CN103344747B - Technical method for shortening saturation time of silty clay - Google Patents
Technical method for shortening saturation time of silty clay Download PDFInfo
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- CN103344747B CN103344747B CN201310276509.4A CN201310276509A CN103344747B CN 103344747 B CN103344747 B CN 103344747B CN 201310276509 A CN201310276509 A CN 201310276509A CN 103344747 B CN103344747 B CN 103344747B
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Abstract
The invention discloses a technical method for shortening the saturation time of silty clay. According to the method, an unsaturated soil tri-axial test from Global Data Solutions (GDS) is adopted. The technical method comprises the following steps: a, placing a sample in a sample placing chamber of the GDS unsaturated soil tri-axial test, filling carbon dioxide to the sample placing chamber from a water inlet pipe at the bottom end of the sample placing chamber for a certain duration, and discharging the carbon dioxide from a back pressure pipeline at the top end of the sample placing chamber; b, filling carbon dioxide to the sample placing chamber through the back pressure pipeline for a certain duration, and discharging the carbon dioxide from the water inlet pipe through the sample; c, filling a certain quantity of water to the sample placing chamber from the back pressure pipeline through a back pressure controller, and discharging the water from the water inlet pipe through the sample; d, filling a certain quantity of water to the sample placing chamber from the water inlet pipe through the back pressure controller, and discharging the water from a back pressure pipeline through the sample; e, implementing back pressure saturation to the sample. The technical method not only shortens time for a silty clay saturation experiment but also keeps air-free water away from air, thus enhancing the saturation effect.
Description
Technical field
The present invention relates to the method and technology field that soil sample is saturated, especially a kind of technical method shortening silty clay saturation time.
Background technology
At present conventional in soil test saturation process 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 saturated and silty clay saturation history at clay.The first step after geotechnique's triaxial compression test sample preparation is carried out saturated to sample exactly, carbon dioxide can be adopted saturated for sand, and effect is better, for pure clay can adopt vacuumize saturated.
But for this loosely organized special silty clay of loess, the whole saturation history duration is very long and saturation degree is not very desirable, the undisturbed larger to dry density can adopt vacuumize saturated, saturated and the saturation process that the is saturated combination of back-pressure of carbon dioxide can only be adopted to carry out saturated for the undisturbed that dry density is less, but for reinventing sample, vacuumize in the full water process of saturated meeting after bleeding and make 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%, back-pressure must be carried out saturated with the state of reaching capacity.It is saturated that the GDS unsaturated soil triaxial apparatus adopting Britain to produce in test carries out back-pressure to soil sample,
But current back-pressure saturation history is exactly first lead to carbon dioxide then to carry out back-pressure saturated, whole process need continues about 36h, the saturated approach of the back-pressure used in test is exactly saturated according to carrying out back-pressure directly to the top of soil sample after backpressure controllers setting precompressed, expends time in longer.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of technical method shortening silty clay saturation time, not only shorten the silty clay saturation experiments time used, and avoid in air free water and enter air and make saturation effect better.
In order to realize foregoing invention object, the invention provides following technical scheme:
Shorten a technical method for silty clay saturation time, this process employs GDS unsaturated soil triaxial apparatus, comprise the steps:
A. sample is placed in the sample holding chamber of described GDS unsaturated soil triaxial apparatus, from the carbon dioxide of water inlet pipe to described sample holding chamber logical a period of time being positioned at described sample holding chamber bottom, carbon dioxide is discharged from the back-pressure pipeline being positioned at described sample holding chamber top;
B. by the carbon dioxide of described back-pressure pipeline logical a period of time in described sample holding chamber, carbon dioxide is discharged from described water inlet pipe by described sample;
C. in described sample holding chamber, lead to certain water gaging from described back-pressure pipeline by backpressure controllers, water is discharged from described water inlet pipe by described sample;
D. in described sample holding chamber, lead to certain water gaging from described water inlet pipe by backpressure controllers, water is discharged from described back-pressure pipeline by described sample;
E. back-pressure carried out to sample saturated.
Further, described step a stops after carbon dioxide to described sample holding chamber inside is logical for 90 minutes.
Further, described step b stops after carbon dioxide to described sample holding chamber inside is logical for 30 minutes.
Further, before described step a, first described sample is applied to the confined pressure of 20kPa, and then the air pressure of 15kPa is set on liquid carbon dioxide gas cylinder, utilize liquid carbon dioxide gas cylinder to the logical carbon dioxide in described sample holding chamber inside.
Further, described step c and described steps d all stop after discharge 50 to 100 ml water.
Further, the confined pressure of described step c and described steps d is set to 30kPa, and back-pressure is set to 25kPa.
Further, described water is the air free water obtained by boiling distilled water.
Further, described step e confined pressure is set to 240kPa, and back-pressure is set to 220kPa, and saturation time is 8 hours.
A kind of technical method shortening silty clay saturation time of the present invention,, opposite pressure controller saturated by carbon dioxide is crossed water saturation and the saturated comprehensive saturation mode combined of back-pressure and is reinvented sample to silty clay and carry out saturated, experiment results proved saturation effect is better, and the test period of cost is shorter.Can ensure in saturation history, air free water is in closed state always, not easily allows air dissolve in water and is unfavorable for the saturated of soil sample simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of equipment schematic diagram shortening the technical method of silty clay saturation time of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, should not have any restriction to protection scope of the present invention.
A kind of technical method shortening silty clay saturation time as shown in Figure 1, this process employs GDS unsaturated soil triaxial apparatus, this GDS unsaturated soil triaxial apparatus comprises pressure chamber 6 and sample holding chamber 2, this sample holding chamber 2 is for being enclosed within the rubber membrane of sample outside, its bottom is placed in base 12, its top is provided with top cover 11, and combination between each several part is also placed in pressure chamber 6 after good seal.
First, sample is applied to the confined pressure of 20kPa, then the air pressure of 15kPa is set on liquid carbon dioxide gas cylinder.Be placed on by sample in the sample holding chamber 2 of GDS unsaturated soil triaxial apparatus, water inlet pipe 3 and back-pressure pipeline 4 are each passed through base 12 and are communicated with sample holding chamber 2 inside with top cover 11.In sample holding chamber 2, lead to the carbon dioxide of 90 minutes from water inlet pipe 3 with liquid carbon dioxide gas cylinder, carbon dioxide is discharged from back-pressure pipeline 4.In sample holding chamber 2, led to the carbon dioxide of 30 minutes again by back-pressure pipeline 4, carbon dioxide is discharged from water inlet pipe 3 by sample.
Then, sample applied and keep the confined pressure of 30kPa and the back-pressure of 25kPa.In sample holding chamber 2, lead to 50 to 100 milliliters by boiling the air free water that distillation obtains by backpressure controllers from back-pressure pipeline 4, air free water is discharged from water inlet pipe 3 by sample.In sample holding chamber 2, lead to 50 to 100 milliliters of air free waters from water inlet pipe 3 by backpressure controllers again, air free water is discharged from back-pressure pipeline 4 by sample.The process of whole logical air free water roughly needs 2 hours.
The overall process of logical carbon dioxide and logical air free water is closed all the time away from the valve 5 of back-pressure pipeline 4 and water inlet pipe 3.
Finally, carry out back-pressure to sample saturated, confined pressure is set to 250kPa, and back-pressure is set to 220kPa, and saturation time is 8 hours.
Be 50mm for diameter, highly for the loess of 100mm reinvents sample, saturation testing more than time shorten 24h of the present invention (originally about 36h), only need 12h just can allow the saturation degree arrival more than 96% of soil sample.
A kind of technical method shortening silty clay saturation time of the present invention,, opposite pressure controller saturated by carbon dioxide is crossed water saturation and the saturated comprehensive saturation mode combined of back-pressure and is reinvented sample to silty clay and carry out saturated, experiment results proved saturation effect is better, and the test period of cost is shorter.Can ensure in saturation history, air free water is in closed state always, not easily allows air dissolve in water and is unfavorable for the saturated of soil sample simultaneously.
Claims (8)
1. shorten a technical method for silty clay saturation time, this process employs GDS unsaturated soil triaxial apparatus, it is characterized in that, comprise the steps:
A. sample is placed in the sample holding chamber of described GDS unsaturated soil triaxial apparatus, from the carbon dioxide of water inlet pipe to described sample holding chamber logical a period of time being positioned at described sample holding chamber bottom, carbon dioxide is discharged from the back-pressure pipeline being positioned at described sample holding chamber top;
B. by the carbon dioxide of described back-pressure pipeline logical a period of time in described sample holding chamber, carbon dioxide is discharged from described water inlet pipe by described sample;
C. in described sample holding chamber, lead to certain water gaging from described back-pressure pipeline by backpressure controllers, water is discharged from described water inlet pipe by described sample;
D. in described sample holding chamber, lead to certain water gaging from described water inlet pipe by backpressure controllers, water is discharged from described back-pressure pipeline by described sample;
E. back-pressure carried out to sample saturated.
2. a kind of technical method shortening silty clay saturation time as claimed in claim 1, is characterized in that, described step a stops after carbon dioxide to described sample holding chamber inside is logical for 90 minutes.
3. a kind of technical method shortening silty clay saturation time as claimed in claim 1, is characterized in that, described step b stops after carbon dioxide to described sample holding chamber inside is logical for 30 minutes.
4. a kind of technical method shortening silty clay saturation time as described in as arbitrary in claims 1 to 3, it is characterized in that, before described step a, first described sample is applied to the confined pressure of 20kPa, and then the air pressure of 15kPa is set on liquid carbon dioxide gas cylinder, utilize liquid carbon dioxide gas cylinder to the logical carbon dioxide in described sample holding chamber inside.
5. a kind of technical method shortening silty clay saturation time as claimed in claim 1, it is characterized in that, described step c and described steps d all stop after discharge 50 to 100 ml water.
6. a kind of technical method shortening silty clay saturation time as claimed in claim 1, it is characterized in that, the confined pressure of described step c and described steps d is set to 30kPa, and back-pressure is set to 25kPa.
7. as claim 1,5 or 6 arbitrary as described in a kind of technical method shortening silty clay saturation time, it is characterized in that, described water is the air free water obtained by boiling distillation.
8. a kind of technical method shortening silty clay saturation time as claimed in claim 1, it is characterized in that, described step e confined pressure is set to 240kPa, and back-pressure is set to 220kPa, and saturation time is 8 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107219160B (en) * | 2017-05-26 | 2019-07-30 | 兰州大学 | A kind of intelligent geotechnique's infiltration shearing test system |
| CN107687977B (en) * | 2017-07-24 | 2020-03-31 | 中国科学院力学研究所 | Rock soil sample ammonia saturation experimental method |
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