Soft clay strength and soil pressure testing device

Abstract

The utility model relates to the technical field of soft clay detection, in particular to a soft clay strength and soil pressure testing device which comprises a base, and an outer cylinder is arranged in the middle of the top end of the base. When the device is used, a pump compresses gas into the two gas inlet nozzles, the gas enters the guide pipe from the gas inlet nozzles, the piston rod is controlled to press the movable plate downwards until the movable plate is pressed at the upper end of the outer cylinder and is sealed through the sealing end cover, then a passage is switched through the reversing valve, the gas enters the inner cylinder from the communicating pipe, the rubber film is extruded, confining pressure is generated, and the gas is discharged out of the inner cylinder. The hydraulic rod controls the pressing plate to apply axial pressure, the axial strain and the volume strain of the sample can be obtained by analyzing data of the displacement sensor, the shear strength parameter of the soil can be calculated by combining the applied load and strain data, and when the soft clay is axially pressed, the shear strength parameter of the soil can be calculated. And the pressure sensor at the bottom can synchronously measure the counter force at the bottom of the soft clay, so that strength and soil pressure tests can be simultaneously carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of soft clay detection, in particular to a device for testing the strength and earth pressure of soft clay. Background Technique

[0002] The testing of the strength and earth pressure of soft clay is one of the important tests in the fields of soil mechanics and geological engineering. Especially in engineering construction and foundation design, when conducting the testing of the strength and earth pressure of soft clay, engineers and geologists need to consider the physical properties of the soil mass, the groundwater level, environmental conditions, as well as the accuracy and reliability of laboratory equipment to ensure accurate test data for engineering design and soil mass stability assessment.

[0003] Currently, the existing devices for testing the strength and earth pressure of soft clay on the market are usually carried out separately, which means that the same device cannot be used to detect the earth pressure while detecting the soil strength. In this way, a large amount of time is required during the detection, which is not conducive to quickly obtaining the results. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for testing the strength and earth pressure of soft clay to solve the problems mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for testing the strength and earth pressure of soft clay, comprising

[0007] A base, in the middle of the top end of the base, there is an outer cylinder, and a bearing mechanism is arranged inside the outer cylinder;

[0008] Above the top end of the outer cylinder close to the base, there is a top plate. Guide rods are arranged at the four corners of the base and the top plate, and a movable plate is movably installed between the outer cylinder and the top plate on the four guide rods;

[0009] In the middle of the movable plate, there is a first pressurizing mechanism, and between the top plate and the outer cylinder, there is a second pressurizing mechanism.

[0010] Preferably, the bearing mechanism includes an inner cylinder, the inner cylinder is arranged inside the outer cylinder, and a rubber membrane is vertically arranged in the middle of the inner side of the outer cylinder;

[0011] Preferably, the first pressurizing mechanism includes a hydraulic rod, the hydraulic rod is arranged in the middle of the top end of the movable plate, the output shaft of the hydraulic rod passes through the movable plate and is fixedly installed with a pressing plate, and a sealing end cover is arranged in the middle of the bottom end of the movable plate;

[0012] Preferably, the second pressing mechanism includes an air inlet nozzle, which is arranged on both sides of the top end of the top plate. The two air inlet nozzles are respectively communicated with a communicating pipe and a conduit through a tee inside the top plate. A piston rod is arranged inside the conduit, and the bottom end of the piston rod is connected to a movable plate. The other end of the communicating pipe passes through the movable plate and is communicated with the inner cylinder inside the outer cylinder through the communicating pipe. A reversing valve is arranged at one end of the communicating pipe close to the top plate;

[0013] Preferably, a bottom support is arranged in the middle of the guide rod. The upper end surface of the bottom support is horizontal with the upper end surface of the outer cylinder. A spring is arranged between the bottom support and the movable plate outside the guide rod;

[0014] Preferably, a pressure sensor is further arranged below the inner side of the rubber membrane, and a displacement sensor is arranged on one side of the middle of the top plate close to the movable plate.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. For this soft clay strength and earth pressure testing device, through the cooperation of the outer cylinder, inner cylinder, rubber membrane, displacement sensor, pressure sensor, piston rod and movable plate, the pump compresses the gas and enters the two air inlet nozzles. The gas enters the conduit from the air inlet nozzle, and the piston rod is controlled to press down the movable plate until the movable plate is pressed against the upper end of the outer cylinder and sealed by the sealing end cover. Then, the passage is switched through the reversing valve. At this time, the gas enters the inner cylinder from the communicating pipe and squeezes the rubber membrane to generate a confining pressure, thereby applying a lateral pressure to the soft clay. At the same time, the hydraulic rod is started, and the hydraulic rod controls the pressing plate to apply an axial pressure. By analyzing the data of the displacement sensor, the axial strain and volume strain of the sample can be obtained. Combining the applied load and strain data, the shear strength parameters of the soil can be calculated. When the soft clay is axially compressed, the pressure sensor at the bottom can synchronously measure the reaction force at the bottom of the soft clay, so that the strength and earth pressure tests can be carried out simultaneously.

[0017] 2. For this soft clay strength and earth pressure testing device, before testing the strength and earth pressure of the soft clay, the movable plate is pushed up by the spring to the lower part of the top plate, and the upper ends of the outer cylinder, inner cylinder and rubber membrane are open. Then, the pretreated soft clay is sleeved into the rubber membrane, which is more convenient for feeding and later taking out the material after the test is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall front view structural schematic diagram of the present utility model;

[0019] Figure 2 is the overall sectional structural schematic diagram of the present utility model;

[0020] Figure 3 For the present utility model Figure 2Enlarged schematic view at position A

[0021] Figure 4 For the present utility model Figure 2 Enlarged schematic view at position B

[0022] In the figure: 1, base; 2, outer cylinder; 3, top plate; 4, guide rod; 5, movable plate; 6, inner cylinder; 7, rubber membrane; 8, hydraulic rod; 9, pressing plate; 10, sealing end cover; 11, air inlet nozzle; 12, connecting pipe; 13, conduit; 14, piston rod; 15, displacement sensor; 16, reversing valve; 17, bottom support; 18, spring; 19, pressure sensor. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a number of" means two or more, unless otherwise specifically defined.

[0025] As Figures 1-4 shown, a technical solution provided by the present utility model:

[0026] A device for testing the strength and earth pressure of soft clay, including a base 1. A middle part at the top end of the base 1 is provided with an outer cylinder 2. A loading mechanism is arranged inside the outer cylinder 2. A top plate 3 is provided directly above the top end of the base 1 near the outer cylinder 2. Guide rods 4 are arranged at the four corners of the base 1 and the top plate 3. A movable plate 5 is movably installed between the four guide rods 4 and located between the outer cylinder 2 and the top plate 3. The loading mechanism includes an inner cylinder 6. The inner cylinder 6 is arranged inside the outer cylinder 2. A rubber membrane 7 is vertically arranged in the middle inside the outer cylinder 2 and on the inner side of the inner cylinder 6;

[0027] In this embodiment, before testing the strength and earth pressure of the soft clay by this device, the movable plate 5 is lifted by the spring 18 to the lower part of the top plate 3. The upper ends of the outer cylinder 2, the inner cylinder 6 and the rubber membrane 7 are open. Then, the pretreated soft clay is sleeved into the rubber membrane 7, which is more convenient for feeding and also convenient for taking out the material after the later test is completed.

[0028] As Figure 2 andFigure 3 As shown in the figure, a first pressurizing mechanism is provided in the middle of the movable plate 5. The first pressurizing mechanism includes a hydraulic rod 8. The hydraulic rod 8 is arranged in the middle of the top end of the movable plate 5. The output shaft of the hydraulic rod 8 passes through the movable plate 5 and is fixedly installed with a pressing plate 9. A sealing end cover 10 is arranged in the middle of the bottom end of the movable plate 5. A second pressurizing mechanism is arranged between the top plate 3 and the outer cylinder 2. The second pressurizing mechanism includes an air inlet nozzle 11. The air inlet nozzle 11 is arranged on both sides of the top end of the top plate 3. Inside the top plate 3, the two air inlet nozzles 11 are respectively communicated with a connecting pipe 12 and a conduit 13 through a tee. A piston rod 14 is arranged inside the conduit 13. The bottom end of the piston rod 14 is connected to the movable plate 5. The other end of the connecting pipe 12 passes through the movable plate 5 and is communicated with the inner cylinder 6 inside the outer cylinder 2 through the connecting pipe 12. A reversing valve 16 is arranged at one end of the connecting pipe 12 close to the top plate 3. A bottom support 17 is arranged in the middle of the guide rod 4. The upper end surface of the bottom support 17 is horizontal with the upper end surface of the outer cylinder 2. A spring 18 is arranged between the bottom support 17 and the movable plate 5 outside the guide rod 4. A pressure sensor 19 is further arranged below the inner side of the rubber membrane 7. A displacement sensor 15 is arranged on one side of the middle of the top plate 3 close to the movable plate 5;

[0029] In this embodiment, after the soft clay is placed inside the rubber membrane 7, start the external pump. The pump compresses the gas and enters the two air inlet nozzles 11. The gas enters the conduit 13 from the air inlet nozzles 11, and the piston rod 14 is controlled to press down the movable plate 5 until the movable plate 5 is pressed against the upper end of the outer cylinder 2 and sealed by the sealing end cover 10. Then, the passage is switched through the reversing valve 16. At this time, the gas enters the inner cylinder 6 from the connecting pipe 12 and squeezes the rubber membrane 7 to generate a confining pressure, thereby applying a lateral pressure to the soft clay. At the same time, start the hydraulic rod 8. The hydraulic rod 8 controls the pressing plate 9 to apply an axial pressure. By analyzing the data of the displacement sensor 15, the axial strain and volume strain of the sample can be obtained. Combining the applied load and strain data, the shear strength parameters of the soil can be calculated. When the soft clay is axially compressed, the pressure sensor 19 at the bottom can synchronously measure the reaction force at the bottom of the soft clay, so that the strength and earth pressure tests can be carried out simultaneously.

[0030] Working principle: Before testing the strength and earth pressure of soft clay, the movable plate 5 is lifted by the spring 18 to the lower part of the top plate 3. The upper ends of the outer cylinder 2, the inner cylinder 6 and the rubber membrane 7 are open. Then the pretreated soft clay is sleeved into the rubber membrane 7, which makes it more convenient to feed the material. Moreover, after the later test is completed, it is also convenient to take out the material. After the soft clay is put into the rubber membrane 7, the external pump is started. The pump compresses the gas and enters the two air inlets 11. The gas enters the conduit 13 from the air inlets 11, and the piston rod 14 is controlled to press down the movable plate 5 until the movable plate 5 is pressed against the upper end of the outer cylinder 2 and sealed by the sealing end cover 10. Then the passage is switched through the reversing valve 16. At this time, the gas enters the inner cylinder 6 from the connecting pipe 12 and squeezes the rubber membrane 7 to generate a confining pressure, thereby applying a lateral pressure to the soft clay. At the same time, the hydraulic rod 8 is started, and the hydraulic rod 8 controls the pressing plate 9 to apply an axial pressure. By analyzing the data of the displacement sensor 15, the axial strain and volume strain of the sample can be obtained. Combining the applied load and strain data, the shear strength parameters of the soil can be calculated. When the soft clay is axially compressed, the pressure sensor 19 at the bottom can synchronously measure the reaction force at the bottom of the soft clay, so that the strength and earth pressure tests can be carried out simultaneously.

[0031] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the strength and earth pressure of soft clay, characterized in that: including a base (1), a middle part of the top end of the base (1) is provided with an outer cylinder (2), and a bearing mechanism is arranged inside the outer cylinder (2); a top plate (3) is arranged directly above the top end of the outer cylinder (2) close to the base (1), guide rods (4) are arranged at four corners of the base (1) and the top plate (3), and a movable plate (5) is movably installed between the four guide rods (4) and located between the outer cylinder (2) and the top plate (3); a first pressurizing mechanism is arranged in the middle of the movable plate (5), and a second pressurizing mechanism is arranged between the top plate (3) and the outer cylinder (2).

2. The strength and earth pressure testing device for soft clay according to claim 1, wherein: The bearing mechanism includes an inner cylinder (6), the inner cylinder (6) is arranged inside the outer cylinder (2), and a rubber film (7) is vertically arranged in the middle of the inner side of the outer cylinder (2) and located inside the inner cylinder (6).

3. The soft clay strength and earth pressure testing device according to claim 1, characterized in that: The first pressurizing mechanism includes a hydraulic rod (8), the hydraulic rod (8) is arranged in the middle of the top end of the movable plate (5), an output shaft of the hydraulic rod (8) passes through the movable plate (5) and is fixedly installed with a pressing plate (9), and a sealing end cover (10) is arranged in the middle of the bottom end of the movable plate (5).

4. A soft clay strength and earth pressure testing device according to claim 1, characterized in that: The second pressurizing mechanism includes an air inlet nozzle (11), the air inlet nozzle (11) is arranged on both sides of the top end of the top plate (3), the two air inlet nozzles (11) are respectively communicated with a communicating pipe (12) and a conduit (13) through a tee inside the top plate (3), a piston rod (14) is arranged inside the conduit (13), a bottom end of the piston rod (14) is connected with the movable plate (5), the other end of the communicating pipe (12) passes through the movable plate (5) and is communicated with the inner cylinder (6) inside the outer cylinder (2) through the communicating pipe (12), and a reversing valve (16) is arranged at one end of the communicating pipe (12) close to the top plate (3).

5. The strength and earth pressure testing device for soft clay according to claim 1, characterized in that: A bottom support (17) is arranged in the middle of the guide rod (4), an upper end surface of the bottom support (17) is horizontal with an upper end surface of the outer cylinder (2), and a spring (18) is arranged outside the guide rod (4) between the bottom support (17) and the movable plate (5).

6. The soft clay strength and earth pressure testing device according to claim 2, characterized in that: A pressure sensor (19) is further arranged below the inner side of the rubber film (7), and a displacement sensor (15) is arranged on one side of the middle part of the top plate (3) close to the movable plate (5).

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