CN111103185B - Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method - Google Patents

Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method Download PDF

Info

Publication number
CN111103185B
CN111103185B CN202010033265.7A CN202010033265A CN111103185B CN 111103185 B CN111103185 B CN 111103185B CN 202010033265 A CN202010033265 A CN 202010033265A CN 111103185 B CN111103185 B CN 111103185B
Authority
CN
China
Prior art keywords
sample preparation
sample
soil
coarse
spinning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010033265.7A
Other languages
Chinese (zh)
Other versions
CN111103185A (en
Inventor
杨丰春
刘洪光
古一栋
魏峥嵘
李智杰
蔡蕊
吴亚中
李冰雪
贾飞飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shihezi University
Original Assignee
Shihezi University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shihezi University filed Critical Shihezi University
Priority to CN202010033265.7A priority Critical patent/CN111103185B/en
Publication of CN111103185A publication Critical patent/CN111103185A/en
Application granted granted Critical
Publication of CN111103185B publication Critical patent/CN111103185B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36—Embedding or analogous mounting of samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36—Embedding or analogous mounting of samples
    • G01N2001/366—Moulds; Demoulding
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens

Abstract

The invention relates to the field of experimental equipment for testing the soil mechanical properties of geotechnical engineering subjects, in particular to a spinning coarse-grained soil triaxial experimental sample preparation device and a sample preparation method. A spinning coarse-grained soil triaxial experiment sample preparation device comprises a base, a reaction frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap; the base comprises an upper layer of cylindrical boss, a middle layer of cylindrical boss and a lower layer of cylindrical boss with different diameters, and the reaction frame comprises an annular bottom plate, a rigid reaction column and a reaction cover plate. A sample preparation method using the sample preparation device, comprising: binding a rubber membrane on the base; sleeving the annular bottom plate on the periphery of the upper boss; installing a sample preparation cylinder; preparing soil; filling soil materials layer by layer and compacting; taking out the soil sample. The method can prepare the coarse-grained soil sample used for triaxial compression test in a short time on the premise of not damaging the structural property of coarse-grained soil, has simple structure and convenient use, can accurately control layering and the total density of coarse-grained soil, and is uniform in sample preparation, economical and practical.

Description

Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method
Technical Field
The invention belongs to the field of experimental equipment for testing soil mechanical properties of geotechnical engineering subjects, and particularly relates to a spinning coarse-grained soil triaxial experimental sample preparation device and a sample preparation method.
Background
The coarse-grained soil areas in China are widely distributed, and the number of great projects built on coarse-grained soil foundations is in a situation of rapid increase. The mechanical property test of coarse-grained soil becomes an important content in the civil engineering field at present. When the triaxial mechanical properties of soft soil are measured in a laboratory, the diameter of a sample is usually 5 times or more than the maximum particle diameter, the diameter is usually 200-500mm, the height of the sample is 2-2.5 times the diameter of the sample, for example, a standard cylindrical sample with the diameter of 200mm and the height of 450mm is more common.
In order to obtain the samples with the total density consistent with that of the actual engineering, the laboratory is usually controlled by manual compaction, eye force measurement and the like. However, the method is not easy to operate, the uniformity and compactness requirements of the density of the sample are difficult to control, the coarse-grained soil structure is easy to damage in the compaction process, and the mechanical property result of the sample is affected.
Disclosure of Invention
The invention aims to provide the spinning coarse-grained soil triaxial experiment sample preparation device which is reasonable in structure, economical and practical, and can simply and accurately control the overall density of a sample on the premise of ensuring the uniformity of the sample and not damaging the coarse-grained soil structure.
The invention also aims to provide a sample preparation method which is simple, practical and convenient to operate and utilizes the spinning coarse-grained soil triaxial experiment sample preparation device.
A spinning coarse-grained soil triaxial experiment sample preparation device mainly comprises a base, a reaction frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap;
the base comprises an upper layer of cylindrical boss, a middle layer of cylindrical boss and a lower layer of cylindrical boss with different diameters, the reaction frame comprises an annular bottom plate, a rigid reaction column and a reaction cover plate, the lower end of the rigid reaction column is fixed on the annular bottom plate, a round hole is formed in the reaction cover plate, threads are formed in the upper end of the rigid reaction column, the upper end of the rigid reaction column penetrates through the round hole in the reaction cover plate, the reaction cover plate is fixed at a position by using a nut, and a center screw hole is formed in the middle of the reaction cover plate; the annular bottom plate is provided with a central perforation, is sleeved on an upper boss of the base and is connected with a lower boss of the base through a long rod bolt;
the sample preparation cylinder is a cylindrical body and is formed by combining three circular arc-shaped rigid templates, a convex clamping groove is formed in one side end of each circular arc-shaped rigid template, a matched concave clamping groove is formed in the other side end of each circular arc-shaped rigid template, the three circular arc-shaped rigid templates are combined together in an end-to-end mode to form the cylindrical body, screw clamping pieces are arranged on each circular arc-shaped rigid template through the clamping grooves and are mutually embedded, screw clamping pieces on two adjacent circular arc-shaped rigid templates correspond to each other in position, fastening holes are formed in each screw clamping piece, and the adjacent circular arc-shaped rigid templates are fixed through fastening bolts;
the spinning device comprises a spinning rod, a handle and a push head round cake, wherein the handle is fixed at the upper end of the spinning rod, the push head round cake is fixed at the lower end of the spinning rod, threads are arranged on the spinning rod, the spinning rod penetrates through a central screw hole of the counter force cover plate and is in threaded connection with the counter force cover plate, scale marks are further arranged on the spinning rod, the diameter of the push head round cake is matched with the inner diameter of the sample preparation barrel, and the push head round cake can be inserted from the upper part of the sample preparation barrel and moves up and down;
the rubber membrane is arranged on the periphery of the outer wall of the upper boss of the base, extends upwards, is sleeved on the periphery of the outer wall of the rubber membrane at the periphery of the upper boss, and is close to the inner wall of the sample preparation barrel, the annular bottom plate of the reaction frame is sleeved on the outer wall of the lower part of the sample preparation barrel, in other words, the annular gap between the inner wall of the central perforation of the annular bottom plate and the upper boss is formed, the size of the annular gap is matched with the sum of the thickness of the rubber membrane and the wall thickness of the sample preparation barrel, the inner diameter of the sample preparation barrel is matched with the outer diameter of the rubber membrane sleeved on the periphery of the upper boss, and the outer diameter of the sample preparation barrel is matched with the inner diameter of the annular bottom plate;
the water permeable plate is provided with water permeable holes, is positioned in the sample preparation cylinder and on the upper boss, and the diameter of the water permeable plate is matched with the diameter of the upper boss; the structure of the sample cap comprises a plug top and a plug column, wherein the diameter of the plug column is matched with the inner diameter of the sample preparation barrel, and the plug column can be plugged in from an upper port of the sample preparation barrel.
Preferably, the number of scale marks engraved on the spinning rod is 6, and the position of the highest scale mark is as follows: when the highest scale mark of the rotary pressure rod is overlapped with the upper edge of the central screw hole of the counter force cover plate, the distance from the lower surface of the push head round cake to the top surface of the water permeable plate is equal to 1/6 of the height of the prefabricated soil sample; the position of the lowest graduation mark is as follows: when the lowest scale mark of the rotary pressure rod is overlapped with the upper edge of the central screw hole of the counter force cover plate, the distance from the lower surface of the push head round cake to the top surface of the water permeable plate is equal to the height of the prefabricated soil sample; the positions of the other graduation marks are five bisectors between the highest graduation mark and the lowest graduation mark.
Preferably, the number of the rigid reaction columns is four, the tops of the rigid reaction columns are all provided with threads, the four rigid reaction columns are fixed with the reaction cover plate through nuts, and the reaction cover plate can be fixed on a horizontal plane within the adjustable range of the threads.
Preferably, the three-piece circular arc rigid templates of the sample preparation barrel are combined, wherein the corresponding central angle of each circular arc rigid template is 120 degrees, the outer sides of the joints of the adjacent circular arc rigid templates are provided with screw rods, and the screw rods are arranged at the position of 2/3 of the height of the sample preparation barrel, and the relative positions of the screw rods are fixed by manually tightening the fastening bolts.
Preferably, the rubber membrane has a height greater than the height of the cartridge.
Preferably, the inner diameter of the sample preparation cylinder is 206mm, and the height of the sample preparation cylinder is 550mm; the thickness of the rubber film is 3mm, and the height is 580mm; the length of the rotary pressing rod is 760mm; the thickness of the round push head cake is as follows: 10mm and 200mm in diameter.
The coarse-grained soil prefabricated soil sample is a standard cylinder with the size and the height of 450mm and the diameter of 200mm.
In the concrete implementation, the upper, middle and lower three layers of cylinders of the base are fixedly connected into a whole, and the diameters of the cylinders are sequentially increased from top to bottom to be 200mm, 320mm and 460mm respectively; the round platforms of each layer have the heights of 60mm, 30mm and 50mm respectively. The lower boss surface be equipped with the bolt hole, with the screw position on the annular bottom plate of reaction frame, screw thread phase-match to with stock bolted connection.
6 standard scale marks are engraved on the spinning rod, the distances from the lower surface of the push head round cake to the top surface of the water permeable plate on the boss are respectively controlled to be 1/6, 2/6, 3/6, 4/6, 5/6 and 6/6 of the height of the sample, the length of the spinning rod is 760mm, and the thickness of the round push head round cake is 10mm. In actual manufacturing, the positions of the 6 standard graduation marks can be specifically set according to the length of the spinning rod, the height of the counter-force frame and the thickness of the counter-force cover plate.
The inner diameter of the sample preparation cylinder is 206mm, the thickness of the rubber film is 3mm, the inner diameter of the rubber film is the same as the diameter of a cylindrical standard soil sample to be prepared, and the pushing head round cake is a steel cake with the diameter of 200mm.
The height of the sample preparation cylinder is larger than the sum of the height of a cylindrical standard soil sample to be prepared, the height of an upper boss, the thickness of the water permeable plate and the size of the sample preparation cylinder higher than the standard soil sample, preferably 550mm, the height of the rubber membrane is 580mm, and the rubber mould is outwards turned to the outer side of the top of the sample preparation cylinder beyond the part of the height of the sample preparation cylinder.
A sample preparation method by utilizing the spinning coarse-grained soil triaxial experiment sample preparation device mainly comprises the following operation steps:
(1) The rubber film is sleeved and pricked on the outer wall of the upper boss of the base, so that the bottom of the rubber mold is pulled to the bottom of the upper boss and is tightly attached to the outer wall of the upper boss;
(2) Sleeving an annular bottom plate fixedly connected with four counter-force columns on the periphery of an upper boss of the base, rotationally aligning screw holes of a lower boss of the lower base, and inserting bolts;
(3) The method comprises the steps of installing a sample preparation barrel, namely sequentially placing three circular arc-shaped rigid templates into a gap between the inner side of a central perforation of an annular bottom plate and the outer side of a rubber membrane, fixing the relative positions of the three circular arc-shaped rigid templates, manually inserting a fastening bolt into a fastening hole of a screw card at the outer side of a joint of the sample preparation barrel, and hooping the sample preparation barrel; the top of the rubber membrane is outwards turned over to be higher than the length of the sample preparation cylinder, and the rubber membrane is straightly and tightly attached to the inner wall of the sample preparation cylinder;
(4) Aligning screw holes of the annular bottom plate of the reaction frame and the boss at the lower layer again, and screwing up long rod bolts; the spinning rod passes through a central screw hole of the counter-force cover plate, the counter-force cover plate is fixed on a horizontal plane by a nut, and the spinning rod is rotated to a position where the pushing head cake is higher than the top of the sample preparation cylinder;
(5) Preparing soil: calculating and weighing soil materials required by the test according to the dry density, the water content and the sample size required by the test, and dividing the prepared soil materials into 6 equal parts according to the number of layers required to be filled; the separation of coarse and fine particles is prevented, and the uniformity of the soil is ensured;
(6) Putting a water permeable plate at the bottom of the sample preparation barrel, putting a 1 st layer of coarse-grained soil material into the water permeable plate, brushing the surface, rotating a handle of the rotary pressing rod to compact coarse-grained soil by using a lower push head cake until the highest scale mark on the rotary pressing rod coincides with the upper edge of the central screw hole, and then reversely rotating the handle to drive the push head cake to withdraw from the sample preparation barrel after the soil sample reaches the expected height; filling the 2 nd layer of soil sample by the same method, repeating the operation until the last layer of soil material is filled, and leveling the surface of the soil sample;
(7) The upper part of the soil sample is fastened with the sample cap, the lower part of the soil sample is provided with the water permeable plate, the lower part of the rubber membrane is provided with a plurality of parts, the lower part of the rubber membrane is turned to the lower end of the water permeable plate, and the rubber membrane is fastened;
(8) The sample cylinder can be directly disassembled and prepared for the clay sample; aiming at the non-cohesive coarse-grained soil sample which cannot be erected, pumping air from the top of the soil sample, erecting the soil sample under the negative pressure of 30KPa, and then sequentially disassembling the sample preparation cylinder, the counter-force frame annular bottom plate and the connecting bolts; and after the coarse-grained soil sample preparation is finished, the coarse-grained soil sample is used for triaxial compression test.
The invention provides a spinning coarse-grained soil triaxial experiment sample preparation device, which can prepare coarse-grained soil samples for triaxial compression test in a short time on the premise of not damaging the structural property of coarse-grained soil, has simple equipment structure and convenient use, can accurately control layering and the total density of coarse-grained soil, is uniform in sample preparation, and is economical and practical. The sample preparation method using the spinning coarse-grained soil triaxial experiment sample preparation device provided by the invention is simple and practical, is convenient to operate, and can be used for preparing soil samples to meet the experiment requirements.
Drawings
Fig. 1 is a schematic structural view of a structural body of the present invention.
FIG. 2 is a schematic view of the structure of the sample cap in the structure of the present invention.
Fig. 3 is a schematic top view of fig. 2.
Fig. 4 is a schematic diagram of a connection relationship disassembly structure of the reaction frame, the spinning device and the base in the structure of fig. 1.
Fig. 5 is a schematic diagram showing a connection relationship between the reaction frame, the base, and the sample cap in the structure of fig. 1.
Fig. 6 is a schematic diagram illustrating a connection and disconnection structure of the spinning device in fig. 1.
FIG. 7 is a schematic diagram of the assembled three-piece cartridge of the present invention.
Fig. 8 is a schematic top view of fig. 7.
Fig. 9 is a partially enlarged schematic structural view of fig. 8.
Fig. 10 is a schematic top view of the annular base plate.
Fig. 11 is a schematic top view of the base.
Fig. 12 is a schematic diagram showing a connection relationship between the reaction frame, the spinning device, the base, and the sample tube in the structure of fig. 1.
FIG. 13 is a schematic diagram of the structure of the sample preparation after the first coarse soil addition according to the present invention.
FIG. 14 is a schematic diagram showing the structure of a sample prepared by adding coarse soil for the sixth time according to the present invention.
The figure shows: 1 is a base, 2 is an annular bottom plate, 3 is a water permeable plate, 4 is a rubber film, 5 is a sample preparation cylinder, 6 is a rigid counter-force column, 7 is a counter-force cover plate, 8 is a round hole, 9 is a center screw hole, 10 is a screw thread, 11 is a handle, 12 is a spinning rod, 13 is a nut, 14 is a push-head round cake, 15 is a center through hole, 16 is a long rod bolt, 17 is a water permeable hole, 18 is a sample cap, 18-1 is a plug top, 18-2 is a plug column, 19 is an upper boss, 20 is a middle boss, 21 is a lower boss, 22 is a convex clamping groove, 23 is a screw card, 24 is a fastening bolt, 25 is an arc-shaped rigid template, 26 is a concave clamping groove, 27 is a fastening hole, 28 is a highest scale mark, 29 is a lowest scale mark, and 30 is a soil sample.
Detailed Description
Example 1:
referring to fig. 1-14, a spinning coarse-grained soil triaxial experimental sample preparation device according to an embodiment of the invention mainly comprises a base 1, a reaction frame, a rubber membrane 4, a sample preparation cylinder 5, a spinning device, a water permeable plate 3 and a sample cap 18;
the base 1 comprises an upper layer boss 19, a middle layer boss 20 and a lower layer boss 21 which are cylindrical bosses with different diameters; the reaction frame comprises an annular bottom plate 2, a rigid reaction column 6 and a reaction cover plate 7, wherein the lower end of the rigid reaction column 6 is fixed on the annular bottom plate 2, a round hole 8 is formed in the reaction cover plate 7, threads are formed in the upper end of the rigid reaction column 6, the upper end of the rigid reaction column 6 penetrates through the round hole 8 in the reaction cover plate 7 and is fixed at a position with the reaction cover plate 7 by using a nut 13, and a central screw hole 9 is formed in the middle of the reaction cover plate 7; the annular bottom plate 2 is provided with a central through hole 15, and the annular bottom plate 2 is sleeved on an upper boss 19 of the base 1 and is connected with a lower boss 21 of the base 1 through a long rod bolt 16.
The sample preparation cylinder 5 is a cylindrical body and is formed by combining three circular arc-shaped rigid templates 25, a convex clamping groove 22 is formed in one side end of each circular arc-shaped rigid template 25, a concave clamping groove 26 which is matched with the circular arc-shaped rigid templates is formed in the other side end of each circular arc-shaped rigid template, the three circular arc-shaped rigid templates 25 are connected end to form the cylindrical body, screw clamping pieces 23 are further arranged on each circular arc-shaped rigid template 25 through the clamping grooves and are mutually embedded, the positions of the screw clamping pieces 23 on two adjacent circular arc-shaped rigid templates 25 are corresponding, a fastening hole 27 is formed in each screw clamping piece 23, and the adjacent circular arc-shaped rigid templates 25 are fixed through fastening bolts 24.
The spinning device comprises a spinning rod 12, a handle 11 and a push head round cake 14, wherein the handle 11 is fixed at the upper end of the spinning rod 12, the push head round cake 14 is fixed at the lower end of the spinning rod 12, threads 10 are arranged on the spinning rod 12, pass through a central screw hole 9 of the counter force cover plate 7 and are in threaded connection with the counter force cover plate 7, scale marks are further arranged on the spinning rod 12, the diameter of the push head round cake 14 is matched with the inner diameter of the sample preparation barrel 5, and the push head round cake 14 can be inserted from the upper part of the sample preparation barrel 5 and move up and down;
the rubber film 4 is arranged on the periphery of the outer wall of the upper boss 19 of the base 1 and extends upwards, the lower part of the sample preparation cylinder 5 is sleeved on the periphery of the outer wall of the rubber film 4 on the periphery of the upper boss 19, the rubber film 4 is close to the inner wall of the sample preparation cylinder 5, and the annular bottom plate 2 of the reaction frame is sleeved on the outer wall of the lower part of the sample preparation cylinder 5; the inner diameter of the sample preparation cylinder 5 is matched with the outer diameter of the rubber membrane 4 sleeved on the periphery of the upper boss 19, and the outer diameter of the sample preparation cylinder 5 is matched with the inner diameter of the annular bottom plate 2.
The water permeable plate 3 is provided with water permeable holes 17 which are positioned in the sample preparation cylinder 5 and on the upper boss 19, and the diameter of the water permeable plate is matched with the diameter of the upper boss 19; the structure of the sample cap 18 comprises a plug top 18-1 and a plug column 18-2, wherein the diameter of the plug column 18-2 is matched with the inner diameter of the sample preparation barrel 5.
The number of graduation marks on the spinning rod 12 is 6, and the position of the highest graduation mark 28 is as follows: when the highest scale mark 28 of the rotary pressure rod 12 is overlapped with the upper edge of the central screw hole 9 of the counter force cover plate 7, the distance from the lower surface of the push head round cake 14 to the top surface of the water permeable plate 3 is equal to 1/6 of the height of the prefabricated soil sample 30; the position of the lowest tick mark 29 is: when the lowest scale mark 29 of the rotary pressure rod 12 is overlapped with the upper edge of the central screw hole 9 of the counter force cover plate 7, the distance from the lower surface of the push head round cake 14 to the top surface of the water permeable plate 3 is equal to the height of the prefabricated soil sample 30; the other graduation is located at the five-bisector between the highest graduation 28 and the lowest graduation 29.
The four rigid reaction columns 6 are arranged, threads are arranged at the tops of the rigid reaction columns 6, the four rigid reaction columns 6 are fixed with the reaction cover plate 7 through nuts 13, and the reaction cover plate 7 can be fixed on a horizontal plane within the adjustable range of the threads.
The three circular arc rigid templates 25 are combined into the sample preparation barrel, wherein the corresponding central angle of each circular arc rigid template 25 is 120 degrees, the joint outer sides of the adjacent circular arc rigid templates 25, and screw clamping pieces 23 are arranged at the position of 2/3 of the height of the sample preparation barrel 5, and the relative positions of the screw clamping pieces 23 are fixed by manually tightening the fastening bolts 24.
The height of the rubber membrane 4 is larger than that of the sample preparation barrel 5.
The inner diameter of the sample preparation cylinder 5 is 206mm, and the height of the sample preparation cylinder 5 is 550mm; the thickness of the rubber film 4 is 3mm, and the height is 580mm; the length of the rotary pressing rod 12 is 760mm; the push head tortilla 14 had a thickness of 10mm and a diameter of 200mm.
Example 2:
referring to fig. 1 to 14, a sample preparation method using the spinning coarse soil triaxial test sample preparation device described in embodiment 1 mainly includes the following operation steps:
(1) The rubber film 4 is sleeved and pricked on the outer wall of the upper boss 19 of the base 1, so that the bottom of the rubber mold 4 is pulled to the bottom of the upper boss 19 and is tightly attached to the outer wall of the upper boss 19;
(2) The annular bottom plate 2 fixedly connected with four rigid counter-force columns 6 is sleeved on the periphery of an upper boss 19 of the base 1, is rotationally aligned with screw holes of a lower boss 21 of a lower base, and is inserted with bolts;
(3) The sample preparation cylinder is installed, namely three circular arc-shaped rigid templates 25 are sequentially placed into a gap between the inner diameter side of the annular bottom plate 2 of the reaction frame and the outer side of the rubber membrane 4, the relative positions of the three circular arc-shaped rigid templates 25 are fixed, and a fastening bolt 24 is manually inserted into a fastening hole 27 of a screw card 23 at the outer side of a joint of the sample preparation cylinder 5 to tighten the sample preparation cylinder 5; the top of the rubber membrane 4 is outwards turned over to the outer side wall of the sample preparation cylinder 5 by a length higher than that of the sample preparation cylinder 5, and the rubber membrane 4 is smoothly and tightly attached to the inner wall of the sample preparation cylinder 5;
(4) Aligning the screw holes of the counter-force frame annular bottom plate 2 and the lower boss 19 again, and screwing up the long rod bolts 16; the rotary pressure rod 12 passes through the central screw hole 9 of the counter force cover plate 7, the counter force cover plate 7 is fixed on a horizontal plane by using a nut 13, and the rotary pressure rod 12 is rotated to a position where the push head round cake 14 is higher than the top of the sample preparation barrel 5;
(5) Preparing soil: calculating and weighing soil materials required by the test according to the dry density, the water content and the sample size required by the test, and dividing the prepared soil materials into 6 equal parts according to the number of layers required to be filled; the separation of coarse and fine particles is prevented, and the uniformity of the soil is ensured;
(6) Placing a water permeable plate 3 at the bottom of the sample preparation barrel 5, loading the 1 st layer of coarse-grained soil material, brushing the flat surface, rotating a handle 11 of a rotary pressing rod 12 to compact coarse-grained soil by a lower push head round cake 14 until the highest scale mark 28 on the rotary pressing rod 12 coincides with the upper edge of a central screw hole 9, and after the soil sample reaches the expected height, reversely rotating the handle 11 to drive the push head round cake 14 to withdraw from the sample preparation barrel 5; filling the 2 nd layer of soil sample by the same method, repeating the operation until the last layer of soil material is filled, and leveling the surface of the soil sample;
(7) The upper part of the soil sample is fastened with a sample cap 18, the lower part of the soil sample is provided with a water permeable plate 3, the lower part of the rubber membrane 4 is overgrown, the lower end of the water permeable plate 3 is turned over, and the rubber membrane 4 is fastened;
(8) The sample cylinder 5 can be directly disassembled for clay samples; aiming at the non-cohesive coarse-grained soil sample which cannot be erected, pumping air from the top of the soil sample, erecting the soil sample under the negative pressure of 30KPa, and then sequentially disassembling the sample preparation cylinder 5, the counter-force frame annular bottom plate 2 and the connecting bolts; and after the coarse-grained soil sample preparation is finished, the coarse-grained soil sample is used for triaxial compression test.

Claims (10)

1. The spinning coarse-grained soil triaxial experiment sample preparation device is characterized by mainly comprising a base, a reaction frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap;
the base comprises an upper layer of cylindrical boss, a middle layer of cylindrical boss and a lower layer of cylindrical boss with different diameters, wherein the diameters of the cylindrical bosses are respectively 200mm, 320mm and 460mm in sequence from top to bottom; the heights of all layers are respectively 60mm, 30mm and 50mm; the reaction frame comprises an annular bottom plate, a rigid reaction column and a reaction cover plate, wherein the lower end of the rigid reaction column is fixed on the annular bottom plate, a round hole is formed in the reaction cover plate, threads are formed in the upper end of the rigid reaction column, the upper end of the rigid reaction column penetrates through the round hole in the reaction cover plate, the reaction cover plate is fixed at a position by using a nut, and a central screw hole is formed in the middle of the reaction cover plate; the annular bottom plate is provided with a central perforation, is sleeved on an upper boss of the base and is connected with a lower boss of the base through a long rod bolt;
the sample preparation cylinder is a cylindrical body and is formed by combining three circular arc-shaped rigid templates, a convex clamping groove is formed in one side end of each circular arc-shaped rigid template, a matched concave clamping groove is formed in the other side end of each circular arc-shaped rigid template, the three circular arc-shaped rigid templates are combined together in an end-to-end mode to form the cylindrical body, screw clamping pieces are arranged on each circular arc-shaped rigid template through the clamping grooves and are mutually embedded, screw clamping pieces on two adjacent circular arc-shaped rigid templates correspond to each other in position, fastening holes are formed in each screw clamping piece, and the adjacent circular arc-shaped rigid templates are fixed through fastening bolts;
the spinning device comprises a spinning rod, a handle and a push head round cake, wherein the handle is fixed at the upper end of the spinning rod, the push head round cake is fixed at the lower end of the spinning rod, threads are arranged on the spinning rod, the spinning rod penetrates through a central screw hole of the counter force cover plate and is in threaded connection with the counter force cover plate, scale marks are further arranged on the spinning rod, the diameter of the push head round cake is matched with the inner diameter of the sample preparation barrel, and the push head round cake can be inserted from the upper part of the sample preparation barrel and moves up and down;
the rubber film is arranged on the periphery of the outer wall of the upper boss of the base, extends upwards, is sleeved on the periphery of the upper boss, and is close to the inner wall of the sample preparation barrel, and the annular bottom plate of the reaction frame is sleeved on the outer wall of the lower part of the sample preparation barrel; the inner diameter of the sample preparation cylinder is matched with the outer diameter of a rubber membrane sleeved on the periphery of the upper boss, and the outer diameter of the sample preparation cylinder is matched with the inner diameter of the annular bottom plate;
the water permeable plate is provided with water permeable holes, is positioned in the sample preparation cylinder and on the upper boss, and the diameter of the water permeable plate is matched with the diameter of the upper boss; the structure of the sample cap comprises a plug top and a plug column, wherein the diameter of the plug column is matched with the inner diameter of the sample preparation barrel, and the plug column can be plugged in from an upper port of the sample preparation barrel.
2. The spinning coarse-grained soil triaxial experiment sample preparation device according to claim 1, wherein the number of scale marks carved on the spinning rod is 6, and the position of the highest scale mark is as follows: when the highest scale mark of the rotary pressure rod is overlapped with the upper edge of the central screw hole of the counter force cover plate, the distance from the lower surface of the push head round cake to the top surface of the water permeable plate is equal to 1/6 of the height of the prefabricated soil sample; the position of the lowest graduation mark is as follows: when the lowest scale mark of the rotary pressure rod is overlapped with the upper edge of the central screw hole of the counter force cover plate, the distance from the lower surface of the push head round cake to the top surface of the water permeable plate is equal to the height of the prefabricated soil sample; the positions of the other graduation marks are five bisectors between the highest graduation mark and the lowest graduation mark.
3. The spinning coarse-grained soil triaxial experiment sample preparation device according to claim 1 or 2, wherein the number of the rigid reaction columns is four, threads are arranged at the tops of the rigid reaction columns, the four rigid reaction columns are fixed with the reaction cover plate through nuts, and the reaction cover plate can be fixed on a horizontal plane within the adjustable range of the threads.
4. The spinning coarse-grained soil triaxial experimental sample preparation device according to claim 1 or 2, wherein three circular arc rigid templates are combined into the sample preparation barrel, wherein the corresponding central angle of each circular arc rigid template is 120 degrees, screw clamping pieces are arranged outside joints of adjacent circular arc rigid templates, and screw clamping pieces are arranged at the position of 2/3 of the height of the sample preparation barrel, and the relative positions of the screw clamping pieces are fixed by manually tightening fastening bolts.
