads (43) are respectively provided at both ends of the force transmission cylinder (42).

5. The device for testing the frictional properties of the mixed filler and geotextile according to claim 3, characterized in that: The loading component (4) also includes a jack lifting platform (44) for lifting the jack (41) and the force transmission cylinder (42), the jack lifting platform (44) is set at the bottom of the jack (41) and the force transmission cylinder (42); the top of the jack lifting platform (44) is provided with a lifting pad (45), the lifting pad (45) is nested and connected to the jack (41) and the force transmission cylinder (42) respectively.

6. The device for testing the frictional properties of the mixed filler and geotextile according to claim 5, characterized in that: The bottom of the sample box (3) is provided with a sample box lifting platform (31) for supporting the sample box (3).

7. The device for testing the frictional properties of mixed filler and geotextile according to claim 6, characterized in that: The sample box lifting platform (31) is equipped with rollers (32) at the bottom. The jack lifting platform (44) is a hollow rectangular structure. The jack lifting platform (44) has a notch on the side near the sample box (3). The sample box lifting platform (31) is embedded in the notch and slides with the notch.

8. The device for testing the frictional properties of mixed filler and geotextile according to claim 7, characterized in that: The sample box (3) is provided with a first roller (33) on the side away from the geotextile fixing component (2), and a second roller (34) is provided at the bottom of the sample box (3).

9. The device for testing the frictional properties of mixed filler and geotextile according to claim 1, characterized in that: The monitoring component (5) includes a loading beam (51) and a sample box cover (52). The sample box cover (52) is detachably connected to the top opening of the sample box (3). A ring (53) is provided on the top of the sample box cover (52). A pull wire displacement sensor (54) is connected to the bottom of the loading beam (51). The pull wire of the pull wire displacement sensor (54) is connected to the ring (53). A rotary encoder is provided at the connection between the loading beam (51) and the pull wire displacement sensor (54).

10. The device for testing the frictional properties of mixed filler and geotextile according to claim 1, characterized in that: A shock-absorbing rubber pad (6) is provided directly below the sample box (3) on the bottom surface of the steel frame (1).

11. The device for testing the frictional properties of mixed filler and geotextile according to claim 1, characterized in that: The geotextile fixing component (2) is connected to the steel frame (1) through an L-shaped steel plate (7). The side of the L-shaped steel plate (7) is fixedly connected to the side of the steel frame (1), and the other side of the L-shaped steel plate (7) extends into the steel frame (1) to form a cantilever plate. The geotextile fixing component (2) is set on the cantilever plate.

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