CN108760426B - Static pressure method triaxial sample preparation device and method - Google Patents
Static pressure method triaxial sample preparation device and method Download PDFInfo
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- CN108760426B CN108760426B CN201810542414.5A CN201810542414A CN108760426B CN 108760426 B CN108760426 B CN 108760426B CN 201810542414 A CN201810542414 A CN 201810542414A CN 108760426 B CN108760426 B CN 108760426B
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- saturator
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- soil
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- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003068 static effect Effects 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 50
- 238000003825 pressing Methods 0.000 claims abstract description 33
- 230000002706 hydrostatic effect Effects 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005056 compaction Methods 0.000 description 4
- 238000005464 sample preparation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010998 test method Methods 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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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a static pressure method triaxial sample preparation device and a method, the device comprises a saturator, a sample pressing piston, a saturator bottom plate, a mould frame and a cushion block, wherein the mould frame comprises a mould frame base, a mould frame pull rod and a fixing rod for fixedly supporting the saturator bottom plate are arranged on the mould frame base, an upper mould frame ring and a mould frame bottom plate which are respectively assembled with the upper end and the lower end of the saturator in a matching way can be fixed at any height position of the mould frame pull rod, the upper mould frame ring and the mould frame bottom plate are provided with through holes which are equal to the inner diameter of the saturator, and the sample pressing piston is also provided with an annular boss with the diameter larger than the diameter of the upper mould frame ring through hole. According to the invention, the depth of the saturator can be increased or reduced by increasing or reducing the number of the cushion blocks, so that the depth of the saturator is increased equally, and the static pressure of the sample pressing piston provided with the annular boss is used, so that the defects of soil surface inclination and unequal thickness of each layer caused by human factors are overcome, and the uniformity and reliability of the whole sample are improved.
Description
Technical Field
The invention relates to geotechnical test equipment and a geotechnical test method, in particular to a device and a method for preparing a remolded soil triaxial sample.
Background
The existing preparation methods for remolded triaxial samples comprise a consolidation method, a compaction method and a static pressure method, wherein the static pressure method is to put a soil mass with a certain mass into a saturator, put a sample pressing piston after the soil surface is scraped, and etch a control line pressed in layers on the piston, apply static force to press the piston until the scale line of each layer is flush with the upper ring of a mould frame, so that the control of the height of each layer is required to aim at the scale line with naked eyes, the influence of human factors is larger, and the defects of soil surface inclination, different thickness of each layer and the like are easily caused. The invention patent application with the application publication number of CN106610353A discloses a device for preparing triaxial test samples by using a layered compaction method, which comprises a soil sample compactor, a soil sample compaction cylinder and a limit module, wherein the soil sample compaction cylinder is movably fixed in a sample hole on a main body base of the soil sample compactor, and the limit module is movably fixed with a pressing hammer on the soil sample compactor. In addition, the invention patent application with the application publication number of CN104006992A discloses a symmetrical layered sample pressing device and a sample preparation method for preparing a triaxial test sample, wherein the device mainly comprises the following components: the outer walls of the two ends of the soil sample cylinder are sleeved with the clamping grooves of the inner wall of the extension cylinder, and the diameter of the inner wall of the non-clamping groove part of the extension cylinder is equal to that of the inner wall of the soil sample cylinder; the cushion block sleeve comprises an extension cylinder and a soil sample cylinder inner sleeve cushion block sleeve, wherein the cushion block sleeve comprises the following components: the periphery of the back end of the outer cushion block is outwards protruded to form a cover edge, and the center of the front surface of the outer cushion block is provided with a protrusion with threads; the center of the back of the middle cushion block is provided with a threaded hole, the center of the front of the middle cushion block is provided with a protrusion with threads, and the number of the middle cushion blocks is two; the back of the inner cushion block is provided with a threaded hole, and the front of the inner cushion block is flat; the outer cushion block, the middle cushion block and the inner cushion block are in threaded connection with corresponding threaded holes through bulges; the height of the inner cushion block and the middle cushion block is 1/5 of the height of the soil sample cylinder; the sum of the heights of the inner cushion block and the outer cushion block minus the thickness of the cover edge is equal to the height of the non-clamping groove part of the extension cylinder. Although the uniformity of the sample prepared by the outer cushion block, the middle cushion block and the inner cushion block is good, the whole device is too complex and is not suitable for popularization and application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a hydrostatic triaxial sample preparation device and method which are convenient to use and capable of improving sample uniformity and reliability.
The invention relates to a static pressure triaxial sample preparation device, which comprises a mould composed of a cylindrical saturator, a sample pressing piston capable of being matched with the saturator to press samples, a saturator bottom plate, a mould frame capable of being used for fixing the whole mould and a cushion block capable of changing the relative position of the saturator bottom plate and the saturator, wherein the mould frame comprises a mould frame base, a mould frame pull rod and a fixing rod for fixedly supporting the saturator bottom plate are arranged on the mould frame base, an upper mould frame ring and a mould frame bottom plate which are respectively matched and assembled with the upper end and the lower end of the saturator can be fixed at any height position of the mould frame pull rod, the mould frame upper ring and the mould frame bottom plate are provided with through holes equal to the inner diameter of the saturator, the sample pressing piston is also provided with annular bosses with diameters larger than the diameters of the upper mould frame ring through holes, and the upper surface area of the cushion block is larger than the area of the mould frame bottom plate through holes. According to the invention, the relative positions of the saturator and the saturator bottom plate are changed by increasing or decreasing the number of cushion blocks on the fixing rod and between the mold frame bottom plate and the mold frame base, so that the depth of the saturator capable of being filled with soil is controlled. During sample preparation, the weighed soil samples are poured into a saturator in batches by continuously increasing the number of cushion blocks, then static pressure is applied to an annular boss on the sample pressing piston through the sample pressing piston, the annular boss is propped against an upper ring of a die frame, and then the soil samples are pressed, and the samples are manufactured in five layers according to the method. The device can uniformly deepen the depth of the saturator, and the static pressure of the sample pressing piston provided with the annular boss is used for eliminating the defects of soil surface inclination and unequal thickness of each layer caused by human factors, and improving the uniformity and reliability of the whole sample.
Furthermore, according to the hydrostatic triaxial sample preparation device, the cushion block is cuboid, and the U-shaped opening through which the fixing rod on the die frame base and the die frame pull rod can pass is formed in one side of the cushion block, so that the number of the cushion blocks between the die frame base plate and the die frame base is conveniently increased or reduced, and the operation is convenient.
Furthermore, in the hydrostatic triaxial sample preparation device, the cushion block is provided with 4 blocks, and the height of the cushion block is one fifth of the height of the fixing rod.
Furthermore, according to the hydrostatic triaxial sample preparation device, the height of the annular boss, namely the height of the lower sample pressing piston, is the sum of the height of the cushion block and the height of the top of the saturator to the top of the upper ring of the die frame.
Furthermore, according to the hydrostatic triaxial sample preparation device, the upper ring of the die frame and the bottom plate of the die frame can be fixed at any height position on the pull rod of the die frame through bolts.
Further, the static pressure method triaxial sample preparation method of the present invention includes the following steps:
1) According to the compactness and the size of the prepared sample, calculating the mass of the required soil, and equally dividing the soil into five parts;
2) Assembling the upper ring of the die frame, the bottom plate of the die frame and the saturator, tightly attaching the bottom plate of the die frame to the base of the die frame, and screwing bolts to fix the whole device;
3) Weighing the first layer of soil, pouring the first layer of soil into a saturator, brushing a flat soil surface, placing a sample pressing piston, applying static pressure to the sample pressing piston until an annular boss on the sample pressing piston is propped by an upper ring of a die frame, and planing the upper surface of a soil sample after the lamination is completed;
4) Loosening bolts, firstly placing a cushion block below a bottom plate of a die frame, tightly attaching the bottom plate of the die frame to the cushion block, tightening the bolts to fix the whole device, weighing out a second layer of soil, continuously pouring the second layer of soil into a saturator, and finishing the pressing of a second layer of soil sample in the step 3);
5) And (3) sequentially repeating the step (4) for manufacturing the remaining three layers to finally finish the whole preparation process of the soil sample.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the static pressure method triaxial sample preparation device and method, the number of the cushion blocks is increased or reduced on the fixed rod and between the die frame bottom plate and the die frame base to change the relative positions of the saturator and the saturator bottom plate, so that the depth of the saturator which can be filled with soil is controlled, the depth of the saturator is deepened uniformly, the static pressure of the sample pressing piston with the annular boss is used, the defects of soil surface inclination and unequal thickness of each layer caused by human factors are overcome, and the uniformity and reliability of the whole sample are improved.
Drawings
FIG. 1 is a cross-sectional view showing the structure of a sample preparation device according to the present invention.
Fig. 2 is a front view of the press-sample piston of the present invention.
Fig. 3 is a top view of the press-sample piston of the present invention.
Fig. 4 is a front view of a spacer of the present invention.
Fig. 5 is a top view of the spacer of the present invention.
In the figure: 1. the mold frame upper ring, the saturator bottom plate, the mold frame bottom plate, the cushion block, the bolts, the mold frame pull rod, the sample pressing piston, the mold frame base, the fixing rod, the annular boss and the U-shaped opening, wherein the mold frame upper ring, the saturator bottom plate, the mold frame bottom plate, the cushion block, the bolts, the mold frame pull rod, the sample pressing piston, the mold frame base, the fixing rod, the annular boss and the U-shaped opening are arranged in sequence.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
As shown in fig. 1-5, the triaxial sample preparation device by hydrostatic method of the present invention comprises a mold composed of a cylindrical saturator 2, a sample pressing piston 8 capable of matching with the saturator 2 to press samples, and a saturator bottom plate 3, and further comprises a mold frame capable of fixing the whole mold and a cushion block 5 capable of changing the relative position of the saturator bottom plate 3 and the saturator 2, in the preferred embodiment, the saturator 2, the sample pressing piston 8 and the saturator bottom plate 3 are in the loosest fit, the saturator 2 is a cylindrical steel cylinder with the height and diameter selected according to the size of the sample to be prepared, the mold frame comprises a mold frame base 9, a mold frame pull rod 7 and a fixing rod 10 for fixing and supporting the saturator bottom plate 3, the cushion block 5 is a cuboid, one side of the cushion block 5 is provided with a U-shaped opening 12 for the fixing rod 10 and the mold frame pull rod 7 to pass through, and the cushion block 5 is provided with 4 blocks, the height is one fifth of the fixing rod 10, and the upper surface area of the cushion block 5 is larger than the area of the through hole of the mold frame bottom plate 4. The upper die frame ring 1 and the lower die frame bottom plate 4 can be assembled with the upper end and the lower end of the saturator 2 respectively and are fixed at any height position of the die frame pull rod 7 together with the saturator 2, through holes equal to the inner diameter of the saturator 2 are further formed in the upper die frame ring 1 and the lower die frame bottom plate 4, annular bosses 11 with diameters larger than the diameters of the through holes of the upper die frame ring 1 are further formed in the sample pressing pistons 8, and the height of the annular bosses 11 below the sample pressing pistons 8 is the sum of the height of the cushion block 5 and the height of the top of the saturator 2 to the height of the top of the upper die frame ring 1. In the present preferred embodiment, the mold frame upper ring 1 and the mold frame bottom plate 4 are all fixed to the mold frame tie bars 7 by bolts 6.
The method for preparing the sample by using the hydrostatic triaxial sample preparation device comprises the following steps:
1) According to the compactness and the size of the prepared sample, calculating the mass of the required soil, and equally dividing the soil into five parts;
2) Assembling the upper die frame ring 1, the die frame bottom plate 4 and the saturator 2, enabling the die frame bottom plate 4 to cling to the die frame base 9, and tightening the bolts 6 to fix the whole device;
3) Weighing the first layer of soil, pouring the first layer of soil into a saturator 2, brushing the soil surface, placing a sample pressing piston 8, applying static pressure to the sample pressing piston 8 until an annular boss 11 on the sample pressing piston 8 is propped by an upper ring 1 of a die frame, and planing the upper surface of a soil sample after the completion of the lamination;
4) Loosening a bolt 6, firstly placing a cushion block 5 below the bottom plate 4 of the die frame, enabling the bottom plate 4 of the die frame to be clung to the cushion block 5, tightening the bolt 6 to fix the whole device, then weighing out a second layer of soil, continuously pouring the second layer of soil into the saturator 2, and finishing the pressing of the second layer of soil sample in the step 3);
5) And (3) sequentially repeating the step (4) for manufacturing the remaining three layers to finally finish the whole preparation process of the soil sample.
Claims (6)
1. The utility model provides a hydrostatic triaxial sample preparation facilities, includes by cylindric saturator (2), can cooperate the mould that presses appearance piston (8) and saturator bottom plate (3) that presses appearance with saturator (2) constitute, its characterized in that: the preparation device further comprises a die frame capable of fixing the whole die and a cushion block (5) capable of changing the relative positions of the saturator bottom plate (3) and the saturator (2), the die frame comprises a die frame base (9), a die frame pull rod (7) and a fixing rod (10) for fixedly supporting the saturator bottom plate (3) are arranged on the die frame base, the die frame upper ring (1) and the die frame bottom plate (4) which are assembled with the upper end and the lower end of the saturator (2) in a matched mode can be fixed at any height position of the die frame pull rod (7), the die frame upper ring (1) and the die frame bottom plate (4) are provided with through holes equal to the inner diameter of the saturator (2), annular bosses (11) with diameters larger than the diameter of the die frame upper ring (1) through holes are further arranged on the sample pressing piston (8), the upper surface area of the cushion block (5) is larger than the area of the die frame bottom plate (4) through holes, the saturator (2) is a cylinder steel cylinder, and the die frame upper ring (1) and the die frame bottom plate (4) are all fixed on the die frame (7) through bolts (6).
2. The hydrostatic triaxial sample preparation device according to claim 1, wherein the spacer block (5) is a cuboid, and a U-shaped opening (12) through which the fixing rod (10) and the die holder tie rod (7) on the die holder base (9) can pass is formed in one side of the spacer block.
3. The hydrostatic triaxial sample preparation device according to claim 2, wherein the spacer (5) is provided with 4 blocks and has a height of one fifth of the height of the fixing rod (10).
4. A hydrostatic triaxial sample preparation apparatus according to claim 3, characterized in that the height of the annular boss (11) below the sample pressing piston (8) is the sum of the height of the spacer (5) and the height from the top of the saturator (2) to the top of the upper ring (1) of the mould frame.
5. The hydrostatic triaxial sample preparation device according to claim 4, wherein the die holder upper ring (1) and the die holder base plate (4) are fixed to any height position on the die holder tie rod (7) by bolts (6).
6. A method for preparing a sample by a hydrostatic triaxial sample preparation device according to any one of claims 1 to 5, characterised in that the method includes the steps of:
1) According to the compactness and the size of the prepared sample, calculating the mass of the required soil, and equally dividing the soil into five parts;
2) Assembling the upper ring (1) of the die frame, the bottom plate (4) of the die frame and the saturator (2), enabling the bottom plate (4) of the die frame to cling to the base (9) of the die frame, and screwing down the bolts (6) to fix the whole device;
3) Weighing the first layer of soil, pouring the first layer of soil into a saturator (2), brushing the soil surface, placing a sample pressing piston (8), applying static pressure to the sample pressing piston (8) until an annular boss (11) on the sample pressing piston (8) is propped by an upper ring (1) of a die frame, and planing the upper surface of a soil sample after the lamination is completed;
4) Loosening a bolt (6), firstly placing a cushion block (5) below a bottom plate (4) of a die frame, enabling the bottom plate (4) of the die frame to be tightly attached to the cushion block (5), tightening the bolt (6) to fix the whole device, then weighing out the second layer of soil, continuously pouring the second layer of soil into a saturator (2), and finishing the pressing of the second layer of soil sample in the step 3);
5) And (3) sequentially repeating the step (4) for manufacturing the remaining three layers to finally finish the whole preparation process of the soil sample.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810542414.5A CN108760426B (en) | 2018-05-30 | 2018-05-30 | Static pressure method triaxial sample preparation device and method |
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| CN201810542414.5A CN108760426B (en) | 2018-05-30 | 2018-05-30 | Static pressure method triaxial sample preparation device and method |
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| CN108760426A CN108760426A (en) | 2018-11-06 |
| CN108760426B true CN108760426B (en) | 2023-06-02 |
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| CN111999141B (en) * | 2020-08-19 | 2022-05-13 | 安徽伟基基础工程有限公司 | Foundation consolidates geotechnique with pressing appearance device |
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| CN102095618A (en) * | 2010-11-30 | 2011-06-15 | 上海交通大学 | Device for preparing light-weight remoulded soil sample |
| CN103712842A (en) * | 2014-01-09 | 2014-04-09 | 西南交通大学 | Bidirectional layered sample pressing device for preparing consolidation test sample and sample pressing method thereof |
| CN104006992A (en) * | 2014-05-22 | 2014-08-27 | 西南交通大学 | Symmetrical layered sample pressing device for triaxial test sample preparation and sample preparation method |
| CN104266887A (en) * | 2014-09-25 | 2015-01-07 | 中国科学院武汉岩土力学研究所 | Electric static force two-way remoulded soil sample preparation instrument |
| JP2016125962A (en) * | 2015-01-07 | 2016-07-11 | 清水建設株式会社 | Triaxial frost heaving test device and measurement method of three-dimensional freezing expansion characteristic of soil |
| CN107101855A (en) * | 2017-04-26 | 2017-08-29 | 桂林理工大学 | Manipulated soil compaction in layers sample preparation device and its method for indoor triaxial test |
| CN107389408A (en) * | 2017-08-17 | 2017-11-24 | 中国建筑东北设计研究院有限公司 | A kind of triaxial test sample preparation device and method for making sample |
| CN207051076U (en) * | 2017-08-17 | 2018-02-27 | 中国建筑东北设计研究院有限公司 | A kind of triaxial test sample preparation device |
| CN208223922U (en) * | 2018-05-30 | 2018-12-11 | 兰州理工大学 | A kind of three axis sample preparation device of static pressure method |
-
2018
- 2018-05-30 CN CN201810542414.5A patent/CN108760426B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095618A (en) * | 2010-11-30 | 2011-06-15 | 上海交通大学 | Device for preparing light-weight remoulded soil sample |
| CN103712842A (en) * | 2014-01-09 | 2014-04-09 | 西南交通大学 | Bidirectional layered sample pressing device for preparing consolidation test sample and sample pressing method thereof |
| CN104006992A (en) * | 2014-05-22 | 2014-08-27 | 西南交通大学 | Symmetrical layered sample pressing device for triaxial test sample preparation and sample preparation method |
| CN104266887A (en) * | 2014-09-25 | 2015-01-07 | 中国科学院武汉岩土力学研究所 | Electric static force two-way remoulded soil sample preparation instrument |
| JP2016125962A (en) * | 2015-01-07 | 2016-07-11 | 清水建設株式会社 | Triaxial frost heaving test device and measurement method of three-dimensional freezing expansion characteristic of soil |
| CN107101855A (en) * | 2017-04-26 | 2017-08-29 | 桂林理工大学 | Manipulated soil compaction in layers sample preparation device and its method for indoor triaxial test |
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