CN205015059U - A device for water -level fluctuation of measurationing among laboratory model testing - Google Patents
A device for water -level fluctuation of measurationing among laboratory model testing Download PDFInfo
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- CN205015059U CN205015059U CN201520644266.XU CN201520644266U CN205015059U CN 205015059 U CN205015059 U CN 205015059U CN 201520644266 U CN201520644266 U CN 201520644266U CN 205015059 U CN205015059 U CN 205015059U
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Abstract
The utility model relates to a device for water -level fluctuation of measurationing among laboratory model testing, including upper end open -ended barrel, be equipped with silt in the barrel and pack the chamber, silt is packed the intracavity and is equipped with the drain bar, is gone up the chimney filter of the vertical setting that the lower extreme is sealed, and silt is packed the chamber upper end and is equipped with the sand bedding course that the upper surface was stamped the seal membrane, and the drain bar upper end sets up in the sand bedding course, and chimney filter upper end and sand bedding course lower extreme leave the distance, evenly seted up the inlet opening on the chimney filter wall, chimney filter outer wall parcel filter layer, be equipped with the float that is linked to each other and is constituteed by cursory and magnet in the chimney filter, the outside of the barrel of float correspondence is equipped with the compass, the utility model discloses can be under the rupturable atmospheric condition, record the water -level fluctuation condition in the indoor model under the negative pressure condition, the shortcoming and the unsafe problem of test of loss vacuum energy is revealed to vacuum when having solved the test of conventional pressure -measuring pipe.
Description
Technical field
The utility model relates to a kind of device for measuring SEA LEVEL VARIATION in indoor model test, belongs to the technical field in Soft Ground engineering test.
Background technology
During Vacuum Preloading Method for Consolidation of Soft Soil Foundation, the change of underground water table is the focus of academia's arguement and difference always, and many scholars carried out research to this, but did not finally reach an agreement.At present, the opened type test tube method test stabilization zone underground water table adopting routine in engineering, the essence of the SEA LEVEL VARIATION reflection measured by it is the mean value of water level pipe chimney filter section each point drawdown more.During the test of this method, the mouth of pipe opens wide, and water level pipe air pressure inside is communicated with air, causes the marked change of water level pipe surrounding soil Pore Pressure.Therefore, test out SEA LEVEL VARIATION can only reflect normal atmospheric pressure under analog value, it is not the actual value of underground water table in ground under negative pressure of vacuum condition, and water level testing time is more during vacuum preloading, the error caused is larger, so this method the test of underground water table under not being suitable for vacuum preloading condition.
Zhang Gongxin etc. propose a kind of water level pipe endoporus that utilizes and press meter and vacuum meter reading to calculate the measuring technology of true WATER LEVEL CHANGES value, and this technology energy follow-on test underground water table and do not affect its test result, method of testing makes much progress, but this technology needs to carry out inverse WATER LEVEL CHANGES value according to hole pressure meter and vacuum meter reading, belong to indirect test method, lack intuitive, and test result affects significantly by vacuum tightness.
The patented technology that Hohai University's ground is developed, introduce one and be suitable for underground water table test new method under vacuum preloading condition, proving installation is made up of parts such as internal and external casing, magnet ring buoy, stop, bayonet socket, sealing cap, electric inductors, the method is owing to adopting the unique design of inner and outer pipes, successfully solve the problem that water level pipe inside communicates with air, be equipped with magnet ring buoy simultaneously and can directly measure underground water table position, test result is intuitive and reliable, so the underground water table result under the vacuum preloading condition recorded by this method in stabilization zone has more cogency.But the method also has some problems.In water level pipe, pipe adopts disposable making shaping, can not adopt conventional pipe-connecting mode, make it produce, transport and bury underground and be restricted, and length is relatively limited again.For the WATER LEVEL CHANGES monitoring existing problems that the degree of depth is darker, be further improved.In indoor model test, this device is installed complicated, and cost is higher, and its action condition restive, use the method to have certain limitation.
Utility model content
The purpose of this utility model is to provide a kind of device for measuring SEA LEVEL VARIATION in indoor model test, this is used for measuring in indoor model test that the device to test of SEA LEVEL VARIATION is simple, structure simple, it is simple to install, cost is lower, can under isolated atmospheric condition, record the SEA LEVEL VARIATION situation in indoor model under condition of negative pressure, when solving the test of conventional piezometric tube, vacuum tightness reveals shortcoming and the inaccurate problem of test of loss vacuum energy.
In order to realize foregoing invention object, a kind of device for measuring SEA LEVEL VARIATION in indoor model test of the present utility model comprises the cylindrical shell of upper end open, be provided with mud in cylindrical shell and fill chamber, mud is filled in chamber and is provided with drain bar, the chimney filter of the vertical setting of upper and lower side sealing, mud is filled upper end, chamber and is provided with the sand bedding course that upper surface is stamped diaphragm seal, drain bar upper end is arranged in sand bedding course, distance is left in chimney filter upper end and sand bedding course lower end, described chimney filter wall evenly offers inlet opening, chimney filter outer wall parcel filtering layer, be provided with by the cursory float be connected to form with magnet in described chimney filter, the outside of the cylindrical shell that float is corresponding is provided with compass.
Described chimney filter is pvc pipe.
Described chimney filter internal diameter is 15-20mm.
Described filtering layer is geotechnological filter cloth.
Described magnet is Nd-Fe-B permanent magnet.
The two poles of the earth, north and south horizontal positioned of described magnet, magnet diameter is 10mm, is highly 10mm.
