Silty soil sample extraction device and silty soil sample extraction method

Abstract

The application provides a device and method for extracting a sample of a silt soil, which comprises a soil containing cylinder, an outer ring cutter, a soil cutting device, a soil pressing rod and a rubber film; the soil containing cylinder is used for containing the silt soil obtained from outside; the soil containing cylinder has a hollow columnar structure; the outer ring cutter has a hollow columnar structure, one end of the outer ring cutter is sleeved on the soil containing cylinder and is detachably fixedly connected with the soil containing cylinder; the soil cutting device is installed on the inner side of the outer ring cutter and is located below the connection between the soil containing cylinder and the outer ring cutter; the soil pressing rod is inserted into the soil containing cylinder and is slidably connected with the soil containing cylinder; the rubber film is used for loading the undisturbed soil pushed out from the soil containing cylinder; the rubber film is sleeved on the outer side of the soil containing cylinder and the bottom of the rubber film is attached to the connection between the soil containing cylinder and the outer ring cutter. Compared with the related art, the technical scheme of the application has the advantages of simple structure, easy operation, high controllability, good undisturbed soil structure and high sampling efficiency.

Description

Technical Field

[0001] This invention relates to the field of soil sample extraction devices, and more particularly to a silty soil sample extraction device and a silty soil sample extraction method. Background Technology

[0002] Currently, sampling silty soil is a frequent issue encountered in the engineering geological investigation of foundation pit projects in coastal areas. However, the sampling process faces the following challenges: First, silty soil has a high water content, making it prone to soil loss during sampling; second, it is difficult to obtain undisturbed soil samples for direct triaxial compression testing. Therefore, soil samplers play a crucial role in undisturbed soil sampling.

[0003] The soil sampler of this technology generally includes a connecting shaft, a boot for loading undisturbed soil, six sector-shaped valve plates for cutting, and a spring. The shaft connects the boot to the six sector-shaped valve plates located below, and the spring force causes the valve plates to cut and support the soil. In other solutions, an air valve can be used to create a negative pressure state in the soft soil inside the tube, replacing the spring and preventing soil samples from leaking out from below during the sampler's extraction process.

[0004] However, the soil samplers in this technology can only seal soil samples inside a boot containing undisturbed soil, and cannot be used to directly subject the undisturbed soil to triaxial compression tests. Moreover, when sampling silty soil, the structural devices for handling soil removal are complex, difficult to operate, and have low sampling efficiency; in addition, some disturbance will occur at the bottom of the soil sample, making it difficult to ensure the undisturbed state of the soil sample, resulting in poor controllability of the sampling.

[0005] Therefore, it is necessary to provide a new device and method to solve the above problems. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this invention proposes a silty soil sample extraction device and method that are simple in structure, easy to operate, highly controllable, maintain the original soil structure well, and have high extraction efficiency.

[0007] To address the aforementioned technical problems, in a first aspect, embodiments of the present invention provide a silty soil sample extraction device, the device comprising:

[0008] A soil container is used to hold undisturbed silty soil obtained from the outside; the soil container has a hollow columnar structure.

[0009] An outer ring cutter is used to press the undisturbed soil into the soil-containing cylinder by pressing it into the soil layer to be sampled; the outer ring cutter has a hollow columnar structure, and one end of the outer ring cutter is sleeved on the soil-containing cylinder and forms a detachable and fixed connection with the soil-containing cylinder.

[0010] A soil cutter is installed inside the outer ring cutter and below the connection between the soil-holding cylinder and the outer ring cutter. It is used to cut and support the undisturbed soil collected in the soil-holding cylinder.

[0011] A soil-pressing rod is used to fix the undisturbed soil in the soil-holding cylinder and to push the undisturbed soil out of the soil-holding cylinder; the soil-pressing rod is inserted into the soil-holding cylinder and forms a sliding connection with the soil-holding cylinder; and

[0012] A rubber membrane is used to load the undisturbed soil pushed out from the soil-holding cylinder; the rubber membrane is sleeved on the outside of the soil-holding cylinder and the bottom of the rubber membrane is attached to the connection between the soil-holding cylinder and the outer ring cutter.

[0013] Preferably, the soil-holding cylinder includes a hollow cylindrical body and an annular handle extending from the end of the cylinder away from the outer ring cutter; the end of the cylinder away from the annular handle is connected to the outer ring cutter via a threaded structure to form a detachable and fixed connection.

[0014] Preferably, the outer ring cutter includes a hollow cylindrical outer ring cutter head and a hollow cylindrical outer ring cutter tube extending from the outer ring cutter head, wherein the outer diameter of the outer ring cutter head gradually decreases from one end near the outer ring cutter tube to the other end.

[0015] Preferably, the outer ring cutter barrel includes an annular platform extending from the outer ring cutter head, an outer wall of the cutter barrel extending axially away from the outer periphery of the platform and an inner wall of the cutter barrel extending axially away from the outer ring cutter head, wherein the outer wall of the cutter barrel and the inner wall of the cutter barrel are spaced apart from each other.

[0016] The platform portion is provided with an annular support platform at the end away from the outer ring cutter head, and the support platform is connected to the outer wall of the cutter barrel and the inner wall of the cutter barrel respectively;

[0017] The outer circumferential side of the inner wall of the cutter barrel is provided with an internal thread, and the inner circumferential side of the barrel body away from the annular handle is provided with an external thread that matches the internal thread; the end of the barrel body away from the annular handle is inserted between the outer wall of the cutter barrel and the inner wall of the cutter barrel and connected by a threaded structure formed by the internal thread and the external thread, and the end of the rubber diaphragm near the outer ring cutter is attached and fixed to the support platform.

[0018] Preferably, the outer ring cutter further includes an annular groove formed by the radial indentation of the inner circumference of the platform portion, a tubular channel penetrating the outer wall of the cutter barrel along the axial direction of the outer ring cutter, and a spherical handle disposed on the outer side of the outer wall of the cutter barrel; one end of the tubular channel communicates with the groove, and the other end of the tubular channel extends to the outer side of the outer ring cutter;

[0019] The soil cutter includes a plurality of steel balls installed in the groove and slidably connected to the groove, and a dividing net passing through the groove and fixed to the steel balls. The dividing net is composed of a plurality of nylon ropes, and the nylon ropes extend through the tubular channel to connect with the spherical handle.

[0020] Preferably, the dividing net includes three nylon ropes, two of which are fixed to a plurality of steel balls by means of folding lines to form a mesh structure, and the other nylon rope is located in the groove and connects the steel balls in sequence before extending through the tubular channel to connect with the spherical handle.

[0021] Preferably, the groove comprises multiple annular tubes connected in sequence, the cross-section of the annular tubes is arc-shaped, and the diameter of each annular tube segment is different from the diameter of the two adjacent annular tube segments; each annular tube segment contains at least one steel ball with a diameter matching that of the annular tube segment.

[0022] Preferably, the soil-pressing rod includes a pressing rod, a cylindrical soil-pressing cake and a spherical handle, which are fixedly connected to both ends of the pressing rod.

[0023] The soil compaction cake is matched with the cylinder and housed within the cylinder to form a sliding connection;

[0024] The pressure rod is inserted into the cylinder from the end of the cylinder away from the outer ring cutter;

[0025] The spherical handle is threadedly connected to the pressure rod and is located outside the cylinder.

[0026] Preferably, along the length extension direction of the silty soil sample extraction device, the length of the rubber membrane is longer than the length of the cylinder, and the portion of the rubber membrane extending beyond the cylinder is attached and fixed at the connection between the soil-holding cylinder and the outer ring cutter.

[0027] Secondly, embodiments of the present invention also provide a method for extracting silty soil samples, the method being applied to the silty soil sample extraction apparatus provided in the embodiments of the invention as described above; the method includes:

[0028] Step S1: Assemble the soil-containing cylinder, the outer ring cutter, the soil cutter, the soil-pressing rod, and the rubber membrane to form the silty soil sample extraction device.

[0029] Step S2: Position the silty soil sample extraction device perpendicular to and press it downwards onto the soil layer to be sampled, while simultaneously pressing down the soil pressing rod and sliding it to the connection position between the soil holding cylinder and the outer ring cutter.

[0030] Step S3: When the silty soil sample extraction device stops pressing down, the soil cutter divides and supports the original soil, keeps the soil pressing rod pressed down to the connection position between the soil holding cylinder and the outer ring cutter, and lifts the silty soil sample extraction device away from the soil layer to be sampled.

[0031] Step S4: Place the silty soil sample extraction device vertically on a horizontal ground, disassemble the soil-holding cylinder from the outer ring cutter, lift the soil-holding cylinder upwards, cover the undisturbed soil with the rubber membrane, and cut the rubber membrane to seal the undisturbed soil.

[0032] Compared with related technologies, the silty soil sample extraction device and method of the present invention, wherein the silty soil sample extraction device is formed by fitting one end of the outer ring cutter onto the soil-containing cylinder and forming a detachable and fixed connection with the soil-containing cylinder, and installing the soil cutter on the inner side of the outer ring cutter, located below the connection between the soil-containing cylinder and the outer ring cutter; this structure allows the outer ring cutter to communicate with the soil-containing cylinder, and the soil cutter on the inner side of the outer ring cutter does not affect the original soil structure of the sample, prevents soil from falling off while cutting, and minimizes disturbance to the soil sample, thus better ensuring the originality of the soil sample and maintaining the good original soil structure. The silty soil sample extraction device is formed by inserting the soil pressing rod into the soil-containing cylinder and forming a sliding connection with the soil-containing cylinder; this structure allows the original soil structure of the sample to be maintained by operating the soil pressing rod during sampling, while being easy to operate and highly controllable. The silty soil sample extraction device consists of a rubber membrane sleeved around the outside of a soil-holding cylinder, with the bottom of the rubber membrane attached to the connection between the soil-holding cylinder and the outer ring cutter. This structure ensures that the outer ring cutter and the soil cutter can cut the soil sample downwards while protecting the rubber membrane sleeve. More preferably, the rubber membrane sleeve can directly seal the soil sample, allowing for direct triaxial compression testing of the undisturbed soil, thus maintaining the good structure of the extracted undisturbed soil and achieving high sampling efficiency. Therefore, the silty soil sample extraction device and method of the present invention are simple in structure, easy to operate, highly controllable, maintain the good structure of the extracted undisturbed soil, and achieve high sampling efficiency. Attached Figure Description

[0033] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. In the drawings,

[0034] Figure 1This is a three-dimensional structural schematic diagram of the silty soil sample extraction device according to an embodiment of the present invention;

[0035] Figure 2 This is a partial three-dimensional exploded view of the silty soil sample extraction device according to an embodiment of the present invention.

[0036] Figure 3 for Figure 2 A schematic diagram of the anatomical structure of part A in the middle;

[0037] Figure 4 This is a schematic diagram showing the structural relationship between the platform section and the soil cutter of the silty soil sample extraction device according to an embodiment of the present invention;

[0038] Figure 5 This is a flowchart of the silty soil sample extraction method according to an embodiment of the present invention. Detailed Implementation

[0039] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] The specific embodiments / examples described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein, all of which are within the protection scope of the present invention.

[0041] The present invention provides a silty soil sample extraction device 100.

[0042] Please also refer to Figure 1-2 As shown, Figure 1 This is a three-dimensional structural schematic diagram of the silty soil sample extraction device 100 according to an embodiment of the present invention; Figure 2 This is a partial three-dimensional exploded view of the silty soil sample extraction device 100 according to an embodiment of the present invention.

[0043] Specifically, the silty soil sample extraction device 100 includes a soil-containing cylinder 1, an outer ring cutter 2, a soil cutter 3, a soil-pressing rod 4, and a rubber membrane (not shown).

[0044] The soil-containing cylinder 1 is used to contain undisturbed silty soil obtained from the outside. The soil-containing cylinder 1 has a hollow columnar structure.

[0045] The soil-holding cylinder 1 includes a hollow cylindrical body 11 and an annular handle 12 extending from one end of the cylinder 11 away from the outer ring cutter 2.

[0046] The end of the cylinder 11 away from the annular handle 12 is connected to the outer ring cutter 2 by a threaded connection to form a detachable and fixed connection.

[0047] The ring handle 12 is used by the operator to hold and facilitate pressing down and lifting the silty soil sample extraction device 100.

[0048] The outer ring cutter 2 is used to press the undisturbed soil into the soil-holding cylinder 1 by pressing it into the soil layer to be sampled.

[0049] The outer ring cutter 2 has a hollow columnar structure.

[0050] One end of the outer ring cutter 2 is sleeved on the soil-holding cylinder 1 and forms a detachable and fixed connection with the soil-holding cylinder 1.

[0051] Please refer to Figure 3 As shown, Figure 3 for Figure 2 A schematic diagram of the anatomical structure of part A in the middle.

[0052] Specifically, the outer ring cutter 2 includes a hollow cylindrical outer ring cutter head 21, a hollow cylindrical outer ring cutter tube 22 extending from the outer ring cutter head 21, an annular groove 23 formed by radial indentation of the inner circumference of the platform portion 221, a tubular channel 24 penetrating the outer wall 222 of the cutter tube along the axial direction of the outer ring cutter 2, and a spherical handle 25 disposed on the outer side of the outer wall 222 of the cutter tube.

[0053] In this embodiment, the outer diameter of the outer ring cutter head 21 gradually decreases from one end near the outer ring cutter cylinder 22 to the other end. This structure facilitates the insertion of the outer ring cutter head 2 into the soil layer to be sampled.

[0054] In this embodiment, the outer ring cutter head 21 is welded to the outer ring cutter cylinder 22, which serves to protect the rubber membrane installed inside and ensure that the ball handle 25 can smoothly lift the end of the nylon rope used for cutting in the soil cutter 3.

[0055] The outer ring cutter barrel 22 includes an annular platform portion 221 extending from the outer ring cutter head 21, an outer wall 222 extending axially from the outer periphery of the platform portion 221 away from the outer ring cutter head 21, and an inner wall 223 extending axially from the inner periphery of the platform portion 221 away from the outer ring cutter head 21. The outer wall 222 and the inner wall 223 are spaced apart from each other.

[0056] The platform portion 221 has an annular support platform 2211 at one end away from the outer ring cutter head 21. The support platform 2211 is connected to the outer wall 222 of the cutter barrel and the inner wall 223 of the cutter barrel. In this embodiment, the width of the support platform 2211 is 8cm.

[0057] The outer circumference of the inner wall 223 of the cutter tube is provided with an internal thread, and the inner circumference of the end of the cylinder 11 away from the soil pressing rod 4 is provided with an external thread that matches the internal thread. The end of the cylinder 11 away from the annular handle 12 is inserted between the outer wall 222 and the inner wall 223 of the cutter tube and connected by a threaded structure formed by the internal and external threads. The rubber membrane is attached to the support platform 2211. This structure facilitates downward cutting of soil samples and protects the rubber sheath.

[0058] One end of the tubular channel 24 is connected to the groove 23; the other end of the tubular channel 24 extends to the outside of the outer ring cutter 2.

[0059] The soil cutter 3 is used to cut and support the undisturbed soil collected into the soil container 1. The soil cutter 3 is installed inside the outer ring cutter 2 and is located below the connection between the soil container 1 and the outer ring cutter 2. In this embodiment, the soil cutter 3 is installed 1 cm below the support platform 2211 of the outer ring cutter 2.

[0060] Please refer to Figure 4 As shown, Figure 4 This is a schematic diagram showing the structural relationship between the platform section 221 and the soil cutter 3 of the silty soil sample extraction device according to an embodiment of the present invention.

[0061] Specifically, the soil cutter 3 includes steel balls 31 and a dividing mesh 32.

[0062] The steel ball 31 comprises a plurality of balls. The steel ball 31 is installed in the groove 23 and forms a sliding connection with the groove 23.

[0063] In this embodiment, the groove 23 comprises multiple interconnected annular tubes, each with a circular arc cross-section. The diameter of each annular tube segment differs from the diameters of the two adjacent segments. Each annular tube segment contains at least one steel ball 31 with a matching diameter.

[0064] The groove 23 comprises six sequentially connected annular tubes, the diameters of which are 5.0 mm, 4.5 mm, 4.0 mm, 3.5 mm, 4.0 mm, and 4.5 mm, respectively. The steel balls 31 comprise three first steel balls with a diameter of 5.0 mm, two second steel balls with a diameter of 4.5 mm, two third steel balls with a diameter of 4.0 mm, and two fourth steel balls with a diameter of 3.5 mm. Figure 4 The six annular tubes, arranged clockwise, have diameters of 5mm (45°), 4.5mm (45°), 4mm (45°), 3.5mm (45°), 3.5mm (45°), 4mm (45°), 4.5mm (45°), and 5mm (45°). The outer side of the groove 23 is 2mm away from the inner wall 223 of the cutter tube, connected by a 1mm wide gap. The groove 23, with its six annular tubes, separates the steel balls 31 of different diameters and acts as a sliding groove to ensure the smooth deployment of the dividing mesh 32. Before each insertion of the outer ring cutter 2 into the soil, the nylon thread from the pre-prepared dividing mesh 32 is tucked into the groove 23 using tweezers to facilitate proper dividing during subsequent soil removal.

[0065] The dividing mesh 32 passes through the groove 23 and is fixed to the steel ball 31. The dividing mesh 32 is composed of multiple nylon ropes, and the nylon ropes extend through the tubular channel 24 to connect with the spherical handle 25.

[0066] Specifically, the dividing net 32 ​​includes three nylon ropes. Two of the nylon ropes are fixed to multiple steel balls 31 by zigzag connections to form a mesh structure. The third nylon rope is located within the groove 23 and sequentially connects the steel balls 31 before extending through the tubular channel 24 to connect with the spherical handle 25. This structure facilitates the operator in lifting the soil cutter 3, enabling the division and support of the undisturbed soil. The dividing net 32 ​​prevents soil from falling during cutting and minimizes disturbance to the soil sample, thus better preserving its original state.

[0067] The soil-pressing rod 4 is used to fix the position of the undisturbed soil in the soil-holding cylinder 1 and to push the undisturbed soil out of the soil-holding cylinder 1.

[0068] The soil-pressing rod 4 is inserted into the soil-holding cylinder 1 and forms a sliding connection with the soil-holding cylinder 1.

[0069] Specifically, the soil pressing rod 4 includes a pressing rod 42, a cylindrical soil pressing cake 41 fixedly connected to both ends of the pressing rod 42, and a spherical handle 43.

[0070] The soil compaction cake 41 is fitted and housed within the cylinder 11, forming a sliding connection. In this embodiment, the diameter of the soil compaction cake 41 is slightly smaller than the diameter of the cylinder 11. When the silty soil sample extraction device 100 is pressed down, the undisturbed soil occupies the internal space of the cylinder 11. The gap between the soil compaction cake 41 and the cylinder 11 allows air to escape, thereby making the silty soil sample extraction device 100 easy to operate and highly controllable.

[0071] By manipulating the soil compaction cake 41, the undisturbed soil can be fixed inside the outer ring cutter 2 to form a soil sample, preventing the soil sample from moving upwards during the upward pulling of the cylinder 11. This structure ensures that the extracted undisturbed soil structure is well maintained and that the sampling efficiency is high.

[0072] The pressure rod 42 is inserted into the cylinder 11 from the end of the cylinder 11 away from the outer ring cutter 2. Specifically, the end of the cylinder 11 away from the outer ring cutter 2 is an open end of the cylinder 11, which is located at the same end as the annular handle 12.

[0073] The spherical handle 43 is threadedly connected to the pressure rod 42 and is located outside the cylinder 11.

[0074] When assembling the silty soil sample extraction device 100, the spherical handle 43 is threadedly connected to the pressure rod 42 for easy gripping by the operator. When the silty soil sample extraction device 100 is pressed down, one operator needs to lift the pressure rod 42 to avoid disturbing the soil in the cylinder 11. This structure makes it easy for the operator to use, thereby improving sampling efficiency.

[0075] The rubber membrane is used to load the undisturbed soil pushed out from the soil-holding cylinder 1. The rubber membrane is fitted over the outside of the soil-holding cylinder 1, and its bottom is attached to the connection between the soil-holding cylinder 1 and the outer ring cutter 2. The end of the rubber membrane near the outer ring cutter 2 is attached and fixed to the support platform 2211. The rubber membrane directly seals the soil sample, thereby directly conducting a triaxial compression test on the undisturbed soil. This structure ensures that the extracted undisturbed soil structure is well maintained and that the sampling efficiency is high.

[0076] In this embodiment, along the length extension direction of the silty soil sample extraction device 100, the length of the rubber membrane is longer than the length of the cylinder 11, and the portion of the rubber membrane extending beyond the cylinder 11 is attached and fixed to the connection between the soil-holding cylinder 1 and the outer ring cutter 2. The length of the portion of the rubber membrane extending beyond the cylinder 11 is 1 cm.

[0077] In this embodiment, the silty soil sample extraction device 100 further includes double-sided adhesive tape, and the rubber membrane is attached to the support platform 2211 by the double-sided adhesive tape. The double-sided adhesive tape covers a 1cm length range of the difference portion at the lower end of the rubber membrane.

[0078] In this embodiment, the soil-holding cylinder 1 further includes lubricating oil disposed between the cylinder body 11 and the rubber membrane. The lubricating oil is used to reduce the friction between the cylinder body 11 and the rubber membrane, thereby improving reliability and ease of operation.

[0079] The present invention also provides a method for extracting silty soil samples.

[0080] The method for extracting silty soil samples is applied to the silty soil sample extraction device 100.

[0081] Please refer to Figure 5 As shown, Figure 5 This is a flowchart of the silty soil sample extraction method according to an embodiment of the present invention.

[0082] Specifically, the method for extracting silty soil samples includes:

[0083] Step S1: Assemble the soil-holding cylinder 1, the outer ring cutter 2, the soil cutter 3, the soil-pressing rod 4, and the rubber membrane to form the silty soil sample extraction device 100.

[0084] In this embodiment, the silty soil sample extraction device 100 requires two operators to work together during actual use. Step S1 is initiated after the pressure point of the soil layer to be sampled is determined and calibrated.

[0085] Step S2: The silty soil sample extraction device 100 is perpendicular to and pressed downwards onto the soil layer to be sampled, while the soil pressing rod 4 is pressed down and slid to the connection position between the soil holding cylinder 1 and the outer ring cutter 2.

[0086] In this embodiment, one operator holds the spherical handle 43 to prevent it from falling and keeps the soil compaction cake 41 level with the top of the soil container 1. Another operator holds the annular handle 12 and slowly presses down the entire silty soil sample extraction device 100 to push it into the stratum, controlling the pressure and direction to ensure that the silty soil is not disturbed during pressing.

[0087] Step S3: When the silty soil sample extraction device 100 stops pressing down, the soil cutter 3 divides and supports the original soil, keeps the soil pressing rod 4 pressed down to the connection position between the soil holding cylinder 1 and the outer ring cutter 2, and lifts the silty soil sample extraction device 100 away from the soil layer to be sampled.

[0088] In this embodiment, after the outer ring cutter 2 is drilled to the required depth, the downward pressure of the silty soil sample extraction device 100 is stopped. The nylon rope connected to it is pulled by the spherical handle 25, causing the dividing net 32 ​​to cut the soil. After the nylon rope is fixed, the silty soil sample extraction device 100 is slowly lifted.

[0089] Step S4: Place the silty soil sample extraction device 100 vertically on a horizontal ground, disassemble the soil holding cylinder 1 from the outer ring cutter 2 and lift the soil holding cylinder 1 upwards, cover the undisturbed soil with the rubber membrane and cut the rubber membrane to seal the undisturbed soil.

[0090] In this embodiment, when the outer ring cutter head 21 of the outer ring cutter 2 is exposed on the ground surface, it is fixed with a fixing instrument to keep the silty soil sample extraction device 100 in a vertical state. An operator operating the soil pressing rod 4 slowly moves the soil pressing rod 4 to the top of the soil sample, while lifting the soil holding cylinder 1. Two prefabricated sleeves are installed on the outside of the rubber sleeve. The rubber sleeve and the soil sample are cut with a steel sheet, and the soil sample is taken out and sealed.

[0091] It is understood that the contents of the above-described embodiments of the silty soil sample extraction device 100 are all applicable to the embodiments of the silty soil sample extraction method. The specific functions implemented by the embodiments of the silty soil sample extraction method of the present invention are the same as those of the above-described embodiments of the silty soil sample extraction device 100, and the beneficial effects achieved are also the same as those achieved by the above-described embodiments of the silty soil sample extraction device 100.

[0092] Compared with related technologies, the silty soil sample extraction device and method of the present invention, wherein the silty soil sample extraction device is formed by fitting one end of the outer ring cutter onto the soil-containing cylinder and forming a detachable and fixed connection with the soil-containing cylinder, and installing the soil cutter on the inner side of the outer ring cutter, located below the connection between the soil-containing cylinder and the outer ring cutter; this structure allows the outer ring cutter to communicate with the soil-containing cylinder, and the soil cutter on the inner side of the outer ring cutter does not affect the original soil structure of the sample, prevents soil from falling off while cutting, and minimizes disturbance to the soil sample, thus better ensuring the originality of the soil sample and maintaining the good original soil structure. The silty soil sample extraction device is formed by inserting the soil pressing rod into the soil-containing cylinder and forming a sliding connection with the soil-containing cylinder; this structure allows the original soil structure of the sample to be maintained by operating the soil pressing rod during sampling, while being easy to operate and highly controllable. The silty soil sample extraction device consists of a rubber membrane sleeved around the outside of a soil-holding cylinder, with the bottom of the rubber membrane attached to the connection between the soil-holding cylinder and the outer ring cutter. This structure ensures that the outer ring cutter and the soil cutter can cut the soil sample downwards while protecting the rubber membrane sleeve. More preferably, the rubber membrane sleeve can directly seal the soil sample, allowing for direct triaxial compression testing of the undisturbed soil, thus maintaining the good structure of the extracted undisturbed soil and achieving high sampling efficiency. Therefore, the silty soil sample extraction device and method of the present invention are simple in structure, easy to operate, highly controllable, maintain the good structure of the extracted undisturbed soil, and achieve high sampling efficiency.

[0093] It should be noted that the various embodiments described above with reference to the accompanying drawings are merely illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be included within the scope of the present invention. Furthermore, unless the context otherwise requires, words appearing in the singular include those in the plural, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. A device for extracting a sample of a clayey soil, characterized in that it comprises: The device comprises: a soil containing cylinder for containing the silt soil obtained from outside; the soil containing cylinder is in a hollow cylindrical structure; an outer ring cutter for pressing into the soil layer to be sampled to press the undisturbed soil into the soil containing cylinder; the outer ring cutter is in a hollow cylindrical structure, and one end of the outer ring cutter is sleeved on the soil containing cylinder and is detachably fixedly connected with the soil containing cylinder; a soil cutter installed on the inner side of the outer ring cutter and below the connection between the soil containing cylinder and the outer ring cutter for cutting and supporting the undisturbed soil collected into the soil containing cylinder; a soil pressing rod for fixing the position of the undisturbed soil in the soil containing cylinder and for pushing the undisturbed soil out of the soil containing cylinder; the soil pressing rod is inserted into the soil containing cylinder and is in sliding connection with the soil containing cylinder; and a rubber film for loading the undisturbed soil pushed out of the soil containing cylinder; the rubber film is sleeved on the outer side of the soil containing cylinder, and the bottom of the rubber film is attached to the connection between the soil containing cylinder and the outer ring cutter; the soil containing cylinder comprises a hollow cylindrical cylinder body and an annular handle extending from one end of the cylinder body away from the outer ring cutter; one end of the cylinder body away from the annular handle is connected with the outer ring cutter through a threaded structure to form a detachable fixed connection; the outer ring cutter comprises a hollow cylindrical cutter head and a hollow cylindrical cutter cylinder extending from the cutter head; the outer diameter of the cutter head gradually decreases from one end close to the cutter cylinder to the other end; the cutter cylinder comprises a ring-shaped platform extending from the cutter head, a cutter outer wall extending from the outer circumferential side of the platform in the axial direction away from the cutter head, and a cutter inner wall extending from the inner circumferential side of the platform in the axial direction away from the cutter head; the cutter outer wall and the cutter inner wall are spaced apart from each other; one end of the platform away from the cutter head is provided with a ring-shaped support platform, and the support platform is connected with the cutter outer wall and the cutter inner wall respectively; the inner circumferential side of the cutter inner wall is provided with an internal thread, and the inner circumferential side of one end of the cylinder body away from the annular handle is provided with an external thread matched with the internal thread; one end of the cylinder body away from the annular handle is inserted between the cutter outer wall and the cutter inner wall and is connected through the internal thread and the external thread to form a threaded structure connection, and one end of the rubber film close to the outer ring cutter is attached and fixed to the support platform; the outer ring cutter further comprises a ring-shaped groove recessed from the inner circumferential side of the platform in the radial direction, a tubular passage penetrating through the cutter outer wall in the axial direction of the outer ring cutter, and a spherical handle provided on the outer side of the cutter outer wall; one end of the tubular passage communicates with the groove, and the other end of the tubular passage extends to the outer side of the outer ring cutter; the soil cutter comprises a plurality of steel balls installed in the groove and in sliding connection with the groove, and a cutting net passing through the groove and fixed to the steel balls; the cutting net is composed of a plurality of nylon ropes, and the nylon ropes extend to the spherical handle through the tubular passage. The partition net comprises three nylon ropes, two of which are fixed to the steel balls in a zigzag manner to form a net structure, and the other is located in the groove and sequentially connects the steel balls and extends to the spherical handle through the tubular channel; The groove comprises a plurality of annular tubes connected in sequence, the cross section of the annular tube is a circular arc, the diameter of each annular tube is different from that of the adjacent two annular tubes; each annular tube contains at least one steel ball with a matching diameter.

2. The device for extracting a sample of a clayey soil according to claim 1, characterized in that, The soil pressing rod comprises a pressing rod, a cylindrical soil pressing cake and a spherical handle fixedly connected to both ends of the pressing rod respectively; The soil pressing cake matches the cylinder and is accommodated in the cylinder to form a sliding connection; The pressing rod is inserted into the cylinder from the end of the cylinder away from the outer ring cutter; The spherical handle is threadedly connected with the pressing rod and located outside the cylinder.

3. The device of claim 1, wherein The length of the rubber film is longer than the length of the cylinder along the length extension direction of the silt sample extraction device, and the part of the rubber film exceeding the cylinder is fixedly attached to the connection between the soil containing cylinder and the outer ring cutter.

4. A method for extracting a sample of a clayey soil, characterized in that, The method is applied to the silt sample extraction device as claimed in any one of claims 1-3; the method comprises: Step S1, installing the soil containing cylinder, the outer ring cutter, the soil cutter, the soil pressing rod and the rubber film into the silt sample extraction device; Step S2, vertically pressing the silt sample extraction device downward to the soil layer to be sampled, and simultaneously pressing and sliding the soil pressing rod to the connection position between the soil containing cylinder and the outer ring cutter; Step S3, when the silt sample extraction device stops pressing, the soil cutter divides and supports the undisturbed soil, keeps the soil pressing rod pressed to the connection position between the soil containing cylinder and the outer ring cutter, and lifts the silt sample extraction device away from the soil layer to be sampled; Step S4, placing the silt sample extraction device vertically on the ground, disassembling the soil containing cylinder and the outer ring cutter, lifting the soil containing cylinder upward, sleeving the rubber film on the undisturbed soil, and cutting the rubber film to seal the undisturbed soil.

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