A static penetration probe and method for in-situ soil carbon assessment

Abstract

The present invention relates to the field of static penetration probes and discloses a static penetration probe and method for in-situ soil carbon assessment. The probe comprises a probe lower shell and a probe upper shell disposed at the upper end of the probe lower shell. The probe lower shell is provided with a pore water pressure probe for detecting pore water pressure. The probe upper shell surface is provided with an optical window and an electrode ring for measuring soil electrical properties. The probe upper shell is provided with a diffuse reflection light emitter for emitting and receiving diffuse reflection light, a controller, and a temperature monitor for measuring the temperature around the static penetration probe. When gravel needs to be cleaned, an air compressor is started to deliver high-pressure gas to a pressurized chamber. The pressurized gas is then transferred to a plug ring through a connecting pipe. The plug ring evenly sprays the high-pressure gas onto the gravel accumulation area at the lower end of the pore water pressure probe. The impact force of the high-pressure gas can effectively blow away and discharge the gravel attached to the surface of the pore water pressure probe.

Description

Technical Field

[0001] The present invention relates to the field of static penetration probes, and in particular to a static penetration probe and method for in-situ soil carbon assessment. Background Art

[0002] The Cone Penetration Test (CPT) is an in-situ testing technique widely used in geotechnical engineering investigations. A probe equipped with a sensor is pressed into the soil at a constant speed to measure the cone tip resistance (qc), sidewall friction (fs), and pore water pressure (u2). Parameters such as CPT are used to evaluate soil mechanical properties, delineate soil strata, and predict foundation bearing capacity. The CPT probe measures the pressure during penetration into the soil using a pore water pressure probe. However, the pore water pressure probe is mounted at the lower end of the CPT probe. When the CPT probe is pressed down, soil accumulates on the probe's port. While this allows for effective detection during the initial test, gravel in the soil can adhere to the probe's surface. If the pressure is too strong, larger gravel can become lodged between the CPT probe and the probe's end faces, preventing it from being expelled, thus hindering subsequent CPT use. Summary of the Invention

[0003] The present invention provides a static penetration probe and method for in-situ soil carbon assessment, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A static penetration probe for in-situ soil carbon assessment includes a probe lower shell and a probe upper shell disposed at the upper end of the probe lower shell. A pore water pressure probe for detecting pore water pressure is disposed within the probe lower shell. An optical window and an electrode ring for measuring soil electrical properties are disposed on the surface of the probe upper shell. A diffuse reflection light emitter for emitting and receiving diffuse reflection light, a controller, and a temperature monitor for measuring the ambient temperature of the static penetration probe are disposed within the probe upper shell. The diffuse reflection light emitter and the optical window are at the same horizontal height so that light is emitted toward the optical window by the diffuse reflection light emitter and received by a spectrometer disposed on the side of the diffuse reflection light emitter. The diffuse reflection light emitter, the electrode ring, the temperature monitor, and the spectrometer are all signal-connected to the controller.

[0006] A chamber for installing a pore water pressure probe is provided in the lower housing of the probe. The pore water pressure probe is installed in the chamber and is covered with a sealing plate. A pressurized cleaning assembly is provided on the surface of the sealing plate. The pressurized cleaning assembly is connected to the lower part of the chamber so as to remove sand and gravel at the lower end of the pore water pressure probe through the pressurized cleaning assembly.

[0007] The boost cleaning assembly includes an air compressor, a boost chamber, a connecting pipe and a plug ring. The air compressor and the boost chamber are arranged on the end face of the sealing plate, and the plug ring is arranged on the surface of the chamber close to the lower end of the pore water pressure probe, and the connecting pipe is abutted against the lower end edge of the pore water pressure probe, and the boost chamber is connected to the plug ring through the connecting pipe.

[0008] In a preferred technical solution, the connecting pipe is composed of an upper pipe body and a lower pipe body, and the inner diameter of the upper pipe body is larger than the inner diameter of the lower pipe body.

[0009] A preferred technical solution is that the plug ring is an annular structure, and an air flow channel is provided inside the plug ring. The air flow channel is connected to the connecting pipe through a connecting port set at the upper end of the plug ring, and an opening is provided on the surface of the plug ring close to the pore water pressure probe. The lower end of the opening extends toward the pore water pressure probe, and the upper end edge of the opening is abutted against the lower end surface of the opening.

[0010] A preferred technical solution is that the rotating array inside the plug ring has multiple magnetic groups, each magnetic group is provided with magnet block 1 and magnet block 2, magnet block 1 is arranged on the upper surface of the inner side of the plug ring close to the opening, and magnet block 2 is arranged on the lower surface of the inner side of the plug ring close to the opening, magnet block 1 and magnet block 2 are magnetically detailed, and when magnet block 1 and magnet block 2 are adsorbed, the upper and lower ends of the opening are abutted and closed, and when the pressure in the boost chamber and the connecting pipe is greater than the adsorption force when magnet block 1 and magnet block 2 are adsorbed, the opening opens.

[0011] In a preferred technical solution, the pressurized chamber includes an outer shell, a support body, and a pressurized airbag. The support body is installed in the outer shell. The pressurized airbag is fixed to the support body by a fixing plate 1, and the support body is fixed to the outer shell by a fixing plate 2. The support body is respectively connected to the air compressor and the plug ring.

[0012] An expansion notch is provided at the upper end of the support body, and the surface of the boost airbag close to the expansion notch is raised. When the air compressor increases the pressure in the boost airbag and the pressure in the boost airbag is not greater than the adsorption force when the magnetic block one and the magnetic block two are adsorbed, the boost airbag expands toward the expansion notch.

[0013] In a preferred technical solution, the support body is provided with an extended cover plate near the expansion notch, the extended cover plate covers the expansion notch, and there is a distance between the extended cover plate and the pressurized airbag.

[0014] A method for using a static penetration probe, applicable to a static penetration probe for in-situ soil carbon assessment, wherein the static penetration probe is mounted on a drive mechanism and uniformly pressed into the soil. The pore water pressure in the surrounding area is detected by a pore water pressure probe at the bottom of the probe lower shell. A diffuse reflection light emitter disposed in the probe upper shell emits diffuse reflection light toward an optical window, which is then irradiated toward the optical window onto the soil surface surrounding the probe upper shell. The diffuse reflection light is received by a spectrometer, and the intensity of light of different wavelengths in the soil is measured to obtain a corresponding spectral curve.

[0015] Among them, after the static penetration probe is pressed into the soil and measured, air is pumped into the booster cavity through the air compressor set in the lower shell of the probe to increase the internal pressure of the booster airbag and make the booster airbag expand outward until the internal pressure of the booster airbag is greater than the suction force of the magnetic block one and the magnetic block two in the plug ring. Then, the air is ejected outward along the opening set on the surface of the plug ring, and the gravel or debris dirt at the lower end of the pore water pressure probe is taken out.

[0016] Compared with the existing technology, this technical solution has the following advantages:

[0017] When gravel removal is necessary, the air compressor starts, pumping high-pressure gas into the booster chamber. The pressurized gas is then transferred to the plug ring via a connecting pipe. The plug ring evenly sprays the high-pressure gas onto the gravel accumulation area at the bottom of the pore-water pressure probe. The impact of the high-pressure gas effectively disperses and removes the gravel adhering to the surface of the pore-water pressure probe, thus resolving the gravel accumulation problem. This design not only removes gravel but also prevents damage to the pore-water pressure probe. It also ensures that the probe can measure pore water pressure properly in subsequent use, thereby improving the reliability and service life of the static penetration probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 This is an overall diagram of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the internal structure.

[0021] Figure 3 for Figure 2 Schematic diagram of the structure from another perspective.

[0022] Figure 4 Schematic diagram of the pressurized cleaning component.

[0023] Figure 5 Schematic diagram of the outer shell.

[0024] Figure 6 This is a cross-sectional view of the plug ring.

[0025] Figure 7 for Figure 6 Enlarged schematic diagram of point a in the middle.

[0026] In the figure: probe lower shell 1, pore water pressure probe 11, booster cleaning assembly 12, sealing plate 13;

[0027] Air compressor 121, booster chamber 122, connecting pipe 123, plug ring 124;

[0028] Outer shell 221, support body 222, extended cover plate 2221, pressurized airbag 223, fixing plate 1 224, fixing plate 225;

[0029] Communication port 241, magnetic block 1 242, magnetic block 2 243;

[0030] Diffuse reflection light emitter 21 , optical window 22 , electrode ring 23 , controller 24 , temperature monitor 25 , spectrometer 26 . DETAILED DESCRIPTION

[0031] like Figures 1 to 7 As shown, the present invention proposes a static penetration probe for in-situ soil carbon assessment, including a probe lower shell 1 and a probe upper shell 2 arranged at the upper end of the probe lower shell 1. A pore water pressure probe 11 for detecting pore water pressure is provided in the probe lower shell 1. An optical window 22 and an electrode ring 23 for measuring soil electrical properties are provided on the surface of the probe upper shell 2. A diffuse reflection light emitter 21 for emitting and receiving diffuse reflection light, a controller 24 and a temperature monitor 25 for measuring the ambient temperature of the static penetration probe are provided in the probe upper shell 2. The diffuse reflection light emitter 21 and the optical window 22 are at the same horizontal height, so that light is emitted toward the optical window 22 by the diffuse reflection light emitter 21 and the light is received by a spectrometer 26 arranged on the side of the diffuse reflection light emitter 21. The diffuse reflection light emitter 21, the electrode ring 23, the temperature monitor 25 and the spectrometer 26 are all signal-connected to the controller 24.

[0032] The probe lower housing 1 is provided with a chamber for installing a pore water pressure probe 11. The pore water pressure probe 11 is installed in the chamber and is covered with a sealing plate 13. A pressurized cleaning assembly 12 is provided on the surface of the sealing plate 13. The pressurized cleaning assembly 12 is connected to the lower part of the chamber so that sand and gravel at the lower end of the pore water pressure probe 11 can be removed through the pressurized cleaning assembly 12.

[0033] The boost cleaning assembly 12 includes an air compressor 121, a boost chamber 122, a connecting pipe 123 and a plug ring 124. The air compressor 121 and the boost chamber 122 are arranged on the end face of the sealing plate 13, and the plug ring 124 is arranged on the surface of the chamber close to the lower end of the pore water pressure probe 11, and the connecting pipe 123 is abutted against the lower end edge of the pore water pressure probe 11, and the boost chamber 122 is connected to the plug ring 124 through the connecting pipe 123.

[0034] In the present invention, the pressurized cleaning assembly 12 is a key device for solving the problem of gravel accumulation at the lower end of the pore water pressure probe 11. When the static penetration probe is pressed down in the rock and soil, the gravel in the soil tends to accumulate on the port surface of the pore water pressure probe 11. In particular, larger particles of gravel may get stuck between the probe and the end face of the pore water pressure probe 11, thereby affecting the subsequent measurement accuracy and the service life of the probe. To solve this problem, the pressurized cleaning assembly 12 works in the following manner: the air compressor 121 is the power source of the entire cleaning system, which can generate high-pressure gas. These high-pressure gases are transported to the pressurized chamber 122. The function of the pressurized chamber 122 is to further increase the pressure of the gas, thereby providing sufficient power for the cleaning process. The connecting pipe 123 connects the pressurized chamber 122 with the plug ring 124 to ensure that the high-pressure gas can be smoothly transferred to the position of the plug ring 124. The plug ring 124 is arranged on the surface of the chamber near the lower end of the pore water pressure probe 11 and is against the lower end edge of the pore water pressure probe 11, so as to ensure that the high-pressure gas can directly act on the gravel accumulation area at the lower end of the pore water pressure probe 11.

[0035] When gravel needs to be removed, the air compressor 121 starts, delivering high-pressure gas to the boost chamber 122. The pressurized gas is then transferred to the plug ring 124 through the connecting pipe 123. The plug ring 124 evenly sprays the high-pressure gas onto the gravel accumulation area at the lower end of the pore water pressure probe 11. The impact force of the high-pressure gas effectively blows away and discharges the gravel attached to the surface of the pore water pressure probe 11, thereby resolving the gravel accumulation problem. This design not only removes gravel but also avoids damage to the pore water pressure probe 11. It also ensures that the probe can normally measure pore water pressure in subsequent use, thereby improving the reliability and service life of the static penetration probe.

[0036] Furthermore, the communicating tube 123 is composed of an upper tube body and a lower tube body, and the inner diameter of the upper tube body is larger than the inner diameter of the lower tube body.

