A testing device and method for geotechnical testing

Abstract

The application relates to the technical field of geotechnical detection, and discloses a testing device and method for geotechnical test, which comprises a bottom base provided with longitudinal supporting rods on both sides of the upper surface, a top beam fixedly installed at the top end of the longitudinal supporting rods, a driving motor fixedly installed on the upper surface of the top beam, a plug-in pressure applying mechanism and a liquid pressure detection mechanism. The structure comprises a hollow hydraulic cylinder fixedly installed on the upper surface of the bottom base and internally provided with a hollow structure, a piston plate placed in the hollow hydraulic cylinder and capable of moving downward along with a compaction cylinder, and an adjustable hydraulic pressure gauge installed on one side of the hollow hydraulic cylinder and capable of detecting the liquid pressure value in the hollow hydraulic cylinder. The testing device and method for geotechnical test can eliminate the pressure error caused by structural pressure and external force, thereby improving the detection accuracy of the equipment. In addition, the device can accurately obtain the bearing pressure of the detected object at different pressing depths, so as to reflect the real consolidation pressure and consolidation coefficient.

Description

Technical Field

[0001] This invention relates to the field of geotechnical testing technology, specifically to a testing device and method for geotechnical testing. Background Technology

[0002] A consolidation apparatus is an industrial instrument used to determine the compressibility of soil under different loads and confined conditions. It can perform normal slow consolidation tests and rapid consolidation tests, and determine the early consolidation pressure and consolidation coefficient. However, traditional consolidation apparatuses use weights to increase the weight, which makes pressure adjustment inconvenient.

[0003] To this end, Chinese Patent Publication No. CN214585419U discloses a "consolidation apparatus for geotechnical testing". Its main structure includes a testing platform, a mounting bracket, a cylinder, and a load assembly. The top wall of the cylinder is provided with a first air pipe connection port, and the lower side of the cylinder is provided with a through hole. A piston is provided in the inner cavity of the cylinder, and an upper connecting plate is fixedly connected to the lower surface of the piston. A guide rod is connected to the lower surface of the upper connecting plate. The guide rod is set to pass through the through hole on the lower side of the cylinder, and the lower end of the guide rod is connected to an installation tube through a connector. The lower end of the installation tube is connected to a support. By setting up a consolidation apparatus composed of a testing platform, a mounting bracket, a cylinder, and a load assembly, and connecting the first air pipe connection port of the cylinder to an air supply device through an air inlet pipe, pressure is applied to the load assembly by increasing the air pressure in the cylinder, thereby achieving the purpose of conveniently adjusting the pressure on the load assembly.

[0004] It is obvious that during the testing process of the aforementioned consolidation apparatus for geotechnical testing, the testing pressure is affected by the helical spring (which exhibits different forces under different degrees of compression) and the gravity of the structure, resulting in a large error in the test results and insufficient testing accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a testing device and method for geotechnical testing, which can eliminate pressure errors caused by structural pressure and external forces, thereby improving the detection accuracy of the equipment. In addition, the device can accurately determine the pressure borne by the tested object at different pressure depths, so as to reflect the true consolidation pressure and consolidation coefficient, thus solving the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing device and method for geotechnical testing, comprising a bottom base with longitudinal support rods installed on both sides of its upper surface, a top crossbeam fixedly installed at the top of the longitudinal support rods, and a drive motor fixedly installed on the upper surface of the top crossbeam; further comprising an insertion-type pressure application mechanism, the structure of which includes a compaction cylinder for storing the sample to be tested, an insertion column located directly above the compaction cylinder and capable of being inserted into the compaction cylinder, and a scale line provided on the circumferential side of the insertion column for displaying the insertion depth of the insertion column; and a liquid pressure detection mechanism, the structure of which includes a hollow hydraulic cylinder fixedly installed on the upper surface of the bottom base and having a hollow internal structure, a piston plate placed inside the hollow hydraulic cylinder and capable of moving downward with the compaction cylinder, and an adjustable hydraulic gauge installed on one side of the hollow hydraulic cylinder and capable of detecting the liquid pressure value inside the hollow hydraulic cylinder.

