Using devices that are highly susceptible to disturbing undisturbed soil samples.

Abstract

This invention provides an apparatus for taking easily disturbed undisturbed soil samples. The apparatus includes a square shock-absorbing outer box and a cylindrical sampling inner cylinder. The cylindrical sampling inner cylinder is placed inside the square shock-absorbing outer box. The cylindrical sampling inner cylinder and the square shock-absorbing outer box are connected by a shock-absorbing device. The square shock-absorbing outer box includes a shock-absorbing outer box body and a shock-absorbing outer box cover. The bottom of the shock-absorbing outer box body is closed and the top is open. The top of the shock-absorbing outer box cover is closed and the bottom is open. The shock-absorbing outer box is placed horizontally, and liquid temperature-sensitive hydrogel is introduced through the shock-absorbing solution inlet until the temperature-sensitive hydrogel overflows from the shock-absorbing solution outlet, at which point the shock-absorbing solution inlet is sealed. A constant temperature heating rod is placed through the shock-absorbing solution outlet, and the temperature of the constant temperature heating rod is controlled to cause the temperature-sensitive hydrogel to condense, at which point the shock-absorbing solution outlet is sealed.

Description

[0001] This application is a divisional application. The parent application is entitled "An apparatus and method for taking easily disturbed undisturbed soil samples", application number: 202310376438.9, application date: April 10, 2023. Technical Field

[0002] This invention relates to the field of geotechnical engineering, and more particularly to an apparatus and method for taking undisturbed soil samples. Background Technology

[0003] Obtaining the physical and mechanical properties of in-situ soil and rock materials is of significant engineering importance for the design, construction, and subsequent maintenance of geotechnical engineering projects. For soil and rock materials with stable and robust interparticle bonds, such as loess, expansive soil, and rock, large blocks can be directly sampled on-site, cut, tightly wrapped, and transported to the laboratory for in-situ testing to obtain their physical and mechanical properties. However, for soil and rock materials with extremely weak interparticle bonds, such as sand and volcanic ash, disturbance during sampling and transportation can easily occur, disrupting the initial structure of the undisturbed soil, causing it to loosen or even liquefy, making it impossible to obtain its physical and mechanical properties in the laboratory. Therefore, sampling methods for easily disturbed undisturbed soil have always been a technical challenge.

[0004] To accurately obtain the physical and mechanical properties of easily disturbed undisturbed soil samples, the main measures currently adopted are: 1. Transporting indoor instruments to the field for testing, but this method consumes a great deal of manpower, material resources, and financial resources, and is not suitable for testing using high-precision large-scale instruments and equipment; 2. Preparing undisturbed samples on-site and fixing them tightly with metal molds that fit the sample size, but this method has an extremely high sample loss rate during transportation.

[0005] Therefore, there is a need to design specialized sampling devices and methods for easily disturbed undisturbed soil. For example, Chinese utility model patent CN202020349433.9 discloses an on-site undisturbed sand sampler. This invention designs a handle, outer cylinder, push rod, sampling cylinder, and blade opening and closing valve. After sand sampling is completed, the lower end of the sampling cylinder is sealed by closing the blade opening valve to ensure that sand does not leak back during the sampling process. Another example is Chinese utility model patent CN202221965707.2, which discloses a novel undisturbed sandy soil sampling and packaging device. This invention designs a double-layered square sampling device consisting of multiple sampling inner cylinders and a sampling outer shell. By setting hollow areas between the inner cylinders and the outer shell, and using a folding track and fixed pulley system, the sand is kept as undisturbed as possible during the sampling process. Yet another example is Chinese invention patent CN202110719777.3, which discloses a sampling and solidification system and method for undisturbed sand. This invention includes a sampling bracket, a sampling tube, a permeation cylinder, a storage cylinder, and a curing oven. The undisturbed sand sample is pre-cured using a temperature-sensitive resin to ensure that the initial structure of the sand remains unchanged, thus preserving the undisturbed sand sample for a long time.

[0006] Existing publicly available technologies mainly focus on simplifying the sampling process and avoiding disturbance of soil samples during sampling, designing related instruments and methods. However, the damage to the initial soil structure, which is easily disturbed, occurs more frequently during sample transportation. Alternatively, a curing agent can be injected into the pores of the soil sample to pre-cur it, but this method cannot obtain the physical and mechanical properties of in-situ sand samples.

[0007] Therefore, those skilled in the art are dedicated to developing an apparatus and method for taking easily disturbed undisturbed soil samples. Summary of the Invention

[0008] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to simplify the sampling operation of undisturbed soil that is easily disturbed, and to ensure that the undisturbed soil sample is not disturbed during sampling and transportation.

[0009] To achieve the above objectives, the present invention provides a device for taking easily disturbed undisturbed soil samples. The device includes a square shock-absorbing outer box and a cylindrical sampling inner cylinder. The cylindrical sampling inner cylinder is placed inside the square shock-absorbing outer box. The cylindrical sampling inner cylinder and the square shock-absorbing outer box are connected by a shock-absorbing device.

[0010] The square shock-absorbing outer box completes the sealing of the original soil sample. It includes a shock-absorbing outer box body and a shock-absorbing outer box cover. The bottom of the shock-absorbing outer box body is closed and the top is open. The top of the shock-absorbing outer box cover is closed and the bottom is open. The shock-absorbing outer box cover is tightly fastened to the shock-absorbing outer box body by a fastening device.

[0011] The cylindrical sampling inner cylinder completes the sampling and sealing of undisturbed soil samples. It includes two half-cylinder surfaces and two sampling inner cylinder top covers. The two half-cylinder surfaces can be spliced ​​together to form a cylindrical cylinder with a completely open bottom and top surface. The top cover of the sampling inner cylinder is closed at the top and open at the bottom. The two sampling inner cylinder top covers are tightly fastened to the top and bottom of the two half-cylinder surfaces by fastening devices.

[0012] Furthermore, the upper cover of the shock-absorbing outer box and the main body of the shock-absorbing outer box are tightly connected by bolts, and a sealing rubber gasket is provided at the contact position between the upper cover of the shock-absorbing outer box and the main body of the shock-absorbing outer box; the top covers of the two sampling inner cylinders are tightly connected to the two half-cylinder surfaces by bolts, and a sealing rubber gasket is provided at the contact position between the top cover of the sampling inner cylinder and the cylinder surface.

[0013] Furthermore, a cylindrical first shock-absorbing bracket and a first shock-absorbing spring are provided at the center of the bottom surface and the four sides inside the shock-absorbing outer box body. One end of the first shock-absorbing spring is fixed to the first shock-absorbing bracket, and the other end of the first shock-absorbing spring is a free end. A cylindrical second shock-absorbing bracket and a second shock-absorbing spring are provided at the center of the top inside the shock-absorbing outer box cover. One end of the second shock-absorbing spring is fixed to the second shock-absorbing bracket, and the other end of the second shock-absorbing spring is a free end.

[0014] Furthermore, a shock-absorbing solution inlet is provided on the bottom side of the main body of the shock-absorbing outer box, and a shock-absorbing solution outlet is provided on the top of the cover of the shock-absorbing outer box.

[0015] Furthermore, the inner bottom surface of the main body of the shock-absorbing outer box is 400×400mm², the inner height is 500mm, and the thickness is 4mm; the inner top surface of the upper cover of the shock-absorbing outer box is 408×408mm², the inner height is 50mm, and the thickness is 4mm; the first shock-absorbing bracket has a height of 30mm, an outer diameter of 40mm, and a thickness of 4mm; the second shock-absorbing bracket has a height of 30mm, an outer diameter of 40mm, and a thickness of 5mm.

[0016] Furthermore, the half-side cylinder surface includes two fan-shaped cylindrical third shock-absorbing supports. The center height of the third shock-absorbing support is set at the center position of the half-side cylinder surface, and the horizontal position of the third shock-absorbing support is set at the center angle of the half-side cylinder surface at 45° and 135° clockwise. The top cover of the sampling inner cylinder is provided with a fourth shock-absorbing support, which is located at the center of the outer top surface of the top cover of the sampling inner cylinder.

[0017] Furthermore, the cylindrical tube after the two half-side cylinders are spliced ​​together has a height of 300mm, an inner diameter of 200mm, and a thickness of 4mm; the inner top surface diameter of the sampling inner cylinder top cover is 208mm, the inner height is 50mm, and the thickness is 4mm; the height of the third shock-absorbing bracket and the fourth shock-absorbing bracket is 50mm, the outer diameter is 40mm, and the thickness is 5mm.

[0018] On the other hand, the present invention also provides a method for taking easily disturbed undisturbed soil samples, characterized in that the above-mentioned device for taking easily disturbed undisturbed soil samples is used to take the undisturbed soil samples, and the method includes the following steps:

[0019] S101: Apply petroleum jelly to the inner surfaces of the two half-cylinder surfaces and the inner surfaces of the top covers of the two sampling inner cylinders, and take the undisturbed soil samples.

[0020] S103: Securely fasten the top cover of the sampling inner cylinder to the top and bottom of the two half-cylinder surfaces, tighten the fixing screws, and apply Vaseline to the contact area;

[0021] S105: Align the fourth shock-absorbing bracket at the bottom of the cylindrical sampling inner cylinder with the free end of the first shock-absorbing spring at the bottom of the shock-absorbing outer box body, align the lower notch of the third shock-absorbing bracket on the side of the cylindrical sampling inner cylinder with the free end of the first shock-absorbing spring on the side of the shock-absorbing outer box body, and press down the cylindrical sampling inner cylinder so that the cylindrical sampling inner cylinder is supported by the first shock-absorbing spring.

[0022] S107: Align the free end of the second shock-absorbing spring on the upper cover of the shock-absorbing outer box with the fourth shock-absorbing bracket at the top of the cylindrical sampling inner cylinder, and secure the upper cover of the shock-absorbing outer box tightly to the top of the main body of the shock-absorbing outer box with screws and tighten them.

[0023] S109: Place the shock-absorbing outer box horizontally, introduce liquid temperature-sensitive hydrogel into the shock-absorbing solution inlet until the temperature-sensitive hydrogel overflows from the shock-absorbing solution outlet, and seal the shock-absorbing solution inlet; place a constant temperature heating rod into the shock-absorbing solution outlet, control the temperature of the constant temperature heating rod to make the temperature-sensitive hydrogel form a condensed state, and seal the shock-absorbing solution outlet.

[0024] S111: Transport the device to the laboratory and store it in an environment of 30-35℃;

[0025] S113: When using soil samples, remove the cylindrical sampling inner cylinder from the square shock-absorbing outer box, and remove the top covers of the two sampling inner cylinders and the two half-side cylinder surfaces.

[0026] Further, step S101 includes the following steps:

[0027] S1011: Determine the location where soil samples will be taken. First, use a shovel to remove the surface soil to expose a fresh cross-section. Excavate to a depth of approximately 0.5m.

[0028] S1012: Use a shovel to carve out the approximate outline of the sample to be taken at the top, left, right, front and back of the proposed sampling location, and gently place the two half-cylinder surfaces that form a cylinder on the top of the proposed soil sample.

[0029] S1013: Use a thin-cutting soil cutter to cut a soil sample slightly larger than the half-side cylinder surface along the periphery of the half-side cylinder surface, and press the half-side cylinder surface vertically downward.

[0030] S1014: Repeat step S1013 until the soil sample extends beyond the upper edge of the half-side cylinder surface, and then smooth the upper and lower parts of the soil sample on the half-side cylinder surface.

[0031] Furthermore, in step S109, the temperature of the heating rod is controlled to 35°C, so that the thermosensitive hydrogel forms a condensed state; the thermosensitive hydrogel is Pluronic F127 thermosensitive hydrogel, and the heating power of the constant temperature heating rod is 200W.

[0032] In a preferred embodiment of the present invention, the present invention has the following advantages over the prior art:

[0033] 1. The device for taking undisturbed soil samples provided by the present invention is designed with a double-layer soil sampling device. The inner cylinder and the outer box are connected by a shock absorber and filled with temperature-sensitive hydrogel to ensure that the undisturbed soil sample is not disturbed during sampling and transportation, and to ensure that the initial structure of the undisturbed soil is not destroyed, so that the physical and mechanical properties can be obtained indoors.

[0034] 2. This invention can sample undisturbed soil that is easily disturbed. It is simple to operate and can be widely used.

[0035] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0036] Figure 1 A schematic diagram of a device for taking easily disturbed undisturbed soil samples according to a preferred embodiment of the present invention;

[0037] Figure 2 This is a cross-sectional schematic diagram of a preferred embodiment of the present invention for taking undisturbed soil samples;

[0038] Figure 3 This is a schematic diagram of the shock-absorbing outer box body according to a preferred embodiment of the present invention;

[0039] Figure 4This is a cross-sectional schematic diagram of the shock-absorbing outer box body according to a preferred embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the shock-absorbing outer box cover of a preferred embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the cylindrical sampling inner cylinder of a preferred embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of a half-side cylinder surface according to a preferred embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the top surface of the sampling inner cylinder cover according to a preferred embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the bottom surface of the top cover of the sampling inner cylinder according to a preferred embodiment of the present invention;

[0045] Figure 10 This is a flowchart illustrating a preferred embodiment of the present invention for taking easily disturbed undisturbed soil samples.

[0046] Among them, 1-shock-absorbing outer box body, 2-shock-absorbing outer box top cover, 3a-shock-absorbing solution inlet, 3b-shock-absorbing solution outlet, 4a-first bolt hole, 4b-second bolt hole, 5a-first shock-absorbing bracket, 5b-first shock-absorbing spring, 6a-second shock-absorbing bracket, 6b-second shock-absorbing spring, 7-half side cylinder surface, 8-sampling inner cylinder top cover, 9-third shock-absorbing bracket, 10a-third bolt hole, 10b-bolt hole, 11-fourth shock-absorbing bracket. Detailed Implementation

[0047] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0048] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0049] like Figure 1 , Figure 2As shown in the figure, an embodiment of the present invention provides a device for taking easily disturbed undisturbed soil samples, including a square shock-absorbing outer box and a cylindrical sampling inner cylinder. The cylindrical sampling inner cylinder is placed inside the square shock-absorbing outer box, and the cylindrical sampling inner cylinder and the square shock-absorbing outer box are connected by a shock-absorbing device. This device is designed with a double-layer soil sampling device, with the cylindrical sampling inner cylinder and the square shock-absorbing outer box connected by a shock absorber and filled with temperature-sensitive hydrogel, so as to achieve sampling of easily disturbed undisturbed soil. The operation is simple and ensures that the undisturbed soil sample is not disturbed during sampling and transportation.

[0050] like Figure 1 , Figure 2 The square shock-absorbing outer box seals the undisturbed soil sample. It includes a main body 1 and a top cover 2. The main body 1 is closed at the bottom and open at the top; the top cover 2 is closed at the top and open at the bottom. The top cover 2 is tightly fastened to the main body 1 using a fastening device. The main body 1 and the top cover 2 are tightly connected by bolts, with two bolts evenly spaced on each side of the outer box, for a total of eight bolts. At the corresponding bolt positions, the main body 1 and the top cover 2 are respectively provided with a first bolt hole 4a and a second bolt hole 4b. A shock-absorbing solution inlet 3a is provided on the bottom side of the main body 1, and a shock-absorbing solution outlet 3b is provided on the top of the top cover 2. Figure 3 , Figure 4 As shown, a cylindrical first shock-absorbing bracket 5a and a first shock-absorbing spring 5b are installed at the center of the bottom surface and the four sides inside the shock-absorbing outer box body 1. One end of the first shock-absorbing spring 5b is fixed to the first shock-absorbing bracket 5a, and the other end of the first shock-absorbing spring 5b is a free end; as shown Figure 5 As shown, a cylindrical second shock absorber bracket 6a and a second shock absorber spring 6b are arranged at the center of the top of the outer cover 2 of the shock absorber box. One end of the second shock absorber spring 6b is fixed to the second shock absorber bracket 6a, and the other end of the second shock absorber spring 6b is a free end.

[0051] In a preferred embodiment of the present invention, the inner bottom surface of the shock-absorbing outer box body 1 is 400×400mm2, the inner height is 500mm, and the thickness is 4mm; the inner top surface of the shock-absorbing outer box cover 2 is 408×408mm2, the inner height is 50mm, and the thickness is 4mm; the first shock-absorbing bracket 5a has a height of 30mm, an outer diameter of 40mm, and a thickness of 4mm; the second shock-absorbing bracket 6a has a height of 30mm, an outer diameter of 40mm, and a thickness of 5mm.

[0052] like Figure 2 , Figure 6 The cylindrical sampling inner cylinder completes the sampling and sealing of undisturbed soil samples, including two half-cylinder surfaces 7 and two sampling inner cylinder top covers 8. The two half-cylinder surfaces 7 can be spliced ​​together to form a cylindrical cylinder with both the bottom and top surfaces completely open. Figure 7As shown, the top of the sampling inner cylinder cover 8 is closed, while the bottom is open, as... Figure 8 , Figure 9 As shown. The two sampling inner cylinder top covers 8 are tightly fastened to the top and bottom of the two half-cylinder surfaces 7 by fastening devices. The half-cylinder surface 7 includes two fan-shaped cylindrical third shock-absorbing supports 9. The center height of the third shock-absorbing support 9 is set at the center position of the half-cylinder surface 7, and the horizontal position of the third shock-absorbing support 9 is set at the center angle of the half-cylinder surface 7 at 45° and 135° clockwise. The sampling inner cylinder top cover 8 is provided with a fourth shock-absorbing support 11, which is located at the center of the outer top surface of the sampling inner cylinder top cover 8.

[0053] In a preferred embodiment of the present invention, the cylindrical tube after splicing the two half-side cylindrical surfaces 7 has a height of 300mm, an inner diameter of 200mm, and a thickness of 4mm; the inner top surface diameter of the sampling inner cylinder top cover 8 is 208mm, the inner height is 50mm, and the thickness is 4mm; the height of the third shock absorber 9 and the fourth shock absorber 11 is 50mm, the outer diameter is 40mm, and the thickness is 5mm.

[0054] In a preferred embodiment of the present invention, the device for taking easily disturbed undisturbed soil samples provided by the present invention is designed with a double-layer soil sampling device. The inner cylinder and the outer box are connected by a shock absorber and filled with temperature-sensitive hydrogel to ensure that the undisturbed soil sample is not disturbed during sampling and transportation, and to ensure that the initial structure of the undisturbed soil is not destroyed, so that the physical and mechanical properties can be obtained indoors. At the same time, the device for taking easily disturbed undisturbed soil samples can sample easily disturbed undisturbed soil, is simple to operate, and can be widely promoted and used.

[0055] like Figure 10 As shown, this embodiment of the invention provides a method for taking undisturbed soil samples that are easily disturbed. The method uses the apparatus described above for taking undisturbed soil samples and includes the following steps:

[0056] S101: Apply petroleum jelly to the inner surfaces of the two half-side cylinder surfaces 7 and the inner surfaces of the two sampling inner cylinder top covers 8, and take undisturbed soil samples.

[0057] This step specifically includes the following steps:

[0058] S1011: Determine the location where soil samples will be taken. First, use a shovel to remove the surface soil to expose a fresh cross-section. Excavate to a depth of approximately 0.5m.

[0059] S1012: Use a shovel to trim the approximate outline of the sample to be taken at the top, left, right, front and back of the proposed sampling location, and gently place the two half-cylinder surfaces 7, which are formed into a cylinder, on the top of the proposed soil sample.

[0060] S1013: Gently place the two half-cylinder surfaces 7 forming a cylinder at the top of the sample, use a thin-cutting soil knife to cut the soil sample slightly larger than the half-cylinder surface 7 along the periphery of the half-cylinder surface 7, and press the half-cylinder surface 7 vertically down.

[0061] S1014: Repeat step S1013 until the soil sample extends beyond the upper edge of the half-side cylinder 7, and then smooth the upper and lower parts of the soil sample on the half-side cylinder 7.

[0062] S103: Securely fasten the top cover 8 of the sampling inner cylinder to the top and bottom of the two half-cylinder surfaces 7, tighten the fixing screws, and apply Vaseline to the contact area;

[0063] S105: Align the fourth damping bracket 11 at the bottom of the cylindrical sampling inner cylinder with the free end of the first damping spring 5b at the bottom of the damping outer box body 1, align the lower notch of the third damping bracket 9 on the side of the cylindrical sampling inner cylinder with the free end of the first damping spring 5b on the side of the damping outer box body 1, and press down on the cylindrical sampling inner cylinder so that the cylindrical sampling inner cylinder is supported by the first damping spring 5b.

[0064] S107: Align the free end of the second shock-absorbing spring 6b of the shock-absorbing outer box cover 2 with the fourth shock-absorbing bracket 11 at the top of the cylindrical sampling inner cylinder, and tightly fasten the shock-absorbing outer box cover 2 to the top of the shock-absorbing outer box body, and fix and tighten the screws.

[0065] S109: Place the shock-absorbing outer box horizontally, introduce liquid temperature-sensitive hydrogel into the shock-absorbing solution inlet 3a until the temperature-sensitive hydrogel overflows from the shock-absorbing solution outlet 3b, and then seal the shock-absorbing solution inlet 3a; place a constant temperature heating rod into the shock-absorbing solution outlet 3b, control the temperature of the constant temperature heating rod to make the temperature-sensitive hydrogel form a condensed state, and then seal the shock-absorbing solution outlet 3b.

[0066] S111: Transport the device to the laboratory and store it in an environment of 30-35℃;

[0067] S113: When using soil samples, remove the cylindrical sampling inner cylinder from the square shock-absorbing outer box, and remove the top covers 8 and the two half-side cylinder surfaces 7 of the two sampling inner cylinders.

[0068] When controlling the temperature of the thermostatic heating rod, the temperature of the heating rod is set to 35°C, so that the thermosensitive hydrogel forms a condensed state. The thermosensitive hydrogel is preferably Pluronic F127 thermosensitive hydrogel, and the heating power of the thermostatic heating rod is preferably 200W.

[0069] The apparatus and method for taking easily disturbed undisturbed soil samples provided by the embodiments of the present invention can sample easily disturbed undisturbed soil, which is simple to operate, ensures that the undisturbed soil samples are not disturbed during sampling and transportation, and is easy to promote and use.

[0070] The present invention will now be described in detail with reference to preferred embodiments.

[0071] In order to overcome the shortcomings of the prior art, the present invention provides an apparatus and method for taking undisturbed soil samples that are easily disturbed, thus solving the problem of sampling undisturbed soil that is easily disturbed.

[0072] like Figure 1 , Figure 2 As shown, a preferred embodiment of the present invention provides an apparatus for taking easily disturbed undisturbed soil samples, comprising a square shock-absorbing outer box and a cylindrical sampling inner cylinder, the sampling inner cylinder being placed inside the shock-absorbing outer box. The square shock-absorbing outer box includes a shock-absorbing outer box body 1 and a shock-absorbing outer box cover 2. The bottom of the outer box body 1 is closed, and the top is open. The recommended internal bottom dimensions of the body 1 are 400×400mm², the recommended internal height is 500mm, and the recommended thickness is 4mm. The top of the cover 2 is closed, and the bottom is open. The recommended internal top dimensions of the cover 2 are 408×408mm², the recommended internal height is 50mm, and the recommended thickness is 4mm. A shock-absorbing solution inlet 3a is provided on the bottom side of the body 1, with a recommended diameter of 40mm. Figure 3 , Figure 4 As shown, cylindrical first shock-absorbing brackets 5a and first shock-absorbing springs 5b are installed at the center of the bottom surface and four sides of the main body 1. One end of the first shock-absorbing spring 5b is fixed to the first shock-absorbing bracket 5a, and the other end is free. The recommended height of the cylindrical first shock-absorbing bracket 5a is 30mm, the recommended outer diameter is 40mm, and the recommended thickness is 4mm. The upper cover 2 is tightly fastened to the main body 1, and a sealing rubber gasket is installed at the contact point between the two. The main body 1 and the upper cover 2 are tightly connected by bolts, with two bolts evenly spaced on each side of the outer box, for a total of 8 bolts. At the corresponding positions of the bolts, the main body 1 and the upper cover 2 are respectively provided with a first bolt hole 4a and a second bolt hole 4b. The top of the upper cover 2 is provided with a shock-absorbing solution outlet 3b, with a recommended diameter of 40mm. Figure 5 As shown, a cylindrical second shock absorber bracket 6a and a second shock absorber spring 6b are installed at the center of the top of the upper cover 2. One end of the second shock absorber spring 6b is fixed to the second shock absorber bracket 6a, and the other end is free. The recommended height of the cylindrical second shock absorber bracket 6a is 30mm, the recommended outer diameter is 40mm, and the recommended thickness is 5mm.

[0073] like Figure 6 As shown, the cylindrical sampling inner cylinder includes two half-cylinder surfaces 7 and two sampling inner cylinder top covers 8. Figure 7As shown, the two half-cylinder surfaces 7 can be spliced ​​together to form a cylindrical tube with both the bottom and top surfaces fully open. The recommended height of the spliced ​​cylindrical tube is 300mm, the recommended inner diameter is 200mm, and the recommended thickness is 4mm. The half-cylinder surface 7 includes two fan-shaped cylindrical third shock absorber supports 9 and six third bolt holes 10a. The center of the third shock absorber support 9 is located at the center of the half-cylinder surface 7, and its horizontal position is located at clockwise angles of 45° and 135° from the center of the half-cylinder surface 7. The six third bolt holes 10a are arranged in two rows of three, each 50mm above the top and bottom of the half-cylinder surface 7. Their horizontal positions are located at clockwise angles of 30°, 90°, and 130° from the center of the half-cylinder surface 7. The recommended fan-shaped angle of the third shock absorber support 9 is 300°, the recommended height is 50mm, the recommended outer diameter is 40mm, and the recommended thickness is 5mm. The inner cylinder top cover 8 is closed at the top and open at the bottom. Figure 8 As shown, the inner cylinder top cover 8 includes six bolt holes 10b and one fourth shock-absorbing bracket 11. The recommended internal top surface diameter of the inner cylinder top cover 8 is 208mm, the recommended internal height is 50mm, and the recommended thickness is 4mm. The two inner cylinder top covers 8 are tightly fastened to the top and bottom of the two half-cylinder surfaces 7, with sealing rubber gaskets at the contact points. Furthermore, the inner cylinder top cover 8 and the two half-cylinder surfaces 7 are tightly connected by bolts. Figure 9 As shown, the bottom of the six bolt holes 10b is flush with the open edge of the inner cylinder top cover 8, and their horizontal positions are evenly distributed at 60° intervals from the central angle of the inner cylinder top cover. The fourth shock-absorbing bracket 11 is located at the center of the outer top surface of the inner cylinder top cover 8, with a recommended height of 50mm, a recommended outer diameter of 40mm, and a recommended thickness of 5mm.

[0074] In addition, the present invention also provides a sampling method using the aforementioned device for taking easily disturbed undisturbed soil samples, comprising the following steps, such as... Figure 10 As shown:

[0075] Step 1: Apply Vaseline to the inner surfaces of the two half-cylinder surfaces 7 and the two inner cylinder top covers 8. Determine the location for soil sampling. First, use a shovel to remove the surface soil to expose a fresh cross-section, and excavate to a depth of approximately 0.5m. Use a shovel to roughly outline the sample area above, to the left, right, front, and back of the intended sampling location. Gently place the two half-cylinder surfaces 7, forming a cylindrical shape, on top of the sample. Use a thin-cutting trowel to cut the soil sample slightly larger than the half-cylinder surface 7 around its perimeter. Then, press the half-cylinder surface 7 vertically downwards and repeat the previous step until the soil sample extends beyond the upper edge of the half-cylinder surface. Finally, smooth the soil sample above and below the half-cylinder surface.

[0076] Step 2: Securely fasten the inner cylinder top cover 8 to the top and bottom of the two half-cylinder surfaces 7. Place the corresponding size screws and nuts at the third bolt hole 10a and bolt hole 10b, and fix the screws symmetrically in sequence. After all the screws are fixed, tighten them one by one. Apply petroleum jelly to the contact areas of the parts to prevent changes in the moisture content of the soil sample.

[0077] Step 3: Align the fourth damping bracket 11 at the bottom of the cylindrical sampling inner cylinder with the free end of the first damping spring 5b at the bottom of the damping outer box body 1, and align the lower notch of the third damping bracket 9 on the side of the sampling inner cylinder with the free end of the first damping spring 5b on the side of the damping outer box body 1. Press down on the cylindrical sampling inner cylinder so that it is supported by the first damping spring 5b.

[0078] Step 4: Align the free end of the second shock-absorbing spring 6b at the top of the outer cover 2 with the fourth shock-absorbing bracket 11 at the top of the cylindrical sampling inner cylinder. Tightly fasten the outer cover 2 onto the top of the outer body 1. Place screws and nuts of corresponding sizes at the first bolt hole 4a and the second bolt hole 4b, and fix the screws symmetrically in sequence. After all the screws are fixed, tighten them one by one.

[0079] Step 5: Place the shock-absorbing outer box horizontally. Introduce 10-15℃ liquid thermosensitive hydrogel into the shock-absorbing solution inlet 3a at the bottom side of the main body 1 until it overflows from the shock-absorbing solution outlet 3b at the top of the top cover 2. Seal the shock-absorbing solution inlet 3a. Place a constant temperature heating rod into the shock-absorbing solution outlet 3b and control the temperature of the heating rod to 35℃, causing the thermosensitive hydrogel to condense. Seal the shock-absorbing solution outlet 3b. It is recommended to use Pluronic F127 thermosensitive hydrogel, and the recommended constant temperature heating rod is an EHEIM German imported heating rod (200W).

[0080] Step Six: Carefully transport the device of the present invention to the laboratory and store it in an environment of 30-35°C.

[0081] Step 7: When the soil sample is ready to be used, place the device of the present invention in an environment of 10-15℃ to allow the temperature-sensitive hydrogel to change from a condensed state to a liquid state. Collect the liquid temperature-sensitive hydrogel into a storage tank for use when the soil is taken again.

[0082] Step 8: Loosen the screws and nuts in the first bolt hole 4a and the second bolt hole 4b of the shock-absorbing outer box, and slowly remove the cylindrical sampling inner cylinder. Loosen the screws and nuts in the third bolt hole 10a and the bolt hole 10b of the sampling inner cylinder, and remove the two inner cylinder top covers 8. Slowly remove the two half-cylinder surfaces 7.

[0083] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A device for taking easily disturbed undisturbed soil samples, characterized in that, The device includes a square shock-absorbing outer box and a cylindrical sampling inner cylinder. The cylindrical sampling inner cylinder is placed inside the square shock-absorbing outer box. The cylindrical sampling inner cylinder and the square shock-absorbing outer box are connected by a shock-absorbing device. The square shock-absorbing outer box completes the sealing of the original soil sample. It includes a shock-absorbing outer box body and a shock-absorbing outer box cover. The bottom of the shock-absorbing outer box body is closed and the top is open. The top of the shock-absorbing outer box cover is closed and the bottom is open. The shock-absorbing outer box cover is tightly fastened to the shock-absorbing outer box body by a fastening device. The cylindrical sampling inner cylinder completes the sampling and sealing of undisturbed soil samples. It includes two half-cylinder surfaces and two sampling inner cylinder top covers. The two half-cylinder surfaces can be spliced ​​together to form a cylindrical cylinder with a completely open bottom and top surface. The sampling inner cylinder top cover is closed at the top and open at the bottom. The two sampling inner cylinder top covers are tightly fastened to the top and bottom of the two half-cylinder surfaces by fastening devices. The bottom side of the shock-absorbing outer box body is provided with a shock-absorbing solution inlet, and the top of the shock-absorbing outer box cover is provided with a shock-absorbing solution outlet. Place the shock-absorbing outer box horizontally, and introduce liquid temperature-sensitive hydrogel into the shock-absorbing solution inlet until the temperature-sensitive hydrogel overflows from the shock-absorbing solution outlet, then seal the shock-absorbing solution inlet; place a constant temperature heating rod into the shock-absorbing solution outlet, control the temperature of the constant temperature heating rod to cause the temperature-sensitive hydrogel to form a condensed state, and then seal the shock-absorbing solution outlet. When the soil sample is to be used, the device of the present invention is placed in an environment of 10-15 ℃, so that the temperature-sensitive hydrogel changes from a condensed state to a liquid state. The liquid temperature-sensitive hydrogel is collected in a storage tank and used again when the soil is taken next time.

2. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, The upper cover of the shock-absorbing outer box and the main body of the shock-absorbing outer box are tightly connected by bolts, and a sealing rubber gasket is provided at the contact position between the upper cover of the shock-absorbing outer box and the main body of the shock-absorbing outer box; the top covers of the two sampling inner cylinders are tightly connected to the two half-cylinder surfaces by bolts, and a sealing rubber gasket is provided at the contact position between the top cover of the sampling inner cylinder and the cylinder surface.

3. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, A cylindrical first shock-absorbing bracket and a first shock-absorbing spring are provided at the center of the bottom surface and the four sides inside the main body of the shock-absorbing outer box. One end of the first shock-absorbing spring is fixed to the first shock-absorbing bracket, and the other end of the first shock-absorbing spring is a free end. A cylindrical second shock-absorbing bracket and a second shock-absorbing spring are provided at the center of the top inside the upper cover of the shock-absorbing outer box. One end of the second shock-absorbing spring is fixed to the second shock-absorbing bracket, and the other end of the second shock-absorbing spring is a free end.

4. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, The thermosensitive hydrogel is Pluronic F127 thermosensitive hydrogel.

5. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, The inner bottom surface of the shock-absorbing outer box body is 400×400 mm2, the inner height is 500 mm, and the thickness is 4 mm; the inner top surface of the shock-absorbing outer box cover is 408×408 mm2, the inner height is 50 mm, and the thickness is 4 mm; the first shock-absorbing bracket has a height of 30 mm, an outer diameter of 40 mm, and a thickness of 4 mm; the second shock-absorbing bracket has a height of 30 mm, an outer diameter of 40 mm, and a thickness of 5 mm.

6. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, The half-side cylinder surface includes two fan-shaped cylindrical third shock-absorbing supports. The center height of the third shock-absorbing support is set at the center of the half-side cylinder surface, and the horizontal position of the third shock-absorbing support is set at the center angle of the half-side cylinder surface at 45° and 135° clockwise. The top cover of the sampling inner cylinder is provided with a fourth shock-absorbing support, which is located at the center of the outer top surface of the top cover of the sampling inner cylinder.

7. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 6, characterized in that, The cylindrical tube after splicing the two half-side cylinders has a height of 300 mm, an inner diameter of 200 mm, and a thickness of 4 mm; the inner top surface diameter of the sampling inner cylinder top cover is 208 mm, the inner height is 50 mm, and the thickness is 4 mm; the height of the third shock absorber and the fourth shock absorber are 50 mm, the outer diameter is 40 mm, and the thickness is 5 mm.

8. The apparatus for taking easily disturbed undisturbed soil samples as described in claim 1, characterized in that, The heating power of the constant temperature heating rod is 200 W.

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