CN107576543B - Undisturbed soil annular soil sample preparation device and method for geotechnical annular shear test - Google Patents
Undisturbed soil annular soil sample preparation device and method for geotechnical annular shear test Download PDFInfo
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- CN107576543B CN107576543B CN201710868193.6A CN201710868193A CN107576543B CN 107576543 B CN107576543 B CN 107576543B CN 201710868193 A CN201710868193 A CN 201710868193A CN 107576543 B CN107576543 B CN 107576543B
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Abstract
The invention provides a sample preparation device and a sample preparation method for an annular undisturbed soil sample for a geotechnical annular shear test, wherein the sample preparation device comprises a square base, an annular base, a large annular cutter, a right-angle guard ring, a disc, a central annular cutter, a guide screw and a fixing bracket; the annular base is fixedly arranged on the square base through the fixing support; the large ring cutter is embedded on the side wall of the annular base; the outer diameter of the disc is equal to the inner diameter of the annular base; the central ring cutter is integrally shaped like a door and is arranged on the right-angle guard ring; the central cutting ring is coaxial with the annular base; the guide screw rod passes through the fixed bracket, the central cutting ring, the disc and the square base; the guide screw is provided with a first nut, a second nut and a third nut; the first nut is arranged at the top of the central cutting ring; the second nut is arranged on the lower surface of the disc; the third nut is arranged on the lower surface of the square base. The invention has simple structure and convenient operation, and can effectively solve the problem of preparing the annular sample before the geotechnical annular shear test.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering geotechnical indoor tests, relates to a soil sample preparation device and a soil sample preparation method, and particularly relates to an undisturbed soil annular soil sample preparation device and a soil sample preparation method for geotechnical annular shear tests.
Background
The ring shear test is a kind of soil mechanics indoor test, because the sample is cyclic, the shearing rotates along the circumferencial direction, so the total area of shearing face is unchangeable, and the shearing displacement is unrestricted, is applicable to the residual intensity or the ultimate strength of measuring the soil body under the large deformation. Such shear tests are also commonly used to study the shear characteristics of interfaces between different materials to determine the strength and deformation parameters of the interfaces, such as: the method is used for researching the contact surface characteristics between the soil and the concrete or steel, and between the soil and the geosynthetic material and between different soil materials.
For an undisturbed soil sample taken from a site, in order to study the residual strength or the ultimate strength of a soil body, the soil sample needs to be prepared into a ring shape with the thickness of 2 cm; when the characteristics of the contact surface of the soil body and different materials are studied, the soil sample is required to be prepared into a ring shape with the thickness of 1 cm; the existing sample preparation technology cannot finish the preparation of the undisturbed soil annular soil samples with different thicknesses by means of the same device, and the existing technology is easy to break the annular samples in the soil sample demoulding link, so that sample preparation failure is caused.
Disclosure of Invention
In order to solve the problems, the invention provides the undisturbed soil annular soil sample preparation device and the undisturbed soil annular soil sample preparation method for the geotechnical annular shear test, which have the advantages of simple structure and convenience in operation and can effectively solve the preparation problem of the annular sample for the geotechnical annular shear test.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a geotechnical ring shear test undisturbed soil annular soil sample preparation appearance device which characterized in that: the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test comprises a square base, an annular base, a large ring cutter, a right-angle guard ring, a disc, a central ring cutter, a guide screw and a fixed support; the annular base is fixedly arranged on the square base through the fixing support; the large ring cutter is embedded on the side wall of the annular base and can be taken out from the side wall of the annular base; the disc is arranged inside the annular base; the right-angle guard ring is arranged at the top of an undisturbed soil sample to be made into an annular soil sample; the central ring cutter is integrally shaped like a door and is arranged on the right-angle guard ring; the central cutting ring, the large cutting ring, the disc and the annular base are coaxial; one end of the guide screw rod penetrates through the fixed support, and the other end of the guide screw rod penetrates through the central cutting ring, the disc and the square base in sequence; the guide screw is provided with a first nut, a second nut and a third nut; the first nut is arranged at the top of the central cutting ring and drives the central cutting ring to move downwards along the axial direction of the annular base; the second nut is arranged on the lower surface of the disc; the third nut is arranged on the lower surface of the square base; the center cutting ring, the disc and the square base are provided with guide screw through holes; the outer diameter of the first nut is larger than the inner diameter of the guide screw through hole on the central cutting ring; the outer diameter of the second nut is larger than the inner diameter of the guide screw through hole on the disc and smaller than the inner diameter of the guide screw through hole on the square base; the thickness of the second nut is smaller than or equal to that of the square base; the outer diameter of the third nut is larger than the inner diameter of the guide screw through hole on the square base; .
Preferably, the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises a circular ring arranged between the right-angle guard ring and the undisturbed soil sample top.
Preferably, the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises an annular gasket arranged between the square base and the disc; the annular gasket is one or more pieces.
Preferably, the annular gasket used in the invention is a single piece or a split piece; when the annular gasket is a split piece, the annular gasket is formed by splicing a plurality of arc-shaped sheet bodies.
Preferably, the central cutting ring adopted by the invention is in a barrel-shaped structure with a closed upper end and an open lower end and a cutting edge; the side wall of the central ring cutter is provided with a circular flange along the radial direction of the central ring cutter; the top of the central cutting ring is provided with a through hole for the guide screw to penetrate through; the first nut drives the central cutting ring to move downwards along the axial direction of the annular base and is finally clung to the right-angle guard ring through the annular flange.
Preferably, the top of the central cutting ring adopted by the invention is also provided with a ventilation drain hole; the ventilation and water draining holes are one or more; when the number of the ventilation drainage holes is multiple, the ventilation drainage holes are uniformly distributed at the top of the central ring cutter.
Preferably, the right-angle guard ring adopted by the invention is an integral piece or a split piece made of angle steel; when the right-angle guard ring is a split piece, the right-angle guard ring is formed by splicing a plurality of arc-shaped bodies.
Preferably, the disc adopted by the invention is provided with a through hole for the lead screw to penetrate; the disc is also provided with one or more ventilation drainage holes; when the number of the ventilation drainage holes is multiple, the ventilation drainage holes are uniformly distributed on the disc.
An undisturbed soil annular soil sample preparation method based on the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test is characterized by comprising the following steps: the method comprises the following steps:
1) Fixing the annular base on the square base by using a screw rod of the fixing bracket, and then placing the disc on the annular base;
2) Cutting out an original soil cake from an original soil block by using a large ring cutter, scraping the upper surface and the lower surface of the original soil cake, putting the large ring cutter and the cut original soil cake into an annular base, pushing the original soil cake downwards to separate the original soil cake from the large ring cutter, and enabling the original soil cake to fall on a disc; digging a lead screw through hole in the center of the undisturbed soil cake, enabling the lead screw to pass through the lead screw through holes in the centers of the undisturbed soil cake and the disc, and screwing a second nut of the lead screw on the lower surface of the disc;
3) Placing a right-angle guard ring on the top of the undisturbed soil cake, passing the central cutting ring through the guide screw, and then placing the cutting edge of the central cutting ring on the top of the undisturbed soil cake, so as to ensure that the central cutting ring is coaxial with the annular base; then screwing a first nut of the guide screw on the top of the central cutting ring, and screwing a third nut of the guide screw on the lower surface of the square base; simultaneously, the guide screw is fixed through the fixing bracket;
4) Rotating a first nut of the guide screw rod to enable the center ring cutter to move downwards along the axial direction of the annular base to start cutting the original soil cake, stopping when the cutting edge of the center ring cutter reaches the disc, enabling the annular flange of the center ring cutter to be clung to the right-angle guard ring, and enabling the original soil cake to be completely cut into an annular sample;
5) Taking out the fixed support from the top of the lead screw, unscrewing the third nut of the lead screw, taking out the circular sample obtained by cutting in the step 4), the right-angle guard ring and the center ring together through the lead screw, and dismantling the first nut of the lead screw, the second nut of the lead screw, the center ring, the right-angle guard ring and the circular disc to obtain the original soil annular soil sample for the ring shear test.