[0007] Preferably, the insertion pressure mechanism further includes a linkage rod integrally disposed on the upper surface of the pressing column, the compaction cylinder has a compaction cavity with an open top, the top of the linkage rod is provided with a first mounting plate integrally disposed therewith, the bottom of the compaction cylinder is provided with a second mounting plate integrally disposed therewith, and the circumferential side of the pressing column is provided with a scale line for displaying the insertion depth of the pressing column.

[0008] Preferably, the structural radius of the compaction cavity is adapted to the structural radius of the press-in column.

[0009] Preferably, the bottom corner of the press-in column is provided with a chamfered structure to facilitate its insertion into the compaction cavity.

[0010] Preferably, the liquid pressure detection mechanism further includes a No. 3 mounting plate integrally disposed at the bottom of the hollow hydraulic cylinder, and the No. 3 mounting plate is fixedly installed on the upper surface of the bottom base. The hollow hydraulic cylinder has a hydraulic chamber inside, and a No. 1 rod through hole is provided at the top of the hollow hydraulic cylinder to connect the hydraulic chamber and the external space. A limiting flow groove is provided at the bottom of the hydraulic chamber. A docking channel is provided on one side of the hollow hydraulic cylinder to connect to the side of the limiting flow groove. An adjustable hydraulic gauge is fixedly installed at the end of the docking channel. A piston plate capable of moving along its axial direction is placed inside the hydraulic chamber. The closed area formed by the bottom of the piston plate, the hydraulic chamber, the limiting flow groove, the docking channel and the adjustable hydraulic gauge is filled with hydraulic oil. A hydraulic telescopic rod penetrating the No. 1 rod through hole is fixedly installed on the upper surface of the piston plate. A No. 4 mounting plate is fixedly installed at the top of the hydraulic telescopic rod, and the top of the No. 4 mounting plate is fixedly installed at the bottom of the No. 2 mounting plate.

[0011] Preferably, the structural shape of the perforated cross section of the first rod is consistent with the structural shape of the cross section of the hydraulic telescopic rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the first rod match the structural dimensions of the cross section of the hydraulic telescopic rod.

[0012] Preferably, it also includes a threaded driven mechanism, the structure of which includes an external threaded rod that can rotate with the rotor of the drive motor, an upper movable plate that moves downward with the rotation of the external threaded rod, a lower movable plate that moves with the upper movable plate and can drive the pressing column to move longitudinally, and a longitudinal limiting rod that can prevent the upper and lower movable plates from rotating.

[0013] Preferably, the threaded driven mechanism further includes internal threaded holes and a second rod through hole located at the center and both sides of the upper movable plate. A lower movable plate is fixedly installed at the bottom of the upper movable plate via a lower connecting rod. A first mounting plate is fixedly installed on the bottom surface of the lower movable plate. The rod of the external threaded rod is installed in the internal threaded hole via a threaded structure. A first limiting head with an integral structure is provided at the bottom end of the external threaded rod. A fifth mounting plate with an integral structure and fixedly installed at the end of the drive motor rotor is provided at the top end of the external threaded rod. The rod of the longitudinal limiting rod passes through the second rod through hole. A second limiting head with an integral structure is provided at the bottom end of the longitudinal limiting rod. The top end of the longitudinal limiting rod is fixedly installed at the bottom of the top crossbeam via a sixth mounting plate.

[0014] Preferably, the structural shape of the perforated cross section of the second rod is consistent with the structural shape of the cross section of the longitudinal limiting rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the second rod match the structural dimensions of the cross section of the longitudinal limiting rod.

[0015] The preferred method of use is as follows: S1: Place the object to be tested into the compaction chamber, ensuring the object is flat. Calibrate the adjustable hydraulic gauge so that its pressure reading is zero in this state. S2: Start the drive motor. The directional rotating rotor will drive the external threaded rod to rotate. Due to the threaded connection, the external threaded rod causes the upper and lower movable plates to move upwards, and drives the pressing column downwards. When the bottom of the pressing column is inserted into the compaction chamber and contacts the upper surface of the object being tested, observe the corresponding scale line and record it as H_initial. S3: When the pressing column reaches the required depth on the object being tested, record it as H_final. Observe the pressure value displayed on the adjustable hydraulic gauge at this time and record it as F_pressure. S4: Calculate by subtracting H_initial from H_final to obtain the pressing depth. F_pressure is the pressure value at this pressing depth, thus determining whether the object being tested meets the expected target value.

[0016] Compared with the prior art, the present invention provides a testing device and method for geotechnical testing, which has the following beneficial effects: It can eliminate pressure errors caused by structural pressure and external forces, thereby improving the detection accuracy of the equipment. In addition, the device can accurately determine the pressure borne by the tested object at different pressure depths, so as to reflect the true consolidation pressure and consolidation coefficient. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the insertion-type pressure application mechanism in this invention; Figure 4 This is a perspective cross-sectional view of the insertion-type pressure application mechanism in this invention; Figure 5 This is a perspective view of the liquid pressure detection mechanism in this invention; Figure 6 This is a three-dimensional cross-sectional view of the liquid pressure detection mechanism in this invention; Figure 7 This is a perspective view of the threaded driven mechanism in this invention; Figure 8 This is a three-dimensional cross-sectional view of the threaded driven mechanism in this invention.

[0018] The components include: 1. Bottom base; 2. Longitudinal support rod; 3. Top crossbeam; 4. Drive motor; 5. Insertion-type pressure application mechanism; 51. Press-in column; 52. Compaction cylinder; 53. Linkage rod; 54. Mounting plate No. 1; 55. Mounting plate No. 2; 56. Scale line; 57. Compaction chamber; 58. Chamfered structure; 6. Liquid pressure detection mechanism; 61. Hollow hydraulic cylinder; 62. Hydraulic chamber; 63. Perforation of rod No. 1; 64. Limiting flow groove; 65. Three Mounting plate No. 4; 66. Docking channel; 67. Adjustable hydraulic gauge; 68. Piston plate; 69. Hydraulic telescopic rod; 610. Mounting plate No. 4; 7. Threaded driven mechanism; 71. Upper movable plate; 72. Lower connecting rod; 73. Lower movable plate; 74. Internal threaded hole; 75. Through hole for rod No. 2; 76. External threaded rod; 77. Mounting plate No. 5; 78. Limit head No. 1; 79. Longitudinal limit rod; 710. Mounting plate No. 6; 711. Limit head No. 2. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 and Figure 2 A testing device and method for geotechnical testing includes a bottom base 1 with longitudinal support rods 2 installed on both sides of the upper surface, a top crossbeam 3 fixedly installed at the top of the longitudinal support rods 2, and a drive motor 4 fixedly installed on the upper surface of the top crossbeam 3. The bottom base 1 needs to be placed flat on a table or ground to ensure the stability of the operation.

[0021] To achieve accurate response to the depth of pressure on the detected object, please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4 An insertion-type pressure mechanism 5 needs to be set up. Its structure includes a compaction cylinder 52 for storing the sample to be tested, an insertion column 51 located directly above the compaction cylinder 52 and capable of being inserted into the compaction cylinder 52, and a scale line 56 set on the circumferential side of the insertion column 51 for displaying the insertion depth of the insertion column 51. The object to be tested is placed inside the compaction chamber 57, and the object to be tested needs to be in a flat state. When the bottom of the insertion column 51 is inserted into the compaction chamber 57 and contacts the upper surface of the object to be tested, the corresponding scale line 56 is observed and recorded as H_initial. When the insertion column 51 presses down to the object to be tested to the required depth, it is recorded as H_final. By calculating, H_final is subtracted from H_initial to obtain the pressed depth, thereby achieving an accurate response to the pressed depth of the object to be tested.

[0022] For details regarding the specific structure of the insertable pressure mechanism 5, please refer to [link / reference]. Figure 3 and Figure 4 It also includes a linkage rod 53 integrally disposed on the upper surface of the pressing column 51. The compaction cylinder 52 is provided with a compaction cavity 57 with an open top. The top of the linkage rod 53 is provided with a first mounting plate 54 integrally disposed with it. The bottom of the compaction cylinder 52 is provided with a second mounting plate 55 integrally disposed with it. The circumferential side of the pressing column 51 is provided with a scale line 56 for displaying the insertion depth of the pressing column 51. The structural radius of the compaction cavity 57 is adapted to the structural radius of the pressing column 51. The bottom corner of the pressing column 51 is provided with a chamfered structure 58 to facilitate its insertion into the compaction cavity 57.

