Sample separating device for geotechnical triaxial compression test

Abstract

The utility model discloses a sample separating device for a geotechnical triaxial compression test. The sample separating device comprises a sample separating pile casing and a sample separator matched with the sample separating pile casing, the sample separation pile casing comprises a base and a pile casing connected with the base, and the section size of the base is larger than that of the pile casing; three sample separation channels extending in the axial direction of the protective cylinder are uniformly distributed in the circumferential direction of the protective cylinder, and the sample separation channels extend from the upper end of the protective cylinder to the lower ends of the sample separation channels; the sample splitter is provided with sample splitting parts capable of being embedded into the sample splitting channels, and the sample splitter divides a soil sample in the sample splitting pile casing into three soil columns through the three sample splitting parts. According to the sample separating device, the shape of a soil sample can be kept through the sample separating protection cylinder in the cutting operation process, and a complete and incomplete soil column is obtained; the detachable sample separating part and the switching use of the two sample separating parts are adopted, so that the application range can be widened, and the soil sample separating device is suitable for soil samples with various properties and has very high practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical testing equipment, in particular to a sampling device for geotechnical triaxial compression testing. Background Art

[0002] Geotechnical testing is a general term for physical, mechanical, chemical and mineral testing of rocks and soils. Its purpose is to determine the basic physical and mechanical properties of soils and provide reliable calculation data for engineering surveys and designs. Among them, the triaxial compression test is a method for determining the shear strength of soils. Usually, 3-4 cylindrical specimens are used, and axial pressure is applied under different constant confining pressures to shear until failure. The triaxial compression test requires that the ratio of the specimen height to the diameter be 2.0-2.5 times, and at least 3 specimens of the same specifications must be prepared for each group of soil samples.

[0003] At present, most of the existing triaxial compression test sample dividers do not have casings. For example, the traditional sample divider directly divides the soil sample into three soil columns through a steel wire. Because there is no casing for sample division, it is easy to deviate during the process, causing the sample to break or be incomplete; some change the soil cutting wire device into a soil cutting ring, the purpose is to directly prepare the soil sample into three cylinders. For example, the Chinese utility model patent with application number 201920746099.8 discloses a triaxial test original soil sampler suitable for soft soil. The sampler has high requirements for soil samples. It is only suitable for soft soil and the soil quality is required to be uniform, without ginger stones, tree roots, etc. The adaptability is limited, and the friction between the cutter and the sample is increased. There is no casing to protect the sample. Therefore, problems of sample breakage and incompleteness will also occur during the sample preparation process.

[0004] Therefore, based on the above technical problems, technicians in this field are in urgent need of developing a sampling device for geotechnical triaxial compression testing. Utility Model Content

[0005] The utility model aims to provide a sampling device for geotechnical triaxial compression test, which keeps the shape of soil samples through sampling casings, and solves the problems of large friction and easy breakage or incompleteness of samples in the previous sampling process.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a sampling device for geotechnical triaxial compression test, which comprises:

[0008] Splitting casing; and

[0009] A sample divider used in conjunction with the sample dividing casing;

[0010] The sample separation casing comprises:

[0011] A base and a casing connected to the base, wherein the cross-sectional dimension of the base is larger than the cross-sectional dimension of the casing;

[0012] The casing is evenly distributed around the circumference thereof with three sample separation channels extending along the axial direction of the casing, wherein the sample separation channels extend from the upper end of the casing to the lower end of the sample separation channels;

[0013] The sample divider has a sample dividing part that can be embedded in the sample dividing channel. The sample divider divides the soil sample in the sample dividing casing into three soil columns through the three sample dividing parts.

[0014] Further, the base is configured as a disc structure;

[0015] The protective tube is arranged on the upper surface of the base, and the protective tube is arranged coaxially with the base;

[0016] The inner diameter of the casing is larger than the diameter of the soil sample to be cut.

[0017] Further, the sample divider comprises:

[0018] A retaining ring in a circular ring structure; and

[0019] The sample dividing part is assembled and fixed to the fixing ring;

[0020] The inner diameter of the fixing ring is larger than the outer diameter of the casing, and the fixing ring can be sleeved on the outside of the casing and move along the axial direction of the casing;

[0021] The sample dividing part is detachably mounted on the fixing ring.

[0022] Furthermore, the inner diameter of the casing is 104 mm;

[0023] The inner diameter of the fixing ring is 125 mm.