5. The spinning coarse-grained soil triaxial experiment sample preparation device according to claim 3, wherein three circular arc rigid templates are combined into the sample preparation barrel, wherein the corresponding central angle of each circular arc rigid template is 120 degrees, screw clamping pieces are arranged outside joints of adjacent circular arc rigid templates, and screw clamping pieces are arranged at the position of 2/3 of the height of the sample preparation barrel, and the relative positions of the screw clamping pieces are fixed by manually tightening fastening bolts.
6. The spinning coarse-grained soil triaxial experimental sample preparation device according to claim 1 or 2, characterized in that the rubber film has a height greater than the height of the sample preparation cylinder.
7. The spinning coarse-grained soil triaxial experimental sample preparation device according to claim 5, characterized in that the rubber film has a height greater than the height of the sample preparation cylinder.
8. The spinning coarse-grained soil triaxial experimental sample preparation device according to claim 1 or 2, characterized in that the inner diameter of the sample preparation cylinder is 206mm, and the height of the sample preparation cylinder is 550mm; the thickness of the rubber film is 3mm, and the height is 580mm; the length of the rotary pressing rod is 760mm; the thickness of the round push head cake is 10mm, and the diameter is 200mm.
9. The spinning coarse-grained soil triaxial experimental sample preparation device according to claim 7, wherein the inner diameter of the sample preparation cylinder is 206mm, and the height of the sample preparation cylinder is 550mm; the thickness of the rubber film is 3mm, and the height is 580mm; the length of the rotary pressing rod is 760mm; the thickness of the round push head cake is 10mm, and the diameter is 200mm.
10. A sample preparation method using the spinning coarse-grained soil triaxial test sample preparation device according to claim 1 or 2, characterized by mainly comprising the following operation steps:
(1) The rubber film is sleeved and pricked on the outer wall of the upper boss of the base, so that the bottom of the rubber mold is pulled to the bottom of the upper boss and is tightly attached to the outer wall of the upper boss;
(2) Sleeving an annular bottom plate fixedly connected with four counter-force columns on the periphery of an upper boss of the base, rotationally aligning screw holes of a lower boss of the lower base, and inserting bolts;
(3) The method comprises the steps of installing a sample preparation barrel, namely sequentially placing three circular arc-shaped rigid templates into a gap between the inner side of a central perforation of an annular bottom plate and the outer side of a rubber membrane, fixing the relative positions of the three circular arc-shaped rigid templates, manually inserting a fastening bolt into a fastening hole of a screw card at the outer side of a joint of the sample preparation barrel, and hooping the sample preparation barrel; the top of the rubber membrane is outwards turned over to be higher than the length of the sample preparation cylinder, and the rubber membrane is straightly and tightly attached to the inner wall of the sample preparation cylinder;
(4) Aligning screw holes of the annular bottom plate of the reaction frame and the boss at the lower layer again, and screwing up long rod bolts; the spinning rod passes through a central screw hole of the counter-force cover plate, the counter-force cover plate is fixed on a horizontal plane by a nut, and the spinning rod is rotated to a position where the pushing head cake is higher than the top of the sample preparation cylinder;
(5) Preparing soil: calculating and weighing soil materials required by the test according to the dry density, the water content and the sample size required by the test, and dividing the prepared soil materials into 6 equal parts according to the number of layers required to be filled; the separation of coarse and fine particles is prevented, and the uniformity of the soil is ensured;
(6) Putting a water permeable plate at the bottom of the sample preparation barrel, putting a 1 st layer of coarse-grained soil material into the water permeable plate, brushing the surface, rotating a handle of the rotary pressing rod to compact coarse-grained soil by using a lower push head cake until the highest scale mark on the rotary pressing rod coincides with the upper edge of the central screw hole, and then reversely rotating the handle to drive the push head cake to withdraw from the sample preparation barrel after the soil sample reaches the expected height; filling the 2 nd layer of soil sample by the same method, repeating the operation until the last layer of soil material is filled, and leveling the surface of the soil sample;
(7) The upper part of the soil sample is fastened with the sample cap, the lower part of the soil sample is provided with the water permeable plate, the lower part of the rubber membrane is provided with a plurality of parts, the lower part of the rubber membrane is turned to the lower end of the water permeable plate, and the rubber membrane is fastened;
(8) The sample cylinder can be directly disassembled and prepared for the clay sample; aiming at the non-cohesive coarse-grained soil sample which cannot be erected, pumping air from the top of the soil sample, erecting the soil sample under the negative pressure of 30KPa, and then sequentially disassembling the sample preparation cylinder, the counter-force frame annular bottom plate and the connecting bolts; and after the coarse-grained soil sample preparation is finished, the coarse-grained soil sample is used for triaxial compression test.
CN202010033265.7A 2020-01-13 2020-01-13 Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method Active CN111103185B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010033265.7A CN111103185B (en) 2020-01-13 2020-01-13 Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010033265.7A CN111103185B (en) 2020-01-13 2020-01-13 Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method