[0023] To achieve a precise response to pressure, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6A liquid pressure detection mechanism 6 needs to be set up. Its structure includes a hollow hydraulic cylinder 61 fixedly installed on the upper surface of the bottom base 1 and having a hollow internal structure, a piston plate 68 placed inside the hollow hydraulic cylinder 61 and able to move downward with the compaction cylinder 52, and an adjustable hydraulic gauge 67 installed on one side of the hollow hydraulic cylinder 61 and able to detect the liquid pressure value inside the hollow hydraulic cylinder 61. When the object to be tested is placed inside the compaction chamber 57, the weight of the object to be tested, the weight of the compaction cylinder 52, the weight of the second mounting plate 55, the weight of the piston plate 68, the weight of the hydraulic telescopic rod 69, and the weight of the fourth mounting plate 610 will generate pressure on the hydraulic oil. At this time, the adjustable hydraulic gauge 67 is calibrated so that the pressure displayed in this state is zero. When the object to be tested is subjected to pressure, the pressure will be transmitted to the hydraulic oil, and the hydraulic oil can accurately reflect the pressure to the adjustable hydraulic gauge 67, thereby achieving accurate pressure response.

[0024] For details regarding the specific structure of the liquid pressure detection mechanism 6, please refer to [link / reference]. Figure 5 and Figure 6 It also includes a No. 3 mounting plate 65 integrally disposed at the bottom of the hollow hydraulic cylinder 61, and the No. 3 mounting plate 65 is fixedly installed on the upper surface of the bottom base 1. The hollow hydraulic cylinder 61 has a hydraulic chamber 62 inside. The top of the hollow hydraulic cylinder 61 has a No. 1 rod through hole 63 connecting the hydraulic chamber 62 and the external space. The bottom of the hydraulic chamber 62 has a limiting flow groove 64. One side of the hollow hydraulic cylinder 61 has a docking channel 66 connecting the side of the limiting flow groove 64. An adjustable hydraulic gauge 67 is fixedly installed at the end of the docking channel 66. The hydraulic chamber 62 has a piston plate 68 that can move along its axial direction. The enclosed area formed by the bottom, hydraulic chamber 62, limiting flow groove 64, docking channel 66, and adjustable hydraulic gauge 67 is filled with hydraulic oil. A hydraulic telescopic rod 69 that passes through the first rod body through hole 63 is fixedly installed on the upper surface of the piston plate 68. A fourth mounting plate 610 is fixedly installed on the top of the hydraulic telescopic rod 69, and the top of the fourth mounting plate 610 is fixedly installed on the bottom of the second mounting plate 55. The cross-sectional shape of the first rod body through hole 63 is consistent with the cross-sectional shape of the hydraulic telescopic rod 69, both being polygonal structures, and the cross-sectional dimensions of the first rod body through hole 63 match the cross-sectional dimensions of the hydraulic telescopic rod 69.

[0025] To achieve feed pressure, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8A threaded driven mechanism 7 needs to be set up. Its structure includes an external threaded rod 76 that can rotate with the rotor of the drive motor 4, an upper movable plate 71 that moves downward with the rotation of the external threaded rod 76, a lower movable plate 73 that moves with the upper movable plate 71 and can drive the pressing column 51 to move longitudinally, and a longitudinal limiting rod 79 that can prevent the upper movable plate 71 and the lower movable plate 73 from rotating. When the drive motor 4 is started, the rotor that rotates in a specific direction will drive the external threaded rod 76 to rotate. Due to the connection of the threaded structure, the external threaded rod 76 causes the upper movable plate 71 and the lower movable plate 73 to move upward and drive the pressing column 51 to move downward, thereby realizing the feed pressure.

