CN218297798U - A auxiliary device for improving saturated efficiency of sand among triaxial test - Google Patents
A auxiliary device for improving saturated efficiency of sand among triaxial test Download PDFInfo
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- CN218297798U CN218297798U CN202222391523.6U CN202222391523U CN218297798U CN 218297798 U CN218297798 U CN 218297798U CN 202222391523 U CN202222391523 U CN 202222391523U CN 218297798 U CN218297798 U CN 218297798U
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Abstract
The utility model discloses an auxiliary device for improving sand saturation efficiency among triaxial test, including gas receiver, pressure-bearing cylinder and backpressure room, the top of gas receiver is equipped with the top valve with external intercommunication, the bottom through first pipe with the backpressure room intercommunication, the lateral part pass through the second pipe with the bottom intercommunication of pressure-bearing cylinder, be equipped with the bottom valve on the first pipe, be equipped with the lateral part valve on the second pipe, the pressure-bearing cylinder is loaded with the sand sample, the backpressure room passes through first pipe to pour into or take liquid out in the gas receiver with control the gas receiver internal gas pressure size. The auxiliary device applies negative pressure to the sandy soil sample by using the back pressure chamber, and controls the opening and closing of the three valves to pump out partial bubbles in the pores of the sample, so that the initial saturation of the sample is effectively improved, and the time of a back pressure saturation step in a subsequent test is greatly saved.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering, especially, relate to an auxiliary device for improving sandy soil saturation efficiency among the triaxial test.
Background
In geotechnical engineering experiments, the mechanical properties of soil are an important research task, and a triaxial tester is the most commonly used geotechnical testing instrument. When the sandy soil triaxial test is carried out, back pressure is often required to be applied to a sample, and air in a pore space is compressed to achieve a saturation effect. However, for sandy soil samples, the initial bubbles in the samples are more, the progress of the back pressure saturation stage is slow, and the samples can be completed within 5-6 hours generally, so that the test time is greatly prolonged, and the required back pressure is too large due to excessive initial bubbles, which has higher requirements on the test device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an auxiliary device for improving among the triaxial test sand saturation efficiency, this auxiliary device utilizes the backpressure room to apply for sand sample negative pressure to control opening and shutting of three valve in order to take out the partial bubble in the sample hole, improve the initial saturation of sample effectively, saved the time of backpressure saturation step in the follow-up test greatly.
For this, the utility model provides an auxiliary device for improving sand saturation efficiency among triaxial test, including gas receiver, pressure-bearing cylinder and backpressure room, the top of gas receiver be equipped with the top valve of external intercommunication, the bottom through first pipe with the backpressure room intercommunication, the lateral part pass through the second pipe with the bottom intercommunication of pressure-bearing cylinder, be equipped with the bottom valve on the first pipe, be equipped with the lateral part valve on the second pipe, the pressure-bearing cylinder is loaded with the sand sample, the backpressure room passes through first pipe to pour into or take liquid out in the gas receiver and control the gas receiver internal gas pressure size.
Specifically, the counter-pressure chamber comprises an injection cavity and a piston which is slidably mounted in the injection cavity, and an injection port of the injection cavity is in butt joint with the first guide pipe.
Specifically, the air cylinder is a transparent cylinder body.
Specifically, the pressure-bearing cylinder is composed of a base, a rubber film and a gland, and two ends of the rubber film are respectively bound and fixed on the base and the gland.
Compared with the prior art, the utility model discloses at least one embodiment has following beneficial effect:
the utility model discloses a to original geotechnique test instrument improve, applyed an air receiver between back pressure chamber and pressure-bearing section of thick bamboo, utilize the physical principle that gas escaped more easily than liquid in the airtight space (molecular gravitation between gas is littleer), through controlling the back pressure chamber to apply less negative pressure repeatedly to the sample, take out the sample hole cavity air and arrange the external world, increased the initial saturation of sample effectively.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.
