Laminated pressure chamber for preparing remolded soil

Abstract

The utility model relates to a laminated pressure chamber for preparing remolded soil, the laminated pressure chamber is used for pressing a soil sample with a preset thickness, the laminated pressure chamber comprises a foundation slab, a first water permeable plate, a laminated ring group, an outer frame body, a second water permeable plate and a pressurizing cover plate, and the first water permeable plate is arranged on the foundation slab; the stacked ring group is arranged on the first water permeable plate, is formed by stacking a plurality of stacked ring single bodies, and is provided with a containing cavity capable of containing a soil body sample; the outer frame body is detachably arranged on the foundation bottom plate and surrounds the outer side of the stacked ring set, at least part of the outer frame body is connected with the top edge of the stacked ring set in a clamped mode, the thickness direction of the stacked ring set is defined as the first direction, and the outer frame body can move by a preset distance in the first direction relative to the foundation bottom plate; and the second permeable plate and the pressurizing cover plate are sequentially arranged at the top of the stacked ring group. The laminated pressure chamber can prevent the laminated ring group from shifting and sliding, samples are directly manufactured in the laminated rings, secondary transfer is not needed, and the problem that the samples are difficult to prepare in a single shear test is solved.

Description

Technical Field

[0001] The present application relates to the technical field of geotechnical testing devices, and in particular to a laminated pressure chamber for preparing remolded soil. Background Art

[0002] Since the shear surface area of ​​the single shear apparatus is constant and the shear failure surface is not fixed, it is more suitable for studying the shear characteristics of soil and has attracted the attention of many scholars. However, due to the small size of the stacking ring and its easy sliding, it is very difficult to use a soil picker to cut the prepared reshaped sample and then place it into the stacking ring. Therefore, it is necessary to develop a sample preparation device suitable for single shear test reshaped samples that can avoid secondary transfer. Utility Model Content

[0003] The embodiment of the present application provides a laminated pressure chamber for preparing remolded soil, which can prevent the stacking ring group from deflecting and sliding. The sample is directly made in the stacking ring without secondary transfer, thus solving the problem of difficulty in preparing samples for single shear test.

[0004] The laminated pressure chamber for preparing remolded soil provided in the embodiment of the present application is used to press a soil sample with a preset thickness, and specifically comprises: a base bottom plate and a first permeable plate, wherein the first permeable plate is arranged on the base bottom plate;

[0005] A stacking ring group, the stacking ring group is arranged on the first water-permeable plate, the stacking ring group is formed by stacking a plurality of stacking ring monomers, and the stacking ring group has a containing cavity capable of containing the soil sample;

[0006] An outer frame, which is detachably arranged on the base bottom plate and encloses the outer side of the stacking ring group, and at least part of the outer frame is clamped with the top edge of the stacking ring group, and the thickness direction of the stacking ring group is defined as a first direction, and the outer frame can move a preset distance relative to the base bottom plate along the first direction;

[0007] A second water-permeable plate and a pressurized cover plate are sequentially arranged on the top of the stacked ring group.

[0008] In addition, the laminated pressure chamber provided in the embodiment of the present application may also have the following additional technical features:

[0009] In an optional scheme, the stacking ring group has a first thickness and a second thickness, and the first thickness is greater than the second thickness; at the first thickness, the outer frame is at least partially engaged with the top edge of the stacking ring group, and at the second thickness, the outer frame can move toward the base bottom plate side and at least partially engage with the top edge of the stacking ring group.

[0010] In an optional solution, there is a gap between the outer wall of the stacked ring group and the inner wall of the outer frame, the length of the gap is 0.05-0.1 mm, and the outer wall of the stacked ring group is sealed with at least one layer of sealing tape.

[0011] In an optional scheme, the outer frame includes a front and rear outer frame and an L-shaped socket that are detachably connected, the front and rear outer frames are arranged on both sides of the length direction of the stacking ring group, the L-shaped socket is arranged on both sides of the width direction of the stacking ring group, and the L-shaped socket is clamped to the top edge of the stacking ring group and can move along the first direction relative to the basic base plate.

[0012] In an optional solution, the front and rear outer frames and the L-shaped socket are respectively connected to the base bottom plate by screws, the top height of the front and rear outer frames is flush with the top height of the stacking ring group, and the groove bottom surface of the L-shaped socket is clamped to the top edge of the stacking ring group.

[0013] In an optional solution, if the height of the stacked ring group is defined as H1, and the required height of the soil sample after compression is defined as H2, then H1 and H2 satisfy: (H1-H2) / H2≥2 / 5.

[0014] In an optional solution, the stacked ring group is made of stainless steel and has a U-shape.

[0015] In an optional solution, filter paper is provided between the first water-permeable plate and the stacked ring group, and between the second water-permeable plate and the stacked ring group.

[0016] The beneficial effects of the embodiments of the present application are:

[0017] The laminated pressure chamber in the embodiment of the present application limits the stacking ring group through the outer frame. Since the outer frame can move relative to the base plate, it can better adapt to the stacking ring groups of different thicknesses and limit them. No slippage occurs during sample preparation, reducing disturbance to the soil sample. After the sample is pressed, the redundant stacking rings are removed according to the designed height of the test, which can also play a clamping role on the stacking rings, thereby effectively preventing the stacking ring group from offsetting and sliding. The single shear test can be used directly without the need for secondary transfer of the sample. The operation is simple, solving the problem of difficulty in sample preparation for the single shear test.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a laminated pressure chamber provided in the present application in a specific embodiment;

[0020] Figure 2A schematic diagram of the installation of the stacking ring assembly provided in the present application in a specific embodiment;

[0021] Figure 3 A schematic diagram of the installation of the second water-permeable plate and the pressure cover plate provided in this application;

[0022] Figure 4 This is a schematic structural diagram of an L-shaped card holder provided in the present application in a specific embodiment.

[0023] Figure numerals: base bottom plate 1, first water-permeable plate 2, stacking ring group 3, outer frame 4, front and rear outer frames 41, L-shaped seat 42, groove 43, second water-permeable plate 5, pressure cover plate 6.

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0025] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0030] As Figure 1-4 shown, an embodiment of the present application provides a laminated pressure chamber for preparing remolded soil, which is used to press a soil sample to a preset thickness. Specifically, it includes a base bottom plate 1, a first water-permeable plate 2, a laminated ring group 3, an outer frame body 4, a second water-permeable plate 5, and a pressure cover plate 6. Among them, the first water-permeable plate 2 is arranged on the base bottom plate 1; the laminated ring group 3 is arranged on the first water-permeable plate 2, and the laminated ring group 3 is stacked by a plurality of laminated ring monomers. The laminated ring group 3 has an accommodating cavity capable of accommodating a soil sample; the outer frame body 4 is detachably arranged on the base bottom plate 1 and encloses the outside of the laminated ring group 3, and at least part of the outer frame body 4 is clamped with the top edge of the laminated ring group 3. If the thickness direction of the laminated ring group 3 is defined as the first direction, the outer frame body 4 can move a preset distance relative to the base bottom plate 1 along the first direction; the second water-permeable plate 5 and the pressure cover plate 6 are sequentially arranged on the top of the laminated ring group 3.

[0031] Specifically, the planar size of the laminated ring group 3 needs to be consistent with the planar size of the sample used in the test. Therefore, the size of the laminated ring group 3 can be preset according to the test requirements; the material of the laminated ring group 3 is stainless steel, and the shape of the laminated ring group 3 is a square frame shape. In this embodiment, the laminated pressure chamber limits the laminated ring group 3 through the outer frame body 4. Since the outer frame body 4 can move relative to the base bottom plate 1, it can better adapt to laminated ring groups 3 of different thicknesses and play a limiting role, without slippage during sample preparation, reducing the disturbance to the soil sample; after the sample pressing is completed, the excess laminated rings can also be clamped after being removed according to the height designed in the test, thus well preventing the laminated ring group 3 from shifting and sliding. It can be directly used in the direct shear test, and the sample does not need to be transferred twice, with simple operation, solving the problem of difficult sample preparation in the direct shear test.

[0032] In a specific embodiment, the laminated ring group 3 has a first thickness and a second thickness, and the first thickness is greater than the second thickness; at the first thickness, at least part of the outer frame body 4 is clamped to the top edge of the laminated ring group 3, and at the second thickness, the outer frame body 4 can move towards the base bottom plate 1 side and at least part of it is clamped to the top edge of the laminated ring group 3.

[0033] As Figure 1 shown, in a specific embodiment, there is a gap between the outer wall of the laminated ring group 3 and the inner wall of the outer frame body 4, and the length of the gap is 0.05 - 0.1 mm. At least one layer of sealing tape is hermetically arranged on the outer wall of the laminated ring group 3. The gap of 0.05 - 0.1 mm can reserve space for the sealing tape, and the sealing tape can prevent mud leakage during sample preparation.

[0034] As Figure 1-4As shown, in a specific embodiment, the outer frame 4 includes a front and rear outer frame 41 and an L-shaped card seat 42 that are detachably connected, the front and rear outer frames 41 are arranged on both sides of the length direction of the stacking ring group 3, and the L-shaped card seat 42 is arranged on both sides of the width direction of the stacking ring group 3, and the L-shaped card seat 42 is clamped to the top edge of the stacking ring group 3 and can move relative to the basic bottom plate 1 along the first direction. In addition, the front and rear outer frames 41 and the L-shaped card seat 42 are respectively connected to the basic bottom plate 1 by screws, the top height of the front and rear outer frames 41 is flush with the top height of the stacking ring group 3, and the bottom surface of the groove 43 of the L-shaped card seat 42 is clamped to the top edge of the stacking ring group 3.

[0035] Specifically, when in use, the front and rear outer frames 41 are installed on the basic bottom plate 1, located on the front and rear sides of the stacking ring group 3, and the height is consistent with the top surface height of the stacking ring group 3. The L-shaped holder 42 is installed on the left and right sides of the stacking ring group 3, and the bottom surface height of the groove 43 is consistent with the height of the stacking ring group 3, which can just clamp the stacking ring group 3; the L-shaped holder 42 is connected to the basic bottom plate 1 by long screws, and the height can be adjusted to adapt to the height of the stacking ring group 3 in the subsequent sample cutting process.