Adopting this device for measuring SEA LEVEL VARIATION in indoor model test, having the following advantages:
1, this apparatus structure is simple, and material is simply general, and Installation And Test is simple;
2, this device is built in the soil body, does not communicate with external atmosphere pressure, can under isolated atmospheric condition, records the SEA LEVEL VARIATION situation in indoor model under condition of negative pressure;
3, this device is embedded in and intends in the soil body of stabilization zone, solves vacuum tightness when conventional piezometric tube is tested and reveals the shortcoming of loss vacuum energy;
4, the change in location of water level directly pointed out by application guide pin, more intuitively, truly, to understand in pre-compaction process consolidation situation in the soil body more accurately.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the structural representation of a kind of device for measuring SEA LEVEL VARIATION in indoor model test of the utility model;
Fig. 2 is the enlarged drawing of chimney filter in the utility model.
Wherein have: 1. cylindrical shell; 2. mud fills chamber; 3. sand bedding course; 4. drain bar; 5. chimney filter; 6. inlet opening; 7. filtering layer; 8. cursory; 9. magnet; 10. compass; 11. water levels.
Embodiment
Fig. 1, a kind of device for measuring SEA LEVEL VARIATION in indoor model test shown in Fig. 2, comprise the cylindrical shell 1 of upper end open, be provided with mud in cylindrical shell 1 and fill chamber 2, mud is filled in chamber 2 and is provided with drain bar 4, the chimney filter 5 of the vertical setting of upper and lower side sealing, mud is filled upper end, chamber 2 and is provided with the sand bedding course 3 that upper surface is stamped diaphragm seal, drain bar 4 upper end is arranged in sand bedding course 3, distance is left in chimney filter 5 upper end and sand bedding course 3 lower end, described chimney filter 5 wall evenly offers inlet opening 6, chimney filter 5 outer wall parcel filtering layer 7, the float be connected to form with magnet 9 by cursory 8 is provided with in described chimney filter 5, the outside of the cylindrical shell 1 that float is corresponding is provided with compass 10, float floats on the water surface in chimney filter 5, free lifting is changed with water level 11, compass 10 can indicate the position of float outside cylindrical shell 1.
Described chimney filter 5 is pvc pipe.
Described chimney filter 5 internal diameter is 15-20mm.
Described filtering layer 7 is geotechnological filter cloth.
Described magnet 9 is Nd-Fe-B permanent magnet.
The two poles of the earth, north and south horizontal positioned of described magnet 9, magnet 9 diameter is 10mm, is highly 10mm.
During enforcement, filled mud in cylindrical shell 1 after, this device entirety be vertically embedded in and intend in soil mass consolidation, chimney filter 5 mouthfuls of upper ends are to the reserved segment distance of sand bedding course 3, and after ensureing silt settling, chimney filter 5 does not pass the diaphragm seal on sand bedding course 3.During concrete measurement, after first the cylindrical shell 1 filling in mud being left standstill 24 hours, indicate the first position of cursory 8 by compass 10, then start to vacuumize ground preloading to mud and sand bedding course 3.Can indicate the position of cursory 8 in precompressed processing procedure, the discrepancy in elevation of this position and first position is the change of water level 11.
The technical characteristic described in detail is not had to be prior art in the application.Above-described embodiment is the principle of illustrative the application and effect thereof only, but not for limiting the application.Any person skilled in the art scholar all under the spirit and category of the application, can modify above-described embodiment or changes.Therefore, have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the application discloses, must be contained by the claim of the application.
Claims (6)
1. one kind for measuring the device of SEA LEVEL VARIATION in indoor model test, it is characterized in that: the cylindrical shell comprising upper end open, be provided with mud in cylindrical shell and fill chamber, mud is filled in chamber and is provided with drain bar, the chimney filter of the vertical setting of upper and lower side sealing, mud is filled upper end, chamber and is provided with the sand bedding course that upper surface is stamped diaphragm seal, drain bar upper end is arranged in sand bedding course, distance is left in chimney filter upper end and sand bedding course lower end, described chimney filter wall evenly offers inlet opening, chimney filter outer wall parcel filtering layer, be provided with by the cursory float be connected to form with magnet in described chimney filter, the outside of the cylindrical shell that float is corresponding is provided with compass.
2. according to the device for measuring SEA LEVEL VARIATION in indoor model test according to claim 1, it is characterized in that: described chimney filter is pvc pipe.
3. according to the device for measuring SEA LEVEL VARIATION in indoor model test according to claim 1, it is characterized in that: described chimney filter internal diameter is 15-20mm.
4. according to the device for measuring SEA LEVEL VARIATION in indoor model test according to claim 1, it is characterized in that: described filtering layer is geotechnological filter cloth.
5. according to the device for measuring SEA LEVEL VARIATION in indoor model test according to claim 1, it is characterized in that: described magnet is Nd-Fe-B permanent magnet.
6. according to the device for measuring SEA LEVEL VARIATION in indoor model test according to claim 1, it is characterized in that: the two poles of the earth, north and south horizontal positioned of described magnet, magnet diameter is 10mm, is highly 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520644266.XU CN205015059U (en) | 2015-08-21 | 2015-08-21 | A device for water -level fluctuation of measurationing among laboratory model testing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520644266.XU CN205015059U (en) | 2015-08-21 | 2015-08-21 | A device for water -level fluctuation of measurationing among laboratory model testing |
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| CN205015059U true CN205015059U (en) | 2016-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175976A (en) * | 2021-05-20 | 2021-07-27 | 扬州大学 | Low water level measuring device for model test |
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2015
- 2015-08-21 CN CN201520644266.XU patent/CN205015059U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175976A (en) * | 2021-05-20 | 2021-07-27 | 扬州大学 | Low water level measuring device for model test |
| CN113175976B (en) * | 2021-05-20 | 2023-11-21 | 扬州大学 | Low water level measuring device for model test |
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