Sample preparation device of triaxial shear apparatus

Abstract

The utility model relates to the technical field of geotechnical engineering, in particular to a triaxial shear apparatus sample preparation device, which comprises a sample pusher, a soil cutting head, a sample loading pipe, a permeable stone and a pipe cap, the sample pusher comprises a sample pushing plate and a sample pushing rod, the soil cutting head is screwed at the lower end part of the sample loading pipe, the upper end and the lower end of the sample loading pipe are pressed into the permeable stone, and the pipe cap is connected with the sample pushing plate. The pipe caps are sleeved outside the upper end surface and the lower end surface of the sample loading pipe; during sampling, the sample pushing plate of the sample pusher acts on the upper end face of the permeable stone at the upper end of the sample loading pipe or the lower end face of the permeable stone at the lower end of the sample loading pipe. According to the triaxial shear apparatus sample preparation device disclosed by the utility model, a sample can be easily and conveniently cut and pushed out through the sample loading pipe, the permeable stone, the soil cutting head and the sample pushing device, the triaxial shear apparatus sample preparation device has multiple functions of detachability, soil sample cutting, plugging and the like, the operation is convenient and simple, and human errors are not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering, in particular to a sample preparation device for a triaxial shear apparatus. Background Art

[0002] The triaxial shear apparatus is mainly used to measure the cohesion and internal friction angle of materials, and can indirectly measure the shear strength of materials. According to the different ways of applying axial pressure, the triaxial shear apparatus is divided into two types: strain-controlled type and stress-controlled type.

[0003] The requirements for samples by the triaxial shear apparatus include the following points:

[0004] 1. The sample should be representative and able to reflect the overall performance of the studied material.

[0005] 2. The non-uniformity of the specimen should meet the requirements of relevant regulations to ensure the accuracy of the test results.

[0006] 3. The size, shape, surface machining accuracy, etc. of the specimen should meet the specified requirements to ensure the stability of the sample during the test.

[0007] 4. Before conducting the triaxial shear test, it is necessary to saturate the specimen to eliminate the pore water pressure inside the specimen, so as to more accurately reflect the actual performance of the material.

[0008] Article 19.3.1 of the "Geotechnical Test Specification" GB / T50123-2019 stipulates that the samples for the triaxial shear test are cylinders with a diameter of 39.1mm, 61.8mm or 101.0mm and a height-diameter ratio of 2.0 - 2.5.

[0009] Since the specifications of the soil samples obtained by drilling are inconsistent with those of the samples for the triaxial shear test, experimental personnel often use tools such as soil cutting knives and soil sample turntables to prepare the samples for the triaxial shear test, which is time-consuming and laborious. Moreover, since the samples are all made by manual cutting, the specifications of the samples often do not meet the test requirements, and multiple reworks are required, or even the preparation fails, resulting in the loss of test data. For the samples that are successfully cut, they still need to be placed in a saturator for saturation before the test, and the whole process is cumbersome and prone to errors. Summary of the Utility Model

[0010] The technical problem to be solved by the utility model is: in order to overcome the deficiencies existing in the prior art, to provide a sample preparation device for a triaxial shear apparatus, which can quickly prepare and immerse the samples for the triaxial test to saturation.

[0011] The technical solution adopted by the utility model to solve its technical problems is: a sample preparation device for a triaxial shear apparatus, including a sample pusher, a soil cutting head, a sample loading tube, a permeable stone and a tube cap,

[0012] The sample pusher includes a sample pushing plate and a sample pushing rod,

[0013] The described soil cutting head is screwed to the lower end of the sample loading tube.

[0014] Permeable stones are pressed into both the upper and lower ends of the sample loading tube.

[0015] The described pipe caps are sleeved outside the upper and lower end faces of the sample loading tube.

[0016] During sampling, the pushing plate of the sample pusher acts on the upper end face of the permeable stone at the upper end of the sample loading tube or the lower end face of the permeable stone at the lower end of the sample loading tube.

[0017] Further, the pipe cap located above the sample loading tube protrudes from the side wall of the sample loading tube, and air suction holes are provided on the protruding side wall.

[0018] Further, the pipe cap located below the sample loading tube protrudes from the side wall of the sample loading tube, and water inlet holes are provided on the protruding side wall.

[0019] Further, the upper end face of the permeable stone at the upper end of the sample loading tube is flush with the upper end face of the sample loading tube, and the lower end face of the permeable stone at the lower end of the sample loading tube is flush with the lower end face of the sample loading tube.

[0020] Further, the inner diameters of both the soil cutting head and the sample loading tube are 39.1 mm, the diameter of the permeable stone is 39.1 mm, and the diameter of the pushing plate of the sample pusher is smaller than the inner diameter of the sample loading tube;

[0021] The outer diameter of the sample loading tube is 42 mm, and the inner diameter of the pipe cap is 42 mm.

[0022] Further, the height of the sample loading tube is 100 mm, and the height of the permeable stone is 10 mm.

[0023] The beneficial effects of the present utility model are as follows: The sample preparation device of the triaxial shear apparatus of the present utility model completes easy and convenient sample interception and pushing through the sample loading tube, permeable stones, soil cutting head and sample pusher, has multiple functions such as detachable, soil sample cutting, plugging, etc., is convenient and simple to operate, and is not prone to human errors. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the present utility model during sample cutting;

[0026] Figure 2It is a schematic structural view of the present utility model when immersed in water;

[0027] Figure 3 It is a schematic structural view of the present utility model during sampling.

[0028] Reference numerals in the figure: 1 - sample pusher, 11 - sample pushing plate, 12 - sample pushing rod, 2 - soil cutting head, 3 - sample loading tube, 4 - permeable stone, 5 - pipe cap, 51 - air suction hole, 52 - water inlet hole. Specific embodiments

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0030] Figures 1-3 A sample maker for a triaxial shear apparatus as shown includes a sample pusher 1, a soil cutting head 2, a sample loading tube 3, a permeable stone 4 and a pipe cap 5.

[0031] The sample pusher 1 includes a sample pushing plate 11 and a sample pushing rod 12.

[0032] The soil cutting head 2 is screwed to the lower end of the sample loading tube 3.

[0033] The upper and lower ends of the sample loading tube 3 are pressed into the permeable stone 4.

[0034] The pipe cap 5 is sleeved outside the upper and lower end faces of the sample loading tube 3.

[0035] During sampling, the sample pushing plate 11 of the sample pusher 1 acts on the upper end face of the permeable stone 4 at the upper end of the sample loading tube 3 or the lower end face of the permeable stone 4 at the lower end of the sample loading tube 3.

[0036] The pipe cap 5 located above the sample loading tube 3 has an air suction hole 51 provided on the side wall protruding from the sample loading tube 3.

[0037] The pipe cap 5 located below the sample loading tube 3 has a water inlet hole 52 provided on the side wall protruding from the sample loading tube 3.

[0038] The upper end face of the permeable stone 4 at the upper end of the sample loading tube 3 is flush with the upper end face of the sample loading tube 3, and the lower end face of the permeable stone 4 at the lower end of the sample loading tube 3 is flush with the lower end face of the sample loading tube 3.

[0039] The inner diameters of the soil cutting head 2 and the sample loading tube 3 are both 39.1 mm, the diameter of the permeable stone 4 is 39.1 mm, and the diameter of the sample pushing plate 11 of the sample pusher 1 is smaller than the inner diameter of the sample loading tube 3;

[0040] The outer diameter of the sample loading tube 3 is 42 mm, and the inner diameter of the tube cap 5 is 42 mm.

[0041] The height of the sample loading tube 3 is 100 mm, and the height of the permeable stone 4 is 10 mm.

[0042] In use, it includes the following steps:

[0043] Sample cutting: Thread the sample loading tube 3 and the soil cutting head 2 together, cut the required test sample in the soil sample, remove the soil sampling head 2, press the permeable stones 4 at the upper and lower openings of the sample loading tube 3, and cut off the excess soil sample;

[0044] Immersion: Install the tube caps 5 at the upper and lower openings of the sample loading tube 3, use a small air pump to extract gas from the air suction hole 51, so that the inside of the sample loading tube 3 is in a negative pressure state, and place the entire sample loading tube in water to complete negative pressure saturation;

[0045] Sampling: After saturation is completed, remove the tube caps 5 and use the sample pusher 1 to push out the soil sample and the permeable stones 4, and the sample required for the triaxial shear instrument test can be completed.

[0046] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A triaxial shearing apparatus sample preparation device, characterized in that: The invention comprises a sample pusher (1), a soil cutting head (2), a sample carrying tube (3), a permeable stone (4) and a tube cap (5). The sample pusher (1) comprises a sample pusher plate (11) and a sample pusher rod (12). The soil cutting head (2) is screwed to the lower end of the sample carrying tube (3). The upper and lower ends of the sample-carrying tube (3) are pressed into the permeable stone (4). The tube cap (5) is sleeved on the upper end surface and the lower end surface of the sample-carrying tube (3). When sampling, the sample pushing plate (11) of the sample pushing device (1) acts on the upper end surface of the permeable stone (4) at the upper end of the sample carrying tube (3) or the lower end surface of the permeable stone (4) at the lower end of the sample carrying tube (3).

2. The triaxial shearing apparatus sample preparation device according to claim 1, characterized in that: The tube cap (5) located above the sample-carrying tube (3) protrudes from the side wall of the sample-carrying tube (3) and is provided with an air suction hole (51).

3. The triaxial shearing apparatus sample preparation device according to claim 1, characterized in that: The tube cap (5) located below the sample-carrying tube (3) protrudes from the side wall of the sample-carrying tube (3) and is provided with a water inlet hole (52).

4. The triaxial shearing apparatus sample preparation device according to claim 1, characterized in that: The upper end surface of the permeable stone (4) at the upper end of the sample-carrying tube (3) is flush with the upper end surface of the sample-carrying tube (3), and the lower end surface of the permeable stone (4) at the lower end of the sample-carrying tube (3) is flush with the lower end surface of the sample-carrying tube (3).

5. The triaxial shearing apparatus sample preparation device according to claim 1, characterized in that: The inner diameters of the soil cutting head (2) and the sample carrying tube (3) are both 39.1 mm, the diameter of the permeable stone (4) is 39.1 mm, and the diameter of the sample pushing plate (11) of the sample pushing device (1) is smaller than the inner diameter of the sample carrying tube (3); The outer diameter of the sample-carrying tube (3) is 42 mm, and the inner diameter of the tube cap (5) is 42 mm.

6. The triaxial shearing apparatus sample preparation device according to claim 1, characterized in that: The height of the sample-carrying tube (3) is 100 mm, and the height of the permeable stone (4) is 10 mm.

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