Multi-pressure chamber soil dynamic triaxial testing apparatus

Abstract

A kind of multi-pressure cabin soil dynamic triaxial tester, including data collector, confining pressure controller, counter pressure controller and main tester, the present application relates to the technical field of dynamic strength triaxial test equipment in soil test, the main tester includes lead screw, upper top seat, loading structure, three-cabin pressure chamber and lower cabin base;The application can realize the triaxial test of the dynamic strength of three soil samples simultaneously by improving a single loading rod into three loading rods and through three-cabin pressure chamber and the base with three-cabin setting groove, and if only a single soil sample needs to be tested, it can be converted into a traditional single-cabin test chamber for testing;Through electromagnetic adsorption, the disturbance of air process between installation and manual suction contact surface to soil body is reduced;Through vacuum adsorption, the low-efficiency method of traditional rubber band binding rubber film is abandoned, and the disturbance of binding process to soil body is avoided, reducing the manual operation process in the test process.

Description

Technical Field

[0001] This invention relates to the technical field of triaxial testing equipment for dynamic strength in geotechnical testing, and particularly to a multi-pressure chamber triaxial testing apparatus for soil dynamics. Background Technology

[0002] The triaxial test for soil dynamic strength involves preparing a soil sample of a specific size from undisturbed or remolded soil, encasing it in a rubber diaphragm, and placing it in a true or pseudo triaxial testing machine. By setting the required triaxial dynamic load values ​​(or confining pressure values, vertical dynamic load values), dynamic load frequencies, etc., dynamic loads are applied to the soil sample to obtain its dynamic strength and other dynamic parameters. The triaxial test for soil dynamic strength is widely used in geology, mining, safety, and construction fields, and is an indispensable laboratory test for many dynamic engineering and scientific research projects.

[0003] Currently, triaxial testing equipment for soil dynamic strength is all single-chamber testing instruments, which can only test one soil sample at a time. This greatly affects the testing efficiency. Furthermore, since geotechnical dynamic tests generally require multiple sets of control tests to avoid randomness in the results, using multiple instruments simultaneously would be too costly. The unavoidable differences between multiple instruments can also affect the accuracy of the test results. The difference between dynamic and static triaxial tests is that static triaxial tests generally only require compression of the soil sample, thus not considering tensile stress. However, dynamic triaxial tests must consider tensile stress. Existing dynamic triaxial equipment typically uses a cap mounted above the soil sample with a flared rubber shell fitted onto it, which contacts the upper loading cap... By absorbing air from the contact surface to create a vacuum, compressive force is generated during the descent of the loading cap, and tensile force during its ascent. However, this method requires manual installation, and the contact between the flared rubber shell and the upper loading cap causes significant disturbance to the soil sample, which is detrimental to the accuracy of the test results. In dynamic triaxial testing, after the soil sample is molded and installed on the triaxial apparatus, rubber bands are tied to the upper and lower parts of the soil sample and at the connection between the rubber membrane and the triaxial test platform to prevent external water from entering the rubber membrane. However, during the test, the quality of the rubber bands can compromise the waterproofing effect, and the binding process can easily touch the soil sample, causing disturbance and affecting the accuracy of the test results. To address these problems, this application proposes a multi-pressure chamber dynamic triaxial testing apparatus for soil. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multi-pressure chamber dynamic triaxial testing apparatus for soil. This solves the problems of low efficiency in current dynamic triaxial testing, the limitation of only one test session at a time, and the significant disturbance to soil samples caused by installing tension caps and binding waterproof rubber bands.

[0005] To address the aforementioned problems, this invention proposes a multi-pressure chamber triaxial soil dynamic testing apparatus, comprising a data acquisition unit, a confining pressure controller, a counter-pressure controller, and a main testing unit. The main testing unit comprises a lead screw, an upper top seat, a loading structure, three pressure chambers, and a lower chamber base. The lower chamber base is located at the bottom of the main testing unit. A lead screw is located on the upper left side of the lower chamber base, and a drive motor is installed on the lower left side of the lower chamber base. The output end of the drive motor passes through the lower chamber base and is connected to the lead screw. An auxiliary rod is located on the upper right side of the lower chamber base. The upper top seat is threaded onto the lead screw. A loading structure is installed at the lower end of the upper top seat. The loading structure includes a main controller, a tetrahedral frame structure, and three loading rods. Force sensors and displacement sensors are mounted on the loading rods. An electromagnetic adsorption connector is located at the lower end of the loading rods. All three loading rods, force sensors, and displacement sensors are signal-connected to the main controller.

[0006] Preferably, the lower compartment base has a single-compartment placement slot and a three-compartment placement slot at the upper middle part, and the three-compartment placement slot is composed of three sets of single-compartment placement slots. Several bolts are provided at the upper end of the lower compartment base. A single-compartment pressure chamber is installed at the single-compartment placement slot by bolts, and a three-compartment pressure chamber is installed at the three-compartment placement slot by bolts. The three-compartment pressure chamber is composed of three sets of single-compartment pressure chambers. Through the three-compartment pressure chamber and the lower compartment base with the three-compartment placement slot, the triaxial test of soil dynamic strength of three soil samples can be carried out simultaneously. If only a single soil sample needs to be tested, the lower compartment is provided with a single-compartment placement slot, which can be converted into a traditional single-compartment pressure chamber for testing.

[0007] Preferably, a confining pressure air inlet is installed on the single-chamber pressure chamber, and a force transmission connecting rod is installed on the upper part of the single-chamber pressure chamber. An upper electromagnetic adsorption joint is provided at the upper end of the force transmission connecting rod, and a lower electromagnetic adsorption joint is provided at the lower end of the force transmission connecting rod. During the test, the electromagnetic adsorption method reduces the disturbance to the soil caused by the installation and manual air extraction process between the contact surfaces.

[0008] Preferably, a soil sample base is installed at the bottom of the single-chamber pressure chamber, a back pressure water inlet pipe is installed at the top of the soil sample base, a back pressure water inlet head is installed at the top of the back pressure water inlet pipe, grooves are opened on the sides of the back pressure water inlet head and the soil sample base, a vacuum suction port is installed in the grooves, a rubber membrane is provided outside the back pressure water inlet pipe, and the back pressure water inlet head is located on the top of the rubber membrane, a soil sample mounting seat is provided inside the back pressure water inlet pipe, a soil sample is placed on the soil sample mounting seat, a pore pressure sensor is provided on the soil sample base, and a lower drainage port is opened inside the soil sample base for soil drainage during the soil compression process;

[0009] Preferably, a vacuum suction pump is installed inside the base of the lower compartment, and the vacuum suction pump is connected to a vacuum suction pipe;

[0010] Preferably, electromagnetic coils are provided inside the loading rod electromagnetic adsorption joint, the upper electromagnetic adsorption joint of the force transmission connecting rod, the lower electromagnetic adsorption joint of the force transmission connecting rod, and the back pressure water inlet head.

[0011] Preferably, a confining pressure inlet is provided at the right end of the lower compartment base, and a confining pressure outlet is provided at the upper end of the lower compartment base. The confining pressure outlet is connected to a confining pressure water pump through a water pipe, and the confining pressure air inlet is connected to a confining pressure air pump through an air pipe.

[0012] Preferably, the confining pressure air pump is electrically connected to a confining pressure controller, the confining pressure controller is electrically connected to a computer, the computer is electrically connected to a data acquisition unit and a back pressure controller, the back pressure controller is connected to the back pressure inlet, and the confining pressure controller is connected to the confining pressure water pump signal.

[0013] Preferably, the data acquisition unit is connected to the main controller via signal, and both the displacement sensor and the pore pressure sensor are connected to the data acquisition unit via signal, so as to collect test data in real time;

[0014] The above-described technical solution of the present invention has the following beneficial technical effects:

[0015] This invention is a multi-pressure chamber soil dynamic triaxial testing instrument. By improving the loading structure, a single loading rod is modified into three loading rods. Through the three pressure chambers and the base with a three-chamber placement slot, it is possible to simultaneously perform triaxial tests on the soil dynamic strength of three soil samples. Furthermore, if only a single soil sample needs to be tested, a single-chamber placement slot is provided at the bottom, which can be converted into a traditional single-chamber test chamber for testing.

[0016] This invention improves the connection method between the loading rod and the back pressure inlet head, and improves the traditional connection method between the horn-shaped rubber shell and the loading cap. By using electromagnetic adsorption, it greatly reduces the disturbance to the soil during installation and manual suction of air between the contact surfaces.

[0017] This invention uses vacuum adsorption, which eliminates the inefficient traditional method of binding rubber membranes with rubber bands and avoids disturbance to the soil during the binding process. This greatly reduces manual operation during the test, improves efficiency, and increases the accuracy of the test results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the back pressure water inlet pipe in this invention.

[0020] Figure 3 This is a schematic diagram of the structure of the lower compartment base in this invention.

[0021] Figure 4 These are detailed drawings of the electromagnetic adsorption joint of the loading rod, the upper electromagnetic adsorption joint of the force transmission connecting rod, and the lower electromagnetic adsorption joint of the force transmission connecting rod in this invention.

[0022] Figure 5 This is a detailed view of the back pressure inlet head in this invention.

[0023] Figure 6 This is a detailed view of the soil sample base in this invention.

[0024] Figure 7 These are top and front views of the single-chamber pressure chamber in this invention.

[0025] Figure 8 These are top and front views of the three-compartment pressure chamber structure in this invention.

[0026] Figure 9 This is a schematic diagram of the loading structure in this invention.

[0027] Reference numerals: 1. Computer; 2. Data acquisition unit; 3. Confining pressure air pump; 4. Confining pressure controller; 5. Back pressure controller; 6. Lead screw; 7. Upper top seat; 8. Drive motor; 9. Loading structure; 10. Loading rod; 11. Electromagnetic adsorption connector for loading rod; 12. Confining pressure air inlet; 13. Upper electromagnetic adsorption connector for force transmission connecting rod; 14. Force transmission connecting rod; 15. Lower electromagnetic adsorption connector for force transmission connecting rod; 16. Back pressure water inlet pipe; 17. Back pressure water inlet head; 18. 19. Rubber membrane; 20. Vacuum suction pipe; 21. Soil sample; 22. Soil sample base; 23. Back pressure inlet; 24. Bolt; 25. Vacuum suction pump; 26. Lower chamber base; 27. Confining pressure outlet; 28. Confining pressure inlet; 29. ​​Confining pressure pump; 30. Three-chamber pressure chamber; 31. Three-chamber mounting slot; 32. Electromagnetic coil; 33. Vacuum suction port; 34. Pore pressure sensor; 35. Main testing device; 36. Single-chamber pressure chamber; 37. Single-chamber mounting slot; 38. Auxiliary rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0029] like Figure 1-5As shown, the present invention proposes a multi-pressure chamber soil dynamic triaxial testing apparatus, comprising a data acquisition unit 2, a confining pressure controller 4, a counter-pressure controller 5, and a main testing unit 34. The main testing unit 34 is characterized by comprising a lead screw 6, an upper top seat 7, a loading structure 9, a three-chamber pressure chamber 29, and a lower chamber base 25. The lower chamber base 25 is located at the bottom of the main testing unit 34. The lead screw 6 is located on the upper left side of the lower chamber base 25. A drive motor 8 is installed on the lower left side of the lower chamber base 25, and the output end of the drive motor 8 passes through the lower chamber base 25 and is connected to the lead screw 6. An auxiliary rod 37 is provided on the right side of the end. An upper top seat 7 is threaded onto the lead screw 6. A loading structure 9 is installed at the lower end of the upper top seat 7. The loading structure 9 includes a main controller, a tetrahedral frame structure, and three loading rods 10. Force sensors and displacement sensors are mounted on the loading rods 10. An electromagnetic adsorption connector 11 for the loading rod is provided at the lower end of the loading rod 10. The three loading rods 10, force sensors, and displacement sensors are all connected to the main controller. The main controller drives the three loading rods 10 to move up and down, which facilitates the subsequent stretching and compression of the soil sample. The force and displacement sensors transmit the data to the data acquisition unit 2.

