CN114062072A - A hollow cylinder remolded appearance is hit real ware for saturation - Google Patents
A hollow cylinder remolded appearance is hit real ware for saturation Download PDFInfo
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- CN114062072A CN114062072A CN202111199129.6A CN202111199129A CN114062072A CN 114062072 A CN114062072 A CN 114062072A CN 202111199129 A CN202111199129 A CN 202111199129A CN 114062072 A CN114062072 A CN 114062072A
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- 238000005056 compaction Methods 0.000 claims abstract description 100
- 239000002689 soil Substances 0.000 claims abstract description 38
- 238000007634 remodeling Methods 0.000 claims abstract description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- 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
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A hollow cylinder remodeling sample compacting device for saturation comprises a mold, a saturation device and a compacting device. The die comprises a base (1), a fixed rod (2), an inner die (5) and an outer die (3); the inner die and the outer die are both arranged on the base and are fixed by a compaction top cover (7) and a butterfly nut (8); an inner extension cylinder is arranged on the inner die, and an outer extension cylinder (4) is arranged on the outer die; a soil sample is placed in the space between the inner die and the outer die; the compaction device is arranged above the mould, and the compaction (12) is guided by a compaction hammer guide rod (11) and falls down to strike the leveling ring (10) to compact the soil sample. The compaction device is simple and convenient to use and easy to operate, greatly saves the preparation time of remolded soil samples compared with the traditional sample preparation, and provides convenience for sample saturation; the method has the advantages that a good effect is achieved on preparing the uniform and standard remolded soil sample, and great help is provided for remolded sample test of the hollow cylinder torsional shear apparatus.
Description
Technical Field
The invention relates to a hollow cylinder remodeling sample compactor for saturation, and belongs to the technical field of geotechnical tests.
Background
At present, two main methods for preparing a remolded soil sample indoors are as follows: a layered compaction method and a slurry pressurizing consolidation method. However, the equipment required by slurry pressurization and consolidation is heavy, the time for preparing the sample is relatively long, and the progress of related tests is seriously influenced, so that the conventional method for preparing the remolded soil sample is a layering compaction method.
The Zhejiang university jointly developed the hollow torsional shear apparatus with GDS company, and the sample that the experiment was used is the hollow cylinder shape of height 200mm, external diameter 100mm, internal diameter 60mm, but GDS company only provided a plastics vibrating rod as remoulding the layering compaction instrument of appearance, and did not provide the mould of preparation sample, had the following problem during the system appearance: firstly, layered hitting is difficult to control the thickness of each layer in real time; the compactness of each layer and the flatness of each layer surface are difficult to control; thirdly, only samples with small relative density can be prepared, and samples with large relative density are difficult to prepare. And fourthly, the sample preparation of the cylindrical drill core is difficult, the inner wall of the test prepared by the drill core is rough, and certain disturbance is generated on the soil sample during the core drilling.
The hollow torsional shear apparatus is the only hollow cylindrical torsional shear apparatus using motor control system in the world, has the features of high test precision, complete functions, no noise and no pollution, and is one advanced geotechnical test apparatus. However, the instruments for manufacturing the hollow torsional shear remolded soil sample provided by the GDS company are deficient in the aspects of compaction of the sample, thickness of the layer and the like, so that the hollow cylindrical remolded soil sample cannot be manufactured well, the accuracy of the test result is deviated, and in addition, because the hollow cylindrical sample is large, the saturation required by the test is difficult to achieve only by means of back pressure saturation of the instrument.
Disclosure of Invention
The invention aims to solve the compaction requirement of a sample required by a hollow torsional shear apparatus, and designs a compaction device for a saturated hollow cylindrical reshaped sample.
The technical scheme of the invention is that the hollow cylinder remodeling sample compacting device for saturation comprises a mould, a saturation device and a compacting device.
The die comprises a base, a fixed rod, an inner die and an outer die; the inner die and the outer die are both arranged on the base and are fixed by a compaction top cover and a butterfly nut; an inner extension cylinder is arranged on the inner die, and an outer extension cylinder is arranged on the outer die; a soil sample is placed in the space between the inner die and the outer die; an annular permeable stone of the saturation device is placed on a base drain hole below the soil sample, and a leveling ring of the compaction device is placed above the soil sample; the compaction device is arranged above the mould, and the compaction hammer falls down to strike the leveling ring on the soil sample, so that the soil sample is compacted.
The outer die is of a cylindrical structure, and the cross section of the outer die is circular; the inner die is of a cylindrical structure, a circular through hole is formed in the center of the inner die, the inner die and the outer die are equal in height, and a cavity between the inner die and the outer die is a soil sample; the structure of the outer extension cylinder is the same as that of the outer mould and is a vertical extension part of the outer mould; the structure of the inner extension cylinder is the same as that of the inner mold and is an extension part of the inner mold in the vertical direction.
The compaction device comprises a leveling ring, a dowel bar, a compaction hammer guide rod, a limiter and a compaction hammer; the leveling ring is placed on the sample; the two same and parallel leveling rings are vertically connected by a plurality of dowel bars which are uniformly distributed on the circumference; two compaction hammer guide rods are vertically arranged at the diameter position of one end plane of the upper leveling ring; the compaction hammer is a cylindrical block with an annular structure, two symmetrical guide holes are arranged on the diameter position of the annular surface of the compaction hammer, the compaction hammer slides on a compaction hammer guide rod through the guide holes to strike the leveling ring, and compaction force is applied to the soil sample through a dowel bar; the upper end of the compaction hammer guide rod is provided with a limiter which limits the height of the compaction hammer.
And two symmetrical lifting rods perpendicular to the end face are mounted on the end face of one side of the compaction hammer, and the connecting line of the two lifting rods penetrates through the center of the compaction hammer and is perpendicular to the connecting line of the centers of the guide holes.
The compaction hammer has a density of 7.8g/cm3The size of the inner diameter and the outer diameter of the circular compaction hammer is consistent with that of the leveling ring.
The saturation device comprises a saturation top cover and an annular permeable stone; the saturated top cap is used when the sample is saturated, and the internal and external extension barrel is disassembled when the soil sample is manufactured, the saturated top cap is placed above the internal and external dies, and is occluded with the grooves in the saturated top cap by utilizing the internal and external dies and then fixed by using the butterfly nut.
The base is of a circular block structure, an annular groove for installing a die is formed in the circular base, and a plurality of drain holes are uniformly formed in the annular groove along the circumferential direction; three fixing rods are vertically arranged on the plane of the base, one fixing rod is arranged in the center of the base and used for installing an inner die, two fixing rods are respectively arranged on two sides of the base and used for installing a compaction top cover, and the three fixing rods are arranged in a straight line; the upper parts of the three fixing rods are provided with threads and matched with butterfly nuts.
The compaction device has the advantages that the compaction device is simple and convenient to use and easy to operate, compared with the traditional sample preparation, the preparation time of the remolded soil sample is greatly saved, and convenience is provided for sample saturation; and a good effect is obtained on preparing an even and standard remolded soil sample, so that great help is provided for remolded sample test of the hollow cylindrical torsional shear apparatus.
Drawings
FIG. 1 is a general structure diagram of a hollow cylindrical sample compacting apparatus;
FIG. 2 is a structural view of a hollow cylindrical sample tamp hammer dowel bar;
FIG. 3 is a plan view of the base and inner and outer molds of the hollow cylindrical sample tamp;
FIG. 4 is a schematic view of a base;
FIG. 5 is a partial schematic view of the apparatus;
FIG. 6 is a schematic view of an annular permeable stone;
FIG. 7 is a schematic view of a tamping pad;
FIG. 8 is a tamping head;
FIG. 9 is a saturation cap;
in the figure: 1 is a base; 2 is a fixed rod; 3 is an outer mold; 4 is an external extension cylinder; 5 is an inner mould; 6 is an inner extension cylinder; 7 is a compaction top cover; 8 is a butterfly nut; 9 is a dowel bar; 10 is a leveling ring; 11 is a compaction hammer guide rod; 12 is a compaction hammer; 13 is a limiter; 14 is a water inlet; 15 is an annular compaction cushion block; 16 is annular permeable stone; and 17 is a saturated top cover.
Detailed Description
The specific embodiment of the invention is particularly applied to a hollow torsional shear apparatus (sample size: height x outer diameter x inner diameter =200mm x 100mm x 60 mm) jointly developed by Zhejiang university and GDS company.
The embodiment of the hollow cylinder remodeling compaction device for saturation comprises a mould, a saturation device and a compaction device, and is shown in figure 1.
The mold of the compaction device of the embodiment comprises a base 1, a fixing rod 2, an outer mold 3, an inner mold 5, an inner extension cylinder 6 and an outer extension cylinder 4. Outer mould 3 and interior mould 5 are all installed on the base 1, and interior mould 5 top is equipped with interior extension section of thick bamboo 6, and outer mould top is equipped with outer extension section of thick bamboo 4. The heights of the inner die and the outer die are equal and are all 200mm, the inner diameter of the outer die is 100mm, the outer diameter of the inner die is 60mm, and a 40mm wide annular cavity is formed between the inner die and the outer die and used for filling a soil sample; the height of the outer extension cylinder 4 and the height of the inner extension cylinder 6 are both 30 mm.
The saturation device of the present embodiment comprises a saturation cap 17 and an annular permeable stone 16.
The compaction device of the embodiment comprises a force transmission column 9, a leveling ring 10, a compaction hammer guide rod 11, a compaction hammer 12 and a limiter 13. The annular surface of the compaction hammer 12 is provided with a through hole vertical to the annular surface and used for a compaction hammer guide rod 11 to pass through; the density of the compaction hammer 12 is 7.8g/cm3The height of the compaction hammer 12 is 65mm, the outer diameter of the compaction hammer 12 is 98mm, and the inner diameter of the compaction hammer 11 is 62 mm; the height of the leveling ring 10 is 10mm, the outer diameter of the leveling ring 10 is 98mm, and the inner diameter of the leveling ring 10 is 62 mm; the length of the compaction hammer guide rod 12 is 200 mm.
The base of the embodiment adopts a concave groove design and is used for placing an inner die and an outer die; the inner die 5 and the outer die 3 are fixed through the three fixing rods 2 and the compaction top cover 7; water inlets 14 are uniformly formed in the circumferential direction of the concave grooves of the base, annular permeable stones 16 are placed above the water inlets 14 when earthwork is saturated, and annular compaction cushion blocks 15 are placed in real time during earthwork compaction.
In the design of the inner and outer extension cylinders of the mold, the mold height is just the height of the sample, so that the last layer of soil sample cannot be loaded into the original mold for compaction at one time when being in a loose state before compaction. The mold needs to be extended before the final layer of soil is loaded. The length of the extension cylinder is 30mm according to the standard that the last layer of soil can be just contained after the die is extended. The extension cylinder is continuously and tightly jointed with the original mould to ensure the integrity of the sample, so the embodiment adopts a concave-convex form to carry out stable occlusion; and the inner and outer extension cylinders are integral circular rings, and can be used for fixing the inner and outer molds of the sample on the premise of being favorable for filling soil. The inner diameter of the outer extension cylinder is consistent with the inner diameter of the original outer die, and the outer diameter of the inner extension cylinder is the same as the outer diameter of the original inner die.
The sample size required for the hollow twist-shear test of this example was 200mm in height, 100mm in outer diameter and 60mm in inner diameter, i.e. 20mm in ring width. Considering that the power of the compaction hammer is reduced due to the contact friction of the leveling ring 10 with the inner wall of the sample outer mold and the outer wall of the sample inner mold during the sample preparation process, the width of the leveling ring needs to be slightly reduced, and the possibility of the contact friction of the leveling ring with the inner wall of the sample outer mold and the outer wall of the sample inner mold is reduced. The outer diameter of the levelling ring 10 is designed to be 98mm and the inner diameter of the levelling ring 10 is designed to be 62 mm.
The compaction hammer 12 of this example had a density of 7.8g/cm3Is made of stainless steel. In order to reduce the contact friction between the compaction hammer 12 and the inner wall of the sample outer die 3 and the outer wall of the sample inner die 5, the inner diameter and the outer diameter of the circular compaction hammer 12 are designed to be consistent with those of a leveling ring, and the height is designed to be 65 mm. The compaction hammer 12 falls along the leveling ring guide rod 11, namely, the gravity potential energy is converted into kinetic energy, the energy is transmitted to the leveling ring 10 through the dowel bar and then transmitted to the sample, the compaction hammer 12 can replace compaction hammers with different masses according to test requirements, and the position of the stopper 13 can be controlled to adjust the falling height of the compaction hammer, so that the compaction work is controlled, and the requirements of different relative compactness of the sample are met.
The operation steps of the compaction device of the embodiment are as follows:
(1) the falling height of the compaction hammer 12 is fixed through the limiter 13, namely the compaction work generated by each compaction hammer 12 falling is fixed, and the total compaction work for sample preparation is converted according to the dry density required by the test, so that the compaction times of each layer of soil sample are calculated;
(2) an inner die 5 and an outer die 3 are installed on a base 1 and fixed by a butterfly nut 8, a sand-rain method is adopted for sample loading, a first part of evenly-divided soil sample is slowly, uniformly and continuously dropped into a circular cavity by using a long-neck funnel, the constant-speed rotation of the long-neck funnel in the circular cavity is constantly kept in the process, and the bottom of the long-neck funnel is always higher than the upper surface of the soil sample;
(3) after a first soil sample is put into a die, a metal bar can be used for tamping, a leveling ring 10 is put into the die, a compaction hammer 12 is sleeved into a leveling ring guide rod 11, the combination of compaction devices is completed, the compaction hammer 12 is raised to a proper height according to the relative compactness required by a test, the compaction hammer 12 falls down along the leveling ring guide rod 12, the compaction times required by each layer are reached, and the compaction of the layer is completed;
(4) and (3) scraping the compacted upper surface to achieve better flatness, compacting the subsequent soil layer, and repeating the process of the first step. Before the last layer of soil sample is filled, the inner extension cylinder 6 and the outer extension cylinder 4 are installed, compaction is carried out, and the inner extension cylinder and the outer extension cylinder are detached after compaction; hollow cylinder samples were successfully prepared.
Claims (6)
1. A hollow cylinder remodeling sample compactor for saturation, the compactor comprising
Comprises a mould, a saturation device and a compaction device;
the die comprises a base, a fixed rod, an inner die and an outer die; the inner die and the outer die are both arranged on the base and are fixed by a compaction top cover and a butterfly nut; an inner extension cylinder is arranged on the inner die, and an outer extension cylinder is arranged on the outer die;
a soil sample is placed in the space between the inner die and the outer die; an annular permeable stone of the saturation device is placed on a base drain hole below the soil sample, and a leveling ring of the compaction device is placed above the soil sample; the compaction device is arranged above the mould, and the compaction hammer falls down to strike the leveling ring on the soil sample so as to compact the soil sample.
2. A hollow cylindrical remodeling-like compactor for saturation according to claim 1, wherein said outer mold is of cylindrical configuration with a circular cross-section; the inner die is of a cylindrical structure, a circular through hole is formed in the center of the inner die, the inner die and the outer die are equal in height, and a cavity between the inner die and the outer die is a soil sample; the structure of the outer extension cylinder is the same as that of the outer mould and is a vertical extension part of the outer mould; the structure of the inner extension cylinder is the same as that of the inner mold and is an extension part of the inner mold in the vertical direction.
3. A hollow cylindrical remodeling-like compaction device for saturation according to claim 1 wherein the compaction means comprises a leveling ring, a dowel, a compaction hammer guide, a stop and a compaction hammer; the leveling ring is placed on the sample; the two same and parallel leveling rings are vertically connected by a plurality of dowel bars which are uniformly distributed on the circumference; two compaction hammer guide rods are vertically arranged at the diameter position of one end plane of the upper leveling ring; the compaction hammer is a cylindrical block with an annular structure, two symmetrical guide holes are arranged on the diameter position of the annular surface of the compaction hammer, the compaction hammer slides on a compaction hammer guide rod through the guide holes to strike the leveling ring, and compaction force is applied to the soil sample through a dowel bar; the upper end of the compaction hammer guide rod is provided with a limiter which limits the height of the compaction hammer.
4. A hollow cylindrical remodeling-like compactor for saturation according to claim 1, wherein said saturation device includes a saturation cap and an annular permeable stone; the saturated top cap is used when the sample is saturated, and the internal and external extension barrel is disassembled when the soil sample is manufactured, the saturated top cap is placed above the internal and external dies, and is occluded with the grooves in the saturated top cap by utilizing the internal and external dies and then fixed by using the butterfly nut.
5. A hollow cylinder remodeling sample compactor for saturation according to claim 1, wherein said base is a circular block structure, a circular groove for installing a mold is provided on the circular base, and a plurality of drainage holes are uniformly provided in the circular groove along the circumferential direction; three fixed rods are vertically arranged on the plane of the base, one fixed rod is arranged in the center of the base, two fixed rods are respectively arranged on two sides of the base, and the three fixed rods are arranged in a straight line; the upper parts of the three fixing rods are provided with threads and matched with butterfly nuts.
6. A hollow cylindrical remodeling-like compaction device for saturation according to claim 3, wherein the compaction hammer is made of a material having a density of 7.8g/cm3The size of the inner diameter and the outer diameter of the circular compaction hammer are consistent with those of the leveling ring; and two symmetrical lifting rods perpendicular to the end face are mounted on the end face of one side of the compaction hammer, and the connecting line of the two lifting rods penetrates through the center of the compaction hammer and is perpendicular to the connecting line of the centers of the guide holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111199129.6A CN114062072A (en) | 2021-10-14 | 2021-10-14 | A hollow cylinder remolded appearance is hit real ware for saturation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111199129.6A CN114062072A (en) | 2021-10-14 | 2021-10-14 | A hollow cylinder remolded appearance is hit real ware for saturation |
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| Publication Number | Publication Date |
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| CN114062072A true CN114062072A (en) | 2022-02-18 |
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| CN202111199129.6A Pending CN114062072A (en) | 2021-10-14 | 2021-10-14 | A hollow cylinder remolded appearance is hit real ware for saturation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115683770A (en) * | 2022-10-18 | 2023-02-03 | 大连理工大学 | Deformation-controllable automatic compaction device for triaxial sample preparation and use method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505184A (en) * | 2017-09-22 | 2017-12-22 | 中国科学院武汉岩土力学研究所 | A kind of geotechnological ring shear test annular soil sample saturator and saturation process |
| CN207866592U (en) * | 2018-01-29 | 2018-09-14 | 华东交通大学 | A kind of mold for making manipulated soil cutting ring sample |
| CN109211692A (en) * | 2018-10-11 | 2019-01-15 | 吉林大学 | A kind of production of hollow cylinder torsional shear sample and saturation integrated device and its application method |
| CN112747982A (en) * | 2020-12-25 | 2021-05-04 | 扬州大学 | Hollow cylinder sample compaction device and compaction method |
-
2021
- 2021-10-14 CN CN202111199129.6A patent/CN114062072A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505184A (en) * | 2017-09-22 | 2017-12-22 | 中国科学院武汉岩土力学研究所 | A kind of geotechnological ring shear test annular soil sample saturator and saturation process |
| CN207866592U (en) * | 2018-01-29 | 2018-09-14 | 华东交通大学 | A kind of mold for making manipulated soil cutting ring sample |
| CN109211692A (en) * | 2018-10-11 | 2019-01-15 | 吉林大学 | A kind of production of hollow cylinder torsional shear sample and saturation integrated device and its application method |
| CN112747982A (en) * | 2020-12-25 | 2021-05-04 | 扬州大学 | Hollow cylinder sample compaction device and compaction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115683770A (en) * | 2022-10-18 | 2023-02-03 | 大连理工大学 | Deformation-controllable automatic compaction device for triaxial sample preparation and use method thereof |
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Application publication date: 20220218 |