Publications (2)

Publication Number Publication Date
CN111103185A CN111103185A (en) 2020-05-05
CN111103185B true CN111103185B (en) 2023-11-21

Family

ID=70426546

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010033265.7A Active CN111103185B (en) 2020-01-13 2020-01-13 Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method

Country Status (1)

Country Link
CN (1) CN111103185B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111638111A (en) * 2020-07-20 2020-09-08 安徽理工大学 Experimental method for compacting filler test piece through continuous compression
CN112432809B (en) * 2020-10-30 2023-08-29 浙江坤德创新岩土工程有限公司 Cement soil sampling device and sampling method thereof
CN112924261B (en) * 2021-01-19 2023-09-19 四川省建筑科学研究院有限公司 Hydraulic multi-angle layering triaxial sample preparation device and sample preparation method thereof
CN113125221B (en) * 2021-04-08 2022-10-28 昆明理工大学 Triaxial test sample preparation device and sample preparation method thereof
CN112945735B (en) * 2021-04-12 2024-03-01 昆明理工大学 Layering triaxial experimental tailing material sample loading device
CN113432941B (en) * 2021-05-25 2022-07-05 天津大学 Soil sample membrane loading device for soil-driven triaxial test
CN113670771A (en) * 2021-07-16 2021-11-19 李建军 Variable-pressure vibration maximum dry density measuring device
CN113804523B (en) * 2021-08-26 2024-03-22 西安理工大学 Visual sealing sample preparation device, assembly method and sample preparation method for bulk materials
CN114397155B (en) * 2021-12-16 2023-10-27 中交天津港湾工程研究院有限公司 Preparation method of non-clay unsaturated triaxial sample
CN114397154B (en) * 2021-12-16 2023-09-12 中交天津港湾工程研究院有限公司 Preparation method of triaxial sample of saturated sand
CN114383908B (en) * 2022-01-06 2023-06-20 江苏科技大学 Saturator, triaxial test sample preparation device and sample preparation method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010181232A (en) * 2009-02-04 2010-08-19 Kansai Electric Power Co Inc:The Method of preparing test sample for triaxial test
CN102901660A (en) * 2012-10-16 2013-01-30 绍兴文理学院 Rotary rod type three-shaft sample preparation device and sample preparation method thereof
CN102928267A (en) * 2012-10-16 2013-02-13 绍兴文理学院 Parallel hydraulic type triaxial sample preparation device and sampling method thereof
CN104198254A (en) * 2014-09-18 2014-12-10 华北水利水电大学 Density-controllable geotechnical triaxial sample preparation device
CN104316380A (en) * 2014-11-11 2015-01-28 武汉市市政建设集团有限公司 Sample preparation device for coarse-grained soil triaxial test and application method thereof
US9880081B1 (en) * 2017-03-07 2018-01-30 Ramesh Chandra Gupta Expandable jacket for triaxial, unconfined and uniaxial compression tests and test device for three-dimensional consolidation and settlement tests
CN109060467A (en) * 2018-06-15 2018-12-21 绍兴文理学院 A kind of three axis sample sample preparation device of lift undisturbed soil
CN211740831U (en) * 2020-01-13 2020-10-23 石河子大学 Spinning type coarse-grained soil triaxial experiment sample preparation device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010181232A (en) * 2009-02-04 2010-08-19 Kansai Electric Power Co Inc:The Method of preparing test sample for triaxial test
CN102901660A (en) * 2012-10-16 2013-01-30 绍兴文理学院 Rotary rod type three-shaft sample preparation device and sample preparation method thereof
CN102928267A (en) * 2012-10-16 2013-02-13 绍兴文理学院 Parallel hydraulic type triaxial sample preparation device and sampling method thereof
CN104198254A (en) * 2014-09-18 2014-12-10 华北水利水电大学 Density-controllable geotechnical triaxial sample preparation device
CN104316380A (en) * 2014-11-11 2015-01-28 武汉市市政建设集团有限公司 Sample preparation device for coarse-grained soil triaxial test and application method thereof
US9880081B1 (en) * 2017-03-07 2018-01-30 Ramesh Chandra Gupta Expandable jacket for triaxial, unconfined and uniaxial compression tests and test device for three-dimensional consolidation and settlement tests
CN109060467A (en) * 2018-06-15 2018-12-21 绍兴文理学院 A kind of three axis sample sample preparation device of lift undisturbed soil
CN211740831U (en) * 2020-01-13 2020-10-23 石河子大学 Spinning type coarse-grained soil triaxial experiment sample preparation device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
加快吸力平衡的三轴试验制样方法与验证;谈云志;刘云;刘晓玲;左清军;明华军;;水利学报(第S2期);第37-44页 *

Also Published As

Publication number Publication date
CN111103185A (en) 2020-05-05

Similar Documents

Publication Publication Date Title
CN111103185B (en) Spinning coarse-grained soil triaxial experiment sample preparation device and sample preparation method
CN107101855B (en) Remolded soil layered compaction sample preparation device and method for indoor triaxial test
CN107817146B (en) Dual-compression soil sample preparation device and sample preparation method
CN109959773B (en) Test device and method for reinforcing silt through demoulding microorganism grouting
CN107322763B (en) Permeable concrete compressive strength test piece forming device and forming method
CN111024467B (en) Remolded soil batch sample preparation device and sample preparation method
CN106644763B (en) Earthen site anchoring slurry-matrix interface mechanical property test device and method
CN211740831U (en) Spinning type coarse-grained soil triaxial experiment sample preparation device
CN105064426A (en) Indoor testing device for minitype grouting gravel steel pipe piles and testing method of indoor testing device
CN113155575A (en) Coarse-grained soil triaxial sample preparation device with sample saturation and transfer functions and sample preparation method
CN212301067U (en) Cube geotechnical sample preparation device
CN114964956A (en) Device for preparing triaxial sample by independently executing and compacting program and using method
CN114166601B (en) Bidirectional press-in type triaxial sample preparation device and method based on soil stress history
US11733134B2 (en) Sample preparation mould and sample preparation method for triaxial test of municipal solid waste
CN210690196U (en) Physical similar material test piece mould of variable volume
KR200329959Y1 (en) Compaction Mold for Large Cyclic Triaxial Testing Apparatus
CN210375917U (en) Triaxial remolded sample is preparation facilities fast in batches
CN207564654U (en) A kind of pervious concrete compression strength test molding machine
CN206177682U (en) A forming device for getting test of core sample impervious performance
TWI410628B (en) Method and apparatus for making heavy soil sample
CN210369079U (en) Steel-pipe pile bottom pressure drop effect test device
CN110702487A (en) Rock core preparation facilities for experiments
CN112924261B (en) Hydraulic multi-angle layering triaxial sample preparation device and sample preparation method thereof
CN110006713B (en) Sample preparation device for graded-loading cemented soil direct shear sample
CN217384926U (en) Pouring device for direct shear test of cylindrical rock core with joint surface

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant