Geotechnical investigation drill hole sealing device and hole sealing method

Abstract

The invention relates to the technical field of geotechnical investigation hole sealing, and discloses a geotechnical investigation drill hole sealing device and a geotechnical investigation drill hole sealing method.The geotechnical investigation drill hole sealing device comprises a lifting driving device, a drainage guiding mechanism and a compaction control device, and the lifting driving device is arranged above a drill hole; the drainage guide mechanism comprises a guide pipe and a sealing device, the top end of the guide pipe is connected with a lifting driving device, the lifting driving device is suitable for driving the guide pipe to axially move in the drill hole, and the sealing device is arranged at the bottom end of the guide pipe and controls the opening and closing state of the bottom end of the channel; the compaction control device is connected with the lifting driving device, and the lifting driving device is suitable for driving the compaction control device to move in the channel in the axial direction of the channel so as to compact the hole sealing material and control the compaction degree. The hole sealing material can be fully expanded and expanded at the bottom of the sealed hole, gaps are prevented from existing in the hole, the sealed hole is tighter, and the compactness of the hole sealing material can be controlled according to needs.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical investigation and hole sealing, and in particular to a geotechnical investigation drilling hole sealing device and a hole sealing method. Background Art

[0002] Geotechnical engineering investigation is a fundamental work that provides the geotechnical parameters and geological environment information required for foundation and foundation design for various engineering construction projects. Its main contents include drilling sampling, in-situ testing, geotechnical testing and groundwater observation, etc., aiming to identify the geological structure, soil layer distribution, groundwater conditions and adverse geological phenomena of the construction site, and provide a scientific basis for project site selection, design and construction. During the geotechnical engineering investigation process, it is usually necessary to drill holes on the ground using a drilling rig to obtain geotechnical parameters of the underground soil layer. After the drilling operation is completed, the original drill hole needs to be sealed. This is especially true in engineering projects such as railways, dams, embankments, slopes and flood control walls. The density of the sealing is crucial to the stability of subsequent projects. If the sealing is not strict, it may cause pore water leakage or soil softening, which in turn affects the anti-sliding stability and anti-seepage performance of the engineering structure, and even induce serious problems such as structural deformation or damage.

[0003] In current engineering practice, the common method of sealing a borehole is to place sealing materials into it. A geological borehole sealing device currently available includes a drill rod, a pusher cap, a drain pipe, and a guide pipe. The guide pipe is first placed in the drilled hole, and a water coil extends into the guide pipe to extract groundwater from the hole. The top end of the drill rod is connected to a drive device, and the bottom end is connected to the pusher cap. During the hole-filling process, workers first place clay balls into the guide pipe. The drill rod is then pushed down the guide pipe, and the pusher cap gradually compacts the clay balls. The drill rod is then withdrawn, and the guide pipe and drain pipe are removed to complete the hole-sealing operation. Because the sealing device drains groundwater from the bottom of the borehole during the sealing process, the clay balls cannot fully come into contact with the groundwater. Even after the hole is sealed, the sealing material absorbs groundwater, limiting its expansion and preventing it from fully expanding at the bottom of the hole. This results in voids within the hole and a loosely sealed borehole. Summary of the Invention

[0004] In view of this, the present invention provides a drilling hole sealing device and a drilling hole sealing method for geotechnical exploration to solve the problems of poor sealing density and the presence of voids in the hole.

[0005] In a first aspect, the present invention provides a geotechnical exploration drilling and sealing device, comprising:

[0006] A lifting drive device, wherein the lifting drive device is arranged above the drill hole;

[0007] A drainage guide mechanism, comprising: a guide tube and a sealing device, wherein a channel is provided in the middle of the guide tube, and drainage holes are provided on the top and bottom surfaces of the guide tube, and a water-containing cavity is provided on the side wall thereof. The top end of the guide tube is connected to the lifting drive device, and the lifting drive device is adapted to drive the guide tube to move axially in the sealing hole. The sealing device is provided at the bottom end of the guide tube, and the sealing device has an open state for opening the bottom end opening of the channel and a closed state for closing the bottom end opening of the channel.

[0008] A compaction control device is connected to the lifting drive device, and the lifting drive device is suitable for driving the compaction control device to move along its axial direction in the channel to compact the sealing material put into the channel.

[0009] Beneficial effects

[0010] When the guide tube is inserted into the bottom of the sealing hole, the sealing device is closed, and the groundwater enters the water chamber along the drainage hole and is discharged, thereby isolating the sealing material from direct contact with the groundwater, preventing the sealing material from absorbing water and expanding before reaching the bottom of the sealing hole, ensuring that it can be completely and accurately filled to the bottom of the borehole, and improving the sealing quality.

[0011] By controlling the opening and closing of the sealing device and coordinating the upward movement of the guide tube, the groundwater accumulated in the water chamber is released in a timely manner, allowing it to fully contact the sealing material, helping the material to fully utilize its water absorption and expansion properties, achieving a more compact filling effect. Simultaneously, the compaction control device compacts the sealing material layer by layer through reciprocating motion, effectively reducing voids and improving the sealing density and stability.

[0012] In an optional embodiment, the sealing device includes: a pair of valves and a valve control device, the pair of valves are connected to the inner wall edge of the other end of the guide tube, and the valve control device is arranged on the valve.

[0013] Beneficial effects

[0014] The valve and its matching valve control device can effectively seal the bottom end of the guide tube, keeping the guide tube in a closed state during the filling process of the sealing material, effectively blocking the upwelling of groundwater and the premature release of the sealing material, and ensuring that the sealing material can be accurately transported to the bottom of the sealing hole.

[0015] In an optional embodiment, the guide tube includes an inner tube, an outer tube and a connecting wall, the inner tube is sleeved inside the outer tube, and the two ends of the inner tube are connected to the two ends of the outer tube through the connecting wall, and the drainage hole is opened on the connecting wall.

[0016] Beneficial effects

[0017] The annular cavity formed between the inner tube and the outer tube constitutes a water-containing cavity, and the drainage holes on the connecting wall are used to effectively guide and store groundwater.

[0018] In an optional embodiment, the compaction control device includes: a pressure control rod and a compaction column, one end of the pressure control rod is connected to the driving end of the lifting drive device, and the other end is connected to the compaction column.

[0019] In an optional embodiment, the inner wall of the guide tube is provided with guide teeth, the outer wall of the compaction column is provided with a guide groove, and the guide teeth are arranged in the guide groove.

[0020] In an optional embodiment, a strain gauge is provided between the pressure control rod and the compaction column, and the strain gauge is suitable for detecting the pressure value of the compaction column.

[0021] In an optional embodiment, a pressure gauge is provided on the pressure control rod, and the pressure gauge is suitable for detecting the pressure value of the pressure control rod.

[0022] In an optional embodiment, the sealing material is clay balls.

[0023] In a second aspect, the present invention further provides a geotechnical investigation drilling and sealing method, which is applied to the geotechnical investigation drilling and sealing device, and comprises the following steps:

[0024] After the geotechnical investigation and coring is completed, the lifting drive device drives the guide tube to be inserted into the bottom of the drill hole;

[0025] The sealing device at the bottom end of the guide pipe is closed, so that the groundwater is discharged into the water-containing cavity on the side wall of the guide pipe along the drainage hole;

[0026] The interior of the channel is in a dry state without water accumulation, and the guide tube is filled with sealing material;

[0027] The compaction control device is inserted into the channel of the guide tube, and the compaction control device is driven to reciprocate to preliminarily compact the sealing material;

[0028] The sealing device at the bottom end of the guide tube is opened, and the guide tube moves upward for a distance;

[0029] Part of the groundwater in the water-containing cavity flows out and combines with the sealing material;

[0030] The compaction control device continues to reciprocate to compact the sealing material again;

[0031] Repeat the steps of filling the sealing material into the guide tube and driving the compaction control device to continue reciprocating motion to compact the sealing material again until the sealing hole is filled with the sealing material or reaches a required pressure value.

[0032] Beneficial effects

[0033] The guide tube precisely delivers the sealing material to the bottom of the hole and performs preliminary compaction before it comes into contact with groundwater, effectively preventing the sealing material from absorbing water and expanding before reaching the bottom. The sealing device is then controlled to open, allowing groundwater in the water chamber to come into contact with the sealing material, fully combining the material and water, stimulating its expansion properties. Further compaction increases the filling density. Throughout the sealing process, the guide tube feeds the material in sections, and the compaction control device performs reciprocating compaction layer by layer, ensuring continuous and dense filling of the sealing material, significantly improving sealing quality and stability.

[0034] In an optional embodiment, the sealing device at the bottom end of the guide tube is opened, and in the step of the guide tube moving up a certain distance, the bottom surface of the guide tube is lower than the top surface of the sealing material each time the guide tube moves up.

[0035] Beneficial effects

[0036] Each time the guide tube moves upward, its bottom surface remains below the top surface of the sealing material. This effectively ensures that the compaction control device remains within the guide tube throughout the sealing process, preventing it from detaching from the guide tube and affecting the stability and continuity of the compaction operation. This also prevents groundwater from entering the guide tube and affecting the quality of the next sealing section. Furthermore, the compaction control device further compacts the sealing material that has already absorbed water and expanded, ensuring that the sealing material more fully fills the pores and improves the density and integrity of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic structural diagram of a geotechnical investigation drilling and sealing device according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic structural diagram of a guide tube according to an embodiment of the present invention;

[0040] Figure 3 Schematic diagram of the structure of the compaction control device according to an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. Lifting drive device;

[0043] 21. Guide tube, 211. Channel, 212. Drain hole, 213. Inner tube, 214. Outer tube, 215. Connecting wall, 22. Sealing device;

[0044] 3. Compression control device, 31. Pressure control rod, 32. Compression column, 321. Guide groove, 33. Strain gauge, 34. Pressure gauge;

[0045] 4. Sealing material;

[0046] 5. Soil layer. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0048] The following combination Figures 1 to 3 , describing embodiments of the present invention.

[0049] According to an embodiment of the present invention, on the one hand, a geotechnical exploration borehole sealing device is provided, comprising: a lifting drive device 1, a drainage guide mechanism and a compaction control device 3, the lifting drive device 1 is arranged above the borehole; the drainage guide mechanism comprises: a guide tube 21 and a sealing device 22, a channel 211 is opened in the middle of the guide tube 21, and drainage holes 212 are opened on the top and bottom surfaces of the guide tube 21, and a water-containing cavity is provided on its side wall, the top end of the guide tube 21 is connected to the lifting drive device 1, the lifting drive device 1 is suitable for driving the guide tube 21 to move along its axial direction in the sealing hole, the bottom end of the guide tube 21 is provided with a sealing device 22, the sealing device 22 has an opening and closing state of opening the bottom end opening of the channel 211 and a closing state of closing the bottom end opening of the channel 211; the compaction control device 3 is connected to the lifting drive device 1, the lifting drive device 1 is suitable for driving the compaction control device 3 to move along its axial direction in the channel 211 to compact the sealing material 4 put into the channel 211.

[0050] The drainage guide mechanism includes a hollow guide tube 21 and a sealing device 22 installed at its bottom end. The top and bottom surfaces of the guide tube 21 are provided with a plurality of drainage holes 212 in a circular array, and the interior of the side wall is provided with an annular water-holding cavity that can be used to temporarily store groundwater. The top end of the guide tube 21 is connected to the lifting drive device 1 via a connector. The lifting drive device 1 is a hydraulic lifting drive device 1, or it can be a drilling rig hydraulic device. The lifting drive device 1 places the guide tube 21 in the soil layer 5 where the drill hole has been opened. The lifting drive device 1 can drive the guide tube 21 to move up and down along the axis of the drill hole. The bottom end of the guide tube 21 is provided with a sealing device 22.

[0051] The sealing device 22 has two functional states: in the closed state, the sealing device 22 covers the bottom opening of the channel 211 of the guide tube 21 to prevent the sealing material 4 from contacting the groundwater in advance; in the open and closed state, the sealing device 22 opens the bottom channel 211 of the guide tube 21, allowing the material in the guide tube 21 to fall and contact the groundwater.

[0052] The compaction control device 3 is disposed in the channel 211 of the guide tube 21. Its upper end is connected to the other drive end of the lifting drive device 1, enabling reciprocating movement along the axial direction of the guide tube 21. During operation, the compaction control device 3 relies on the lifting drive device 1 to compact the filled sealing material 4, thereby increasing the sealing density.

[0053] After the sealing material 4 is filled and preliminarily compacted by the compaction control device 3, the sealing device 22 is opened, and the guide tube 21 moves upward for a distance driven by the lifting drive device 1. The groundwater in the water chamber flows out from the drainage hole 212 and merges with the sealing material 4, enhancing its expansion performance. After the sealing material 4 absorbs water and expands, the compaction control device 3 further compacts the sealing material 4 and pushes it into the sealing hole to complete the sealing work.

[0054] The guide tube 21 precisely delivers the sealing material 4 to the bottom of the borehole, effectively preventing unexpected expansion of the sealing material 4 due to premature contact with groundwater and ensuring the accuracy of the sealing operation. The sealing device 22 controllably closes or opens the bottom of the guide tube 21, precisely controlling the timing of contact between the sealing material 4 and groundwater. The compaction control device 3 reciprocates within the channel 211 of the guide tube 21, compacting the injected sealing material 4 layer by layer, significantly improving the sealing density, reducing porosity, and enhancing the continuity and density of the sealing layer.

[0055] In one embodiment, the guide tube 21 includes an inner tube 213, an outer tube 214 and a connecting wall 215. The inner tube 213 is sleeved inside the outer tube 214, and the two ends of the inner tube 213 are connected to the two ends of the outer tube 214 through the connecting wall 215. A drainage hole 212 is opened on the connecting wall 215.

[0056] Specifically, the outer tube 214 is hollow cylindrical, and the inner tube 213 is coaxially arranged inside the outer tube 214, forming an annular cavity structure, i.e., a water cavity, for temporarily storing groundwater collected after the guide tube 21 is inserted into the bottom of the hole.

[0057] The connecting wall 215 is an annular plate structure, the inner ring wall of which is connected to the outer wall of the inner layer tube 213, and the outer ring wall is connected to the inner wall of the outer layer tube 214. A plurality of drainage holes 212 are arranged in an array on the connecting wall 215. The drainage holes 212 are of moderate size to ensure that groundwater can smoothly enter the water storage chamber.

[0058] In one embodiment, the sealing device 22 includes: a pair of valves and a valve control device, the pair of valves are connected to the inner wall edge of the other end of the guide tube 21, and the valve control device is arranged on the valves.

[0059] Specifically, a pair of flaps are symmetrically arranged at the bottom end of the guide tube 21 and connected to the inner wall of the guide tube 21. The flaps are rotatable structures, one end of which is hinged to the edge of the inner wall of the channel 211 at the bottom of the guide tube 21. The other end fits together in the closed state to seal the bottom end of the channel 211. In the open state, they rotate to the sides of the guide tube 21, thereby opening the outlet of the channel 211 and releasing the sealing material 4 in the guide tube 21.

[0060] The valve control device is arranged on the outside of the valve, preferably adopting electric drive and having a remote control module installed inside. The construction personnel can remotely send control instructions to drive the valve to open or close, ensuring that the valve can be opened promptly and accurately after the filling material is filled and compacted, so that the bottom end of the guide tube 21 releases the sealing material 4, and guides the groundwater in the water cavity to fully combine with it, so as to give full play to the water absorption and expansion properties of the material.

[0061] In other embodiments, the number of the valves may also be set to multiple, and after the filling material is filled and compacted, the valve control device can control the valve to open.

[0062] In one embodiment, the compaction control device 3 includes: a pressure control rod 31 and a compaction column 32 . One end of the pressure control rod 31 is connected to the driving end of the lifting drive device 1 , and the other end is connected to the compaction column 32 .