[0026] For details regarding the specific structure of the threaded driven mechanism 7, please refer to [link / reference]. Figure 7 and Figure 8 It also includes internal threaded holes 74 and second rod through holes 75 located at the center and both sides of the upper movable plate 71. A lower movable plate 73 is fixedly installed at the bottom of the upper movable plate 71 via a lower connecting rod 72. A first mounting plate 54 is fixedly installed on the bottom surface of the lower movable plate 73. The rod body of the external threaded rod 76 is installed in the internal threaded hole 74 via a threaded structure. A first limiting head 78, integrally formed with the bottom end of the external threaded rod 76, is provided. A first limiting head 78, integrally formed with the top end of the external threaded rod 76, is fixedly installed at the rotor end of the drive motor 4. Mounting plate 77, the longitudinal limiting rod 79 passes through the second rod through hole 75, the bottom end of the longitudinal limiting rod 79 is provided with a second limiting head 711 integral with it, the top end of the longitudinal limiting rod 79 is fixedly installed to the bottom of the top crossbeam 3 through mounting plate 710, the cross-sectional shape of the second rod through hole 75 is consistent with the cross-sectional shape of the longitudinal limiting rod 79, both are polygonal structures, and the cross-sectional dimensions of the second rod through hole 75 match the cross-sectional dimensions of the longitudinal limiting rod 79.

[0027] When using this device, follow these steps: S1: Place the object to be tested into the compaction chamber 57, ensuring it is flat. Calibrate the adjustable hydraulic gauge 67 so that its pressure reading is zero. S2: Start the drive motor 4. The directional rotating rotor will drive the external threaded rod 76 to rotate. Due to the threaded connection, the external threaded rod 76 causes the upper movable plate 71 and lower movable plate 73 to move upwards, and drives the pressing column 51 downwards. When the bottom of the pressing column 51 is inserted into the compaction chamber 57 and contacts the upper surface of the object being tested, observe the corresponding scale line 56 and record it as H_initial. S3: When the pressing column 51 reaches the required depth on the object being tested, record it as H_final. Observe the pressure value displayed on the adjustable hydraulic gauge 67 at this time and record it as F_pressure. S4: Calculate the pressing depth by subtracting H_initial from H_final. F_pressure is the pressure value at this pressing depth, indicating whether the object being tested meets the expected target value.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for geotechnical testing, comprising a bottom base (1) with longitudinal support rods (2) mounted on both sides of its upper surface, a top crossbeam (3) fixedly mounted on the top of the longitudinal support rods (2), and a drive motor (4) fixedly mounted on the upper surface of the top crossbeam (3), characterized in that: It also includes, The insertion pressure mechanism (5) includes a compaction cylinder (52) for storing the sample to be tested, an insertion column (51) located directly above the compaction cylinder (52) and capable of being inserted into the compaction cylinder (52), and a scale line (56) provided on the circumferential side of the insertion column (51) for displaying the insertion depth of the insertion column (51). And a liquid pressure detection mechanism (6), the structure of which includes a hollow hydraulic cylinder (61) fixedly installed on the upper surface of the bottom base (1) and having a hollow internal structure, a piston plate (68) placed inside the hollow hydraulic cylinder (61) and capable of moving downward with the compaction cylinder (52), and an adjustable hydraulic gauge (67) installed on one side of the hollow hydraulic cylinder (61) and capable of detecting the liquid pressure value inside the hollow hydraulic cylinder (61).

2. The testing device for geotechnical testing according to claim 1, characterized in that: The insertion pressure mechanism (5) also includes a linkage rod (53) integrally disposed on the upper surface of the pressing column (51). The compaction cylinder (52) has a compaction cavity (57) with an open top. The top of the linkage rod (53) is provided with a first mounting plate (54) integrally disposed with it. The bottom of the compaction cylinder (52) is provided with a second mounting plate (55) integrally disposed with it. The circumferential side of the pressing column (51) is recessed with a scale line (56) for displaying the insertion depth of the pressing column (51).

3. The testing device for geotechnical testing according to claim 2, characterized in that: The structural radius of the compaction cavity (57) is adapted to the structural radius of the press-in column (51).

4. The testing device for geotechnical testing according to claim 3, characterized in that: The bottom corner of the press-in column (51) is provided with a chamfered structure (58) to facilitate its insertion into the compaction cavity (57).