Preferably, the method adopted by the invention further comprises the steps of arranging an annular gasket between the square base and the disc in the step 1), arranging a circular ring between the original soil cake and the right-angle guard ring in the step 3), and carrying out rotary cutting on the circular ring-shaped sample along the outer edge of the disc by using a wire saw based on the outer diameter of the disc after removing the right-angle guard ring in the step 5).
The invention has the advantages that:
the invention provides an undisturbed soil annular soil sample preparation device and a sample preparation method for a geotechnical annular shear test, wherein the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test comprises a square base, an annular base, a large ring cutter, a right angle guard ring, a disc, a central ring cutter, a guide screw and a fixed support; the annular base is fixedly arranged on the square base through the fixing support; the large ring cutter is embedded on the side wall of the annular base and can be taken out from the side wall of the annular base; the disc is arranged inside the annular base; the outer diameter of the disc is equal to the inner diameter of the annular base; the right-angle guard ring is arranged at the top of an undisturbed soil sample to be made into an annular soil sample; the central ring cutter is integrally shaped like a door and is arranged on the right-angle guard ring; the central cutting ring, the large cutting ring and the annular base are coaxial; one end of the guide screw rod penetrates through the fixed support, and the other end of the guide screw rod sequentially penetrates through the central cutting ring, the disc and the square base; the guide screw is provided with a first nut, a second nut and a third nut; the first nut is arranged on the top of the central cutting ring and drives the central cutting ring to move downwards along the axial direction of the annular base; the second nut is arranged on the lower surface of the disc; the third nut is arranged on the lower surface of the square base. According to the invention, through the combination of different parts, annular undisturbed soil samples with different thicknesses can be prepared, and the annular undisturbed soil sample is used for geotechnical ring shear tests. The modular component is used in the invention, the structure is simple, the operation is convenient, the uniformity of the prepared sample is good, the sample is not easy to break in the demoulding process, and the survival rate of the soil sample preparation in the geotechnical ring shearing test is improved.
Drawings
FIG. 1 is a schematic structural view of an undisturbed soil annular soil sample preparation device for preparing undisturbed soil annular samples with the thickness of 1cm based on a geotechnical annular shear test provided by the invention;
FIG. 2 is a schematic structural view of an undisturbed soil annular soil sample preparation device for preparing undisturbed soil annular samples with the thickness of 2cm based on a geotechnical annular shear test provided by the invention;
in the figure:
1-a square base; 2-an annular base; 3-large ring cutters; 4-annular gaskets; 5-right angle guard rings; 6-a circular ring; 7-a disc; 8-a central ring cutter; 9-a lead screw; 10-fixing the bracket.
Detailed Description
In order to enhance the understanding of the present invention, the following examples of the present invention will be described in detail, and the following examples are given by taking the technical scheme of the present invention as a premise, and the detailed implementation and specific operation procedures are given, but the protection scope of the present invention is not limited to the following examples.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The invention provides an undisturbed soil annular soil sample preparation device for a geotechnical annular shear test, which comprises a square base 1, an annular base 2, a large ring cutter 3, a right angle guard ring 5, a disc 7, a central ring cutter 8, a guide screw 9 and a fixed bracket 10, wherein the square base is provided with a plurality of annular grooves; the annular base 2 is fixedly arranged on the square base 1 through a fixing bracket 10; the large ring cutter 3 is embedded on the side wall of the annular base 2 and can be taken out from the side wall of the annular base 2; the disc 7 is arranged inside the annular base 2; the outer diameter of the disc 7 is equal to the inner diameter of the annular base 2; the right-angle guard ring 5 is arranged at the top of an undisturbed soil sample to be made into an annular soil sample; the central cutting ring 8 is integrally shaped like a door and is arranged on the right-angle guard ring 5; the central cutting ring 8, the large cutting ring 3 and the annular base 2 are coaxial; one end of the guide screw 9 penetrates through the fixed support 10, and the other end sequentially penetrates through the central cutting ring 8, the disc 7 and the square base 1; the guide screw 9 is provided with a first nut, a second nut and a third nut; the first nut is arranged on the top of the central cutting ring 8 and drives the central cutting ring 8 to move downwards along the axial direction of the annular base 2; the second nut is arranged on the lower surface of the disc 7; the third nut is arranged on the lower surface of the square base 1.
Wherein, a hexagonal hole is arranged in the center of the square base 1, so that a second nut and a guide screw can conveniently pass through, a screw hole is respectively arranged at the middle points of four sides, and the annular base is fixed on the fixing bracket 10; the outer diameter of the annular base 2 is the diameter of an inscribed circle of the square base 1, four screw holes fixed with the square base 1 are distributed in two mutually perpendicular directions which cross the center of the circle and are parallel to four sides of the square base 1, and the annular base 2 can be fixed on the square base 1 through screws of the fixing support 10; the large ring cutter 3 is embedded on the annular base 2, and the large ring cutter 3 can be taken out and used for cutting undisturbed soil samples for next operation. The center of the disc 7 is provided with a guide screw through hole, so that the guide screw 9 can conveniently penetrate, the disc 7 is placed below the center cutting ring, the cutting depth of the center cutting ring 8 can be limited, the sample can be conveniently supported, the guide screw 9, the center cutting ring 8 and the disc 7 are taken out of the annular base, and a plurality of small holes are distributed on the disc 7 and serve as exhaust and drainage channels in soil sample preparation. The lead screw 9 is a screw rod, three hexagonal nuts are arranged on the screw rod, the central cutting ring 8 or the disc 7 is positioned below the first nut, and vertical pressure is applied to the central cutting ring by screwing the first nut to cut a soil sample; when the screw rod is lifted, the second nut can pass through a hexagonal hole in the center of the square base 1, so that the prepared sample, the center cutting ring 8 and the disc 7 are taken out of the annular base integrally; the third nut is larger than the hexagonal hole in the center of the square base 1 and works together with the first nut to restrict the upward movement of the screw rod during the process of cutting or compacting the soil sample. The fixed support 10 is composed of two screws and a plate beam with three holes, the two screws mainly play a role in fixing the connection of the square base and the annular base and supporting the three-hole plate beam, and the guide screw 9 is restrained by the middle hole of the three-hole plate beam to ensure that the central ring cutter 8 moves along the vertical direction.
The undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises a circular ring 6 arranged between the undisturbed soil sample top of the annular soil sample to be prepared and the right angle guard ring 5.
The undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises an annular gasket 4 arranged between the square base 2 and the disc 7; the annular gasket 4 is one or more pieces; when the annular gasket 4 is a plurality of pieces, the thickness of each annular gasket 4 of the plurality of pieces of annular gaskets 4 is the same or non-equivalent.
The annular gasket 4 is a single piece or a separate piece; when the annular gasket 4 is a split piece, the annular gasket 4 is formed by splicing a plurality of arc-shaped sheet bodies. As the preferable annular gasket in the annular base consists of four 90-degree 1/4 annular sheets, the installation and the disassembly are convenient, the outer diameter of the annular gasket is the inner diameter of the annular base, the annular gasket has different thicknesses, and gaskets with different thickness specifications can be stacked according to sample preparation requirements.
The central cutting ring 8 is in a barrel-shaped structure with a closed upper end and an open lower end and a cutting edge; a circular flange is arranged on the side wall of the central cutting ring 8 along the radial direction of the central cutting ring 8; the top of the central cutting ring 8 is provided with a through hole for the lead screw 9 to penetrate through; the first nut drives the central cutter 8 to move downwards along the axial direction of the annular base 2 and is finally clung to the right-angle guard ring 5 through the annular flange.
The top of the central cutting ring 8 is also provided with a ventilation drain hole; the ventilation and water drainage holes are one or more; when the number of the ventilation drainage holes is multiple, the ventilation drainage holes are uniformly distributed at the top of the central ring cutter 8.
The right-angle guard ring 5 is an integral piece or a split piece made of angle steel; when the right-angle guard ring 5 is a split piece, the right-angle guard ring 5 is formed by splicing a plurality of arc-shaped bodies. Preferably, the right-angle guard ring consists of four 90-degree 1/4 circular angle steel plates, and has the main functions of limiting the cutting depth of a central ring cutter and limiting the outer diameter of a sample; the four right-angle guard rings are restrained by the annular base, so that the integrity of the four right-angle guard rings is ensured, and the annular sample is protected from being damaged; the rings are stacked in the right-angle guard ring, and the thickness of the lower ring of the right-angle guard ring can be changed to adjust the height of the manufactured annular soil sample.
The disc 7 is provided with a through hole for the lead screw 9 to penetrate through; the disc 7 is also provided with one or more ventilation drainage holes; when the number of the ventilation and water discharge holes is multiple, the ventilation and water discharge holes are uniformly distributed on the disc 7.
An undisturbed soil annular soil sample preparation method based on an undisturbed soil annular soil sample preparation device for the geotechnical annular shear test comprises the following steps:
1) The annular base 2 is fixed on the square base 1 by using the screw of the fixing bracket 10, and then the disc 7 is placed in the annular base 2;
2) Cutting out an original soil cake from an original soil block by using a large ring cutter 3, scraping the upper surface and the lower surface of the original soil cake, putting the large ring cutter 3 and the cut original soil cake into an annular base 2, pushing the original soil cake downwards to separate the original soil cake from the large ring cutter 3, and enabling the original soil cake to fall on a disc 7; digging a lead screw through hole in the center of the undisturbed soil cake, enabling a lead screw 9 to pass through the lead screw through holes in the centers of the undisturbed soil cake and the disc 7, and screwing a second nut of the lead screw 9 on the lower surface of the disc 7;
3) Placing a piece of circular filter paper on the top of the undisturbed soil cake, then placing a right-angle guard ring 5, passing a central cutter 8 through a guide screw 9, and then placing the cutting edge of the central cutter 8 on the top of the undisturbed soil cake to ensure that the central cutter 8 is coaxial with the annular base 2; then a first nut of the guide screw 9 is screwed on the top of the central cutting ring 8, and a third nut of the guide screw 9 is screwed on the lower surface of the square base 1; at the same time, the guide screw 9 is fixed through the fixing bracket 10;
4) Rotating the first nut of the guide screw 9 to enable the center cutter 8 to move downwards along the axial direction of the annular base 2 to start cutting the original soil cake, stopping when the cutting edge of the center cutter 8 reaches the disc 7, enabling the annular flange of the center cutter 8 to be tightly attached to the right-angle guard ring 5, and enabling the original soil cake to be completely cut into an annular sample;
5) And taking out the fixed support 10 from the top of the guide screw 9, unscrewing the third nut of the guide screw 9, taking out the circular sample, the right-angle guard ring 5 and the center ring cutter 8 obtained by cutting the disc 7 and the step 4 through the guide screw 9, and removing the first nut of the guide screw 9, the second nut of the guide screw 9, the center ring cutter 8, the right-angle guard ring 5 and the disc 7 to obtain the original soil ring soil sample for the ring shear test.
The step 1) further comprises a step of arranging an annular gasket 4 between the square base 1 and the disc 7, a step of arranging a circular ring 6 before the original soil cake and the right angle guard ring 5 in the step 3), and a step of rotating and cutting the circular ring sample along the outer edge of the disc 7 by using a wire saw based on the outer diameter of the disc 7 after the right angle guard ring 5 is removed in the step 5).
Example 1
A sample preparation method and a sample disassembly operation method for preparing an undisturbed soil annular sample with the thickness of 1 cm.
As shown in FIG. 1, the invention provides a schematic diagram of an original soil ring sample with the thickness of 1cm, wherein a ring sample with the outer diameter of 15cm, the inner diameter of 10cm and the thickness of 1cm is required to be prepared, and the ring sample consists of a square base 1, a ring base 2, a large ring cutter 3, a ring gasket 4, a right-angle guard ring 5, a ring 6, a disc 7, a center ring cutter 8, a guide screw 9 and a fixed bracket 10; the square base 1 is connected with the annular base 2 through two fixed support screws, two layers of annular gaskets 4 with the thickness of 1cm and one layer of annular gasket 4 with the thickness of 0.5cm are arranged in the annular base 2, the disc 7 is placed on the annular gasket 4, the disc 7 and the annular base 2 keep the same axle center, a piece of circular filter paper is placed on the disc 7, the subsequent sample disassembly is convenient, a 2cm thick original soil cake is cut out from the original soil block by using the large ring cutter 3, the upper surface and the lower surface are scraped flat, the large ring cutter 3 and the soil cake are buckled on the annular base 2, the soil sample is separated from the large ring cutter 3, the soil sample falls on the disc 7, the soil cake is cut along the upper side of the annular base 2 by using a wire saw, the soil sample is cut into a 1cm thick soil cake, a small hole is drawn in the middle of the soil cake, the middle of the soil cake is aligned to the center of the disc 7, the guide screw 9 penetrates through the soil cake and the guide screw through hole in the center of the disc 7, the second nut of the guide screw 8 is screwed on, the whole disc and the soil cake are lifted up through the guide screw 8, the annular gasket 4 in the annular base 2 is taken out, the disc 7 and the soil are put back into the annular base 2, a piece of circular filter paper is placed above the soil cake, then the circular ring 6 and the right-angle guard ring 5 are placed, the edge of the center ring 8 passes through the right-angle guard ring 5 and the circular ring 6, the first nut and the second nut of the guide screw 9 are arranged, the three-hole plate beam of the fixed bracket is covered, the first nut on the center ring 8 is screwed on to enable the first nut to move downwards so as to cut the soil cake by applying pressure downwards, when the edge of the center ring 8 reaches the disc 7, the soil cake is completely cut and is wrapped between the disc 7 and the center ring 8, then the third nut of the guide screw 9 is loosened, the soil sample together with the disc 7, the circular ring 6, the right-angle guard ring 5 and the center ring 8 is lifted up through the guide screw 9, taking out the right-angle guard ring 5, cutting off a circle of soil sample along the outer sides of the circular flange of the circular disc 7 and the central cutting ring 8 by using a wire saw, thus obtaining an annular undisturbed soil sample with the outer diameter of 15cm, the inner diameter of 10cm and the thickness of 1cm, detaching the guide screw 9, taking out the central cutting ring 8 upwards, removing the circular ring 6 upwards, and after demolding the soil sample, moving the annular sample from the circular disc 7 to a ring shear apparatus to perform geotechnical ring shear test.
Example 2
A sample preparation method and a sample disassembly operation method for preparing an undisturbed soil annular sample with the thickness of 2 cm.
As shown in FIG. 2, the invention provides a schematic diagram of an original soil ring sample with the thickness of 2cm, wherein the original soil ring sample is a ring sample with the outer diameter of 15cm, the inner diameter of 10cm and the thickness of 2cm, and the ring sample is prepared by a square base 1, a ring base 2, a large ring cutter 3, a ring gasket 4, a right-angle guard ring 5, a disc 7, a central ring cutter 8, a guide bolt 9 and a fixed bracket 10; the square base 1 is connected with the annular base 2 through two fixing support screws 10, a layer of annular gasket 4 with the thickness of 1cm is arranged in the annular base, a disc 7 is placed on the annular gasket 4, a piece of circular filter paper is placed on the disc 7, the subsequent sample disassembly is facilitated, a 2cm thick original soil cake is cut out from the original soil block by using the large ring cutter 3, the large ring cutter 3 and the soil cake are buckled on the annular base 2, the soil sample is separated from the large ring cutter 3, the soil sample falls on the disc 7, a piece of circular filter paper is placed on the soil sample, a small hole is formed in the middle of the soil sample and aligned with the center of the disc 7, a right-angle guard ring 5 is placed above the soil cake, a knife edge of the center ring cutter 8 passes through the right-angle guard ring 5, a guide screw 9 passes through the center ring cutter 8, the disc 7 and the square base 1, a third nut of the guide screw 9 is arranged, the three-beam cover of the fixing support is arranged, the first nut on the central cutting ring 8 is screwed down to apply pressure to enable the first nut to move downwards to cut a soil sample, when the edge of the central cutting ring 8 reaches the disc 7, a soil cake is completely cut and wrapped between the disc 7 and the central cutting ring 8, then the third nut of the guide screw 9 is loosened, the soil sample, the disc 7, the right-angle guard ring 5 and the central cutting ring 8 are lifted together through the guide screw 9, the right-angle guard ring 5 is taken out, then a circle of soil sample outside the circular flange, which is close to the disc 7 and the central cutting ring 8, is cut off by a wire saw, thus an annular original soil sample with the outer diameter of 15cm, the inner diameter of 10cm and the thickness of 2cm is obtained, the guide screw 9 is detached, the central cutting ring 8 is taken up, and after the soil sample is demolded, the annular sample is moved onto the ring shear apparatus from the disc 7, and then the geotechnical ring shear test can be carried out.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a geotechnical ring shear test undisturbed soil annular soil sample preparation appearance device which characterized in that: the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test comprises a square base (1), an annular base (2), a large annular cutter (3), a right angle guard ring (5), a disc (7), a central annular cutter (8), a guide screw (9) and a fixed bracket (10); the annular base (2) is fixedly arranged on the square base (1) through a fixing bracket (10); the large ring cutter (3) is embedded on the side wall of the annular base (2) and can be taken out from the side wall of the annular base (2); the disc (7) is arranged inside the annular base (2); the right-angle guard ring (5) is arranged at the top of an undisturbed soil sample to be made into an annular soil sample; the central ring cutter (8) is integrally gate-shaped and is arranged on the right-angle guard ring (5); the center cutting ring (8), the large cutting ring (3), the disc (7) and the annular base (2) are coaxial; one end of the guide screw (9) penetrates through the fixed support (10), and the other end of the guide screw penetrates through the center cutting ring (8), the disc (7) and the square base (1) in sequence; the guide screw (9) is provided with a first nut, a second nut and a third nut; the first nut is arranged on the top of the central cutting ring (8) and drives the central cutting ring (8) to move downwards along the axial direction of the annular base (2); the second nut is arranged on the lower surface of the disc (7); the third nut is arranged on the lower surface of the square base (1); the center cutting ring (8), the disc (7) and the square base (1) are all provided with guide screw through holes; the outer diameter of the first nut is larger than the inner diameter of the guide screw through hole on the central cutting ring (8); the outer diameter of the second nut is larger than the inner diameter of the guide screw through hole on the disc (7) and smaller than the inner diameter of the guide screw through hole on the square base (1); the thickness of the second nut is smaller than or equal to that of the square base (1); the outer diameter of the third nut is larger than the inner diameter of the guide screw through hole on the square base (1).
2. The geotechnical ring shear test undisturbed soil ring soil sample preparation device according to claim 1, wherein: the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises a circular ring (6) arranged between the right-angle guard ring (5) and the undisturbed soil sample top.
3. The geotechnical ring shear test undisturbed soil ring soil sample preparation device according to claim 2, wherein: the undisturbed soil annular soil sample preparation device for the geotechnical annular shear test further comprises an annular gasket (4) arranged between the square base (1) and the disc (7); the annular gasket (4) is one or more pieces.
4. The geotechnical ring shear test undisturbed soil ring soil sample preparation device according to claim 3, wherein: the annular gasket (4) is a whole piece or a split piece; when the annular gasket (4) is a split piece, the annular gasket (4) is formed by splicing a plurality of arc-shaped sheet bodies.
5. The geotechnical ring shear test undisturbed soil ring soil sample preparation device according to claim 1 or 2 or 3 or 4, wherein: the central cutting ring (8) is of a barrel-shaped structure with a closed upper end and an open lower end and a cutting edge; a circular flange is arranged on the side wall of the central ring cutter (8) along the radial direction of the central ring cutter (8); the top of the central cutting ring (8) is provided with a through hole for the lead screw (9) to penetrate through; the first nut drives the central cutting ring (8) to move downwards along the axial direction of the annular base (2) and is finally clung to the right-angle guard ring (5) through the annular flange.
6. The geotechnical ring shear test undisturbed soil ring soil sample preparation device as claimed in claim 5, wherein: the top of the central cutting ring (8) is also provided with a ventilation drain hole; the ventilation and water draining holes are one or more; when the number of the ventilation drainage holes is multiple, the ventilation drainage holes are uniformly distributed at the top of the central ring cutter (8).
7. The geotechnical ring shear test undisturbed soil ring soil sample preparation device as claimed in claim 6, wherein: the right-angle guard ring (5) is an integral piece or a split piece made of angle steel; when the right-angle guard ring (5) is a split piece, the right-angle guard ring (5) is formed by splicing a plurality of arc-shaped bodies.
8. The geotechnical ring shear test undisturbed soil ring soil sample preparation device as claimed in claim 7, wherein: the disc (7) is provided with a through hole for the lead screw (9) to penetrate through; the disc (7) is also provided with one or more ventilation and drainage holes; when the number of the ventilation drainage holes is multiple, the ventilation drainage holes are uniformly distributed on the disc (7).
9. An undisturbed soil annular soil sample preparation method based on the geotechnical annular soil sample preparation device of claim 8, which is characterized in that: the method comprises the following steps:
1) The annular base (2) is fixed on the square base (1) by using a screw rod of the fixing bracket (10), and then the disc (7) is placed on the annular base (2);
2) Cutting out an original soil cake from an original soil block by using a large ring cutter (3), scraping the upper surface and the lower surface of the original soil cake, putting the large ring cutter (3) and the cut original soil cake into an annular base (2), pushing the original soil cake downwards to separate the original soil cake from the large ring cutter (3), and enabling the original soil cake to fall on a disc (7); digging a lead screw through hole in the center of the undisturbed soil cake, enabling a lead screw (9) to pass through the lead screw through holes in the centers of the undisturbed soil cake and the disc (7), and screwing a second nut of the lead screw (9) on the lower surface of the disc (7);
3) Placing a right-angle guard ring (5) on the top of an undisturbed soil cake, passing a central cutting ring (8) through a guide screw (9), and then placing the cutting edge of the central cutting ring (8) on the top of the undisturbed soil cake to ensure that the central cutting ring (8) is coaxial with the annular base (2); then a first nut of the guide screw (9) is screwed on the top of the central cutting ring (8), and a third nut of the guide screw (9) is screwed on the lower surface of the square base (1); simultaneously, the guide screw (9) is fixed through the fixing bracket (10);
4) Rotating a first nut of the guide screw (9) to enable the center cutter (8) to move downwards along the axial direction of the annular base (2) to start cutting the original soil cake, stopping when the cutting edge of the center cutter (8) reaches the disc (7), enabling the annular flange of the center cutter (8) to be clung to the right-angle guard ring (5), and enabling the original soil cake to be completely cut into an annular sample;
5) Taking out the fixed support (10) from the top of the lead screw (9) and unscrewing a third nut of the lead screw (9), taking out the circular sample obtained by cutting the disc (7) and the step 4, the right-angle guard ring (5) and the center ring cutter (8) together through the lead screw (9), and dismantling the first nut of the lead screw (9), the second nut of the lead screw (9), the center ring cutter (8), the right-angle guard ring (5) and the disc (7) to obtain the original soil ring soil sample for the ring shearing test.
10. The method according to claim 9, wherein: the method further comprises the steps of arranging an annular gasket (4) between the square base (1) and the disc (7), arranging a circular ring (6) between the original soil cake and the right-angle guard ring (5) in the step 3), and carrying out rotary cutting on the circular ring-shaped sample along the outer edge of the disc (7) by using a wire saw based on the outer diameter of the disc (7) after the right-angle guard ring (5) is removed in the step 5).
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| CN108844766B (en) * | 2018-06-01 | 2024-05-17 | 中国科学院地理科学与资源研究所 | Undisturbed soil collecting device |
| CN110044674A (en) * | 2019-05-21 | 2019-07-23 | 浙江双和环境建设有限公司 | Cutting ring sample stripper after a kind of electrodynamic type consolidation |
| CN110567755A (en) * | 2019-10-09 | 2019-12-13 | 中南大学 | Numerical control type cutting ring soil sampler and control method thereof |
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