Fig. 1 is a schematic structural diagram of an auxiliary device provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a back pressure chamber according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a pressure-bearing cylinder according to an embodiment of the present invention;
wherein: 1. an air cylinder; 2. a pressure-bearing cylinder; 201. a base; 202. a rubber film; 203. a gland; 204. a porous stone; 3. a back pressure chamber; 301. an injection cavity; 302. a piston; 303. an injection port; 4. a top valve; 5. a first conduit; 6. a second conduit; 7. a bottom valve; 8. a side valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, an auxiliary device for improving sand saturation efficiency in triaxial test, including gas receiver 1, pressure-bearing cylinder 2 and backpressure chamber 3, the top of gas receiver 1 is equipped with top valve 4 with external intercommunication, the bottom is through first pipe 5 and backpressure chamber 3 intercommunication, the lateral part passes through second pipe 6 and pressure-bearing cylinder 2's bottom intercommunication, be equipped with bottom valve 7 on the first pipe 5, be equipped with lateral part valve 8 on the second pipe 6, the interior sand sample that loads of pressure-bearing cylinder 2, backpressure chamber 3 pours into or takes out liquid in order to control airtight gas receiver 1 internal gas pressure size through first pipe 5 to gas receiver 1, and then realize discharging the gas in the gas receiver 1 or take out the air in the sample hole to gas receiver 1 in.
The procedure for back pressure saturation of the sample using the above-described auxiliary device is as follows:
(1) Connecting three valves of the air cylinder 1 with corresponding guide pipes respectively;
(2) Closing the top valve, opening the bottom valve 7 and the side valve 8;
(3) The counter-pressure chamber 3 pumps liquid into the air storage cylinder 1 through the first conduit 5, the air pressure in the air storage cylinder 1 is adjusted to-10 kPa, namely negative pressure of-10 kPa is applied to the sample in the pressure bearing cylinder 2, and partial bubbles in sandy soil in the sample are sucked out;
(4) Standing for 2 minutes, sucking part of bubbles in the sample into the air storage cylinder 1, closing the side valve 8, opening the top valve and the bottom valve 7, and injecting liquid into the air storage cylinder 1 through the counter-pressure chamber 3 through the first conduit 5, so that air in the air storage cylinder is discharged through the top valve;
(5) After the bubbles in the air storage cylinder 1 are completely discharged, the back pressure chamber 3 discharges most of liquid in the air storage cylinder 1, the top valve is closed, and the side valve 8 is opened;
(6) Repeating the steps 2-5 for about 4 times, wherein when the reverse pressure chamber 3 applies pressure of-10 kPa to the air cylinder 1, the air bubbles sucked out from the sandy soil sample are limited, and then carrying out subsequent test steps.
In this embodiment, the first conduit and the counter-pressure chamber are themselves water, negative pressure is applied to the sample by withdrawing water from the first conduit through the counter-pressure chamber, thereby withdrawing air from the sample pores, and positive pressure is applied to the sample by injecting water from the counter-pressure chamber into the first conduit.
The utility model discloses a to original geotechnique test instrument improve, applyed an air receiver between back pressure chamber and pressure-bearing section of thick bamboo, utilize the physical principle that gas escaped more easily than liquid in the airtight space (molecular gravitation between gas is littleer), through controlling the back pressure chamber to apply less negative pressure repeatedly to the sample, take out the sample hole cavity air and arrange the external world, increased the initial saturation of sample effectively.
Referring to fig. 2, in practical design, the counter-pressure chamber 3 comprises an injection cavity 301 and a piston 302 slidably mounted in the injection cavity 301, an injection port 303 of the injection cavity 301 is in abutment with the first conduit 5, and a piston 302 rod at the rear end of the piston 302 is connected to the drive cylinder. The injection cavity 301 is filled with water, and the water can be conveniently injected into the air reservoir 1 or pumped out of the air reservoir 1 by the up-and-down movement of the piston 302.
