CN204129038U - Observation of The Suction device in a kind of consolidation test - Google Patents
Observation of The Suction device in a kind of consolidation test Download PDFInfo
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- CN204129038U CN204129038U CN201420419141.2U CN201420419141U CN204129038U CN 204129038 U CN204129038 U CN 204129038U CN 201420419141 U CN201420419141 U CN 201420419141U CN 204129038 U CN204129038 U CN 204129038U
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- tensiometer
- sample box
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- test
- fixed head
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Abstract
The utility model discloses Observation of The Suction device in a kind of consolidation test, entirety is made up of four circular parts of stainless steel, is followed successively by from top to bottom: sample box, test unit base, tensiometer fixed head and cushion block.A ring-shaped rubber packing ring is padded to ensure the sealing of sample box between sample box and test unit base interface.Notch cuttype is processed in tensiometer fixed head central authorities, and cushion block supporting upper load, tensiometer routing hole is reserved in its underpart.The utility model device achieves and jointly carry out consolidation parameters and the measurement of suction parameter in the consolidation test of unsaturated soil; Make the soil body and tensiometer fit tightly and adopt rubber diaphragm to prevent moisture from evaporating and ensure measurement accuracy, there is economical and practical, easy and simple to handle, easy to use, the reliable advantage of measurement.
Description
Technical field
Patent of the present invention to relate in the experiment of a kind of indoor unsaturated soils theory for measuring the device of soil body matric suction, especially discloses a kind of device and the using method thereof that in unsaturated soil consolidation test, had not only measured consolidation parameters but also measure soil body suction parameter.
Background technology
In Observation of The Suction technology, apply more mainly following four kinds at present: whole translation method, tensiometer method, filter paper method and electric heating conduction sensor method.Wherein tensiometer technology directly can measure negative pore water pressure, and when pore air pressure equals atmospheric pressure, negative pore water pressure equals matric suction.The degree of accuracy of tensiometer measurement result depends on whether contact well between the soil body with tensiometer.Therefore, in the shop experiment of reality, for measuring the suction in the soil body, be generally that the ceramic head of tensiometer (water-filling is saturated) is directly inserted in the soil body.
But, the ceramic head of tensiometer is directly inserted in soil both also ensureing and contact good not a duck soup.First, the ceramic head on tensiometer is more fragile, and easily broken, slightly do not note during insertion just likely damaging, this point more easily occurs in testing in the wild.Secondly, if the soil body and ceramic head loose contact good, measurement range will be subject to the impact of " cavitation erosion " phenomenon.Therefore, be necessary design a kind of device or adopt a kind of method, just can ensure that the soil body contacts on good basis with tensiometer both ensureing tensiometer to be inserted in soil, again can the impermeability of assurance device and watertightness good, there will not be " cavitation erosion " phenomenon.
If soil body suction will be measured with tensiometer in the consolidation test of unsaturated soil, obtain consolidation parameters and suction parameter simultaneously, directly tensiometer is inserted in the limited soil sample of size and will affect measurement: tensiometer inserts in the soil body, its effect is equivalent to stake and inserts in soil, directly affects consolidation test result; Consolidation test xial feed is passed to tensiometer by the soil body, and its action effect will directly affect Observation of The Suction value.
Based on the needs of Observation of The Suction in the limitation of the above tensiometer and unsaturated soil consolidation test, design this consolidation test Observation of The Suction device and using method thereof.
Summary of the invention
The present invention is intended to provide a kind of Simple And Practical, easy and simple to handle, measurement Observation of The Suction device accurately.On the basis in conjunction with existing Observation of The Suction technology, prior art is optimized and improvement, to reach economical and practical, easy and simple to handle, easy to use, the reliable object of measurement.
The scheme that this patent solves above-mentioned Observation of The Suction technology is:
Observation of The Suction device in a kind of consolidation test, entirety is made up of four circular stainless steel components, is followed successively by from top to bottom: sample box 1, test unit base 2, tensiometer fixed head 4 and cushion block 6; Connect fastening between each several part with hexagon socket head cap screw; It is the smooth straight cylindrical cavity for holding soil sample to be detected of inside surface in the middle of sample box 1.Around sample box, even ground auger six is for being connected fastening M5 threaded hole with device pedestal.
Sample box and device pedestal interface are lined with a ring-shaped rubber packing ring to ensure the sealing of sample box; Sample box and device pedestal adopt equally distributed six interior hexagonal M5 bolts to carry out seamless fastening.
Described test unit base, is processed by cylindrical stainless steel.According to the difference of selected tensiometer type and size, the mounting hole of the tensiometer being adapted to select is processed in centre, to insert tensiometer.In the present embodiment, tensiometer mounting hole is processed into the size being applicable to install Imperial College type tensiometer.Device pedestal plays a part to form a connecting link, and by bolt, Observation of The Suction device four part is connected into entirety.