[0024] Furthermore, handles extending radially along the fixing ring are symmetrically arranged on the side surfaces of the fixing ring.

[0025] Furthermore, the sample dividing part is a sample dividing wire or a sample dividing knife.

[0026] Furthermore, when the sample dividing part is a sample dividing wire, the fixing ring is evenly provided with three positioning holes along its circumference;

[0027] A positioning portion is provided on the outer side of the fixing ring near the positioning hole;

[0028] One ends of the three sample dividing steel wires all pass through the corresponding positioning holes and are wound around the positioning portion, and the other ends of the three sample dividing steel wires extend to the center of the fixing ring and are fixed together.

[0029] Furthermore, when the sample dividing part is a sample dividing knife, the fixing ring is evenly provided with three positioning grooves along its circumference;

[0030] A positioning seat is provided at a position on the outside of the fixing ring that matches the positioning groove;

[0031] One end of the three sample dividing knives passes through the corresponding positioning slots and extends into the corresponding positioning seats, and is assembled and fixed to the positioning seats by positioning screws;

[0032] The other ends of the three sample dividing knives extend to the center of the fixing ring and are fixed together.

[0033] Furthermore, the diameter of the sampling wire is 0.25mm-0.5mm.

[0034] Furthermore, the height of the sample dividing knife is 25 mm.

[0035] In the above technical solution, the utility model provides a sampling device for geotechnical triaxial compression test, which has the following beneficial effects:

[0036] The sampling device of the utility model can maintain the shape of the soil sample during the cutting operation through the sampling casing to obtain a complete soil column without any defects; the detachable sampling part and the switchable use of two sampling parts can improve the scope of application, and the device is suitable for soil samples of various properties, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0038] Figure 1 A front view of a sampling casing of a sampling device for geotechnical triaxial compression test provided by an embodiment of the utility model;

[0039] Figure 2 A top view of a sampling casing of a sampling device for geotechnical triaxial compression test provided by an embodiment of the utility model;

[0040] Figure 3 A schematic diagram of the structure of a casing of a sampling device for geotechnical triaxial compression test provided by an embodiment of the utility model;

[0041] Figure 4 A schematic diagram of the structure of a sample divider of a geotechnical triaxial compression test sample divider provided in an embodiment of the utility model;

[0042] Figure 5 A top view of a first embodiment of a sample divider of a geotechnical triaxial compression test sample divider provided in an embodiment of the utility model;

[0043] Figure 6 A top view of a second embodiment of a sample divider of a sampling device for geotechnical triaxial compression test provided in an embodiment of the utility model.

[0044] Description of reference numerals:

[0045] 1. Sample dividing tube; 2. Sample divider;

[0046] 101. base; 102. casing; 103. sample separation channel;

[0047] 201, fixing ring; 202, handle; 203, positioning hole; 204, positioning groove;

[0048] 301, sample dividing wire; 302, positioning part; 303, sample dividing knife; 304, positioning seat; 305, positioning screw. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] See also Figures 1 to 6 As shown;

[0051] This embodiment discloses a sampling device for geotechnical triaxial compression test, the sampling device comprising:

[0052] Sampling casing 1; and

[0053] A sample divider 2 used in conjunction with the sample dividing casing 1;

[0054] The sample separation casing 1 comprises:

[0055] A base 101 and a casing 102 connected to the base 101, wherein the cross-sectional dimension of the base 101 is larger than the cross-sectional dimension of the casing 102;

[0056] Three sample separation channels 103 extending along the axial direction of the casing 102 are evenly distributed around the casing 102. The sample separation channels 103 extend from the upper end of the casing 102 to the lower end of the sample separation channels 103.

[0057] The sample divider 2 has a sample dividing part that can be embedded in the sample dividing channel 103. The sample divider 2 divides the soil sample in the sample dividing casing 102 into three soil columns through the three sample dividing parts.

[0058] Specifically, this embodiment discloses a novel sample dividing device, which includes a sample dividing casing 1 and a sample divider 2. The sample dividing casing 1 of this embodiment is divided into a base 101 and a casing 102. The base 101 supports the upper casing 102. The inside of the casing 102 is used to accommodate the soil sample to be cut and divided. The inner diameter of the casing 102 of this embodiment is preferably slightly larger than the outer diameter of the soil sample, so that the soil sample can be easily taken and placed. The sample divider 2 of this embodiment has three sample dividing parts, each of which can move along the corresponding sample dividing channel 103 of the casing 102 to divide the internal soil sample into three soil columns.

[0059] Preferably, the base 101 of this embodiment is configured as a disc structure; the casing 102 is arranged on the upper surface of the base 101, and the casing 102 is coaxially arranged with the base 101; the inner diameter of the casing 102 is larger than the diameter of the soil sample to be cut.

[0060] The present embodiment further defines the structure of the sampling casing 1, which includes a base 101 with a disc structure at the bottom and a casing 102 with a cylindrical structure at the top; wherein, in order to facilitate the taking and placing of soil samples and soil columns, the base 101 and casing 102 of the present embodiment can be designed as a detachable structure, that is, a circle of mounting grooves matching the casing 102 is provided on the base 101, and the casing 102 is embedded therein; the soil samples can also be taken and placed in an inverted manner during use; and the connection structure between the casing 102 and the base 101 is not the focus of the present application, and there are various structures that can realize the taking and placing of soil samples and soil columns, which will not be repeated here.

[0061] Preferably, the sample divider 2 of this embodiment includes:

[0062] A fixing ring 201 in a circular ring structure; and

[0063] Assemble and fix the sample dividing part on the fixing ring 201;

[0064] The inner diameter of the fixing ring 201 is larger than the outer diameter of the casing 102, and the fixing ring 201 can be sleeved on the outside of the casing 102 and move along the axial direction of the casing 102;

[0065] The sample dividing part is detachably mounted on the fixing ring 201 .

[0066] The inner diameter of the casing 102 of this embodiment is 104 mm; the inner diameter of the fixing ring 201 is 125 mm.

[0067] For ease of use, handles 202 extending radially along the fixing ring 201 are symmetrically arranged on the side surfaces of the fixing ring 201 of this embodiment.

[0068] This embodiment further defines the structure of the sample divider 2, which includes a fixed ring 201 and a sample divider installed on the fixed ring 201. In terms of size requirements, the fixed ring 201 of this embodiment needs to be able to be sleeved on the casing 102 without obstacles, that is, its inner diameter needs to be larger than the outer diameter of the casing 102, to ensure that the fixed ring 201 can move axially along the casing 102 without obstacles. Since the sample divider channel 103 is equally divided along the circumference of the casing 102, the sample divider passing through the sample divider channel 103 can divide the soil sample in the casing 102 into three equal parts into three soil columns.

[0069] Preferably, the sample dividing part of this embodiment is a sample dividing wire 301 or a sample dividing knife 303 .

[0070] See also Figure 5 As shown, embodiment 1:

[0071] The first embodiment defines a first structural form of the sample divider 2. When the sample dividing part is a sample dividing wire 301, the fixing ring 201 is evenly provided with three positioning holes 203 along its circumference.

[0072] A positioning portion 302 is provided on the outer side of the fixing ring 201 near the positioning hole 203;

[0073] One ends of the three sample dividing wires 301 pass through the corresponding positioning holes 203 and are wound around the positioning portion 302 , and the other ends of the three sample dividing wires 301 extend to the center of the fixing ring 201 and are fixed together.

[0074] Preferably, the diameter of the sampling wire 301 of the first embodiment is 0.25 mm-0.5 mm.

[0075] First, the sample dividing part of the first embodiment adopts a sample dividing wire 301. In order to realize the detachable connection of the sample dividing wire 301, a positioning hole 203 is opened at the corresponding position of the fixing ring 201. One end of the sample dividing wire 301 can pass through the corresponding positioning hole 203 and be fixed together with the corresponding positioning part in a winding manner. At this time, the sample dividing wire 301 is straightened, and the other ends of the three sample dividing wires 301 are connected together to form a center point, which coincides with the center of the fixing ring 201 to ensure the uniformity of the sample dividing.

[0076] See also Figure 6 As shown, Example 2:

[0077] When the sample dividing part is a sample dividing knife 303, the fixing ring 201 is evenly provided with three positioning grooves 204 along its circumference;

[0078] A positioning seat 304 is provided at a position on the outside of the fixing ring 201 that matches the positioning groove 204;

[0079] One end of the three sample dividing knives 303 passes through the corresponding positioning slots 204 and extends into the corresponding positioning seats 304, and is assembled and fixed to the positioning seats 304 by positioning screws 305;

[0080] The other ends of the three sample dividing knives 303 extend to the center of the fixing ring 201 and are fixed together.

[0081] The height of the dividing knife 303 is 25 mm.

[0082] The second embodiment discloses a sample divider 2 with a sample dividing knife 303 as a sample dividing part, which is different from the sample dividing wire 301 of the first embodiment in that a positioning groove 204 is processed on the fixed ring 201, the sample dividing knife 303 is embedded in the positioning groove 204, and the outer end of the sample dividing knife 303 extends to the outside of the fixed ring 201 and is embedded in the corresponding positioning seat 304, and then the positioning seat 304 and the sample dividing knife 303 are assembled and fixed by a positioning screw 305. Similar to the sample dividing wire 301, the end of the sample dividing knife 303 located at the center of the fixed ring 201 is connected as a whole to form a center point.

[0083] In the above technical solution, the utility model provides a sampling device for geotechnical triaxial compression test, which has the following beneficial effects:

[0084] The sampling device of the utility model can maintain the shape of the soil sample during the cutting operation through the sampling casing 1 to obtain a complete soil column without any defects; the use of a detachable sampling part and the switching use of two sampling parts can improve the scope of application and is suitable for soil samples of various properties, and has strong practicality.

[0085] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sampling device for geotechnical triaxial compression test, characterized in that: The sample dividing device comprises: A sample separation sleeve (1); and A sample divider (2) used in conjunction with the sample dividing casing (1); The sample separation casing (1) comprises: A base (101) and a protective tube (102) connected to the base (101), wherein the cross-sectional dimension of the base (101) is greater than the cross-sectional dimension of the protective tube (102); Three sample separation channels (103) are evenly distributed around the circumference of the protective tube (102) and extend along the axial direction of the protective tube (102), and the sample separation channels (103) extend from the upper end of the protective tube (102) to the lower end of the sample separation channels (103); The sample divider (2) has a sample dividing part that can be embedded in the sample dividing channel (103), and the sample divider (2) divides the soil sample in the sample dividing casing (1) into three soil columns through the three sample dividing parts; The sample divider (2) comprises: A fixing ring (201) in a circular ring structure; and The sample dividing portion is assembled and fixed to the fixing ring (201); The inner diameter of the fixing ring (201) is greater than the outer diameter of the casing (102), and the fixing ring (201) can be sleeved on the outside of the casing (102) and move along the axial direction of the casing (102); The sample dividing portion is detachably mounted on the fixing ring (201); The sample dividing part is a sample dividing wire (301) or a sample dividing knife (303); When the sample dividing part is a sample dividing wire (301), the fixing ring (201) is evenly provided with three positioning holes (203) along its circumference; A positioning portion (302) is provided on the outer side of the fixing ring (201) near the positioning hole (203); One end of each of the three sample dividing steel wires (301) passes through the corresponding positioning hole (203) and is wound around the positioning portion (302), and the other ends of the three sample dividing steel wires (301) extend to the center of the fixing ring (201) and are fixed together; When the sample dividing part is a sample dividing knife (303), the fixing ring (201) is evenly provided with three positioning grooves (204) along its circumference; A positioning seat (304) is provided at a position on the outside of the fixing ring (201) that matches the positioning groove (204); One end of the three sample dividing knives (303) passes through the corresponding positioning slots (204) and extends into the corresponding positioning seats (304), and is assembled and fixed to the positioning seats (304) by positioning screws (305); The other ends of the three sample dividing knives (303) extend to the center of the fixing ring (201) and are fixed together.

2. A sampling device for geotechnical triaxial compression test according to claim 1, characterized in that: The base (101) is configured as a disc structure; The protective tube (102) is arranged on the upper surface of the base (101), and the protective tube (102) and the base (101) are coaxially arranged; The inner diameter of the casing (102) is larger than the diameter of the soil sample to be cut.

3. A sampling device for geotechnical triaxial compression test according to claim 1, characterized in that: The inner diameter of the casing (102) is 104 mm; The inner diameter of the fixing ring (201) is 125 mm.

4. A sampling device for geotechnical triaxial compression test according to claim 1, characterized in that: A handle (202) extending radially along the fixing ring (201) is symmetrically arranged on the side surface of the fixing ring (201).

5. The sampling device for geotechnical triaxial compression test according to claim 1, characterized in that: The diameter of the sampling steel wire (301) is 0.25 mm-0.5 mm.

6. The sampling device for geotechnical triaxial compression test according to claim 1, characterized in that: The height of the sample dividing knife (303) is 25 mm.

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