[0063] Specifically, the pressure control rod 31 is a cylindrical rigid rod, one end of which is connected to the drive end of the lifting drive device 1 via a coupling, and the other end is fixedly connected to the compaction column 32. The compaction column 32 is a cylindrical component with a diameter slightly smaller than the inner diameter of the channel 211 of the guide tube 21. This ensures smooth reciprocating movement within the channel 211 and maintains sufficient contact with the inner wall of the guide tube 21 during the compaction process to prevent uneven compaction of the filling material. The lifting drive device 1 can drive the pressure control rod 31 to move up and down along the axial direction of the channel 211 of the guide tube 21, thereby driving the compaction column 32 to compact the sealing material 4 filled in the guide tube 21 layer by layer.

[0064] In one embodiment, the inner wall of the guide tube 21 is provided with guide teeth, the outer wall of the compacting column 32 is provided with a guide groove 321 , and the guide teeth are disposed in the guide groove 321 .

[0065] Specifically, to improve the guiding stability of the compaction control device 3 as it moves within the channel 211 of the guide tube 21, guide teeth extending axially are provided on the inner wall of the guide tube 21. These teeth are evenly distributed along the inner wall of the guide tube 21, forming a longitudinal guide rail structure. Correspondingly, guide grooves 321 are provided on the outer wall of the compaction column 32 to match the guide teeth. The guide grooves 321 are groove-shaped.

[0066] During the compaction process, the guide teeth engage with the guide grooves 321 on the compaction column 32, forming a sliding fit. When the lifting drive 1 drives the pressure control rod 31 to move the compaction column 32 up and down, the cooperation between the guide teeth and the guide grooves 321 effectively prevents the compaction column 32 from deflecting or rotating during movement, ensuring that it always moves stably along the axis of the guide tube 21, thereby improving the accuracy and consistency of the compaction operation of the sealing material 4.

[0067] In one embodiment, a strain gauge 33 is provided between the pressure control rod 31 and the compaction column 32 . The strain gauge 33 is suitable for detecting the pressure value of the compaction column 32 .

[0068] Specifically, the strain gauge 33 is a metal resistance strain gauge, which is installed at the connection between the pressure control rod 31 and the compression column 32 by bonding or welding. It can change resistance as the deformation of the part changes, thereby reflecting the pressure borne by the compression column 32.

[0069] Strain gauges 33 are connected to a ground monitoring system via wires, collecting real-time force data during the reciprocating motion of the compaction control device 3. Construction personnel can use this strain signal to determine whether the sealing material 4 is fully compacted and decide whether to continue adding material or increase the compaction frequency.

[0070] In one embodiment, a pressure gauge 34 is provided on the pressure control rod 31 , and the pressure gauge 34 is suitable for detecting the pressure value of the pressure control rod 31 .

[0071] Specifically, pressure gauge 34 is a mechanical or digital pressure sensor installed near the connection end of pressure control rod 31 to lift drive 1. It senses the axial pressure applied to pressure control rod 31 through its connection to the rod body. Pressure gauge 34 displays the compaction force delivered by pressure control rod 31 in real time. When the sealing material 4 is dense or expands to generate a significant reaction force, pressure gauge 34 promptly reflects abnormal pressure, prompting construction personnel to adjust the compaction rhythm or halt the compaction operation to prevent equipment overload and damage.

[0072] In one embodiment, the sealing material 4 is a clay ball sealing material 4 .

[0073] Specifically, the clay balls are primarily composed of sodium bentonite, with expanded perlite, quartz powder, or a binder optionally added to enhance their fluidity, cohesiveness, and compressive strength, depending on project requirements. The clay balls are granular or spherical, making them easy to fill through the guide tube 21 to the bottom of the hole when dry, without clogging the pipe or prematurely expanding.

[0074] During the sealing operation, sealing material 4 is dropped into the bottom of guide tube 21 and initially compacted by compaction control device 3. As sealing device 22 at the bottom of guide tube 21 opens and moves upward, groundwater in the water-holding cavity is partially released and comes into contact with sealing material 4, causing water absorption and expansion. The bentonite particles rapidly expand after absorbing water, fully filling the voids within the hole and forming a dense, continuous, and uniform sealing layer.

[0075] According to another aspect of an embodiment of the present invention, a geotechnical investigation drilling and sealing method is provided, which is applied to a geotechnical investigation drilling and sealing device, and includes the following steps:

[0076] After the geotechnical investigation and coring is completed, the lifting drive device 1 drives the guide tube 21 to be inserted into the bottom of the borehole;

[0077] The sealing device 22 at the bottom end of the guide pipe 21 is closed, allowing the groundwater to drain through the drainage hole 212 into the water-containing cavity on the side wall of the guide pipe 21;

[0078] The interior of the channel 211 is in a dry state without water accumulation, and the sealing material 4 is filled into the guide tube 21;

[0079] The compaction control device 3 is inserted into the channel 211 of the guide tube 21, and the compaction control device 3 is driven to reciprocate to preliminarily compact the sealing material 4;

[0080] The sealing device 22 at the bottom end of the guide tube 21 is opened, and the guide tube 21 moves upward for a distance;

[0081] Part of the groundwater in the water-containing cavity flows out and combines with the sealing material 4;

[0082] The compaction control device 3 continues to reciprocate and compact the sealing material 4 again;

[0083] Repeat the steps of filling the sealing material 4 into the guide tube 21 and driving the compaction control device 3 to continue reciprocating to compact the sealing material 4 again until the sealing holes are filled with the sealing material 4 or the required pressure value is reached.

[0084] Specifically, the guide tube 21 is first slowly inserted into the borehole through the lifting drive device 1. At this time, the sealing device 22 is in a closed state. During the insertion process of the guide tube 21, the drainage holes 212 opened at both ends thereof will guide the groundwater into the water holding cavity, preventing the groundwater from rising into the interior of the channel 211, thereby ensuring that the interior of the guide tube 21 is dry.

[0085] After the guide tube 21 is in place, the sealing material 4 in a dry state is filled into the interior of the channel 211 through its upper opening. After the filling is completed, the lifting drive device 1 drives the compaction control device 3 to be inserted into the channel 211 of the guide tube 21, and performs a reciprocating downward pressing motion to preliminarily compact the sealing material 4.

[0086] After the first round of compaction, the sealing device 22 at the bottom of the guide tube 21 is opened, and the guide tube 21 slowly moves upward for a distance. Some of the groundwater previously stored in the water chamber flows out of the drainage holes 212, coming into contact with the sealing material 4 and causing it to absorb water and expand. After the sealing material 4 has expanded, the compaction control device 3 is driven again to perform a reciprocating compaction motion along the axial direction of the channel 211, performing a secondary compaction on the expanded sealing material 4, further improving the sealing density.

[0087] The above steps can be repeated for multiple rounds according to the sealing depth, that is, refilling the sealing material 4, preliminary compaction, releasing groundwater, and recompacting until the entire borehole is filled.

[0088] In one embodiment, the sealing device 22 at the bottom end of the guide tube 21 is opened, and the guide tube 21 moves up a certain distance. Each time the guide tube 21 moves up, its bottom surface is lower than the top surface of the sealing material 4.

[0089] Specifically, in order to ensure that the compaction control device 3 is always inside the channel 211 of the guide tube 21 during the entire sealing process, and to prevent it from detaching from the guide structure and causing compaction to be out of control, the bottom surface position of the guide tube 21 is always lower than the top surface height of the current sealing material 4 each time it moves upward, ensuring that the compaction control device 3 is operated under control throughout the entire process, and to prevent the compaction column 32 from detaching from the guide teeth due to the guide tube 21 being lifted too high.

[0090] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A drilling and sealing device for geotechnical exploration, characterized in that: include: A lifting drive device (1), wherein the lifting drive device (1) is arranged above the drill hole; A drainage guide mechanism, comprising: a guide tube (21) and a sealing device (22); a channel (211) is provided in the middle of the guide tube (21); drainage holes (212) are provided on the top and bottom surfaces of the guide tube (21); a water-containing cavity is provided on the side wall; the top end of the guide tube (21) is connected to the lifting drive device (1); the lifting drive device (1) is suitable for driving the guide tube (21) to move along its axial direction in the borehole; the bottom end of the guide tube (21) is provided with the sealing device (22); the sealing device (22) has an open state for opening the bottom end opening of the channel (211) and a closed state for closing the bottom end opening of the channel (211); A compaction control device (3) is connected to the lifting drive device (1), and the lifting drive device (1) is suitable for driving the compaction control device (3) to move along its axial direction in the channel (211) to compact the sealing material (4) put into the channel (211).

2. The geotechnical exploration drilling and sealing device according to claim 1, characterized in that: The sealing device (22) comprises: a pair of flaps and a flap control device, wherein the pair of flaps are connected to the inner wall edge of the other end of the guide tube (21), and the flap control device is arranged on the flaps.

3. The geotechnical exploration drilling and sealing device according to claim 2, characterized in that: The guide tube (21) comprises an inner tube (213), an outer tube (214) and a connecting wall (215); the inner tube (213) is sleeved inside the outer tube (214), and the two ends of the inner tube (213) are connected to the two ends of the outer tube (214) via the connecting wall (215); the drain hole (212) is provided on the connecting wall (215).

4. The geotechnical exploration drilling and sealing device according to claim 1, characterized in that: The compaction control device (3) comprises a pressure control rod (31) and a compaction column (32), one end of the pressure control rod (31) is connected to the driving end of the lifting drive device (1), and the other end is connected to the compaction column (32).

5. The geotechnical exploration drilling and sealing device according to claim 4, characterized in that: The inner wall of the guide tube (21) is provided with guide teeth, the outer wall of the compacting column (32) is provided with a guide groove (321), and the guide teeth are arranged in the guide groove (321).

6. The geotechnical investigation drilling and sealing device according to claim 5, characterized in that: A strain gauge (33) is provided between the pressure control rod (31) and the compaction column (32), and the strain gauge (33) is suitable for detecting the pressure value of the compaction column (32).

7. The geotechnical investigation drilling and sealing device according to claim 6, characterized in that: The pressure control rod (31) is provided with a pressure gauge (34), and the pressure gauge (34) is suitable for detecting the pressure value of the pressure control rod (31).

8. The geotechnical exploration drilling and sealing device according to claim 1, characterized in that: The sealing material (4) is clay balls.

9. A geotechnical investigation drilling and sealing method, applied to the geotechnical investigation drilling and sealing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: After the geotechnical investigation and coring is completed, the lifting drive device (1) drives the guide tube (21) to be inserted into the bottom of the borehole; The sealing device (22) at the bottom end of the guide pipe (21) is closed, so that the groundwater is discharged into the water-containing cavity on the side wall of the guide pipe (21) along the drainage hole (212); The interior of the channel (211) is in a dry state without water accumulation, and a sealing material (4) is filled into the guide tube (21); The compaction control device (3) is inserted into the channel (211) of the guide tube (21), and the compaction control device (3) is driven to reciprocate to preliminarily compact the sealing material (4); The sealing device (22) at the bottom end of the guide tube (21) is opened, and the guide tube (21) moves upward for a distance; Part of the groundwater in the water-containing cavity flows out and combines with the sealing material (4); The compaction control device (3) continues to reciprocate to compact the sealing material (4) again; Repeat the step of filling the sealing material (4) into the guide tube (21) until the compaction control device (3) is driven to continue reciprocating motion to compact the sealing material (4) again, until the sealing hole is filled with the sealing material (4) or the required pressure value is reached.

10. The geotechnical investigation drilling and sealing method according to claim 9, characterized in that: The sealing device (22) at the bottom end of the guide tube (21) is opened, and the guide tube (21) moves up a certain distance. Each time the guide tube (21) moves up, its bottom surface is lower than the top surface of the sealing material (4).

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