It can be understood that, in specific application, the air reservoir 1, the first conduit 5, the second conduit 6 and the third conduit are all made of transparent materials, and the design can facilitate the real-time observation of the flowing condition of water and bubbles.
Referring to fig. 3, it should be explained that the specific structure of the pressure-bearing cylinder 2 is an existing structure, specifically, the pressure-bearing cylinder 2 is composed of a base 201, a rubber membrane 202 and a gland 203, two ends of the rubber membrane 202 are respectively bound and fixed on the base 201 and the gland 203, a permeable stone 204 can be additionally arranged between the base 201 and a sandy soil sample, during a sandy soil triaxial test, the sandy soil sample is placed in the pressure-bearing cylinder 2, then the pressure-bearing cylinder 2 is placed in a confining chamber, an axial loading head of a geotechnical testing instrument presses down the gland 203 to apply an axial load to the triaxial sandy soil sample, and meanwhile, since the pressure-bearing cylinder 2 is composed of the base 201, the rubber membrane 202 and the gland 203, the confining pressure of the sandy soil sample can be flexibly adjusted by adjusting the water pressure in the confining chamber.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are many and cannot be exhaustive, the present invention discloses some numerical values to exemplify the technical solutions of the present invention, and the above-mentioned enumerated numerical values should not be construed as limiting the scope of the present invention.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated. The utility model provides an arbitrary part both can be formed by a plurality of solitary component parts equipment, also can be for the solitary part that the integrated into one piece technology made out.
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it necessary or exhaustive for all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (5)
1. The utility model provides an auxiliary device for improving saturated efficiency of sand among triaxial test which characterized in that: the device comprises an air storage cylinder (1), a pressure-bearing cylinder (2) and a back-pressure chamber (3), wherein a top end valve (4) communicated with the outside is arranged at the top of the air storage cylinder (1), the bottom of the air storage cylinder is communicated with the back-pressure chamber (3) through a first guide pipe (5), the side of the air storage cylinder is communicated with the bottom of the pressure-bearing cylinder (2) through a second guide pipe (6), a bottom valve (7) is arranged on the first guide pipe (5), a side valve (8) is arranged on the second guide pipe (6), a sand sample is loaded in the pressure-bearing cylinder (2), and the back-pressure chamber (3) is filled or pumped with liquid to control the pressure in the air storage cylinder (1) through the first guide pipe (5).
2. The assistance device according to claim 1, characterized in that: the counter-pressure chamber (3) comprises an injection cavity (301) and a piston (302) slidably mounted in the injection cavity (301), an injection port (303) of the injection cavity (301) being in abutment with the first conduit (5).
3. The assistance device according to claim 1 or 2, characterized in that: the air storage cylinder (1) is a transparent cylinder body.
4. Auxiliary device according to claim 1 or 2, characterized in that: the first conduit (5), the second conduit (6) and the third conduit are all transparent tubes.
5. The assistance device according to claim 1 or 2, characterized in that: the pressure-bearing cylinder (2) is composed of a base (201), a rubber membrane (202) and a gland (203), and two ends of the rubber membrane (202) are respectively bound and fixed on the base (201) and the gland (203).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222391523.6U CN218297798U (en) | 2022-09-05 | 2022-09-05 | A auxiliary device for improving saturated efficiency of sand among triaxial test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222391523.6U CN218297798U (en) | 2022-09-05 | 2022-09-05 | A auxiliary device for improving saturated efficiency of sand among triaxial test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218297798U true CN218297798U (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222391523.6U Active CN218297798U (en) | 2022-09-05 | 2022-09-05 | A auxiliary device for improving saturated efficiency of sand among triaxial test |
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| Country | Link |
|---|---|
| CN (1) | CN218297798U (en) |
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2022
- 2022-09-05 CN CN202222391523.6U patent/CN218297798U/en active Active
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