Undisturbed soil sampling-MICP reinforcement-sample preparation integrated device and method

Abstract

The invention relates to an undisturbed soil sampling-MICP reinforcement-sample preparation integrated device and method. The device comprises a reinforcing cylinder, a scraper knife, an annular knife, a plurality of liquid injection needle assemblies and a corer, a plurality of liquid injection holes are formed in the reinforcing cylinder; the scraper knife comprises a scraper knife cylinder and an upper cover; the scraper knife cylinder comprises a second cylinder body and is provided with a scraper knife head; the scraper knife is used for installing the reinforcing cylinder through the second cylinder body and forms a sampling mechanism together with the reinforcing cylinder; the annular cutter is matched with the scraper knife and the reinforcing cylinder to cut the soil sample; the multiple liquid injection needle assemblies are used for being connected with the liquid injection holes of the reinforcing cylinder, and the multiple liquid injection needle assemblies and the reinforcing cylinder jointly form an MICP reinforcing mechanism; the coring device comprises a third barrel and a coring cutter barrel; the coring device is used for being inserted into the inverted reinforcing cylinder through the coring cutter cylinder, and the coring device and the reinforcing cylinder jointly form a sample preparation mechanism. By adopting the design of the reinforcing cylinder, a soil sample is always in the reinforcing cylinder in the sampling, MICP reinforcing and sample preparation processes, so that the disturbance of a soil body structure in the test process is greatly avoided.

Description

Technical Field

[0001] The invention relates to the field of clay reinforcement, and in particular to an integrated device and method for undisturbed soil sampling-MICP reinforcement-sample preparation. Background Art

[0002] Due to the poor water permeability and easy expansion and contraction of clay, special attention should be paid to its mechanical properties and stability in engineering design and construction. At present, the methods for treating clay include replacement, dynamic tamping, vibroflotation, cement soil mixing, etc. These methods will cause a certain degree of damage to the environment and the ecology in the region.

[0003] MICP technology, namely biologically induced calcium carbonate precipitation, is a technology that uses microbial activity to generate calcium carbonate precipitation in the soil. This technology produces calcium carbonate precipitation through the metabolic activities of microorganisms, especially urea hydrolysis, thereby enhancing the strength and stability of the soil. A large number of studies on MICP technology have been applied to sandy soils. In recent years, MICP technology has gradually turned to research on clay and has received a good response. Due to the characteristics of clay, most of the research on MICP technology remains at the level of indoor experimental research. However, in order to achieve the reinforcement of clay soil, the soil body is generally reshaped and sampled, which completely destroys the structure of the clay soil. The test results are difficult to accurately evaluate the reinforcement effect of the in-situ soil body, thus restricting the application and promotion of MICP reinforcement clay soil technology in engineering.

[0004] Therefore, how to reduce the disturbance to the soil structure and achieve pressurized liquid injection reinforcement has become an urgent problem that needs to be solved. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an integrated device and method for undisturbed soil sampling-MICP reinforcement-sample preparation. The design of a reinforcement cylinder is adopted, so that the soil sample is always in the reinforcement cylinder during the sampling, MICP reinforcement and sample preparation processes, which greatly avoids the disturbance of the soil structure during the test.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation, comprising:

[0007] The reinforcement tube has a cylindrical first tube body with a closed top and an open bottom, and a plurality of injection holes are provided on the reinforcement tube;

[0008] The scraper comprises a scraper cylinder with openings on the top and bottom sides, and an upper cover located on the top side of the scraper cylinder; the scraper cylinder comprises a second cylinder body, and a scraper head arranged on the bottom side of the second cylinder body; the scraper is used to install the reinforcement cylinder through the second cylinder body, and together with the reinforcement cylinder, forms a sampling mechanism;

[0009] Annular knife, used for cutting soil samples in cooperation with shovel blade and reinforcement tube;

[0010] A plurality of injection needle assemblies, the liquid inlet end of which is connected to the injection pump through a hose, the injection needle assembly is used to connect to the injection hole of the reinforcement tube, and together with the reinforcement tube, it forms a MICP reinforcement mechanism;

[0011] The corer comprises a third cylinder body and a core cutting knife cylinder; the third cylinder body is closed on the top side and open on the bottom side; the top side of the core cutting knife cylinder is connected to the top wall inside the third cylinder body; the corer is used to be inserted into the inverted reinforcement cylinder through the core cutting knife cylinder, and together with the reinforcement cylinder, forms a sample preparation mechanism.

[0012] Furthermore, the first cylinder body of the reinforcement cylinder is divided into three sections from top to bottom, including a first cylinder upper section, a first cylinder middle section, and a first cylinder lower section; during the sample preparation process, the first cylinder upper section is separated from the first cylinder middle section to form a gap for the annular knife to penetrate, so that the annular knife can be inserted close to the top side of the first cylinder middle section to cut the soil sample; the first cylinder lower section is separated from the first cylinder middle section to form a gap for the annular knife to enter, so that the annular knife can be inserted close to the bottom side of the first cylinder middle section to cut the soil sample.

[0013] Furthermore, the reinforcement cylinder also includes a slide rail, and the slide rail includes a T-shaped slide groove; the outer wall of the reinforcement cylinder is provided with a T-shaped slideway that cooperates with the T-shaped slide groove; the inner wall of the second cylinder body is provided with a first slide groove corresponding to the slide rail, which is used for circumferential positioning of the reinforcement cylinder and the scraper cylinder; the inner wall of the core removal cylinder is provided with a second slide groove corresponding to the slide rail, which is used for circumferential positioning of the reinforcement cylinder and the core removal cylinder.

[0014] Furthermore, through grooves are provided in the T-shaped slideways of the first cylinder upper section and the first cylinder lower section, and spring pins are respectively arranged in the T-shaped slideways at positions corresponding to the two through grooves. The through groove of the first cylinder upper section cooperates with the spring pin located on the upper side of the slide rail, and is used to set the upper limit position of the first cylinder upper section moving upward relative to the first cylinder middle section, thereby controlling the gap separating the first cylinder upper section and the first cylinder middle section; the through groove of the first cylinder lower section cooperates with the spring pin located on the lower side of the slide rail, and is used to set the lower limit position of the first cylinder lower section moving downward relative to the first cylinder middle section, thereby controlling the gap separating the first cylinder lower section and the first cylinder middle section.

[0015] Furthermore, the T-shaped slideway is provided with a plurality of raised hemispherical bodies distributed vertically; the T-shaped slide groove of the slide rail is provided with hemispherical grooves at corresponding positions for increasing the resistance to relative displacement of the upper section of the first cylinder, the middle section of the first cylinder and the lower section of the first cylinder.

[0016] Furthermore, a step portion is provided on the inner wall of the second cylinder of the shovel blade near the bottom side, which is used to limit the reinforcement tube when the reinforcement tube is installed into the second cylinder from the top side; a cutting groove is transversely penetrated through the side surface of the second cylinder, and the position of the cutting groove corresponds to the top surface of the step portion, which is used for the annular knife to be inserted into the bottom side of the reinforcement tube to cut the soil sample.

[0017] Furthermore, the upper cover of the blade is threadedly connected to the blade tube; a handle is also provided on the top side of the upper cover; and a rubber ring is also provided between the upper cover and the blade tube.

[0018] Furthermore, the injection needle assembly includes a connector, an injection tube and a filling inner core; the connector includes an internal threaded sleeve and an external threaded sleeve arranged at the front end of the internal threaded sleeve; the injection hole is a threaded hole; the connector is threadedly connected to the injection hole through the external threaded sleeve; the injection tube includes a tube body, an injection head located at the front end of the tube body, the front section of the tube body is provided with an external threaded portion matching the internal threaded sleeve, and the rear section of the tube body is provided with scale lines; the filling inner core includes an inner core body matching the inner side of the tube body of the injection tube, an inner core head located at the front end of the inner core body matching the inner side of the injection head of the injection tube, and the front end of the inner core head passes through the injection head and is exposed from the injection head.

[0019] Furthermore, the core cutting tool barrel of the core remover is composed of a three-lobed blade body circumferentially surrounding a cylindrical structure; a sleeve is also provided on the side of the core cutting tool barrel near the bottom end; an annular groove is provided on the top wall inside the third cylinder body; and the top end of the core cutting tool barrel is inserted into the annular groove.

[0020] A method for undisturbed soil sampling-MICP reinforcement-sample preparation adopts the above-mentioned undisturbed soil sampling-MICP reinforcement-sample preparation integrated device, and is specifically carried out in the following steps:

[0021] S1. Put the reinforcement tube into the shovel blade to assemble into a sampling mechanism. In the target soil sampling area, press down the sampling mechanism to make it enter into the soil body. Then take out the sampling mechanism and cut it with a circular knife to obtain the reinforcement tube containing the soil sample.

[0022] S2, placing the reinforcement tube obtained in step S1 on the permeable stone, installing the injection needle assembly on the injection hole of the reinforcement tube, and then connecting the injection needle assembly to the injection pump through a hose to assemble a MICP reinforcement mechanism; injecting liquid into the soil sample in the reinforcement tube to perform MICP reinforcement operation;

[0023] S3. After the reinforcement operation in step S2, pull the upper section of the first cylinder and the lower section of the first cylinder to form a gap between the upper section of the first cylinder and the middle section of the first cylinder, and between the lower section of the first cylinder and the middle section of the first cylinder, and use the annular knife to cut the soil sample in the reinforcement cylinder through the gap; turn the reinforcement cylinder upside down, buckle the corer on the reinforcement cylinder from top to bottom, press the corer, then take out the corer, take out the soil sample in the middle section of the coring knife cylinder, and complete the sampling of the original soil.

[0024] Advantages of the present invention: The integrated device and method for undisturbed soil sampling-MICP reinforcement-sample preparation of the present invention adopts a reinforcement cylinder design, so that the soil sample is always in the reinforcement cylinder during the sampling, MICP reinforcement and sample preparation processes, which greatly avoids the disturbance of the soil structure during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional schematic diagram of a reinforcement cylinder of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0026] Figure 2 It is an exploded schematic diagram of a reinforcement cylinder of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0027] Figure 3 for Figure 2 A local enlarged schematic diagram of region A;

[0028] Figure 4 for Figure 2 A local enlarged schematic diagram of area B;

[0029] Figure 5 for Figure 2 A local enlarged schematic diagram of the C region;

[0030] Figure 6 A three-dimensional schematic diagram of a shovel blade of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0031] Figure 7 A schematic diagram of the internal structure of a blade of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0032] Figure 8 It is an internal schematic diagram of a sampling mechanism of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0033] Fig. 9 A three-dimensional schematic diagram of a ring knife of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0034] Fig.10It is a three-dimensional schematic diagram of an injection needle assembly of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0035] Fig.11 It is an exploded schematic diagram of an injection needle assembly of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0036] Fig.12 A three-dimensional schematic diagram of a MICP reinforcement mechanism of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0037] Fig.13 It is a schematic diagram of the cooperation between the reinforcement cylinder and the annular knife of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation in an embodiment;

[0038] Fig.14 A three-dimensional schematic diagram of a corer of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0039] Fig.15 It is a schematic diagram of an explosion of a corer of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0040] Fig.16 It is an internal schematic diagram of a sample preparation mechanism of an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation according to an embodiment;

[0041] Among them, 1-reinforcement cylinder, 2-shovel, 3-annular knife, 4-injection needle assembly, 5-core remover, 11-first cylinder upper section, 12-first cylinder middle section, 13-first cylinder lower section, 14-slide rail, 15-T-shaped slide, 16-through groove, 17-raised hemispherical body, 18-spring pin, 19-hemispherical groove, 21-shovel cylinder, 22-upper cover, 23-handle, 24-rubber ring, 211-second cylinder, 212-shovel head, 2 13-step portion, 214-first slide groove, 215-cutting groove, 41-connector, 42-liquid injection tube, 43-filling inner core, 411-inner thread sleeve, 412-external thread sleeve, 421-tube body, 422-liquid injection head, 423-scale line, 431-inner core body, 432-inner core head, 51-third cylinder, 52-coring knife cylinder, 511-second slide groove, 512-annular groove, 521-dividing knife body, 522-hoop. DETAILED DESCRIPTION

[0042] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0043] Example

[0044] Please refer to Figures 1 to 16 As shown, this embodiment provides an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation, comprising:

[0045] The reinforcement tube 1 has a cylindrical first tube body with a closed top and an open bottom, and a plurality of injection holes are provided on the reinforcement tube 1;

[0046] The scraper 2 includes a scraper cylinder 21 with openings on the top and bottom sides, and an upper cover 22 located on the top side of the scraper cylinder 21; the scraper cylinder 21 includes a second cylinder 211 and a scraper head 212 arranged on the bottom side of the second cylinder 211; the scraper 2 is used to install the reinforcement cylinder 1 through the second cylinder 211, and together with the reinforcement cylinder 1, it forms a sampling mechanism;

[0047] The annular knife 3 is used to cooperate with the blade 2 and the reinforcement tube 1 to cut the soil sample;

[0048] A plurality of injection needle assemblies 4, the liquid inlet end of which is connected to the injection pump via a hose, the injection needle assembly 4 is used to be connected to the injection hole of the reinforcement tube 1, and together with the reinforcement tube 1, forms a MICP reinforcement mechanism;

[0049] The corer 5 comprises a third barrel 51 and a core cutting knife barrel 52; the third barrel 51 is closed on the top side and open on the bottom side; the top side of the core cutting knife barrel 52 is connected to the top wall inside the third barrel 51; the corer 5 is used to be inserted into the inverted reinforcement barrel 1 through the core cutting knife barrel 52, and together with the reinforcement barrel 1, forms a sample preparation mechanism.

[0050] Refer to Figure 2 and Fig.13 As shown, the first cylinder body of the reinforcement cylinder 1 is divided into three sections from top to bottom, including a first cylinder body upper section 11, a first cylinder body middle section 12, and a first cylinder body lower section 13; during the sample preparation process, the first cylinder body upper section 11 is separated from the first cylinder body middle section 12 to form a gap for the annular knife 3 to penetrate, which is used for the annular knife 3 to be closely attached to the top side of the first cylinder body middle section 12 to penetrate and cut the soil sample; the first cylinder body lower section 13 is separated from the first cylinder body middle section 12 to form a gap for the annular knife 3 to enter, which is used for the annular knife 3 to be closely attached to the bottom side of the first cylinder body middle section 12 to penetrate and cut the soil sample.

[0051] Refer to Figure 2 and Figure 7 As shown, the reinforcement tube 1 also includes a slide rail 14, and the slide rail 14 includes a T-shaped slide groove; the outer wall of the reinforcement tube 1 is provided with a T-shaped slideway 15 that cooperates with the T-shaped slide groove; the inner wall of the second cylinder 211 is provided with a first slide groove 214 corresponding to the slide rail 14, which is used for circumferential positioning of the reinforcement tube 1 and the scraper tube 21; the inner wall of the core tube 5 is provided with a second slide groove 511 corresponding to the slide rail 14, which is used for circumferential positioning of the reinforcement tube 1 and the core tube 5.

[0052] Refer to Figures 2 to 5 As shown, a through slot 16 is provided in the T-shaped slideway 15 of the first cylinder upper section 11 and the first cylinder lower section 13, and spring pins 18 are respectively provided in the T-shaped slideway at positions corresponding to the two through slots 16. The through slot 16 of the first cylinder upper section 11 cooperates with the spring pin 18 located on the upper side of the slide rail 14 to limit the upper position of the first cylinder upper section 11 moving upward relative to the first cylinder middle section 12, thereby controlling the gap separating the first cylinder upper section 11 and the first cylinder middle section 12; the through slot 16 of the first cylinder lower section 13 cooperates with the spring pin 18 located on the lower side of the slide rail 14 to limit the lower position of the first cylinder lower section 13 moving downward relative to the first cylinder middle section 12, thereby controlling the gap separating the first cylinder lower section 13 and the first cylinder middle section 12.

[0053] Refer to Figures 2 to 5 As shown, the T-shaped slideway 15 is provided with a plurality of raised hemispherical bodies 17 distributed vertically; the T-shaped slide groove of the slide rail 14 is provided with a hemispherical groove 19 at a corresponding position for increasing the resistance to the relative displacement of the first cylinder upper section 11, the first cylinder middle section 12, and the first cylinder lower section 13.

[0054] Refer to Figure 6 , Figure 7 and Figure 8 As shown, the inner wall of the second cylinder 211 of the blade 2 is provided with a step portion 213 near the bottom side, which is used to limit the reinforcement cylinder 1 when it is installed into the second cylinder 211 from the top side; a cutting groove 215 is horizontally penetrated through the side of the second cylinder 211, and the position of the cutting groove 215 corresponds to the top surface of the step portion 213, which is used for the annular knife 3 to be inserted into the bottom side of the reinforcement cylinder 1 to cut the soil sample.

[0055] Refer to Figure 7 As shown, the upper cover 22 of the blade 2 is threadedly connected to the blade tube 21 ; a handle 23 is also provided on the top side of the upper cover 22 ; and a rubber ring 24 is also provided between the upper cover 22 and the blade tube 21 .

[0056] Refer to Fig.10 , Fig.11 and Fig.12As shown, the injection needle assembly 4 includes a connector 41, an injection tube 42 and a filling inner core 43; the connector 41 includes an internal threaded sleeve 411 and an external threaded sleeve 412 arranged at the front end of the internal threaded sleeve 411; the injection hole is a threaded hole; the connector 41 is threadedly connected to the injection hole through the external threaded sleeve 412; the injection tube 42 includes a tube body 421 and an injection head 422 located at the front end of the tube body 421, the front section of the tube body 421 is provided with an external threaded portion matching the internal threaded sleeve 411, and the rear section of the tube body 421 is provided with a scale line 423; the filling inner core 43 includes an inner core body 431 matching the inner side of the tube body 421 of the injection tube 42, and an inner core head 432 located at the front end of the inner core body 431 and matching the inner side of the injection head 422 of the injection tube 42, the front end of the inner core head 432 passes through the injection head 422 and is exposed from the injection head 422.

[0057] Refer to Fig.14 , Fig.15 and Fig.16 As shown, the core cutting knife barrel 52 of the core remover 5 is composed of a three-petal blade body 521 circumferentially surrounding a cylindrical structure; a sleeve 522 is also provided on the side of the core cutting knife barrel 52 near the bottom end; an annular groove 512 is provided on the top wall on the inner side of the third cylinder body 51; and the top end of the core cutting knife barrel 52 is inserted into the annular groove 512.

[0058] In an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation of the present embodiment, the assembly method of the reinforcement cylinder is as follows: first, assemble the slide rail 14 with the first cylinder middle section 12 through the T-shaped slide groove, then slide the first cylinder upper section 11 into the top end of the slide rail 14, and slide the first cylinder lower section 13 into the bottom end of the slide rail 14. When the through grooves of the first cylinder upper section 11 and the first cylinder lower section 13 slide to the spring pin of the slide rail 14, the spring pin is released and stuck in the through groove; after the spring pin pops out, it limits the displacement distance of the first cylinder upper section and the first cylinder lower section, thereby controlling the gap size between the first cylinder upper section and the first cylinder middle section, and between the first cylinder lower section and the first cylinder middle section; the raised hemispherical body and the hemispherical groove provided play the role of limiting and increasing.

[0059] In an integrated device for undisturbed soil sampling-MICP reinforcement-sample preparation of the present embodiment, when the assembled reinforcement cylinder is used to assemble the sampling mechanism, the slide rail of the reinforcement cylinder is aligned with the first slide groove of the blade cylinder, and then the reinforcement cylinder is inserted into the blade cylinder from top to bottom until it abuts against the step portion; then, the upper cover is threadedly connected to the top side of the blade cylinder and tightened to firmly fix the reinforcement cylinder in the blade; the inner wall diameter of the reinforcement cylinder, the inner wall diameter of the step portion, and the inner wall diameter of the blade head are substantially consistent; then, the handle is installed on the upper cover.

[0060] This embodiment also provides an intact soil sampling-MICP reinforcement-sample preparation method, using the above-mentioned intact soil sampling-MICP reinforcement-sample preparation integrated device, specifically following the steps below:

[0061] S1. Put the reinforcement tube into the shovel blade and assemble it into a sampling mechanism. In the target soil sampling area, press down the sampling mechanism to make the sampling mechanism enter the soil body, then take out the sampling mechanism, cut it with the annular knife, and obtain the reinforcement tube containing the soil sample; wherein, the shovel blade head is sharpened to make it easier for the shovel blade to enter the soil body. When taking soil, the soil body is leveled to keep the top side of the part where the soil body enters the shovel blade as flat as possible; after the shovel blade is taken out of the soil body, the annular knife is inserted into the cutting groove to cut the soil sample in the shovel blade, and then the upper cover is opened, the shovel blade is inverted, and the reinforcement tube containing the soil sample is taken out; specifically, in this embodiment, the inner diameter of the soil sample taken by the reinforcement tube is about 10 cm and the height is about 15 cm;

[0062] S2, placing the reinforcement tube obtained in step S1 on the permeable stone, installing the injection needle assembly on the injection hole of the reinforcement tube, and then connecting the injection needle assembly to the injection pump through a hose to assemble a MICP reinforcement mechanism; injecting liquid into the soil sample in the reinforcement tube to perform MICP reinforcement operation; wherein, filter paper is also laid on the permeable stone, and the reinforcement tube is placed on the filter paper; when installing the injection needle, first install the connector on the injection hole of the reinforcement tube, and then insert the filling inner core into the injection tube, and then pass the whole through the connector and insert it into the soil sample of the reinforcement tube. The injection tube is connected to the connector by thread, and then the scale line on the injection tube is used to control the size of the injection tube inserted into the soil sample, thereby ensuring The final soil sample is in an undisturbed state; the filling inner core can make it easier for the injection tube to enter the soil sample; when injecting, part or all of the injection needle assembly can be selected as needed. When connecting, the filling inner core of the injection needle assembly at the injection point that needs to be injected is taken out, and then the injection tube is connected to the injection pump through a hose; the filling inner core of the injection needle assembly at the injection point that does not need to be injected is not taken out, so that it forms a seal for the injection hole to prevent the soil sample from flowing out of the injection hole; a cementing solution mixed with calcium chloride and urea is injected into the soil sample in the reinforcement tube through the injection pump, and then the bacterial solution for reinforcement is injected into the soil sample in the same way. This is a cycle reinforcement. During the entire reinforcement process, one or more cycles of reinforcement can be performed as needed;

[0063] S3. After the reinforcement operation in step S2, pull the upper section of the first cylinder and the lower section of the first cylinder to form a gap between the upper section of the first cylinder and the middle section of the first cylinder, and between the lower section of the first cylinder and the middle section of the first cylinder, and use the annular knife to cut the soil sample in the reinforcement cylinder through the gap; turn the reinforcement cylinder upside down, use the corer to buckle it on the reinforcement cylinder from top to bottom, press the corer, and then take out the corer to take out the soil sample in the middle section of the coring knife cylinder, and complete the sampling of the original soil; the inner diameter of the third cylinder of the coring cylinder is roughly consistent with the outer diameter of the first cylinder, ensuring that the positioning of the coring knife cylinder does not deviate during the sampling process; specifically, in this embodiment, the height of the middle section of the first cylinder is about 8 cm, and the inner diameter of the coring knife cylinder is about 3-4 cm, and the size of the final soil sample obtained is much smaller than the size of the soil sample taken by the reinforcement cylinder, so as to ensure that the final soil sample is in an undisturbed state.

[0064] In an integrated device and method for undisturbed soil sampling-MICP reinforcement-sample preparation of the present embodiment, a reinforcement tube is used for sampling, reinforcement and sample preparation, and the soil sample is always located in the reinforcement tube. During the whole process, disturbance to the soil structure is greatly avoided; the reinforcement tube adopts a three-section assembly structure, and the gap between the three sections is effectively controlled by the structure of the slide rail, slideway, through groove and spring pin, and the gap is used to cut the soil sample in cooperation with the annular knife, thereby ensuring the flatness of the upper and lower end surfaces of the final sample and reducing the sample preparation error caused by human operation; the design of the injection needle assembly can realize rapid connection with the reinforcement tube through a connector, and the design of the injection tube can accurately control the length of the injection head entering the soil sample, ensuring a relatively While achieving a good reinforcement effect, it can also avoid disturbing the soil sample in the target reinforcement area. Filling the inner core can make it easier to insert the injection tube into the soil sample, prevent the injection tube from being blocked, and use it as a seal when the injection tube is not in use. The cooperation between the corer and the reinforcement tube can achieve accurate and rapid coring, reducing the sample preparation error. The middle section of the first cylinder body of the reinforcement tube is provided with mutually staggered injection holes, and the top of the upper section of the first cylinder body is also provided with evenly distributed injection holes. The injection pump can use a peristaltic pump, and low-pressure injection can ensure the uniformity of sample reinforcement. Among them, different numbers of injection holes at different positions can be opened according to the different permeability of the soil to perform injection operations, so as to meet the uniform reinforcement of soils with different permeability characteristics.

[0065] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. An integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation, characterized in that: The device includes: The reinforcement tube (1) comprises a cylindrical first tube body with a closed top side and an open bottom side, and a plurality of liquid injection holes are provided on the reinforcement tube (1); A scraper (2) comprises a scraper cylinder (21) with openings on both the top and bottom sides, and an upper cover (22) located on the top side of the scraper cylinder (21); the scraper cylinder (21) comprises a second cylinder body (211) and a scraper head (212) arranged on the bottom side of the second cylinder body (211); the scraper (2) is used to install the reinforcement cylinder (1) through the second cylinder body (211), and together with the reinforcement cylinder (1) form a sampling mechanism; The annular knife (3) is used to cooperate with the shovel blade (2) and the reinforcement tube (1) to cut the soil sample; A plurality of injection needle assemblies (4), the liquid inlet ends of which are connected to the injection pump via a hose, the injection needle assemblies (4) being used to be connected to the injection holes of the reinforcement tube (1), and together with the reinforcement tube (1) forming a MICP reinforcement mechanism; The corer (5) comprises a third barrel (51) and a core cutting knife barrel (52); the third barrel (51) is closed on the top side and open on the bottom side; the top side of the core cutting knife barrel (52) is connected to the top wall of the inner side of the third barrel (51); the corer (5) is used to be inserted into the inverted reinforcement barrel (1) through the core cutting knife barrel (52), and together with the reinforcement barrel (1) form a sample preparation mechanism.

2. The integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to claim 1 is characterized in that: The first cylinder body of the reinforcement cylinder (1) is divided into three sections from top to bottom, including a first cylinder body upper section (11), a first cylinder body middle section (12), and a first cylinder body lower section (13); during the sample preparation process, the first cylinder body upper section (11) is separated from the first cylinder body middle section (12) to form a gap for the annular knife (3) to penetrate, so that the annular knife (3) can be inserted into the top side of the first cylinder body middle section (12) to cut the soil sample; the first cylinder body lower section (13) is separated from the first cylinder body middle section (12) to form a gap for the annular knife (3) to enter, so that the annular knife (3) can be inserted into the bottom side of the first cylinder body middle section (12) to cut the soil sample.

3. The integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to claim 2 is characterized in that: The reinforcement tube (1) also includes a slide rail (14), and the slide rail (14) includes a T-shaped slide groove; the outer wall of the reinforcement tube (1) is provided with a T-shaped slideway (15) that cooperates with the T-shaped slide groove; the inner wall of the second cylinder body (211) is provided with a first slide groove (214) corresponding to the slide rail (14), which is used for circumferential positioning of the reinforcement tube (1) and the scraper tube (21); the inner wall of the core removal tube (5) is provided with a second slide groove (511) corresponding to the slide rail (14), which is used for circumferential positioning of the reinforcement tube (1) and the core removal tube (5).

4. The integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to claim 3 is characterized in that: A through groove (16) is provided in the T-shaped slideway (15) of the first cylinder upper section (11) and the first cylinder lower section (13), and spring pins (18) are respectively provided at positions corresponding to the two through grooves (16). The through groove (16) of the first cylinder upper section (11) cooperates with the spring pin (18) located on the upper side of the slide rail (14) to limit the upper position of the first cylinder upper section (11) moving upward relative to the first cylinder middle section (12), thereby controlling the gap separating the first cylinder upper section (11) and the first cylinder middle section (12); the through groove (16) of the first cylinder lower section (13) cooperates with the spring pin (18) located on the lower side of the slide rail (14) to limit the lower position of the first cylinder lower section (13) moving downward relative to the first cylinder middle section (12), thereby controlling the gap separating the first cylinder lower section (13) and the first cylinder middle section (12).

5. The integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to claim 3 is characterized in that: The T-shaped slideway (15) is provided with a plurality of vertically distributed raised hemispherical bodies (17); the T-shaped slideway of the slide rail (14) is provided with hemispherical grooves (19) at corresponding positions for increasing the resistance to relative displacement of the first cylinder upper section (11), the first cylinder middle section (12), and the first cylinder lower section (13).

6. An integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to any one of claims 2 to 5, characterized in that: The inner wall of the second cylinder (211) of the blade (2) is provided with a step portion (213) near the bottom side, which is used to limit the position of the reinforcement cylinder (1) when the reinforcement cylinder (1) is installed into the second cylinder (211) from the top side; a cutting groove (215) is transversely penetrated through the side surface of the second cylinder (211), and the position of the cutting groove (215) corresponds to the top surface of the step portion (213), so as to allow the annular knife (3) to be closely attached to the bottom side of the reinforcement cylinder (1) and to penetrate and cut the soil sample.

7. An integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to any one of claims 2 to 5, characterized in that: The upper cover (22) of the scraper (2) is threadedly connected to the scraper tube (21); a handle (23) is also provided on the top side of the upper cover (22); and a rubber ring (24) is also provided between the upper cover (22) and the scraper tube (21).

8. An integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to any one of claims 2 to 5, characterized in that: The injection needle assembly (4) comprises a connector (41), an injection tube (42) and a filling inner core (43); the connector (41) comprises an internal thread sleeve (411) and an external thread sleeve (412) arranged at the front end of the internal thread sleeve (411); the injection hole is a threaded hole; the connector (41) is threadedly connected to the injection hole through the external thread sleeve (412); the injection tube (42) comprises a tube body (421), an injection head (422) located at the front end of the tube body (421), and the tube body (421) The front section is provided with an external threaded portion matching the internal threaded sleeve (411), and the rear section of the tube body (421) is provided with a scale mark (423); the filling inner core (43) comprises an inner core body (431) matching the inner side of the tube body (421) of the injection tube (42), and an inner core head (432) located at the front end of the inner core body (431) and matching the inner side of the injection head (422) of the injection tube (42), wherein the front end of the inner core head (432) passes through the injection head (422) and is exposed from the injection head (422).

9. An integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation according to any one of claims 2 to 5, characterized in that: The core cutting knife barrel (52) of the core remover (5) is composed of a three-lobed knife body (521) circumferentially surrounding a cylindrical structure; a sleeve (522) is also provided on the side of the core cutting knife barrel (52) near the bottom end; an annular groove (512) is provided on the top wall of the inner side of the third cylinder body (51); and the top end of the core cutting knife barrel (52) is inserted into the annular groove (512).

10. A method for undisturbed soil sampling-MICP reinforcement-sample preparation, characterized in that: The integrated device for undisturbed soil sampling, MICP reinforcement and sample preparation as claimed in any one of claims 2 to 9 is used, and the steps are specifically as follows: S1. Put the reinforcement tube into the shovel blade to assemble into a sampling mechanism. In the target soil sampling area, press down the sampling mechanism to make it enter into the soil body. Then take out the sampling mechanism and cut it with a circular knife to obtain the reinforcement tube containing the soil sample. S2, placing the reinforcement tube obtained in step S1 on the permeable stone, installing the injection needle assembly on the injection hole of the reinforcement tube, and then connecting the injection needle assembly to the injection pump through a hose to assemble a reinforcement mechanism; injecting liquid into the soil sample in the reinforcement tube to perform reinforcement operation; S3. After the reinforcement operation in step S2, pull the upper section of the first cylinder and the lower section of the first cylinder to form a gap between the upper section of the first cylinder and the middle section of the first cylinder, and between the lower section of the first cylinder and the middle section of the first cylinder, and use the annular knife to cut the soil sample in the reinforcement cylinder through the gap; turn the reinforcement cylinder upside down, buckle the corer on the reinforcement cylinder from top to bottom, press the corer, then take out the corer, take out the soil sample in the middle section of the coring knife cylinder, and complete the sampling of the original soil.

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