[0036] In a specific embodiment, if the height of the stacking ring group 3 is defined as H1, and the required height of the soil sample after compression is H2, then H1 and H2 satisfy: (H1-H2) / H2≥2 / 5, that is, the height of the stacking ring group 3 must be higher than 40% of the sample height required for the test. This is because the height of the mud will decrease after being compressed and consolidated by static pressure, and it is necessary to ensure that the final height after compression can still meet the height requirement required for the test; Vaseline is applied on each layer of the stacking ring group 3 to play a lubricating role, thereby reducing the friction between the soil and the side wall inside the stacking ring group 3 when the soil is compressed.

[0037] like Figure 1-4 As shown, in a specific embodiment, when the laminated pressure chamber is in use, filter paper is arranged between the first water-permeable plate 2 and the stacking ring group 3, and between the second water-permeable plate 5 and the stacking ring group 3. Specifically, the steps for using the laminated pressure chamber are as follows: first, place the first water-permeable plate 2 on the base bottom plate 1, and place a layer of filter paper of suitable size on it; then stack the stacking ring group 3 in the height direction and seal it with a sealing tape on the filter paper; install the front and rear side frames and the L-shaped holder 42; then evenly place the mud with a certain water content in the assembled sample preparation device, with the height consistent with the height of the top surface of the stacking ring group 3, and smooth it; then place the filter paper, the second water-permeable plate 5 and the pressure cover plate 6 on the sample; and press the sample according to the designed load.

[0038] After the sample preparation is completed, remove the front and rear outer frames 41, the L-shaped holder 42 and the sealing tape, and remove the excess stacking rings according to the sample height designed for the test; install the L-shaped holder 42 again, and adjust the bottom height of the groove 43 of the L-shaped holder 42 to be consistent with the top height of the stacking ring group 3, just clamping the stacking ring; finally, arrange the soil cutting knife along the width direction of the stacking ring, and slowly cut the sample to the specified test height.

[0039] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laminated pressure chamber for preparing remolded soil, used for pressing soil samples to a preset thickness, characterized in that: include: A base bottom plate and a first water-permeable plate, wherein the first water-permeable plate is arranged on the base bottom plate; A stacking ring group, which is arranged on the first water-permeable plate, the stacking ring group is formed by stacking a plurality of stacking ring monomers, and the stacking ring group has a receiving cavity capable of receiving the soil sample; An outer frame, which is detachably arranged on the base bottom plate and encloses the outer side of the stacking ring group, and at least part of the outer frame is clamped with the top edge of the stacking ring group, and the thickness direction of the stacking ring group is defined as a first direction, and the outer frame can move a preset distance relative to the base bottom plate along the first direction; A second water-permeable plate and a pressurized cover plate are sequentially arranged on the top of the stacked ring group.

2. The laminated pressure chamber for preparing remolded soil according to claim 1, characterized in that: The stacking ring group has a first thickness and a second thickness, and the first thickness is greater than the second thickness; at the first thickness, the outer frame is at least partially engaged with the top edge of the stacking ring group, and at the second thickness, the outer frame can move toward the base bottom plate side and at least partially engage with the top edge of the stacking ring group.

3. The laminated pressure chamber for preparing remolded soil according to claim 1 or 2, characterized in that: There is a gap between the outer wall of the stacked ring group and the inner wall of the outer frame, the length of the gap is 0.05-0.1 mm, and the outer wall of the stacked ring group is sealed with at least one layer of sealing tape.

4. The laminated pressure chamber for preparing remolded soil according to claim 3, characterized in that: The outer frame includes a front and rear outer frame and an L-shaped socket that are detachably connected, the front and rear outer frames are arranged on both sides of the length direction of the stacking ring group, the L-shaped socket is arranged on both sides of the width direction of the stacking ring group, and the L-shaped socket is clamped on the top edge of the stacking ring group and can move along the first direction relative to the basic bottom plate.

5. The laminated pressure chamber for preparing remolded soil according to claim 4, characterized in that: The front and rear outer frames and the L-shaped card seat are respectively connected to the basic bottom plate by screws, the top height of the front and rear outer frames is flush with the top height of the stacking ring group, and the groove bottom surface of the L-shaped card seat is clamped to the top edge of the stacking ring group.

6. The laminated pressure chamber for preparing remolded soil according to any one of claims 1-2 or 4-5, characterized in that: The height of the stacked ring group is defined as H1, and the required height of the soil sample after compression is defined as H2, then H1 and H2 satisfy: (H1-H2) / H2≥2 / 5.

7. The laminated pressure chamber for preparing remolded soil according to claim 6, characterized in that: The stacking ring group is made of stainless steel and has a U-shaped shape.

8. The laminated pressure chamber for preparing remolded soil according to claim 6, characterized in that: Filter paper is arranged between the first water-permeable plate and the stacked ring group, and between the second water-permeable plate and the stacked ring group.

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