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 PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- pore
- pressure meter
- drill rod
- fixed
- thermometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002689 soil Substances 0.000 title claims abstract description 36
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 230000035699 permeability Effects 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000011148 porous material Substances 0.000 claims abstract description 70
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000005553 drilling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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
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 permeabilityThe 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:
in the formula:
-the percolation diameter (cm) is equal to the thickness of the soil layer into which the storage tank is driven;
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 barrelAnd finallyHead of water at end of time。
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).
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) |
-
2020
- 2020-10-14 CN CN202022285562.9U patent/CN214374128U/en not_active Expired - Fee Related
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN104831762B (en) | Deep basal pit artesian water precipitation dynamic monitoring system and monitoring method | |
CN107764713B (en) | range-adjustable double-ring infiltration device and soil permeability coefficient in-situ test method | |
CN103278376B (en) | Test device of stability control model of earth pressure balance shield excavation surface | |
CN100596318C (en) | Mass concrete structure deep pore reinforced construction method | |
CN105369812A (en) | Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain | |
CN112814060A (en) | Grooving machine for underground grouting continuous wall construction and construction method | |
CN214374128U (en) | Test device for measuring permeability coefficient of on-site fine soil | |
WO2019033467A1 (en) | Range-adjustable dual-ring infiltration apparatus and in-situ testing method for soil permeability coefficient | |
CN106013267B (en) | A kind of vertical anti-pulling concrete model stake and its method of construction and application | |
CN108612546B (en) | Horizontal grouting construction method in closed environment | |
CN114703854B (en) | Construction method of dam in water conservancy and hydropower engineering | |
CN206034512U (en) | Bored concrete pile of driling under water construction monitoring devices | |
CN208506279U (en) | A kind of auger underground water level detecting device | |
CN208235610U (en) | cast-in-situ bored pile sediment thickness measuring tool | |
CN207423212U (en) | Inclinometer pipe datum mark school geodesic structure | |
CN217332054U (en) | Device for monitoring mud density in real time | |
CN215005385U (en) | Be applied to monitoring devices for soil and water conservation of making fields in silt region | |
CN213391965U (en) | Drilling platform is used in road bridge construction | |
CN204008399U (en) | A kind of soil permeability coefficient is measured integrated apparatus in batches | |
CN210917378U (en) | Extruding-expanding cast-in-place pile equipment | |
CN204112334U (en) | Reserved shield crossing combined type foundation pit exterior-protected device | |
CN108680483B (en) | Soil body in-situ permeability coefficient measuring device and testing method | |
CN210439337U (en) | Device for detecting height of cast-in-situ bored pile in excess irrigation in real time | |
CN112813950A (en) | Multi-section hydraulic monitoring method for automatically monitoring vertical displacement of ground surface around foundation pit | |
CN112064646A (en) | Foundation pit supporting structure with foundation pit construction parameter measurement function |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211008 |