5. A testing device for geotechnical testing according to claim 4, characterized in that: The liquid pressure detection mechanism (6) also includes a No. 3 mounting plate (65) integrally set at the bottom of the hollow hydraulic cylinder (61), and the No. 3 mounting plate (65) is fixedly installed on the upper surface of the bottom base (1). The hollow hydraulic cylinder (61) is provided with a hydraulic chamber (62) inside. The top of the hollow hydraulic cylinder (61) is provided with a No. 1 rod through hole (63) connecting the hydraulic chamber (62) and the external space. The bottom of the hydraulic chamber (62) is provided with a limiting flow groove (64). One side of the hollow hydraulic cylinder (61) is provided with a docking channel (66) connecting the side of the limiting flow groove (64). The end of the docking channel (66) is... An adjustable hydraulic gauge (67) is fixedly installed. Inside the hydraulic chamber (62) is a piston plate (68) that can move along its axial direction. The closed area formed by the bottom of the piston plate (68), the hydraulic chamber (62), the limiting flow groove (64), the docking channel (66), and the adjustable hydraulic gauge (67) is filled with hydraulic oil. A hydraulic telescopic rod (69) that passes through the first rod body through hole (63) is fixedly installed on the upper surface of the piston plate (68). A fourth mounting plate (610) is fixedly installed on the top of the hydraulic telescopic rod (69), and the top of the fourth mounting plate (610) is fixedly installed on the bottom of the second mounting plate (55).

6. A testing device for geotechnical testing according to claim 5, characterized in that: The cross-sectional shape of the first rod through hole (63) is consistent with the cross-sectional shape of the hydraulic telescopic rod (69), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the first rod through hole (63) match the structural dimensions of the cross-sectional shape of the hydraulic telescopic rod (69).

7. A testing device for geotechnical testing according to claims 2-6, characterized in that: It also includes a threaded driven mechanism (7), the structure of which includes an external threaded rod (76) that can rotate with the rotor of the drive motor (4), an upper movable plate (71) that moves downward with the rotation of the external threaded rod (76), a lower movable plate (73) that moves with the upper movable plate (71) and can drive the press-in column (51) to move longitudinally, and a longitudinal limiting rod (79) that can prevent the upper movable plate (71) and the lower movable plate (73) from rotating.

8. A testing device for geotechnical testing according to claim 7, characterized in that: The threaded driven mechanism (7) further includes internal threaded holes (74) and second rod through holes (75) located at the center and both sides of the upper movable plate (71). The bottom of the upper movable plate (71) is fixedly mounted with a lower movable plate (73) via a lower connecting rod (72). A first mounting plate (54) is fixedly mounted on the bottom surface of the lower movable plate (73). The rod of the external threaded rod (76) is installed in the internal threaded hole (74) via a threaded structure. The bottom end of the external threaded rod (76) is provided with an integral part thereof. The structure has a first limiting head (78), and the top of the external thread rod (76) is provided with a fifth mounting plate (77) which is integral with it and fixedly installed at the rotor end of the drive motor (4). The rod body of the longitudinal limiting rod (79) passes through the second rod body through hole (75). The bottom end of the longitudinal limiting rod (79) is provided with a second limiting head (711) which is integral with it. The top of the longitudinal limiting rod (79) is fixedly installed at the bottom of the top beam (3) through the sixth mounting plate (710).

9. A testing device for geotechnical testing according to claim 8, characterized in that: The cross-sectional shape of the perforation (75) of the second rod is consistent with the cross-sectional shape of the longitudinal limiting rod (79), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the perforation (75) of the second rod are matched with the structural dimensions of the cross-sectional shape of the longitudinal limiting rod (79).

10. A detection method for a geotechnical testing device according to claim 9, characterized in that: Includes the following steps: S1: Place the object to be tested into the compaction chamber (57). The object to be tested needs to be in a flat state. The adjustable hydraulic gauge (67) is calibrated so that the pressure displayed in this state is zero. S2: Start the drive motor (4). The directional rotating rotor will drive the external thread rod (76) to rotate. Due to the connection of the threaded structure, the external thread rod (76) causes the upper movable plate (71) and the lower movable plate (73) to move upward, and drives the pressing column (51) to move downward. When the bottom of the pressing column (51) is inserted into the compaction cavity (57) and contacts the upper surface of the object being tested, observe the corresponding scale line (56) and record it as H_initial. S3: When the pressure depth of the press-in column (51) on the object being tested reaches the required depth, record it as H end, and observe the pressure value displayed by the adjustable hydraulic gauge (67) at this time, and record it as F pressure; S4: By calculating H_end minus H_initial, the depth of pressure is obtained, and F_pressure is the pressure value at this depth. This allows us to determine whether the object being tested meets the expected target value.

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