CN214374128U - Test device for measuring permeability coefficient of on-site fine soil - Google Patents

Test device for measuring permeability coefficient of on-site fine soil Download PDF

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Publication number
CN214374128U
CN214374128U CN202022285562.9U CN202022285562U CN214374128U CN 214374128 U CN214374128 U CN 214374128U CN 202022285562 U CN202022285562 U CN 202022285562U CN 214374128 U CN214374128 U CN 214374128U
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China
Prior art keywords
pore
pressure meter
drill rod
fixed
thermometer
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Expired - Fee Related
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CN202022285562.9U
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Chinese (zh)
Inventor
林桂武
林志南
李海平
常志凯
李东
谢永君
徐佳力
杨佳伟
覃卉
马瑞艺
王丁乙
祁航翔
陈泓帆
梁澜馨
陈龙
陈鹏宇
李双
柴啟武
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Liuzhou Investment Holding Co ltd
Guangxi University of Science and Technology
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Liuzhou Investment Holding Co ltd
Guangxi University of Science and Technology
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Priority to CN202022285562.9U priority Critical patent/CN214374128U/en
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Abstract

A test device for measuring the permeability coefficient of on-site fine grained soil is characterized in that the upper part of a cutting ring is connected with a water storage barrel, a drill rod support is fixed in the water storage barrel, a drill rod extending downwards is fixed on the drill rod support, a second pore water pressure meter is fixed at the lower end of the drill rod, and a drill bit is fixed at the lower end of the second pore water pressure meter; a guide rail is sleeved on the drill rod, and a first pore water pressure meter and a thermometer are fixed on the guide rail; the signal of the first pore water pressure meter and the signal of the second pore water pressure meter are connected with pore pressure acquisition elements, and the signal of the thermometer is connected with a temperature acquisition element. Since the first pore hydraulic pressure meter and the thermometer can move upwards along with the increase of the thickness of the measured soil layer, the thermometer and the pore hydraulic pressure meter are ensured to be kept on the upper surface of the measured soil layer. The annular cutter has the advantages that the annular cutter can effectively reduce the seepage of water to the periphery, and the measurement precision of the permeability coefficient is improved; the automatic measurement of the water head is realized through the pore water pressure meter and the pore pressure acquisition element; automatic measurement of the water head is realized through the thermometer and the temperature acquisition element.

Description

Test device for measuring permeability coefficient of on-site fine soil
Technical Field
The utility model relates to a geotechnical engineering fine grained soil permeability test field, in particular to test device of on-spot fine grained soil permeability coefficient of survey.
Background
Coefficient of permeability
Figure DEST_PATH_IMAGE001
The conductivity coefficient is also called as hydraulic conductivity coefficient, is an important index for reflecting the permeability of soil body, and can represent the difficulty of fluid passing through a pore framework. The existing method for measuring the permeability coefficient of fine grained soil generally adopts a single-ring method in a test pit water injection method, water can diffuse around in a field test, the measurement precision is greatly reduced, in addition, tools such as an iron ring, an iron frame and a bucket need to be prepared in the traditional field test, the operation is complex, and more personnel are needed to operate on the spot in the test process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a realize in the field test automatic and improve measurement accuracy's on-spot fine grain soil permeability coefficient's of survey test device.
The utility model discloses a solution is such:
the utility model discloses to on-spot osmotic coefficient calculation principle as follows:
Figure 31423DEST_PATH_IMAGE002
(1)
Figure DEST_PATH_IMAGE003
(2)
in the formula:
Figure 52731DEST_PATH_IMAGE004
- -irrigation bucket area (c)m2);
Figure DEST_PATH_IMAGE005
-the percolation diameter (cm) is equal to the thickness of the soil layer into which the storage tank is driven;
Figure 991737DEST_PATH_IMAGE006
-initial head (cm);
Figure DEST_PATH_IMAGE007
-head of water (cm) at termination;
Figure 377981DEST_PATH_IMAGE008
Figure DEST_PATH_IMAGE009
- -kinetic viscosity coefficients of water at T ℃ and 20 ℃ (1X 10)-6kPa·s)。
According to the principle, the utility model discloses a test device for determining permeability coefficient of on-site fine grained soil, the water storage barrel is connected on the upper portion of cutting ring, fixed drilling rod support in the water storage barrel, the drilling rod that the drilling rod support was stretched downwards is fixed, and the second pore hydraulic pressure meter is fixed to the drilling rod lower extreme, and the drill bit is fixed to second pore hydraulic pressure meter lower extreme; the drill rod is sleeved with the guide rail, so that the guide rail moves along the drill rod when being pushed by external force, and the first pore water pressure meter and the thermometer are fixed on the guide rail; the signal of the first pore water pressure meter and the signal of the second pore water pressure meter are connected with pore pressure acquisition elements, and the signal of the thermometer is connected with a temperature acquisition element; because the first pore hydraulic pressure meter and the thermometer are fixed on the guide rail, the first pore hydraulic pressure meter and the thermometer can move upwards along with the increase of the thickness of the measured soil layer, and the thermometer and the pore hydraulic pressure meter are guaranteed to be kept on the upper surface of the measured soil layer.
The more specific technical scheme also comprises the following steps: the drill rod support is fixed on the inner side wall of the water storage barrel, and the drill rod is fixed in the middle of the drill rod support.
Further: the top surface of the second pore water pressure meter is flush with the bottom surface of the water storage barrel, so that the accuracy of calculating the thickness of the soil layer to be measured is guaranteed.
Further: the pore pressure acquisition element is fixed on the outer side of the barrel wall at the top of the water storage barrel.
Further: the temperature acquisition element is fixed on the outer side of the top barrel wall of the water storage barrel.
By adopting the structure, the parameters in the formulas (1) and (2) can be automatically monitored through the first pore water pressure meter and the pore pressure acquisition element, so that the water head change is obtained; the thickness of the soil layer hit by the water storage barrel can be calculated by the difference value of the first pore hydraulic pressure meter and the second pore hydraulic pressure meter, so that the length of the seepage diameter L is obtained, the top surface of the second pore hydraulic pressure meter is flush with the bottom surface of the water storage barrel, and the water head difference between the top surface of the soil layer to be measured and the ground can be accurately measured; the temperature can be automatically monitored by measuring the water temperature by the thermometer and the temperature acquisition element.
The utility model has the advantages that the cutting ring can effectively reduce the seepage of water to the periphery and improve the measurement precision of the permeability coefficient; the automatic measurement of the water head is realized through the pore water pressure meter and the pore pressure acquisition element; the temperature of the thermometer and the temperature acquisition element is used for realizing the automatic monitoring of the water temperature pair.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a schematic structural view of the cutting ring 11.
The parts of the drawings are detailed as follows: the device comprises a water storage barrel 1, a drill rod support 2, a drill rod 3, a guide rail 4, a first pore water pressure meter 5, a drill bit 6, a second pore water pressure meter 7, a thermometer 8, a temperature acquisition element 9, a pore pressure acquisition element 10 and a cutting ring 11.
Detailed Description
As shown in fig. 1, 2 and 3, the upper part of the cutting ring 11 of the present invention is connected with a water storage barrel 1, the water storage barrel 1 is internally fixed with a drill rod support 2, the drill rod support 2 is fixed with a drill rod 3 extending downwards, the lower end of the drill rod 3 is fixed with a second pore hydraulic pressure meter 7, and the lower end of the second pore hydraulic pressure meter 7 is fixed with a drill bit 6; the drill rod 3 is sleeved with the guide rail 4, so that after the guide rail 4 drills into soil through the drill bit 6, the thrust of the soil pushes the guide rail 4 to move along the drill rod 3, and the first pore water pressure meter 5 and the thermometer 8 are fixed on the guide rail 4; the first pore water pressure meter 5 and the second pore water pressure meter 7 are connected with pore pressure acquisition elements 10 through signals, and the thermometer 8 is connected with a temperature acquisition element 9 through signals. Since the first pore hydraulic pressure gauge and the thermometer are fixed on the guide rail, the first pore hydraulic pressure gauge and the thermometer can move upwards along with the increase of the thickness of the measured soil layer, and the thermometer and the pore hydraulic pressure gauge 5 are guaranteed to be kept on the upper surface of the measured soil layer.
Wherein: the drill rod support 2 adopts an upper drill rod support and a lower drill rod support, the upper drill rod support and the lower drill rod support are distributed in a cross shape, the drill rod 3 is fixed in the middle of the upper drill rod support 2 and the lower drill rod support 2, and the top surface of the second pore hydraulic pressure meter 7 is flush with the bottom surface of the water storage barrel 1, so that the accuracy of calculating the thickness of the soil layer to be measured is ensured; the pore pressure acquisition element 10 and the temperature acquisition element 9 are fixed on the outer side of the top barrel wall of the water storage barrel 1.
The utility model discloses a theory of operation does: excavating a test pit with the area not less than 1.0m multiplied by 1.5 m in a test area, leveling the bottom of the pit, driving the water storage barrel 1 into a soil layer by 15 cm-30 cm, and preventing the compaction or deformation of the original soil body when the water storage barrel is driven into the soil body, wherein if the disturbance is too large, the test pit needs to be excavated again for another work;
after the water storage barrel is impacted by 15-30 cm, paving a gravel layer with the thickness of 2cm on the top surface of the soil body, wherein the original pore pressure 7-1 is indicated by the second pore water pressure meter 7, and the original pore pressure 7-1 is the pore pressure in fine soil, and then injecting clean water into the water storage barrel until the water storage barrel is full;
after a certain period of time, the water pressure change trends of the first pore water pressure meter 5 and the second pore water pressure meter 7 are consistent, at the moment, the soil layer seepage between the first pore water pressure meter 5 and the second pore water pressure meter 7 is stable, the test is immediately finished, and the water in the water storage barrel 1 is pumped out;
the first pore water pressure meter 5 and the pore pressure acquisition element 10 are used for obtaining the water head of the water storage barrel
Figure 458064DEST_PATH_IMAGE006
And finallyHead of water at end of time
Figure 594647DEST_PATH_IMAGE007
Obtaining pore pressure 5-1 through the first pore hydraulic pressure meter 5, subtracting original pore pressure 7-1 of fine grained soil obtained by the second pore hydraulic pressure meter 7 and pore pressure 7-2 obtained by the second pore hydraulic pressure meter 7 when seepage is stable, and obtaining seepage diameter L; namely: the seepage diameter L = (pore pressure 5-1) — (original pore pressure of fine soil 7-1+ pore pressure 7-2 when seepage is stable).
The real-time water temperature change curve during the test period can be obtained through the thermometer 6 and the real-time temperature monitoring element 9.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and those skilled in the art can make various changes or modifications to the equivalent embodiments without departing from the scope of the present invention, and all changes and modifications that may be made to the above embodiments based on the technical spirit of the present invention are within the scope of the present invention.

Claims (5)

1. The utility model provides a test device of survey on-spot fine grain soil permeability coefficient which characterized in that: the upper part of the cutting ring (11) is connected with a water storage barrel (1), a drill rod support (2) is fixed in the water storage barrel (1), the drill rod support (2) is fixed with a drill rod (3) extending downwards, the lower end of the drill rod (3) is fixed with a second pore water pressure meter (7), and the lower end of the second pore water pressure meter (7) is fixed with a drill bit (6); the drill rod (3) is sleeved with the guide rail (4), so that the guide rail (4) moves along the drill rod (3) when being pushed by external force, and the first pore water pressure meter (5) and the thermometer (8) are fixed on the guide rail (4); the signal of the first pore water pressure meter (5) and the signal of the second pore water pressure meter (7) are connected with pore pressure acquisition elements (10), and the signal of the thermometer (8) is connected with a temperature acquisition element (9).
2. The test device for determining the permeability coefficient of the fine soil on site according to claim 1, wherein: the drill rod support (2) is fixed on the inner side wall of the water storage barrel (1), and the drill rod (3) is fixed in the middle of the drill rod support (2).
3. The test device for determining the permeability coefficient of the fine soil on site according to claim 1, wherein: the top surface of the second pore water pressure meter (7) is flush with the bottom surface of the water storage barrel (1), so that the accuracy of calculating the thickness of the soil layer to be measured is ensured.
4. The test device for determining the permeability coefficient of the fine soil on site according to claim 1, wherein: the pore pressure acquisition element (10) is fixed on the outer side of the top barrel wall of the water storage barrel (1).
5. The test device for determining the permeability coefficient of the fine soil on site according to claim 1, wherein: the temperature acquisition element (9) is fixed on the outer side of the top barrel wall of the water storage barrel (1).
CN202022285562.9U 2020-10-14 2020-10-14 Test device for measuring permeability coefficient of on-site fine soil Expired - Fee Related CN214374128U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022285562.9U CN214374128U (en) 2020-10-14 2020-10-14 Test device for measuring permeability coefficient of on-site fine soil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022285562.9U CN214374128U (en) 2020-10-14 2020-10-14 Test device for measuring permeability coefficient of on-site fine soil

Publications (1)

Publication Number Publication Date
CN214374128U true CN214374128U (en) 2021-10-08

Family

ID=77968206

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022285562.9U Expired - Fee Related CN214374128U (en) 2020-10-14 2020-10-14 Test device for measuring permeability coefficient of on-site fine soil

Country Status (1)

Country Link
CN (1) CN214374128U (en)

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Granted publication date: 20211008