[0030] In an optional embodiment, the lower compartment base 25 has a single-compartment placement slot 36 and a three-compartment placement slot 30 at the upper middle part, and the three-compartment placement slot 30 is composed of three sets of single-compartment placement slots 36. Several bolts 23 are provided at the upper end of the lower compartment base 25. A single-compartment pressure chamber 35 is installed at the single-compartment placement slot 36 by bolts 23, and a three-compartment pressure chamber 29 is installed at the three-compartment placement slot 30 by bolts 23. The three-compartment pressure chamber 29 is composed of three sets of single-compartment pressure chambers 35. Through the three-compartment pressure chamber 29 and the lower compartment base 25 with the three-compartment placement slot 30, triaxial soil dynamic strength tests of three soil samples 20 can be carried out simultaneously. If only a single soil sample needs to be tested, the single-compartment placement slot 36 at the lower part can be converted into a traditional single-compartment pressure chamber 35 for testing.

[0031] In an optional embodiment, a confining pressure air inlet 12 is installed on the single-chamber pressure chamber 35. A force transmission connecting rod 14 is installed on the upper part of the single-chamber pressure chamber 35. An upper electromagnetic adsorption connector 13 is provided at the upper end of the force transmission connecting rod 14, and a lower electromagnetic adsorption connector 15 is provided at the lower end of the force transmission connecting rod 14. During the test, the tension and compression of the soil sample are achieved by the magnetic attraction between the lower electromagnetic adsorption connector 15 and the back pressure water inlet head 17. The electromagnetic adsorption method greatly reduces the disturbance to the soil caused by the installation and manual air extraction process between the contact surfaces. A soil sample base 21 is installed at the bottom of the internal pressure chamber 35. A reverse pressure water inlet pipe 16 is installed at the top of the soil sample base 21, and a reverse pressure water inlet head 17 is installed at the top of the reverse pressure water inlet pipe 16. Grooves are formed on the sides of the reverse pressure water inlet head 17 and the soil sample base 21, and a vacuum suction port 32 is installed in the groove. A rubber membrane 18 is set on the outside of the reverse pressure water inlet pipe 16, and the reverse pressure water inlet head 17 is located on the upper part of the rubber membrane 18. A soil sample mounting seat is set inside the reverse pressure water inlet pipe 16, which facilitates the mounting of the soil sample on the instrument. A soil sample 20 is set on the soil sample mounting seat. The soil sample base 21 is connected to the soil sample via the rubber membrane 18. After connection, air is drawn through the vacuum suction port 32 of the back pressure inlet head 17 to evacuate the air from the rubber membrane 18 and the side groove, ensuring that the rubber membrane 18 is firmly attached to the soil sample mounting base. During the test, after connecting the back pressure inlet head 17 to the soil sample through the rubber membrane 18, air is drawn through the vacuum suction port 32 to evacuate the air from the rubber membrane 18 and the side groove, ensuring that the upper part of the rubber membrane 18 is firmly attached to the back pressure inlet head 17. This vacuum adsorption method eliminates the inefficient traditional method of binding the rubber membrane 18 with rubber bands, avoids disturbance to the soil during the binding process, reduces manual operation during the test, and improves efficiency. To improve efficiency and increase the accuracy of test results, a pore pressure sensor 33 is installed on the soil sample base 21 to measure the pore pressure inside the soil. The soil sample base 21 also has a lower drainage port for draining soil during the compression process. A vacuum suction pump 24 is installed inside the lower chamber base 25, which is connected to a vacuum suction pipe 19. Electromagnetic coils 31 are installed inside the loading rod electromagnetic adsorption joint 11, the upper electromagnetic adsorption joint 13 of the force transmission connecting rod, the lower electromagnetic adsorption joint 15 of the force transmission connecting rod, and the back pressure water inlet head 17.

[0032] In an optional embodiment, a confining pressure inlet 27 is provided at the right end of the lower compartment base 25, and a confining pressure outlet 26 is provided at the upper end of the lower compartment base 25. The confining pressure outlet 26 is connected to a confining pressure water pump 28 through a water pipe, and a confining pressure air inlet 12 is connected to a confining pressure air pump 3 through an air pipe. The confining pressure air pump 3 is electrically connected to a confining pressure controller 4. The confining pressure controller 4 controls the water pump to pump water into the confining pressure chamber. The confining pressure controller 4 is electrically connected to a computer 1. The computer 1 is electrically connected to a data acquisition unit 2 and a back pressure controller 5. The back pressure controller 5 is connected to the back pressure inlet 22. The confining pressure controller 4 is signal-connected to the confining pressure water pump 28. The data acquisition unit 2 is signal-connected to the main controller. The displacement sensor and the pore pressure sensor 33 are both signal-connected to the data acquisition unit 2 to collect test data in real time.

[0033] The working principle of this invention is as follows: During the experiment, the power supply to the computer 1, data acquisition device 2, confining pressure air pump 3, confining pressure controller 4, back pressure controller 5, confining pressure water pump 28, and main test apparatus 34 is first turned on. Then, the prepared soil sample 20 is placed on the soil sample base 21 through the rubber membrane 18. The back pressure water inlet head 17 is fitted onto the upper part of the rubber membrane 18. The vacuum suction pump 24 is turned on, and air is drawn through the vacuum suction pipe 19 and the vacuum suction port 32 on the base to evacuate the air from the rubber membrane 18 and the side groove, ensuring that the upper part of the rubber membrane 18 is firmly attached to the soil sample mounting base to prevent water leakage. By using vacuum adsorption, the inefficient traditional method of binding the rubber membrane 18 with rubber bands is eliminated, and the disturbance to the soil during the binding process is avoided, reducing the experimental time. The manual operation process improves efficiency and increases the accuracy of test results. A pore pressure sensor 33 is used to measure the pore pressure inside the soil. The soil sample base 21 has a drainage port inside for soil drainage during the compression process. After installing three soil samples 20 according to the above steps, the three-compartment pressure chamber 29 is installed on the lower compartment base 25 along the three-ring three-compartment placement groove 30 pre-carved on the outside of the placement groove. The bolts 23 are tightened to prevent water leakage from the three-compartment pressure chamber 29. If only one soil sample 20 needs to be tested during the test, only one soil sample 20 can be installed on one soil sample base 21 and then a single-compartment pressure chamber 35 can be assembled. The single-compartment pressure chamber 35 is then placed along the single-ring single-compartment placement groove 30. The placement slot 36 is installed on the lower chamber base 25 and the bolts 23 are tightened. Through the three-chamber pressure chamber 29 and the lower chamber base 25 with the three-chamber placement slot 30, triaxial soil dynamic strength tests on three soil samples 20 can be performed simultaneously. If only a single soil sample needs to be tested, a single-chamber placement slot 36 is provided at the bottom, which can be converted to a traditional single-chamber pressure chamber 35 for testing. After the soil sample 20 is installed, the drive motor 8 is started, which drives the lead screw 6 to rotate, thereby moving the upper top seat 7 and the loading structure 9 downwards. Then, the electromagnetic adsorption joint 11 of the loading rod is connected to the upper electromagnetic adsorption joint 13 of the force transmission connecting rod using electromagnetic adsorption. Then, the loading rod 10 is driven to move downwards, thereby driving the power transmission... The guide rod 14 moves downward until the lower part of the force transmission connecting rod 14 is electromagnetically connected to the back pressure water inlet head 17 via electromagnetic adsorption. During the test, the electromagnetic adsorption joint 15 at the lower part of the force transmission connecting rod and the back pressure water inlet head 17 are attracted to achieve the stretching and compression of the soil sample. The electromagnetic adsorption method greatly reduces the disturbance to the soil during installation and manual air extraction between the contact surfaces. The three loading rods 10 are driven to move up and down by the main controller, which facilitates the subsequent stretching and compression of the soil sample. The force and displacement sensors transmit the data to the data acquisition unit 2. After the entire installation is completed, the confining pressure water pump 28 fills the chamber with water. Then, the confining pressure air pump 3 is connected to the confining pressure air inlet 12 via an air pipe.The experiment begins by inputting parameters into computer 1 via a backpressure controller 5 connected to a backpressure inlet 22 through a tracheal tube. Data is transmitted in real-time from various sensors to a data acquisition unit 2 and displayed on computer 1 until the experiment concludes.

[0034] It should be understood that the specific embodiments described above are for illustrative purposes or to explain the principles of the invention, and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A multi-pressure chamber soil dynamic triaxial testing apparatus, comprising a data acquisition unit (2), a confining pressure controller (4), a back pressure controller (5), and a main testing apparatus (34), characterized in that, The main test apparatus (34) includes a lead screw (6), an upper top seat (7), a loading structure (9), a three-chamber pressure chamber (29), and a lower chamber base (25). The lower chamber base (25) is located at the bottom of the main test apparatus (34). A lead screw (6) is located on the upper left side of the lower chamber base (25). A drive motor (8) is installed on the lower left side of the lower chamber base (25), and the output end of the drive motor (8) passes through the lower chamber base (25) and is connected to the lead screw (6). An auxiliary rod (37) is provided on the upper right side of the seat (25). The upper top seat (7) is threaded on the screw (6). A loading structure (9) is installed at the lower end of the upper top seat (7). The loading structure (9) includes a main controller, a tetrahedral frame structure and three loading rods (10). A force sensor and a displacement sensor are mounted on the loading rods (10). An electromagnetic adsorption connector (11) for the loading rods (10) is provided at the lower end of the loading rods (10). The three loading rods (10), the force sensor and the displacement sensor are all connected to the main controller signal. The lower compartment base (25) has a single-compartment placement slot (36) and a three-compartment placement slot (30) in the middle of its upper end. The three-compartment placement slot (30) is composed of three sets of single-compartment placement slots (36). Several bolts (23) are provided at the upper end of the lower compartment base (25). A single-compartment pressure chamber (35) is installed at the single-compartment placement slot (36) by bolts (23). A three-compartment pressure chamber (29) is installed at the three-compartment placement slot (30) by bolts (23). The three-compartment pressure chamber (29) is composed of three sets of single-compartment pressure chambers (35). The single-chamber pressure chamber (35) is equipped with a confining pressure air inlet (12), and a force transmission connecting rod (14) is installed on the upper part of the single-chamber pressure chamber (35). An upper electromagnetic adsorption connector (13) is provided at the upper end of the force transmission connecting rod (14), and a lower electromagnetic adsorption connector (15) is provided at the lower end of the force transmission connecting rod (14). A soil sample base (21) is installed at the bottom of the single-chamber pressure chamber (35). A back pressure water inlet pipe (16) is installed at the top of the soil sample base (21). A back pressure water inlet head (17) is installed at the top of the back pressure water inlet pipe (16). A groove is opened on the side of the back pressure water inlet head (17) and the soil sample base (21). A vacuum suction port (32) is installed in the groove. A rubber membrane (18) is set outside the back pressure water inlet pipe (16). The back pressure water inlet head (17) is located above the rubber membrane (18). A soil sample mounting seat is set inside the back pressure water inlet pipe (16). A soil sample (20) is set on the soil sample mounting seat. A pore pressure sensor (33) is set on the soil sample base (21). A lower drain outlet is opened inside the soil sample base (21).

2. The multi-pressure chamber soil dynamic triaxial testing apparatus according to claim 1, characterized in that, The lower compartment base (25) is equipped with a vacuum suction pump (24), which is connected to a vacuum suction pipe (19).

3. The multi-pressure chamber soil dynamic triaxial testing apparatus according to claim 1, characterized in that, Electromagnetic coils (31) are provided inside the loading rod electromagnetic adsorption joint (11), the upper electromagnetic adsorption joint (13) of the force transmission connecting rod, the lower electromagnetic adsorption joint (15) of the force transmission connecting rod, and the back pressure inlet head (17).

4. The multi-pressure chamber soil dynamic triaxial testing apparatus according to claim 1, characterized in that, The lower compartment base (25) is provided with a confining pressure inlet (27) on the right end and a confining pressure outlet (26) on the upper end. The confining pressure outlet (26) is connected to a confining pressure water pump (28) through a water pipe, and the confining pressure air inlet (12) is connected to a confining pressure air pump (3) through an air pipe.

5. A multi-pressure chamber soil dynamic triaxial testing apparatus according to claim 4, characterized in that, The confining pressure air pump (3) is electrically connected to a confining pressure controller (4), the confining pressure controller (4) is electrically connected to a computer (1), the computer (1) is electrically connected to a data acquisition unit (2) and a back pressure controller (5), the back pressure controller (5) is connected to the back pressure inlet (22), and the confining pressure controller (4) is signal connected to the confining pressure water pump (28).

6. The multi-pressure chamber soil dynamic triaxial testing apparatus according to claim 5, characterized in that, The data acquisition unit (2) is connected to the main controller signal, and the displacement sensor and the pore pressure sensor (33) are both connected to the data acquisition unit (2) signal.

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