Described tensiometer fixed head, is processed by cylindrical corrosion resistant plate, and external diameter should be slightly larger and be convenient to be fixed as with gland bonnet suitable than tensiometer mounting hole.Notch cuttype is processed in tensiometer fixed head central authorities, forms the shape closely sealed with gland bonnet; Brill three M4 threaded holes of outer ring even circumferential, for fastening with test unit base.
Described test unit base and tensiometer fixed head M4 bolt carry out fastening, and the tensiometer mounting hole of closely sealed rear formation, for installation tension meter.
Described cushion block, is processed by cylindrical stainless steel, and its Main Function is supporting upper load.For saving material and weight reduction, centre can be processed into hollow, and tensiometer routing hole is reserved in bottom.
Described test unit base and cushion block three M5 bolted, make top build and be all supported on cushion block, bear the upper load in process of the test.Xial feed is realized by the charger (as lever-loading, hydraulic loaded etc.) of consolidometer.
Observation of The Suction device in consolidation test of the present invention, forms the space of a highly about 1.5cm above the soil body with one piece of black rubber film during use, prevent moisture evaporation and air pressure impacts pore air pressure in process of the test, thus may affect test findings.
Apparatus of the present invention, by the tight joint of soil sample bottom tension meter upper surface, ensure the accuracy of measurement, avoid in shop experiment that tensiometer to be inserted the measurement caused in soil inaccurate.
Apparatus of the present invention are optimized and improvement in conjunction with existing Observation of The Suction technology, economical and practical, easy and simple to handle, measurement is reliable.Multinomial about in the subject study of unsaturated soils theory, through many experiments checking, the indoor soil body suction value result recorded by Observation of The Suction device and using method thereof in this consolidation test is more accurate.
Present invention achieves in the consolidation test of unsaturated soil and jointly carry out consolidation test and the measurement of suction parameter, its advantage is mainly reflected in: one is the tight joint by soil sample bottom tension meter upper surface, ensure the accuracy of measurement, avoid in shop experiment that tensiometer to be inserted the measurement caused in soil inaccurate; Two is the spaces forming a highly about 1.5cm with one piece of black rubber film above the soil body, and preventing moisture evaporation and air in process of the test from entering affects test findings.
Accompanying drawing explanation
Fig. 1 is Observation of The Suction apparatus structure schematic diagram in consolidation test.
Fig. 2 is the elevation drawing of sample box; Fig. 3 is the planimetric map of sample box.
Fig. 4 is the elevation drawing of device pedestal; Fig. 5 is the planimetric map of device pedestal.
Fig. 6 is tensiometer fixed head elevation drawing; Fig. 7 is the planimetric map of tensiometer fixed head.
Fig. 8 is the elevation drawing of cushion block; Fig. 9 is the planimetric map of cushion block.
Figure 10 is the schematic diagram using Observation of The Suction measurement device suction in this consolidation test in the present embodiment.
In figure: 1 is sample box, 2 is measuring equipment bases, 3 is rubber washers, 4 is tensiometer fixed heads, 5 is Imperial College type tensiometers, 6 is cushion blocks, and 7 is M5 hexagon socket head cap screws, for sample box, fastening bolt between cushion block and device pedestal, 8 is M4 hexagon socket head cap screws, for the fastening bolt between device pedestal and tensiometer fixed head, 9 is routing holes, and 10 is black rubber films, 11 is M5 threaded holes, 12 is M4 threaded holes, and 13 is be applicable to Imperial College type tensiometer mounting hole, 14 soil samples to be detected.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment, count example to install Imperial College type tension force in the Observation of The Suction device of this type, the present invention and using method thereof are described in detail.
Fig. 1 to Fig. 9 gives the structural representation of Observation of The Suction device in consolidation test and the elevation drawing of each thin portion component and planimetric map.Observation of The Suction device in a kind of consolidation test, assemble primarily of four parts of stainless steel, these four critical pieces are: sample box, device pedestal, tensiometer fixed head, cushion block.Wherein device pedestal plays a part to connect sample box, tensiometer fixed head and cushion block, and the latter is connected into entirety by hexagon socket head cap screw and the former.
Described sample box 1, cylindrical cavity is processed in centre, for holding soil sample 14 to be detected.Even ground auger six M5 threaded holes 11 around sample box, for being connected fastening with device pedestal 2.When installing sample box 1 and device pedestal 2, being impermeability and the water-retaining property of soil sample 14 to be detected in assurance device, ring groove should being driven on base 2, to install rubber washer 3.During simultaneous machining device base, strictly should control the planarization with soil sample surface of contact, fit completely in the surface of such guarantee tensiometer 5 and the surface of soil sample 14, thus guarantee the accuracy of test.
Described tensiometer fixed head 4, external diameter should be slightly larger and be convenient to be fixed as suitable with base 2 than tensiometer mounting hole 13.Notch cuttype is processed in tensiometer fixed head 4 central authorities, forms the shape closely sealed with base; Brill three M4 threaded holes 12 of outer ring even circumferential, for fastening with base.
Described cushion block 6, its Main Function is supporting upper member and loading load.For saving material and weight reduction, centre can be processed into hollow, and tensiometer routing hole 9 is reserved in bottom.Device pedestal 2 and cushion block 6 three M5 bolted are connected.
Before carrying out Observation of The Suction, to install all parts: first tensiometer fixed head 4 is installed, form closely sealed tensiometer mounting hole 13 with device pedestal 2; Secondly inserted in mounting hole by tensiometer 5 (tensiometer should carry out saturated before using), the power lead of tensiometer and p-wire are connected with external instrument by routing hole 9, and ensure tensiometer upper surface and base end face seamless combination, prevent gas leakage of leaking; Then rubber washer 3 and sample box 1 are installed; Finally mounted all component placement above, on cushion block, are connected fastening cushion block 6 and base 2 by six M5 bolts, the installation of whole Observation of The Suction device.
When carrying out Observation of The Suction, its implementation method can be as shown in Figure 10.Wherein vertical load is applied by the vertical load bar of consolidometer.Soil sample 14 to be detected is placed in sample box 1, then placed on it for a lighter lid of conducting oneself with dignity, and ensures that lid freely can slide up and down in sample box.Being fixed on lid by applying the piston of vertical load subsequently, finally one piece of black rubber film 10 being covered soil and lid, its Main Function avoids soil water to divide evaporation and the suction change that causes and cause the inaccurate of measurement result.It should be noted that: black rubber film is not close to lid, but leave " airbag " space of a high about 1.5cm around.If the interstitial air pressure in experimentation in soil test is greater than atmospheric pressure, gas will be pressed against in this " airbag ", and the air pressure value in soil can continue to keep null value, ensures that the numerical value that tensiometer measures is exactly soil suction.In implementation process, hierarchical loading is carried out to the soil body, when the soil body in sample box 14 reaches certain Set criteria, wait for that suction value is stablized, after record reading, then apply next stage load.
In this invention, ensureing that the measure of measurement accuracy mainly contains two: one is tight joint by soil sample bottom tension meter upper surface, ensure the accuracy of measurement, avoid in shop experiment that tensiometer to be inserted the measurement caused in soil inaccurate; Two is the spaces forming a highly about 1.5cm with one piece of black rubber film above the soil body, and preventing moisture evaporation and air in process of the test from entering affects test findings.
Claims (3)
1. Observation of The Suction device in a consolidation test, it is characterized in that, entirety is made up of four circular stainless steel components, is followed successively by from top to bottom: sample box (1), test unit base (2), tensiometer fixed head (4) and cushion block (6); Connect fastening between each several part with hexagon socket head cap screw;
Be the smooth straight cylindrical cavity for holding soil sample to be detected of inside surface in the middle of described sample box 1, around sample box, even ground auger six is for being connected fastening M5 threaded hole with device pedestal.
2. Observation of The Suction device in consolidation test according to claim 1, is characterized in that, sample box and device pedestal interface are lined with a ring-shaped rubber packing ring to ensure the sealing of sample box; Sample box and device pedestal adopt equally distributed six interior hexagonal M5 bolts to carry out seamless fastening.
3. Observation of The Suction device in consolidation test according to claim 1, is characterized in that, described tensiometer fixed head external diameter than tensiometer mounting hole slightly large so that and gland bonnet fix; Notch cuttype is processed in tensiometer fixed head central authorities, forms the shape closely sealed with gland bonnet; Three, the brill of outer ring even circumferential is for M4 threaded hole fastening with test unit base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419141.2U CN204129038U (en) | 2014-07-28 | 2014-07-28 | Observation of The Suction device in a kind of consolidation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419141.2U CN204129038U (en) | 2014-07-28 | 2014-07-28 | Observation of The Suction device in a kind of consolidation test |
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| CN204129038U true CN204129038U (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420419141.2U Withdrawn - After Issue CN204129038U (en) | 2014-07-28 | 2014-07-28 | Observation of The Suction device in a kind of consolidation test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165981A (en) * | 2014-07-28 | 2014-11-26 | 西南交通大学 | Suction measuring device in consolidation test |
| CN112415174A (en) * | 2020-10-27 | 2021-02-26 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
-
2014
- 2014-07-28 CN CN201420419141.2U patent/CN204129038U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165981A (en) * | 2014-07-28 | 2014-11-26 | 西南交通大学 | Suction measuring device in consolidation test |
| CN104165981B (en) * | 2014-07-28 | 2015-11-25 | 西南交通大学 | Observation of The Suction device in a kind of consolidation test |
| CN112415174A (en) * | 2020-10-27 | 2021-02-26 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
| CN112415174B (en) * | 2020-10-27 | 2021-09-14 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150128 Effective date of abandoning: 20151125 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |