CN203337448U - Device for shortening back pressure saturation and consolidation time in triaxial test - Google Patents
Device for shortening back pressure saturation and consolidation time in triaxial test Download PDFInfo
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- CN203337448U CN203337448U CN2013204183229U CN201320418322U CN203337448U CN 203337448 U CN203337448 U CN 203337448U CN 2013204183229 U CN2013204183229 U CN 2013204183229U CN 201320418322 U CN201320418322 U CN 201320418322U CN 203337448 U CN203337448 U CN 203337448U
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- pipeline
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Abstract
The utility model discloses a device for shortening back pressure saturation and consolidation time in a triaxial test. A soil sample of the triaxial test is installed in a confining pressure chamber, and the device is connected to a base of a triaxial instrument and comprises a three-way valve, a two-way valve, a pipeline I, a pipeline II and a pipeline III. One end of the pipeline I is connected to the base, the other end of the pipeline I is connected with one port of the two-way valve, the other port of the two-way valve is connected with one end of the pipeline II, the other end of the pipeline II is connected with an inlet of the three-way valve, the inlet of the three-way valve is connected with one end of the pipeline II, and an outlet of the three-way valve is connected with a back pressure controller. The designed device can shorten the back pressure saturation time and the consolidation time in the test process by over 12h.
Description
Technical field
The utility model relates to a kind of device that shortens the saturated and consolidation time of back-pressure in triaxial test, belongs to field of mechanical technique.
Background technology
At present in soil test saturation process commonly used be exactly head saturated, vacuumize saturated, carbon dioxide is saturated and back-pressure is saturated.Wherein the saturated a kind of supplementary means as saturated sample of back-pressure is particularly important in the saturated and silty clay saturation history of clay.The first step after the sample preparation of geotechnique's triaxial compression test is carried out saturated to sample exactly, for sandy soil, can adopt carbon dioxide saturated, effect is better, for pure clay can adopt vacuumize saturated, but for this loosely organized special silty clay of loess, in saturation history, be easy to sample is produced to disturbance, to dry density larger undisturbed can adopt vacuumize saturated, for dry density, less undisturbed can adopt carbon dioxide saturated, but for reinventing sample, vacuumize in the full water process of saturated meeting after bleeding and make the soil sample generation defeated and dispersed, the effect that carbon dioxide is saturated neither be fine, after saturated, saturation degree does not still reach more than 95%, must carry out back-pressure saturated to reach capacity.It is saturated that the GDS unsaturation triaxial apparatus that adopts Britain to produce in test carries out back-pressure to soil sample, but current back-pressure saturation history is exactly first to lead to carbon dioxide then to carry out back-pressure saturated, whole process need continues 1-2 days, the saturated approach of the back-pressure of using in test is exactly saturated according to directly to the top of soil sample, carrying out back-pressure after back-pressure controller setting precompressed, expends time in longer.
In addition; in geotechnique's triaxial compression test, consolidation process is also very slow, and the duration is long; the consolidation style that GDS unsaturation triaxial apparatus adopts is to enter to the back-pressure controller by the water in the controller Control Assay; the back-pressure pipeline of GDS unsaturation triaxial apparatus is at the sample top, so, in fixed process, if want, the water of loess sample bottom is discharged; need through whole sample; drainage path is very long, and more than consolidation time need to continue 20h, effectively consolidation pressure is 150kPa.When the dry density of loess is larger, expend time in longer.
Prior art, for carrying out drainage by the top of sample, is intake in the back-pressure saturation history, draining in consolidation process, and the path of draining and water inlet is longer, and the test period of cost is longer.Drainage pattern and water intake mode do not meet the saturated and consolidation process of the soil body under natural conditions.
The utility model content
The utility model provides a kind of device that shortens the saturated and consolidation time of back-pressure in triaxial test, in prior art, GDS unsaturation triaxial apparatus can only carry out by the sample top deficiency of draining and water inlet, solve instrument at saturated and single water inlet and drainage pattern fixed the time, shortened test period and simulated better the soil body saturated and consolidation process under field conditions (factors).
For solving above technical matters, the utility model provides following technical scheme: a kind of device that shortens the saturated and consolidation time of back-pressure in triaxial test, and it is indoor that the soil sample of triaxial test is installed on confined pressure, and T-valve is arranged on the outside of confined pressure chamber; Described device is connected in the base of triaxial apparatus, comprise T-valve, two-port valve, pipeline I, pipeline II and pipeline III, the end of pipeline I connects base, the other end of pipeline I connects a port of two-port valve, the end of the another port connecting line II of two-port valve, the other end of pipeline II connects the import of described T-valve, the end of another inlet connecting branch road III of T-valve, and the other end of pipeline III connects triaxial apparatus top pipeline; The outlet of T-valve connects the back-pressure controller.
The device of the saturated and consolidation time of back-pressure in this shortening triaxial test that the utility model relates to, can shorten test period, for diameter, be 50mm, it is highly the loess remoulded sample of 100mm, more than in process of the test, the back-pressure saturation time has shortened 12h, before repacking, being the 36h left and right, more than consolidation time has shortened 12h, is 24h before repacking.
The accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that the utility model shortens the saturated and consolidation time of back-pressure in triaxial test.
Embodiment
As shown in Figure 1, soil sample is positioned in confined pressure chamber 8, comprise T-valve 6, two-port valve 4, pipeline I3, pipeline II5 and pipeline III7, the pipeline of prior art connects the top 1 of triaxial apparatus, same pipeline is all passed through in water inlet and draining, now it is carried out to structure of modification, by triaxial apparatus base 2 connecting line I3, pipeline I3 connects two-port valve 4, two-port valve 4 connecting line II5, pipeline II5 connecting tee valve 6, much more like this to draw an intake-discharge pipe road, the pipeline at original connection top also collects and is communicated with T-valve 6, realize that many pipelines advance draining, improve test efficiency, shorten in triaxial test the saturated and consolidation time of back-pressure.
In this process of the test, select newly-designed T-valve 6 interfaces to carry out back-pressure to silty clay-loess remoulded sample saturated and fixed, provide confined pressure 240kPa in back-pressure in saturated process, back-pressure 220kPa is provided, the time that back-pressure is saturated is controlled as 10-12h.After the detection of B value is passed through, carry out in fixed, fixed process, adopt confined pressure 150kPa soil sample to carry out fixed, test period is set to 10h.In consolidation process, find, in the time of 8h, the water discharge in a hour has been less than the per mille of volume of sample, has reached the fixed standard completed.But, when 10h, effect is ideal, water discharge has reached 0.2 ‰ of volume of sample.
We connect inlet pipe, drain pipe by the base position at the GDS triaxial apparatus in the process of test, then outdoor of confined pressure, a three-way interface are set, by the back-pressure pipeline at sample top two of being connected to three-way interface parallel with the base inlet pipe, drain pipe.This has shortened saturated path in the back-pressure saturation history and the drainage path in the consolidation draining process in whole test, can greatly shorten test period.
Embodiment described in the utility model does not form the restriction to the application's scope; every within the spirit and principle of the utility model design, any modification that one of skill in the art can make, be equal to and replace and within improvement etc. all should be included in protection domain of the present utility model.
Claims (1)
1. a device that shortens the saturated and consolidation time of back-pressure in triaxial test, is characterized in that, it is indoor that the soil sample of triaxial test is positioned over confined pressure, and it is outdoor that T-valve is arranged on confined pressure; Described device is connected in the base of triaxial apparatus, comprise T-valve, two-port valve, pipeline I, pipeline II and pipeline III, the end of pipeline I connects base, the other end of pipeline I connects a port of two-port valve, the end of the another port connecting line II of two-port valve, the other end of pipeline II connects the import of described T-valve, the end of another inlet connecting branch road III of T-valve, and the other end of pipeline III connects triaxial apparatus top pipeline; The outlet of T-valve connects the back-pressure controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204183229U CN203337448U (en) | 2013-07-15 | 2013-07-15 | Device for shortening back pressure saturation and consolidation time in triaxial test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204183229U CN203337448U (en) | 2013-07-15 | 2013-07-15 | Device for shortening back pressure saturation and consolidation time in triaxial test |
Publications (1)
| Publication Number | Publication Date |
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| CN203337448U true CN203337448U (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013204183229U Expired - Lifetime CN203337448U (en) | 2013-07-15 | 2013-07-15 | Device for shortening back pressure saturation and consolidation time in triaxial test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940664A (en) * | 2014-05-13 | 2014-07-23 | 中国矿业大学 | Device and method for identifying hard soil fracture microstructure under triaxial test conditions |
| CN104155427A (en) * | 2014-08-08 | 2014-11-19 | 王平 | Low back pressure saturation method for loess liquidation experiment |
-
2013
- 2013-07-15 CN CN2013204183229U patent/CN203337448U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940664A (en) * | 2014-05-13 | 2014-07-23 | 中国矿业大学 | Device and method for identifying hard soil fracture microstructure under triaxial test conditions |
| CN104155427A (en) * | 2014-08-08 | 2014-11-19 | 王平 | Low back pressure saturation method for loess liquidation experiment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |