Gravity type dynamic penetration test device and method

Abstract

The invention discloses a gravity type dynamic penetration test device and method, and relates to the technical field of drilling, the test device comprises an experiment frame, a horizontal sliding supporting mechanism, a pressure test cylinder, a penetration assembly and a vertical lifting structure, the horizontal sliding supporting mechanism comprises a sliding supporting plate, a first sliding rail assembly and a first driving structure, the first driving structure is suitable for driving the sliding supporting plate to slide along the first sliding rail assembly. The pressure test cylinder and the sliding support plate are suitable for entering the interior of the experiment frame or moving out of the interior of the experiment frame under the driving of the first driving structure; the penetration assembly is vertically arranged right above the pressure test cylinder; the vertical lifting structure comprises a supporting frame, a second sliding rail assembly, a penetration fixing plate connected to the second sliding rail assembly and a second driving structure connected to the penetration fixing plate. According to the dynamic penetration test method, consolidated soil samples under different depths, soil layer conditions and stress conditions can be simulated, and an automatic self-falling dynamic penetration test can be carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of marine geological exploration, and more specifically to a self-falling dynamic penetration test device and method. Background Art

[0002] Static penetration test is one of the most ideal in-situ test methods for obtaining the physical and mechanical properties of soil, and is widely used in determining the bearing capacity of foundations, undrained shear strength, etc. Marine engineering geological surveys require drilling construction, but since the ship floats on the sea, the hull is constantly up and down with the turbulence of tides and waves, which causes certain difficulties in static penetration measurement.

[0003] In recent years, based on the land static penetration technology, offshore static penetration test equipment has been developed and applied at home and abroad. Since offshore static penetration has high requirements for test equipment and carrying ships, its further widespread application is limited. Therefore, dynamic penetration has been developed on the basis of static penetration technology. For coarse-grained soil or foundation soil with large penetration resistance, additional power in addition to deadweight is required to penetrate the probe.

[0004] A Chinese invention patent with publication number CN104164860B discloses a self-falling pore pressure dynamic probing device for shallow seabed soil. The self-falling pore pressure dynamic probing device includes a third drop hammer, a second drop hammer, a first drop hammer, a stabilizing tail wing, and a probe rod, which are arranged in sequence from top to bottom; a side wall friction sleeve is arranged outside the lower cylinder of the probe rod, a friction sleeve sensor is arranged on the inner wall of the side wall friction sleeve, a pore water pressure sensor, a cone tip pressure sensor, a temperature compensation sensor and an inclinometer sensor are arranged in the middle of the lower cylinder of the probe rod; a pore water pressure sensor and an acceleration sensor are arranged in the middle of the upper cylinder of the probe rod, and the tail of the probe rod, that is, the upper part of the upper cylinder of the probe rod, is connected to the stabilizing tail wing. The self-falling pore pressure dynamic probing equipment is suitable for in-situ dynamic testing of shallow seabed layers of various depths, and can test parameters of various soil layers in-situ, with the characteristics of fastness, accuracy and economy.

[0005] However, the above device is not only complex in structure, but also needs to be tested on site, which is not only time-consuming and labor-intensive, but also costly compared to indoor testing. In addition, during the penetration test, manual assistance is required to lift the probe assembly, which is not only labor-intensive, but also seriously affects the accuracy of the measurement data. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a self-falling dynamic penetration test device and method to solve the technical problems that the dynamic penetration simulation device cannot simulate the actual working conditions and that manual assistance is required to improve the penetration power during the penetration test.

[0007] To achieve the above objectives, the first objective of the present invention is to provide a self-falling dynamic penetration test device, the test device comprising:

[0008] Experimental framework;

[0009] A horizontal sliding support mechanism, comprising a horizontally placed sliding support plate, two first slide rail assemblies connected to opposite sides of the sliding support plate, and a first driving structure suitable for driving the sliding support plate to move, wherein the first driving structure is suitable for driving the sliding support plate to slide in a horizontal direction along the two first slide rail assemblies;

[0010] A pressure test cylinder is vertically placed on the sliding support plate, and the pressure test cylinder and the sliding support plate are suitable for entering into the interior of the experimental frame or moving out from the interior of the experimental frame under the drive of the first driving structure;

[0011] A sounding assembly is vertically arranged just above the pressure test cylinder;

[0012] A vertical lifting structure includes a support frame installed on the top of the experimental frame, a second slide rail assembly vertically installed on one side of the support frame, a penetration fixing plate connected to the second slide rail assembly, and a second driving structure connected to one side of the penetration fixing plate, wherein the second driving structure is suitable for driving the penetration fixing plate to slide along the second slide rail assembly, the top of the probe assembly is suitable for being suspended on the lower surface of the penetration fixing plate, and the probe assembly is suitable for being lifted to a set height under the action of the vertical lifting structure and then freely falling into the soil sample of the pressure test cylinder.

[0013] Preferably, it further comprises a consolidation loading component, wherein the consolidation loading component comprises:

[0014] A pressure plate, adapted to be slidably connected to the top inner wall of the pressure test cylinder;

[0015] A consolidation oil cylinder is vertically and invertedly mounted on the top surface of the test frame, and the end of the extended rod of the consolidation oil cylinder is vertically connected to the pressure plate;

[0016] A guide tube is vertically arranged on the experimental frame and the pressure plate and is located directly below the sounding assembly. The sounding assembly is suitable for vertically penetrating into the soil sample of the pressure test cylinder through the guide tube.

[0017] Preferably, the first slide rail assembly comprises a first slide rail and a first slider slidably connected to the first slide rail, and a side of the first slider facing away from the first slide rail is fixedly connected to a side surface of the slide support plate;

[0018] The two first slide rails are arranged parallel to each other and are fixedly connected at the ends by a connecting plate, one end of the two first slide rails is horizontally inserted into the inner bottom of the experimental frame, and the other end extends out of the experimental frame;

[0019] The two first sliding blocks slide on the corresponding first sliding rails respectively through the first driving structure.

[0020] Preferably, the experimental framework includes:

[0021] A bottom plate, horizontally supported at the bottom of one side of the first slide rail assembly;

[0022] A top plate is arranged directly above the bottom plate in the vertical direction, and a cylinder mounting hole and a guide tube hole are respectively provided on the top plate directly facing the consolidation cylinder and the guide tube, the consolidation cylinder is suitable for being vertically inserted and installed on the top plate through the cylinder mounting hole, and the guide tube is suitable for being vertically inserted and installed on the top plate through the guide tube hole;

[0023] The connecting pieces are respectively connected to the four corners of the bottom plate and the top plate.

[0024] Preferably, the second driving structure includes a rack vertically mounted on one side of the support frame and a gear motor horizontally mounted on the penetration fixing plate, and the gear motor is meshed with the rack for transmission.

[0025] Preferably, the sounding assembly comprises a probe rod and a probe head which are integrally connected in sequence, one end of the probe rod away from the probe head is suspended on the penetration fixing plate, and one end of the probe head away from the probe rod is in a conical thimble structure.

[0026] Preferably, it also includes a sample unloading cylinder arranged on the bottom plate near the outer circumference of the pressure test cylinder, one end of the sample unloading cylinder is connected to the bottom plate through a cylinder seat, and the other end is connected to the outer circumference of the pressure test cylinder through a connecting plate.

[0027] Preferably, the connecting member includes a vertical column, a first angle plate connected to the bottom plate, and a second angle plate connected to the top plate. The bottom end of the vertical column is inserted into the first angle plate, and the top end of the vertical column is inserted into the second angle plate and is locked and fixed by a connecting nut.

[0028] Preferably, two consolidation cylinders are provided, and the two consolidation cylinders are symmetrically arranged along the vertical center axis of the pressure plate.

[0029] The second object of the present invention is to provide a self-falling dynamic penetration test method, using the self-falling dynamic penetration test device described above, the test method comprises:

[0030] Step S 100 : placing the soil sample in a pressure test cylinder, and moving the pressure test cylinder into the experimental frame through a horizontal sliding support mechanism;

[0031] Step S 200 : Adjust the pressure test cylinder to be located directly below the consolidation loading assembly, and obtain the set consolidated soil sample by applying pressure through the consolidation loading assembly;

[0032] Step S 300 : Install the guide tube vertically through the top plate and the pressure plate, and vertically suspend the sounding assembly just above the guide tube;

[0033] Step S 400 : After the probe assembly is lifted to a set height through the second slide rail assembly and the second drive structure of the vertical lifting structure, the probe assembly is allowed to freely fall and vertically penetrate into the soil sample inside the pressure test cylinder through the guide tube, and the penetration mechanical parameters of the soil sample are measured.

[0034] Compared with the prior art, the present invention has the following advantages and effects:

[0035] The self-falling dynamic penetration test device in the present invention is a device for soil testing, which evaluates the physical and mechanical properties of soil by simulating the behavior of soil when subjected to dynamic impact. The test device consists of an experimental frame, a horizontal sliding support mechanism, a pressure test cylinder, a penetration assembly and a vertical lifting structure, wherein the design of the horizontal sliding support mechanism can realize the rapid movement of the sliding support plate on the two first slide rail assemblies, and this design improves the working efficiency and operation accuracy of the system, reduces the need for manual operation, and improves the automation and intelligence level of the system; the penetration assembly is vertically arranged, which can ensure vertical penetration of the soil in the pressure test cylinder, avoid problems such as inaccurate test data caused by angle deviation, and also help to obtain more accurate in-situ characteristic parameters of the soil; the penetration fixing plate is driven by the second driving structure to slide along the second slide rail assembly, and the penetration fixing plate can be accurately controlled, and this accurate control helps to ensure the accurate positioning of the penetration assembly above the pressure test cylinder, thereby improving the accuracy and reliability of the test; the second driving structure also helps to automatically lift the penetration assembly to a set fixed height according to the test needs, and solve the problems such as insufficient penetration power in the penetration test.

[0036] The self-falling dynamic penetration test device has many technical effects, such as providing precise control, structural stability, easy operation, adaptability, safety, easy maintenance, improving test efficiency and data collection and analysis, which significantly improves the performance and application value of the entire test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is a schematic diagram of the three-dimensional structure of the self-falling dynamic penetration test device in an embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of a horizontal sliding support mechanism in one direction in an embodiment of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the horizontal sliding support mechanism in another direction in an embodiment of the present invention;

[0040] Figure 4 It is a side view structural schematic diagram of a self-falling dynamic penetration test device in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the three-dimensional structure of the experimental framework in an embodiment of the present invention;

[0042] Figure 6 It is a schematic diagram of the flow of the self-falling dynamic penetration test method in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 10-Experimental framework;

[0045] 11-bottom plate; 12-top plate; 121-cylinder mounting hole; 122-guide tube hole; 13-connecting piece; 131-vertical column; 132-first angle plate; 133-second angle plate; 134-connecting nut;

[0046] 20- horizontal sliding support mechanism;

[0047] 21-sliding support plate; 22-first slide rail assembly; 221-first slide rail; 222-first slider; 23-first driving structure; 231-first driving motor; 232-coupling; 233-bearing seat; 234-screw; 235-screw seat; 24-lifting seat;

[0048] 30-pressure test cylinder;

[0049] 40-unloading cylinder;

[0050] 50-consolidation loading assembly; 51-consolidation cylinder; 52-pressure plate; 53-guide tube;

[0051] 60-probe assembly;

[0052] 61-probe rod; 62-probe;

[0053] 70-vertical lifting structure; 71-support frame; 72-second slide rail assembly; 721-second slide rail; 722-second slider; 73-penetration fixing plate; 74-second driving structure; 741-rack; 742-gear motor. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0058] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] See also Figure 1-5 As shown, an embodiment of the present invention provides a self-falling dynamic penetration test device, which includes a test frame 10, a horizontal sliding support mechanism 20, a pressure test cylinder 30, a penetration assembly 60 and a vertical lifting structure 70, wherein:

[0061] The horizontal sliding support mechanism 20 includes a horizontally placed sliding support plate 21, first slide rail assemblies 22 connected to opposite sides of the sliding support plate 21, and a first driving structure 23 for driving the sliding support plate 21 to move, wherein the first driving structure 23 is suitable for driving the sliding support plate 21 to slide in the horizontal direction along the two first slide rail assemblies 22;

[0062] The pressure test cylinder 30 is vertically placed on the sliding support plate 21. The pressure test cylinder 30 and the sliding support plate 21 are suitable for entering into the interior of the test frame 10 or moving out from the interior of the test frame 10 under the drive of the first driving structure 23; the sounding assembly 60 is vertically arranged directly above the pressure test cylinder 30; the vertical lifting structure 70 includes a support frame 71 installed on the top of the test frame 10, a second slide rail assembly 72 vertically installed on one side of the support frame 71, a penetration fixing plate 73 connected to the second slide rail assembly 72, and a second driving structure 74 connected to one side of the penetration fixing plate 73, the second driving structure 74 is suitable for driving the penetration fixing plate 73 to slide along the second slide rail assembly 72, the top of the sounding assembly 60 is suitable for being suspended on the lower surface of the penetration fixing plate 73, and the sounding assembly 60 is suitable for being lifted to a set height under the action of the vertical lifting structure 70 and then freely falling into the soil sample of the pressure test cylinder 30.

[0063] Specifically in the embodiment of the present invention, since the self-falling dynamic sounding test device evaluates the physical and mechanical properties of the soil by simulating the behavior of the soil when it is subjected to dynamic impact, the test device consists of an experimental frame 10, a horizontal sliding support mechanism 20, a pressure test cylinder 30, a sounding assembly 60 and a vertical lifting structure 70. Through the design of the horizontal sliding support mechanism 20, the sliding support plate 21 can be quickly moved on the two first slide rail assemblies 22, thereby improving the working efficiency and operation accuracy of the entire system, reducing the need for manual operation, and further improving the automation and intelligence level of the system; the vertical setting of the sounding assembly 60 can ensure vertical penetration into the soil in the pressure test cylinder 30, avoiding problems such as inaccurate test data caused by angle deviation, and also helping to obtain more accurate in-situ characteristic parameters of the soil; the second driving structure 74 drives the penetration fixing plate 73 to slide along the second slide rail assembly 72, so that precise control of the penetration fixing plate 73 can be achieved. This precise control helps to ensure the accurate positioning of the sounding assembly 60 above the pressure test cylinder 30, thereby improving the accuracy and reliability of the test. The second driving structure 74 is also helpful to automatically lift the probe assembly 60 to a set fixed height according to test requirements, thereby solving problems such as insufficient probe power during penetration testing.

[0064] The self-falling dynamic penetration test device has many technical effects, such as providing precise control, structural stability, easy operation, adaptability, safety, easy maintenance, improving test efficiency and data collection and analysis, which significantly improves the performance and application value of the entire test device.

[0065] For further information, see Figure 1 , 4 As shown, the self-falling dynamic penetration test device also includes a consolidation loading assembly 50, and the consolidation loading assembly 50 includes a pressure plate 52, a consolidation cylinder 51 and a guide pipe 53, wherein:

[0066] The pressure plate 52 is suitable for being slidably connected to the top inner wall of the pressure test cylinder 30; the consolidation cylinder 51 is vertically invertedly installed on the top surface of the test frame 10, and the end of the extension rod of the consolidation cylinder 51 is vertically connected to the pressure plate 52; the guide tube 53 is vertically penetrated through the test frame 10 and the pressure plate 52, and is located directly below the sounding assembly 60, and the sounding assembly 60 is suitable for vertically penetrating into the soil sample of the pressure test cylinder 30 through the guide tube 53.

[0067] As a preferred embodiment of the present invention, the consolidation loading assembly 50 is composed of a pressure plate 52, a consolidation oil cylinder 51 and a guide tube 53, wherein the pressure plate 52 is connected to the top inner wall of the pressure test cylinder 30, and the consolidation oil cylinder 51 is invertedly installed on the top surface of the test frame 10, and the end of its extension rod is connected to the pressure plate 52; the guide tube 53 is passed through the test frame 10 and the pressure plate 52, and the guide tube 53 is located directly below the sounding assembly 60. Before the experiment begins, the soil sample is pre-pressed by the consolidation loading assembly 50 to simulate the static load that the soil is subjected to in actual engineering, so as to facilitate the subsequent dynamic sounding test; the sounding assembly 60 vertically penetrates the soil sample in the pressure test cylinder 30 through the guide tube 53 to ensure the verticality and accuracy of the sounding process, so as to obtain reliable test data.

[0068] By analyzing the penetration depth, penetration speed and soil resistance of the probe assembly 60, the undrained shear strength, compression modulus and other parameters of the soil can be evaluated. These parameters have important reference value for engineering design and construction. For example, the data obtained by the self-falling dynamic penetration test device can be used to evaluate the bearing capacity and stability of the soil, thereby providing a basis for engineering design.

[0069] For further information, see Figure 1 , 2 As shown in FIG. 3 , the first slide rail assembly 22 includes a first slide rail 221 and a first slider 222 slidably connected to the first slide rail 221 , and a side of the first slider 222 facing away from the first slide rail 221 is fixedly connected to a side surface of the sliding support plate 21;

[0070] The two first slide rails 221 are arranged in parallel and spaced apart from each other, and are fixedly connected at the ends by a connecting plate. One end of the two first slide rails 221 is horizontally inserted into the inner bottom of the experimental frame 10, and the other end extends to the outside of the experimental frame 10; the two first sliders 222 slide on the corresponding first slide rails 221 respectively through the first driving structure 23.

[0071] Specifically in the embodiment of the present invention, the two first slide rails 221 are arranged in parallel and spaced apart, which can ensure that the first slider 222 moves linearly on the slide rail, reduce the friction and wear of the sliding support plate 21 during the movement, and maintain the stability and reliability of the movement; the ends of the two first slide rails 221 are fixedly connected by a connecting plate, which helps to maintain the parallelism and stability of the first slide rails 221 and prevent the slide rails from being misaligned due to external forces; the side of the first slider 222 away from the first slide rail 221 is fixedly connected to the side of the sliding support plate 21. This fixing method can ensure that the two sides of the sliding support plate 21 will not flip or shift when moving on the first slide rail 221, thereby ensuring the accuracy of the movement; the insertion and extension of the first slide rail 221 allow the first slider 222 and the sliding support plate 21 to move between the inside and outside of the experimental frame 10, thereby increasing the flexibility of application; the first driving structure 23 is used to drive the first slider 222 to slide on the first slide rail 221, and the first driving structure 23 can be realized by a motor, a cylinder or other forms of driving devices.

[0072] As a preferred mode of this embodiment, the first driving structure 23 includes a first driving motor 231 horizontally mounted on a connecting plate between two first slide rails 221, a coupling 232, a bearing seat 233 mounted on the connecting plate, a lead screw 234 and a lead screw seat 235 threadedly connected to the lead screw 234, the lead screw seat 235 is fixedly connected to the bottom surface of the sliding support plate 21 on one side close to the sliding support plate 21, the two sides of the lead screw 234 are rotatably connected to the connecting plate through the bearing seat 233, and the end is fixedly connected to the output shaft of the first driving motor 231 through the coupling 232. In this way, when the first driving motor 231 is working, the torque is transmitted to the lead screw 234 through the coupling 232, driving the lead screw 234 to rotate, thereby driving the lead screw seat 235 on the lead screw 234 to move by thread, and the top of the lead screw seat 235 is connected to the sliding support plate 21, thereby driving the sliding support plate 21 to slide along the length direction of the two first slide rails 221.

[0073] In addition, lifting seats 24 are connected to the four corners of the bottom of the first slide rail assembly 22 , and the horizontality of the first slide rail assembly 22 can be adjusted through the lifting seats 24 .

[0074] For further information, see Figure 1 , 4 As shown in , 5, the experimental frame 10 includes a bottom plate 11, a top plate 12 and a connecting member 13, wherein:

[0075] The bottom plate 11 is horizontally supported at the bottom of one side of the first slide rail assembly 22; the top plate 12 is arranged directly above the bottom plate 11 in the vertical direction, and the top plate 12 is respectively provided with a cylinder mounting hole 121 and a guide tube hole 122 opposite the consolidation cylinder 51 and the guide tube 53. The consolidation cylinder 51 is suitable for being vertically inserted and installed on the top plate 12 through the cylinder mounting hole 121, and the guide tube 53 is suitable for being vertically inserted and installed on the top plate 12 through the guide tube hole 122; the connecting parts 13 are respectively connected to the four corner peripheries of the bottom plate 11 and the top plate 12.

[0076] Specifically in the embodiment of the present invention, the experimental frame 10 is composed of a bottom plate 11, a top plate 12 and a connecting member 13, and this structure constitutes a stable platform that can support and fix structures such as a consolidation cylinder 51 and a guide tube 53. The bottom plate 11 is horizontally supported at the bottom of one side of the first slide rail assembly 22, which can ensure the stability of the experimental frame 10, and the first slide rail assembly 22 can be used to support the weight of the experimental frame 10, reducing the structural requirements for the experimental frame 10 itself.

[0077] A vertical installation space can be provided between the top plate 12 and the bottom plate 11 for the experimental equipment. The cylinder installation hole 121 and the guide tube hole 122 provided on the top plate 12 allow the consolidation cylinder 51 and the guide tube 53 to be vertically inserted and installed respectively, thereby ensuring the correct positioning and fixation of the consolidation cylinder 51 and the guide tube 53. The connecting parts 13 are respectively connected to the four corners of the bottom plate 11 and the top plate 12, so as to enhance the overall rigidity and stability of the experimental frame 10, and prevent the experimental frame 10 from being deformed or damaged due to external force during the experiment.

[0078] For further information, see Figure 4 As shown, the second driving structure 74 includes a rack 741 vertically mounted on one side of the support frame 71 and a gear motor 742 horizontally mounted on the penetration fixing plate 73, and the gear motor 742 is meshed with the rack 741 for transmission.

[0079] Therefore, the meshing transmission between the gear motor 742 and the rack 741 can provide high transmission efficiency; the gear motor 742 is usually equipped with servo control, which can accurately control the movement of the rack 741. Since the rack 741 is connected to one side of the support frame 71, and the gear motor 742 is horizontally connected to the penetration fixing plate 73, and the gear motor 742 is meshingly transmitted with the rack 741, the gear motor 742 drives the probe assembly 60 on the penetration fixing plate 73 to achieve precise position and speed control, so as to finely adjust the height of the probe assembly 60.

[0080] For further information, see Figure 4As shown, the feeler assembly 60 includes a probe rod 61 and a probe head 62 which are connected in sequence as one body. One end of the probe rod 61 away from the probe head 62 is suspended on the penetration fixing plate 73, and one end of the probe head 62 away from the probe rod 61 is in a conical thimble structure.

[0081] Specifically in this embodiment, the stability of the probe rod 61 in the vertical direction allows the probe 62 to perform penetration operations when needed, which helps to reduce the resistance during the penetration process, so that the probe 62 can more easily penetrate the soil or other materials, thereby improving the penetration efficiency; the penetration fixing plate 73 not only plays the role of fixing the probe rod 61, but may also involve the guidance and support of the probe rod 61, ensuring the stability and verticality of the probe rod 61 during the penetration process.

[0082] For further information, see Figure 1 As shown, the self-falling dynamic probing test device also includes a sample unloading cylinder 40 arranged on the bottom plate 11 near the outer circumference of the pressure test cylinder 30. One end of the sample unloading cylinder 40 is connected to the bottom plate 11 through a cylinder seat, and the other end is connected to the outer circumference of the pressure test cylinder 30 through a connecting plate.

[0083] Since the free-fall dynamic penetration test device obtains power through free fall, impacts and penetrates the soil, the engineering properties of the soil, such as undrained shear strength, can be evaluated by measuring acceleration and angular velocity.

[0084] After the test is completed, the pressure test cylinder 30 is moved out of the test frame 10 through the first slide rail assembly 22 , and then the soil sample is removed from the pressure test cylinder 30 through the sample unloading cylinder 40 .

[0085] For further information, see Figure 1 As shown, the connecting member 13 includes a vertical column 131, a first angle plate 132 connected to the bottom plate 11, and a second angle plate 133 connected to the top plate 12. The bottom end of the vertical column 131 is inserted into the first angle plate 132, and the top end of the vertical column 131 is inserted into the second angle plate 133 and is locked and fixed by a connecting nut 134.

[0086] Thus, the connector 13 realizes a stable connection between the bottom plate 11 and the top plate 12 through the configuration of the vertical column 131, the first angle plate 132 and the second angle plate 133. The bottom and top of the vertical column 131 are respectively connected to the first angle plate 132 and the second angle plate 133 to form a solid triangular support structure; the bottom of the vertical column 131 is plugged into the first angle plate 132, and the top is inserted into the second angle plate 133, and is locked and fixed by the connecting nut 134, which is convenient for quick disassembly and assembly when needed, and is convenient for maintenance and transportation; the vertical column 131 serves as the main force transmission path, and the angle plate provides the necessary support and fixation, ensuring the stability and reliability of the entire device during operation.

[0087] For further information, see Figure 1 , 4 As shown, two consolidation cylinders 51 are provided, and the two consolidation cylinders 51 are symmetrically arranged along the vertical center axis of the pressure plate 52 .

[0088] Therefore, the symmetrically arranged consolidation cylinders 51 can provide a more uniform and stable consolidation force, which is crucial to ensuring the consistency and reliability of the consolidation effect; by controlling the working pressure and stroke of the two consolidation cylinders 51, precise control of the pressure plate 52 can be achieved to obtain the desired consolidation effect; it also helps to improve the safety of the entire system, because the symmetrical force distribution can reduce the potential risks caused by force imbalance.

[0089] Of course, the number of the consolidation cylinders 51 can also be set to three, four, etc., and the consolidation cylinders 51 are evenly and symmetrically arranged on the pressure plate 52 to ensure uniform distribution of force.

[0090] For further information, see Figure 6 As shown, an embodiment of the present invention further provides a self-falling dynamic penetration test method, using the self-falling dynamic penetration test device described above, the test method includes:

[0091] Step S 100 : Place the soil sample in the pressure test cylinder 30, and move the pressure test cylinder 30 into the test frame 10 through the horizontal sliding support mechanism 20;

[0092] Step S 200 : Adjust the pressure test cylinder 30 to be located directly below the consolidation loading assembly 50, and obtain the set consolidated soil sample by applying pressure through the consolidation loading assembly 50;

[0093] Step S 300 : The guide tube 53 is vertically inserted and installed on the top plate 12 and the pressure plate 52, and the probe assembly 60 is vertically suspended just above the guide tube 53;

[0094] Step S 400 : After the probe assembly 60 is lifted to a set height through the second slide rail assembly 72 and the second drive structure 74 of the vertical lifting structure 70, the probe assembly 60 is allowed to freely fall and vertically penetrate into the soil sample inside the pressure test cylinder 30 through the guide tube 53, and the penetration mechanical parameters of the soil sample are measured.

[0095] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A self-falling dynamic penetration test device, characterized in that: include: Experimental framework; A horizontal sliding support mechanism, comprising a horizontally placed sliding support plate, two first slide rail assemblies connected to opposite sides of the sliding support plate, and a first driving structure for driving the sliding support plate to move, wherein the first driving structure is suitable for driving the sliding support plate to slide in a horizontal direction along the two first slide rail assemblies; A pressure test cylinder is vertically placed on the sliding support plate, and the pressure test cylinder and the sliding support plate are suitable for entering into the interior of the experimental frame or moving out from the interior of the experimental frame under the drive of the first driving structure; A sounding assembly is vertically arranged just above the pressure test cylinder; A vertical lifting structure includes a support frame installed on the top of the experimental frame, a second slide rail assembly vertically installed on one side of the support frame, a penetration fixing plate connected to the second slide rail assembly, and a second driving structure connected to one side of the penetration fixing plate, wherein the second driving structure is suitable for driving the penetration fixing plate to slide along the second slide rail assembly, the top of the probe assembly is suspended on the lower surface of the penetration fixing plate, and the probe assembly is suitable for being lifted to a set height under the action of the vertical lifting structure and then freely falling into the soil sample of the pressure test cylinder.

2. The self-falling dynamic penetration test device according to claim 1 is characterized in that: Also included is a consolidation loading assembly, the consolidation loading assembly comprising: A pressure plate, adapted to be slidably connected to the top inner wall of the pressure test cylinder; A consolidation oil cylinder is vertically and invertedly mounted on the top surface of the test frame, and the end of the extended rod of the consolidation oil cylinder is vertically connected to the pressure plate; A guide tube is vertically arranged on the experimental frame and the pressure plate and is located directly below the sounding assembly. The sounding assembly is suitable for vertically penetrating into the soil sample of the pressure test cylinder through the guide tube.

3. The self-falling dynamic penetration test device according to claim 1 is characterized in that: The first slide rail assembly comprises a first slide rail and a first slider slidably connected to the first slide rail, and a side of the first slider facing away from the first slide rail is fixedly connected to the bottom side of the slide support plate; The two first slide rails are arranged parallel to each other and are fixedly connected at the ends by a connecting plate, one end of the two first slide rails is horizontally inserted into the inner bottom of the experimental frame, and the other end extends out of the experimental frame; The two first sliding blocks slide on the corresponding first sliding rails respectively through the first driving structure.

4. The self-falling dynamic penetration test device according to claim 2 is characterized in that: The experimental framework includes: A bottom plate, horizontally supported at the bottom of one side of the first slide rail assembly; A top plate is arranged directly above the bottom plate in the vertical direction, and a cylinder mounting hole and a guide tube hole are respectively provided on the top plate directly facing the consolidation cylinder and the guide tube, the consolidation cylinder is suitable for being vertically inserted and installed on the top plate through the cylinder mounting hole, and the guide tube is suitable for being vertically inserted and installed on the top plate through the guide tube hole; The connecting pieces are respectively connected to the four corners of the bottom plate and the top plate.

5. The self-falling dynamic penetration test device according to claim 1 is characterized in that: The second driving structure includes a rack vertically mounted on one side of the support frame and a gear motor horizontally mounted on the penetration fixing plate, and the gear motor is meshed with the rack for transmission.

6. The self-falling dynamic penetration test device according to claim 1 is characterized in that: The sounding assembly comprises a probe rod and a probe head which are connected in sequence as one body, one end of the probe rod away from the probe head is suspended on the penetration fixing plate, and one end of the probe head away from the probe rod is in a conical thimble structure.

7. The self-falling dynamic penetration test device according to claim 4 is characterized in that: It also includes a sample unloading cylinder arranged on the bottom plate near the outer circumference of the pressure test cylinder. One end of the sample unloading cylinder is connected to the bottom plate through a cylinder seat, and the other end is connected to the outer circumference of the pressure test cylinder through a connecting plate.

8. The self-falling dynamic penetration test device according to claim 4 is characterized in that: The connecting member includes a vertical column, a first angle plate connected to the bottom plate, and a second angle plate connected to the top plate. The bottom end of the vertical column is inserted into the first angle plate, and the top end of the vertical column is inserted into the second angle plate and is locked and fixed by a connecting nut.

9. The self-falling dynamic penetration test device according to claim 2 is characterized in that: There are two consolidation cylinders, and the two consolidation cylinders are symmetrically arranged along the vertical center axis of the pressure plate.

10. A self-falling dynamic penetration test method, using the self-falling dynamic penetration test device according to any one of claims 1 to 9, characterized in that: The test method includes: Step S 100 : placing the soil sample in a pressure test cylinder, and moving the pressure test cylinder into the experimental frame through a horizontal sliding support mechanism; Step S 200 : Adjust the pressure test cylinder to be located directly below the consolidation loading assembly, and obtain the set consolidated soil sample by applying pressure through the consolidation loading assembly; Step S 300 : Install the guide tube vertically through the top plate and the pressure plate, and vertically suspend the sounding assembly just above the guide tube; Step S 400 : After the probe assembly is lifted to a set height through the second slide rail assembly and the second drive structure of the vertical lifting structure, the probe assembly is allowed to freely fall and vertically penetrate into the soil sample inside the pressure test cylinder through the guide tube, and the penetration mechanical parameters of the soil sample are measured.

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