CN103900872A - Vacuum preload preparing device and method of remolding soft clay hollow cylinder sample - Google Patents
Vacuum preload preparing device and method of remolding soft clay hollow cylinder sample Download PDFInfo
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- CN103900872A CN103900872A CN201410099598.4A CN201410099598A CN103900872A CN 103900872 A CN103900872 A CN 103900872A CN 201410099598 A CN201410099598 A CN 201410099598A CN 103900872 A CN103900872 A CN 103900872A
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Abstract
The invention discloses a vacuum preload preparing device and method of a remolding soft clay hollow cylinder sample. The preparing device comprises three main parts, namely a sample loading solidification cylinder, a drainage base and a three-way drainage body, and multiple supporting parts which include a tripod, geotextile, a latex film, a supporting top cover, a rubber sealing washer, a pneumatic valve and bolts; wherein a gas vent is formed in the middle of the sample loading solidification cylinder; the drainage base is made of a solid flange disc and grooves used for arranging the rubber sealing washer and the three-way drainage body are formed in the drainage base. By arranging the three-way drainage body which has the permeation, drainage and inner wall molding functions, the purpose that the remolding soft clay hollow cylinder sample with an international common inner diameter is directly prepared once is realized. According to the invention, the sample preparing time is shortened, and meanwhile, the secondary cutting, disturbance and waste of the sample are avoided, the preparing process of the remolding soft clay hollow cylinder sample is simplified, and further the efficiency of main stress shaft rotating related test and research is effectively improved.
Description
Technical field
The present invention relates to the sample preparing technical field in Geotechnical Engineering, especially relate to a kind of vacuum preloading preparation facilities and method of reinventing soft clay hollow cylinder sample.
Background technology
In Geotechnical Engineering field, in order to obtain the mechanical response characteristic of the soil body under the complicated dynamic conditions such as earthquake, traffic and wave load, usually need to carry out the experimental study of hollow cylinder sample under principal axes of stress rotate path.Undisturbed soil sample has in-situ stress state and prototype structure, can truly reflect the various mechanical properties of the soil body under natural condition, often becomes and carries out the optimal selection of shop experiment.But undisturbed sample apparatus and operating process complexity, transportation and preserve in exist stress relief and water loss problem, cost cost more high, many employing remoulded sample research experiment in practical operation.
At present mainly contain Chinese patent ZL200920106559.7 about reinventing the patent of soft clay sample preparation, ZL201020558288.1 and ZL 201310251375.0, but the above two sample preparation volumes are larger, need carry out cutting whole into sections, this three all cannot directly make the soft clay hollow cylinder sample of reinventing of standard, identical with original soft clay hollow cylinder sample, being still the solid soil block that test will be made is placed on the device that cuts into specially hollow cylinder sample and is prepared, such as the preparation method and the relevant apparatus that adopt Chinese patent ZL 200710070117.7 with ZL 200710070119.6 disclosed hollow cylinder samples, but rectangular parallelepiped soil block is finally cut into the hollow cylinder sample that can carry out experimental study still to be needed to spend the more time, and get the complicated effort of core operating process, inevitably cause the secondary of reinventing sample to cut, disturbance and waste.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of vacuum preloading preparation facilities and method of reinventing soft clay hollow cylinder sample, by to the transformation of the fixed preparation remoulded sample of vacuum device in the past, disposable direct making meets the soft clay hollow cylinder sample of reinventing of international conventional internal diameter (60mm or 120mm), avoided the secondary of sample to cut, disturbance and waste, simplify the operating process of reinventing soft clay hollow cylinder sample, and then effectively improved the efficiency of principal axes of stress rotation correlation test.
For achieving the above object, technical scheme of the present invention is:
A kind of vacuum preloading preparation facilities of reinventing soft clay hollow cylinder sample, comprise the fixed cylinder of dress sample, water-drainage base seat and three critical pieces of three lobe displacement hulls, and the kit such as three-legged support, geotextile, latex film, supporting top cover, rubber gasket, operated pneumatic valve, bolt.The fixed cylinder of dress sample middle part is provided with air hole, apart from bottom, 2cm place is provided with ring flange, the three lobe displacement hull whole body are provided with the evenly distributed permeable circular hole of blossom type, when test, its top is placed with supporting top cover, one deck filter paper is posted in outside, water-drainage base seat is made up of solid ring flange, which is provided with the groove of settling O-ring seal and three lobe displacement hulls, and the fixed cylinder of dress sample is bolted by ring flange with water-drainage base seat.
Three described lobe displacement hulls are split to form by plexi-glass tubular equalization, and external diameter is consistent with the internal diameter of hollow cylinder sample.
Described supporting top cover is provided with the evenly distributed permeable circular hole of blossom type, has the slot that 1cm is dark on it, and the spacing of outer shroud and interior ring equals the thickness of three lobe displacement hulls, can make three lobe displacement hulls firmly be fixed in supporting top cover, and the changing of the relative positions does not occur.
The thick 3cm of described water-drainage base seat, settle the dark 2cm of groove of three lobe displacement hulls, groove inside/outside diameter size and three lobe displacement hulls are consistent, groove is with an annulus for projection outward, the high 1cm of annulus, internal diameter is identical with three lobe displacement hull external diameters, therefore can guarantee that three lobe displacement hulls are at the trial in vertical state.
Reinvent a vacuum preloading preparation method for soft clay hollow cylinder sample, its major technique step is as follows:
(1) folk song of scene being obtained is dry, pulverizes, and sieves, and the preparation design water percentage mud that adds water, soaks 24 hours.
(2) water-drainage base seat is placed on three-legged support, after the outside painting of three lobe displacement hulls one deck vaseline, is inserted in the slot of water-drainage base seat, more supporting top cover is inserted in to three lobe displacement hull upper ends.
(3) wrap up in the wetting filter paper of one deck in the three lobe displacement hull peripheries that fix and top, and descend two ends bungee to entangle firm thereon, prevent that mud from entering displacement hull inside from hole.
(4) latex film upper and lower side turns up respectively, and to be enclosed within the fixed cylinder of dress sample upper for 1-2cm, in water-drainage base seat top pad last layer geotextile, finally will fill fixed of sample by bolt and water-drainage base seat is fixed by ring flange.
(5) air between latex film and the fixed cylinder of dress sample is taken out to the greatest extent by the air hole on the fixed cylinder of dress sample with vacuum pump, made latex film be close to the fixed cylinder of dress sample inwall, afterwards air hole is tightened.
(6) mud for preparing before water percentage is poured into uniformly in the fixed cylinder of dress sample, bevelling concussion in limit is stirred, and leaves standstill after 4 hours, by the latex film tying sealing of upper end.
(7) switch on power, start vacuum preloading and prepare sample.Measure water discharge and estimate the water percentage of soil sample below according to the moisture separation device connecting, in the time reaching pre-provisioning request, stop experiment.
(8) in sampling time,, cut the three lobe displacement hull top soil bodys, takes off after supporting top cover, three lobe displacement hulls extracted out one by one with pliers, then after soil sample external diameter is met the demands, just made standard manipulated soil hollow cylinder sample.
According to above technical scheme, the attainable beneficial effect of the present invention is:
By on the basis of the fixed preparation remoulded sample of vacuum device in the past, setting has three lobe displacement hulls of infiltration draining and inwall moulding double action, realize the object of reinventing soft clay hollow cylinder sample that disposable direct making has international conventional internal diameter, in shortening the sample preparation cycle, also avoided the secondary of sample to cut, disturbance and waste, simplify the operating process of reinventing soft clay hollow cylinder sample, and then effectively improved the work efficiency of principal axes of stress rotation correlation test.
Accompanying drawing explanation
Fig. 1 is the one-piece construction sectional view that the present invention reinvents the vacuum preloading preparation facilities of soft clay hollow cylinder sample.
Fig. 2 is water-drainage base seat vertical view of the present invention.
Fig. 3 is supporting top cover upward view of the present invention.
In figure: 1, latex film; 2, the fixed cylinder of dress sample; 3, filter paper; 4, three lobe displacement hulls; 5, rubber gasket; 6, water-drainage base seat; 7, three-legged support; 8, groove; 9, osculum; 10, slot circle; 11, supporting top cover; 12, air hole; 13, geotextile; 14, bolt; 15, ring flange; 16, operated pneumatic valve; 17, interior ring; 18, permeable circular hole; 19, outer shroud.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figures 1 and 2, the vacuum preloading preparation facilities of reinventing soft clay hollow cylinder sample of the present invention, comprise the fixed cylinder of dress sample 2, water-drainage base seat 6 and 4 three critical pieces of three lobe displacement hulls, and the kit such as three-legged support 7, geotextile 13, latex film 1, supporting top cover 11, rubber gasket 5, operated pneumatic valve 16, bolt 14.The fixed cylinder of dress sample 2 middle parts are provided with air hole 12, apart from bottom, 2cm place is provided with ring flange 15, three lobe displacement hulls 4 are split to form by plexi-glass tubular equalization, external diameter is consistent with the internal diameter of hollow cylinder sample, its whole body is provided with the evenly distributed permeable circular hole of blossom type, when test, its top is placed with supporting top cover 11, one deck filter paper 3 is posted in outside, supporting top cover 11 is provided with the evenly distributed permeable circular hole 18 of blossom type, on it, there is the slot that 1cm is dark, can make displacement hull firmly be fixed in supporting top cover 11, there is not the changing of the relative positions, the water-drainage base seat 6 of thick 3cm is made up of solid ring flange, on it, be respectively equipped with the groove conforming to three lobe displacement hull 4 sizes with rubber gasket 5, settle the dark 2cm of groove of three lobe displacement hulls 4, the high 1cm of annulus of groove outer lug, to guarantee that three lobe displacement hulls 4 are at the trial in vertical state, the fixed cylinder 2 of dress sample is fixed by bolt 14 by ring flange 15 with water-drainage base seat 6.
Reinvent the vacuum preloading preparation method of soft clay hollow cylinder sample, its major technique step is as follows:
(1) folk song of scene being obtained is dry, pulverizes, and sieves, and the preparation design water percentage mud that adds water, soaks 24 hours.
(2) water-drainage base seat 6 is placed on three-legged support 7, after the outside painting one deck of three lobe displacement hulls 4 vaseline, is inserted in the slot of water-drainage base seat 6, more supporting top cover 11 is inserted in to three lobe displacement hull 4 upper ends.
(3) wrap up in the wetting filter paper of one deck 3 at three lobe displacement hull 4 peripheries and the top that fix, and descend two ends bungee to entangle firm thereon, prevent that mud from entering displacement hull inside from hole.
(4) the latex film 1 upper and lower side 1-2cm that turns up is respectively enclosed within on the fixed cylinder of dress sample 2, in water-drainage base seat 6 top pad last layer geotextile 13, finally will fill the fixed cylinder 2 of sample and water-drainage base seat 6 by bolt 14 and pass through ring flange 15 and fix.
(5) air between latex film 1 and the fixed cylinder 2 of dress sample is taken out to the greatest extent by the air hole 12 on the fixed cylinder 2 of dress sample with vacuum pump, made latex film 1 be close to the fixed cylinder of dress sample 2 inwalls, afterwards air hole 12 is tightened.
(6) mud for preparing before water percentage is poured into uniformly in the fixed cylinder 2 of dress sample, bevelling concussion in limit is stirred, and leaves standstill after 4 hours, by the 1 tying sealing of the latex film of upper end.
(7) switch on power, start vacuum preloading and prepare sample.Measure water discharge and estimate the water percentage of soil sample below according to the moisture separation device connecting, in the time reaching pre-provisioning request, stop experiment.
(8) in sampling time,, cut the three lobe displacement hull 4 top soil bodys, takes off after supporting top cover 11, three lobe displacement hulls 4 extracted out one by one with pliers, then after soil sample external diameter is met the demands, just made standard manipulated soil hollow cylinder sample.
Claims (3)
1. reinvent the vacuum preloading preparation facilities of soft clay hollow cylinder sample for one kind, comprise the fixed cylinder of dress sample, water-drainage base seat, three lobe displacement hull and three-legged supports, geotextile, latex film, supporting top cover, rubber gasket, operated pneumatic valve etc., it is characterized in that filling the fixed cylinder of sample middle part and be provided with air hole, apart from bottom, 2cm place is provided with ring flange, the three lobe displacement hull whole body are provided with the evenly distributed permeable circular hole of blossom type, when test, its top is placed with supporting top cover, one deck filter paper is posted in outside, water-drainage base seat is made up of solid ring flange, which is provided with the groove of settling rubber gasket and three lobe displacement hulls, the fixed cylinder of dress sample is bolted by ring flange with water-drainage base seat,
Three described lobe displacement hulls are split to form by plexi-glass tubular equalization, and external diameter is consistent with the internal diameter of hollow cylinder sample;
Described supporting top cover is provided with the evenly distributed permeable circular hole of blossom type, has the slot that 1cm is dark on it, and the spacing of outer shroud and interior ring equals the thickness of three lobe displacement hulls.
2. a kind of vacuum preloading preparation facilities of reinventing soft clay hollow cylinder sample according to claim 1, it is characterized in that the thick 3cm of water-drainage base seat, settle the dark 2cm of groove of three lobe displacement hulls, groove inside/outside diameter size and three lobe displacement hulls are consistent, groove is with an annulus for projection outward, the high 1cm of annulus, internal diameter is identical with three lobe displacement hull external diameters.
3. a kind of vacuum preloading preparation method who reinvents soft clay hollow cylinder sample according to claim 1, its major technique step is as follows:
1) folk song of scene being obtained is dry, pulverizes, and sieves, and the preparation design water percentage mud that adds water, soaks 24 hours;
2) water-drainage base seat is placed on three-legged support, after the outside painting of three lobe displacement hulls one deck vaseline, is inserted in the slot of water-drainage base seat, more supporting top cover is inserted in to three lobe displacement hull upper ends;
3) wrap up in the wetting filter paper of one deck in the three lobe displacement hull peripheries that fix and top, and descend two ends bungee to entangle firm thereon, prevent that mud from entering displacement hull inside from hole;
4) latex film upper and lower side turns up respectively, and to be enclosed within the fixed cylinder of dress sample upper for 1-2cm, in water-drainage base seat top pad last layer geotextile, finally will fill fixed of sample by bolt and water-drainage base seat is fixed by ring flange;
5) air between latex film and fixed cylinder is taken out to the greatest extent by the air hole on the fixed cylinder of dress sample with vacuum pump, made latex film be close to the fixed cylinder of dress sample inwall, afterwards air hole is tightened;
6) mud for preparing before water percentage is poured into uniformly in the fixed cylinder of dress sample, bevelling concussion in limit is stirred, and leaves standstill after 4 hours, by the latex film tying sealing of upper end;
7) switch on power, start vacuum preloading and prepare sample;
Measure water discharge and estimate the water percentage of soil sample below according to the moisture separation device connecting, in the time reaching pre-provisioning request, stop experiment;
8) in sampling time,, cut the three lobe displacement hull top soil bodys, takes off after supporting top cover, three lobe displacement hulls extracted out one by one with pliers, then after soil sample external diameter is met the demands, just made the manipulated soil hollow cylinder sample of expection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099598.4A CN103900872B (en) | 2014-03-18 | Reinvent vacuum preloading preparation facilities and the method for soft clay hollow cylinder sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099598.4A CN103900872B (en) | 2014-03-18 | Reinvent vacuum preloading preparation facilities and the method for soft clay hollow cylinder sample |
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| Publication Number | Publication Date |
|---|---|
| CN103900872A true CN103900872A (en) | 2014-07-02 |
| CN103900872B CN103900872B (en) | 2016-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316378A (en) * | 2014-10-29 | 2015-01-28 | 温州大学 | Testing apparatus for preparing large-diameter remolded soft clay sample |
| CN104697828A (en) * | 2014-12-09 | 2015-06-10 | 温州大学 | Device for preparing hollow cylindrical sandy soil samples with different compactness degrees |
| CN105784444A (en) * | 2016-03-21 | 2016-07-20 | 浙江大学 | Indoor apparatus and method for producing hollow cylindrical remolded clay specimen by compressing |
| CN106596179A (en) * | 2017-02-08 | 2017-04-26 | 水利部交通运输部国家能源局南京水利科学研究院 | Slipping film and linear cutting type soft soil geotome and operating method thereof |
| CN106990000A (en) * | 2017-03-27 | 2017-07-28 | 温州大学 | Hollow cylinder sample interference guard dynamic pressure lid erecting device |
| CN108051264A (en) * | 2017-11-30 | 2018-05-18 | 温州大学 | Owe consolidation remolding soft clay sample preparation device |
| CN108106896A (en) * | 2017-12-20 | 2018-06-01 | 宁波诺丁汉大学 | It is a kind of to operate easy sand hollow cylinder sample sample preparation device and its method for making sample |
| CN108176103A (en) * | 2017-12-18 | 2018-06-19 | 长安大学 | A kind of filter-pressing device and the soil moisture extraction element and extracting method based on it |
| CN110006712A (en) * | 2019-01-21 | 2019-07-12 | 温州大学 | High-moisture percentage soft clay high confining pressure sample preparation and creep test system and its experimental working technique |
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| CN104697828A (en) * | 2014-12-09 | 2015-06-10 | 温州大学 | Device for preparing hollow cylindrical sandy soil samples with different compactness degrees |
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| CN108106896B (en) * | 2017-12-20 | 2020-08-11 | 宁波诺丁汉大学 | Sand hollow cylinder sample preparation device easy to operate and sample preparation method thereof |
| CN110006712A (en) * | 2019-01-21 | 2019-07-12 | 温州大学 | High-moisture percentage soft clay high confining pressure sample preparation and creep test system and its experimental working technique |
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