[0037] Among them, the plug ring 124 is an annular structure, and an air flow channel is provided in the plug ring 124. The air flow channel is connected to the connecting pipe 123 through a connecting port 241 provided at the upper end of the plug ring 124, and an opening is provided on the surface of the plug ring 124 close to the pore water pressure probe 11. The lower end of the opening extends toward the pore water pressure probe 11, and the upper end edge of the opening is abutted against the lower end surface of the opening.

[0038] First, the design purpose of the upper edge of the opening being against the lower edge of the opening is mainly to optimize the injection direction and effect of the high-pressure gas. After the high-pressure gas enters the air flow channel of the plug ring 124 through the connecting pipe 123, it is ejected from the opening. Since the upper edge of the opening is against the lower edge, the gas will form a downward oblique airflow when it is ejected. This oblique airflow can more directly impact the gravel accumulation area at the lower end of the pore water pressure probe 11, thereby more effectively blowing away and discharging the gravel. This design makes the injection direction of the high-pressure gas more concentrated and precise, avoids the scattering of the gas during ejection, and improves the cleaning efficiency.

[0039] Secondly, the design of the lower end of the opening being longer than the upper end is mainly to prevent gravel from entering the inside of the plug ring 124. In actual use, when the static penetration probe is pressed down in the rock and soil, the gravel in the soil may approach the plug ring 124 with the flow of gas or the vibration of the probe. If the opening design is unreasonable, the gravel may be sucked into the air flow channel of the plug ring 124, causing the air flow channel to be blocked, thereby affecting the normal injection and cleaning effect of the high-pressure gas. By designing the lower end of the opening to be longer than the upper end, a structure similar to a "bell mouth" can be formed. This structure can generate a certain reverse airflow when the gas is ejected, preventing gravel from entering the inside of the plug ring 124. At the same time, the longer lower end opening can also better cover the gravel accumulation area at the lower end of the pore water pressure probe 11, ensuring the uniformity and comprehensiveness of the cleaning effect.

[0040] Furthermore, the rotating array inside the plug ring 124 has multiple magnetic groups, each of which is provided with a magnet 1 242 and a magnet 2 243. The magnet 1 242 is arranged on the upper surface of the inner side of the plug ring 124 close to the opening, and the magnet 2 243 is arranged on the lower surface of the inner side of the plug ring 124 close to the opening. The magnets 1 242 and 243 are magnetically coupled, and when the magnet 1 242 and the magnet 2 243 are adsorbed, the upper and lower ends of the opening are abutted and closed. When the pressure in the boost chamber 122 and the connecting pipe 123 is greater than the adsorption force when the magnet 1 242 and the magnet 2 243 are adsorbed, the opening opens.

[0041] The magnetic assembly within the plug ring 124 further optimizes the high-pressure gas injection effect and system efficiency. Magnets 1 242 and 243 within the magnetic assembly interact magnetically to close and expand the opening. This mechanism not only effectively prevents sand and gravel from entering the plug ring 124, but also optimizes the airflow injection intensity by adjusting the opening's opening. When the opening is closed, magnets 1 242 and 243 attract each other, tightly abutting the top and bottom ends of the opening and closing them.

[0042] At this point, the air flow path inside the plug ring 124 is completely isolated from the outside world, forming a closed chamber. This closed state is intended to increase the air pressure inside the plug ring 124. When the air compressor 121 delivers high-pressure gas to the boost chamber 122 and into the air flow path of the plug ring 124 through the connecting pipe 123, the gas cannot immediately be ejected from the opening because the opening is closed by the magnetic block. Therefore, gas continuously accumulates inside the plug ring 124, causing the internal pressure to gradually increase. This pressurization process is a key step in increasing the intensity of the airflow jet. When the pressure inside the plug ring 124 reaches a certain value, exceeding the attraction force between magnetic block 1 242 and magnetic block 2 243, the opening is forcibly pushed open by the high-pressure gas. At this point, the high-pressure gas is instantly ejected from the opening, forming a high-intensity airflow. This high-intensity airflow can more effectively impact the sand and gravel at the lower end of the pore water pressure probe 11, blowing it away and expelling it, thereby achieving a more thorough cleaning effect.

[0043] Furthermore, the pressurized chamber 122 includes an outer shell 221, a support body 222, and a pressurized airbag 223. The support body 222 is installed in the outer shell 221. The pressurized airbag 223 is fixed to the support body 222 via a first fixing plate 224, and the support body 222 is fixed to the outer shell 221 via a second fixing plate 225. The support body 222 is respectively connected to the air compressor 121 and the plug ring 124.

[0044] An expansion notch is provided at the upper end of the support body 222, and the surface of the boost airbag 223 near the expansion notch is raised. When the air compressor 121 increases the pressure in the boost airbag 223, and the pressure in the boost airbag 223 is not greater than the adsorption force when the magnetic block 1 242 and the magnetic block 2 243 are adsorbed, the boost airbag 223 expands toward the expansion notch.

[0045] As the static penetration probe is pressed downward, gravel in the soil may move closer to the plug ring 124 as the probe moves. If the opening remains open, the gravel could be drawn into the air flow path of the plug ring 124, blocking the air flow path and affecting the normal injection and cleaning effect of the high-pressure gas. The adsorption effect of magnetic blocks 142 and 243 keeps the opening closed under normal circumstances, effectively preventing gravel from entering the plug ring 124 and ensuring unobstructed air flow.

[0046] When the air compressor 121 delivers high-pressure gas to the boost airbag 223, the gas first accumulates in the boost airbag 223. Due to the adsorption force of magnet block 1 242 and magnet block 2 243, the opening remains closed at the initial stage of pressurization. At this time, the pressure in the boost airbag 223 gradually increases, but the gas cannot be ejected from the opening immediately. This closed state allows the gas to continuously accumulate in the boost airbag 223, forming a high-pressure environment. When the pressure in the boost airbag 223 reaches a certain value and exceeds the adsorption force between magnet block 1 242 and magnet block 2 243, the opening will be forcibly pushed open by the high-pressure gas. At this time, the high-pressure gas is instantly ejected from the opening, forming a high-intensity airflow. This high-intensity airflow can more effectively impact the sand and gravel at the lower end of the pore water pressure probe 11, blow it away and discharge it, thereby achieving a more thorough cleaning effect.

[0047] In addition, the support body 222 is provided with an extended cover plate 2221 near the expansion notch. The extended cover plate 2221 covers the expansion notch, and there is a distance between the extended cover plate 2221 and the pressurized airbag 223 .

[0048] Based on the above technical solution, the present invention also proposes a method for using a static penetration probe, which is applied to the static penetration probe for in-situ soil carbon assessment. When in use, the static penetration probe is installed on the driving mechanism and evenly pressed into the soil. The pore water pressure of the surrounding area is detected by the pore water pressure probe 11 at the bottom of the probe lower shell 1, and the diffuse reflection light emitter 21 provided in the probe upper shell 2 emits diffuse reflection light toward the optical window 22. The diffuse reflection light is irradiated toward the optical window 22 and onto the soil surface around the probe upper shell 2. The diffuse reflection light is received by the spectrometer 26, the intensity of light of different wavelengths in the soil is measured, and the corresponding spectral curve is obtained.

[0049] Among them, after the static penetration probe is pressed into the soil and measured, air is pumped into the booster cavity 122 through the air compressor 121 arranged in the lower shell 1 of the probe to increase the internal pressure of the booster airbag 223 and make the booster airbag 223 expand outward until the internal pressure of the booster airbag 223 is greater than the suction force of the magnetic block 1 242 and the magnetic block 2 243 in the plug ring 124. Then, the air is ejected outward along the opening set on the surface of the plug ring 124, and the gravel or debris dirt at the lower end of the pore water pressure probe 11 is taken out.

[0050] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A static penetration probe for in-situ soil carbon assessment, characterized in that: The probe comprises a lower shell of the probe and an upper shell of the probe provided at the upper end of the lower shell of the probe. A pore water pressure probe for detecting aperture water pressure is provided in the lower shell of the probe. An optical window and an electrode ring for measuring soil electrical properties are provided on the surface of the upper shell of the probe. A diffuse reflection light emitter, a controller and a temperature monitor for measuring the temperature around the static penetration probe are provided in the upper shell of the probe for emitting and receiving diffuse reflection light. The diffuse reflection light emitter and the optical window are at the same horizontal height so that light is emitted toward the optical window through the diffuse reflection light emitter and received by a spectrometer provided on the side of the diffuse reflection light emitter. The diffuse reflection light emitter, the electrode ring, the temperature monitor and the spectrometer are all signal-connected to the controller. A chamber for installing a pore water pressure probe is provided in the lower housing of the probe. The pore water pressure probe is installed in the chamber and is covered with a sealing plate. A pressurized cleaning assembly is provided on the surface of the sealing plate. The pressurized cleaning assembly is connected to the lower part of the chamber so as to remove sand and gravel at the lower end of the pore water pressure probe through the pressurized cleaning assembly. The pressurized cleaning assembly includes an air compressor, a pressurized cavity, a connecting pipe, and a plug ring. The air compressor and the pressurized cavity are arranged on the end surface of the sealing plate, and the plug ring is arranged on the surface of the chamber near the lower end of the pore water pressure probe. The connecting pipe abuts against the lower end edge of the pore water pressure probe, and the pressurized cavity is connected to the plug ring through the connecting pipe. The rotating array inside the plug ring has multiple magnetic groups, each of which is provided with magnet block 1 and magnet block 2. Magnet block 1 is arranged on the upper surface of the inner side of the plug ring close to the opening, and magnet block 2 is arranged on the lower surface of the inner side of the plug ring close to the opening. Magnet block 1 and magnet block 2 are magnetically coupled, and when magnet block 1 and magnet block 2 are adsorbed, the upper and lower ends of the opening are abutted and closed. When the pressure in the boost chamber and the connecting pipe is greater than the adsorption force when magnet block 1 and magnet block 2 are adsorbed, the opening opens.

2. The static penetration probe for in-situ soil carbon assessment according to claim 1, characterized in that: The communicating tube is composed of an upper tube body and a lower tube body, and the inner diameter of the upper tube body is greater than the inner diameter of the lower tube body.

3. The static penetration probe for in-situ soil carbon assessment according to claim 2, characterized in that: The plug ring is an annular structure, and an air flow channel is provided inside the plug ring. The air flow channel is connected to the connecting pipe through a connecting port provided at the upper end of the plug ring, and an opening is provided on the surface of the plug ring close to the pore water pressure probe. The lower end of the opening extends toward the pore water pressure probe, and the upper end edge of the opening is abutted against the lower end surface of the opening.

4. The static penetration probe for in-situ soil carbon assessment according to claim 3, characterized in that: The pressurized cavity includes an outer shell, a support body, and a pressurized airbag. The support body is installed in the outer shell. The pressurized airbag is fixed to the support body by a fixing plate 1, and the support body is fixed to the outer shell by a fixing plate 2. The support body is respectively connected to the air compressor and the plug ring. An expansion notch is provided at the upper end of the support body, and the surface of the boost airbag close to the expansion notch is raised. When the air compressor increases the pressure in the boost airbag and the pressure in the boost airbag is not greater than the adsorption force when the magnetic block one and the magnetic block two are adsorbed, the boost airbag expands toward the expansion notch.

5. The static penetration probe for in-situ soil carbon assessment according to claim 4, characterized in that: The support body is provided with an extended cover plate near the expansion notch, the extended cover plate covers the expansion notch, and there is a distance between the extended cover plate and the pressurized airbag.

6. A method for using a static penetration probe, applied to the static penetration probe for in-situ soil carbon assessment according to claim 5, characterized in that: The static penetration probe is installed on the driving mechanism and evenly pressed into the soil. The pore water pressure of the surrounding area is detected by the pore water pressure probe at the bottom of the probe lower shell. The diffuse reflection light emitter set in the probe upper shell emits diffuse reflection light toward the optical window. The diffuse reflection light is irradiated toward the optical window and onto the soil surface around the probe upper shell. The diffuse reflection light is received by the spectrometer, and the intensity of light of different wavelengths in the soil is measured to obtain the corresponding spectral curve. Among them, after the static penetration probe is pressed into the soil and measured, air is pumped into the booster cavity through the air compressor set in the lower shell of the probe to increase the internal pressure of the booster airbag and make the booster airbag expand outward until the internal pressure of the booster airbag is greater than the suction force of the magnetic block one and the magnetic block two in the plug ring. Then, the air is ejected outward along the opening set on the surface of the plug ring, and the gravel or debris dirt at the lower end of the pore water pressure probe is taken out.

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