AU2020103902A4 - An aeration sample preparation equipment and its preparation method - Google Patents
An aeration sample preparation equipment and its preparation method Download PDFInfo
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- AU2020103902A4 AU2020103902A4 AU2020103902A AU2020103902A AU2020103902A4 AU 2020103902 A4 AU2020103902 A4 AU 2020103902A4 AU 2020103902 A AU2020103902 A AU 2020103902A AU 2020103902 A AU2020103902 A AU 2020103902A AU 2020103902 A4 AU2020103902 A4 AU 2020103902A4
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- sample
- top cap
- striation
- triple valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- 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
Abstract
The aeration sample preparation equipment and its preparation method, which includes
the sample top cap of the triaxial instrument, the triple valves with ventilated internal pattern
and the sample base, triple valves with ventilated inner lines and sample base. A latex film is
arranged on the inner wall of the triple valves with ventilation inner lines, and a layer of
preservative film is attached to the outer wall of the triple valves with ventilation inner lines.
The ventilation inner lines of the pressure chamber cylinder are detachably connected to a
vacuum pump, after vacuumizing, the latex film and the inner wall of the triple valves with
ventilation inner lines are completely attached to form a sample preparation chamber; Filter
paper and permeable stone are sequentially placed between the sample top cap and the sample
base and the sample, and the upper and lower ends of the latex film are respectively fixed on
the sample top cap and the sample base; The sample top cap is provided with a plurality of pore
channels, which are all connected to the side channel of a communicable sealing plug; There
are two L-shaped pore channels in the sample base, and the outlet of the pore channel on the
side wall is connected with the communicable sealing plug and the ball valve respectively. The
method can be well applied in preparing sand soil remolded samples with specified size and
relative density, and it has obvious advantages especially for preparing sandy soil samples in
loose state.
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Description
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Figure1I
An aeration sample preparation equipment and its preparation method
The invention relates to aeration sample preparation equipment and its preparation
method, and belongs to the field of civil engineering geotechnical tests.
The triaxial instrument is the most commonly used instrument for studying the
mechanical properties of sandy soils in existing geotechnical tests, which is capable of
reflecting the actual mechanical properties of soils under various conditions. The
preparation of sandy soil specimens in the triaxial test is done by using traditional foliate
molds or membrane cartridges mounted on pressure chambers.
However, the sandy soil samples prepared by the above-mentioned traditional sand
preparation devices and methods, especially when the sandy soil is loose sand, silt, sand
powder, fine powdered sand, gravel, etc., often require additional treatment or correction
to ensure the consistency of the radial dimensions of the sample preparation (especially the
loose and compacted state of the non-clay soil samples) and to ensure the uniformity of the
force applied to the sample during the test.
The existing conventional sample preparation method is the sample preparation
method described in Code for Geotechnical Tests (SL237-017-1999), and the specific
process is as follows:
(1) Connectable sealing plugs and ball valves are respectively connected to the pore
channel outlets on both sides of the sample base of GDS circulating triaxial apparatus, and
the valves of the ball valves are closed; The outlet of the pore channel of the side wall of
the sample top cap is connected with a communicable sealing plug; Then placing the
permeable stone on the sample base with filter paper on it.
(2) The latex film is fixed on the sample base through an O-ring; The tri-valve without
ventilation inner thread (the tri-valve produced in the market at present has no ventilation
inner thread, no V-shaped clamping groove, and no channel connecting ventilation inner
thread and outer wall) is directly assembled with the sample base of GDS cyclic triaxial
apparatus.
(3) The conventional three-valve is clamped tightly by the laryngeal cuff, and the part
of the latex film which exceeds the conventional three-valve is everted on the upper part of
the outer wall of the three-valve without ventilation inner lines, and the samples are filled
in the sample preparation chamber.
The disadvantages of the existing methods mentioned above are as follows: the latex
film cannot be completely attached to the conventional three valves, and the standard
cylindrical sample preparation chamber cannot be formed. And no negative pressure is
given, that prepare sample can not reach the size and compact state of the set sample, and
the diameter changes significantly from top to bottom, which make the stress of the sample
uneven and seriously affects the test results.
In order to overcome the above shortcomings in the prior art, the invention provides
a loose sand sample preparation device and method, which can not only ensure the
uniformity of the sample diameter up and down, but also ensure the uniformity of the
sample prepared in a loose state.
The technical scheme adopted by the invention to solve the technical problems is as
follows:
The aeration sample preparation equipment and its preparation method, which
comprises the sample top cap of the triaxial instrument (1), pressure chamber cylinder, the
sample base (4), as they are assembled together from top to bottom; The cylinder of the
pressure chamber is a triple valves with ventilation inner thread, the inner wall of which is
provided with latex film, the outer wall of which is attached with a layer of preservative
film, and the ventilation inner thread of the triple valves with ventilation inner thread is
detachably connected to a vacuum pump, after vacuumizing, the latex film and the triple
valves with ventilation inner thread.
Filter paper and permeable stone are placed between the sample top cap (1) and the
sample base (4) and the sample in turn, and the upper and lower ends of the latex film (10)
are respectively fixed on the sample top cap (1) and the sample base (4) through O-ring I
(13) and O-ring 11 (14).
The sample top cap (1) is provided with a plurality of pore channels (1-2), which are
all connected to a side channel (1-1) of a communicable sealing plug I;
There are two 1-shaped pore passages (4-1) in the sample base (4), and the outlet of the pore passage on the side wall of the sample base (4) is respectively connected with a communicable sealing plugI and a ball valve.
The preparation method of aeration sample, which comprises the following steps:
1) Placing the permeable stone 11 (16) on the sample base (4) with the filter paper II
(15) on it, fixing the emulsion film (10) on the sample base (4) through the O-ring11 (14);
2) Assembling the triple valves with ventilated internal striation (3) with the sample
base (4), spraying water evenly on the outer wall of the triple valves with ventilated internal
striation (3), whose outer wall is pasted a layer of preservative film;
3) Taking hose Clamp (2) to clamp triple valves with ventilated internal striation (3)
to make the three V-shaped bayonets (3-3) fit together;
4) The part of latex membrane (10) extending beyond the triple valves with ventilated
internal striation (3) is valgused to its upper part of the outer wall;
5) Taking Pu air pipe to connect the two quick insert threads;
6) Opening the vacuum pump (9) and extracting the air from the inner wall of triple
valves with ventilated internal striation (3), so that the latex film (10) can completely fit
with the inner wall of the triple valves with ventilated internal striation (3) to form a sample
preparation chamber;
7) The prepared cohesionless soil is uniformly loaded into the sample preparation bin
to form a cylindrical sample;
8) The filter paper I (12) is placed on the upper part of the sample, the permeable stone
I (11) is placed on the filter paper 1 (12), and the top cap (1) of the sample is placed on the permeable stone I (11);
9) Turning the latex film (10) on the upper part of the outer wall of the triple valves
with ventilated internal striation (3) to the outside of the top cap (1) of the sample, and
fixing the upper part of the latex film (10) with the top cap (1) of the sample with O-ring I
(13);
10) Opening the ball valve connected with the sample base (4), and using the ear
washing ball to suck the negative pressure on the ball valve to make the sample be provided
with a certain negative pressure to maintain the dense state of the sample at that time, and
closing the ball valve;
11) Turning off the vacuum pump (9), removing the laryngeal hoop (2), preservative
film and three valves with ventilation inner lines in order to complete the sample
preparation.
Compared with the existing technology, the aeration sample preparation equipment
and its preparation method in this paper can prepare multi-size solid samples, and the
equipment can directly prepare sand soil samples with different sizes and dense states on
various triaxial test platforms, without any other treatment or correction for the samples.
This ensures the consistency of the radial size of the sample preparation (especially the
loose sandy soil sample), so as to ensure the uniform stress of the sample in the test process.
It solves the problem that the aeration sample can not be molded and can not reach the
specified relative density, which improves the preparation technology of indoor triaxial test
sample. Except for the three valves with internal striated ventilation, which need to be
improved and processed according to the sample base size of different test platforms, the rest are common parts in the market, which can be purchased directly, so as to reduce the manufacturing cost of the equipment and facilitate its popularization and application.
The invention will be further explained with reference to drawings and examples.
Fig. 1 is the structural schematic diagram of the example of the present invention.
Fig. 2-1 is the perspective view of a three-valve with ventilated inner veins in the
example of the present invention.
Fig. 2-2 is the cross-sectional view of a three-valve with ventilated inner veins in the
example of the present invention.
Fig. 2-3 is the top view of the triple valves with ventilated internal striation (3) in the
example of the present invention.
Fig. 3-1 is the perspective view of a sample base in the example of the present
invention.
Fig. 3-2 is the sectional view of the sample base in the example of the present
invention.
Fig. 3-3 is the top view of the sample base in the example of the present invention.
Fig. 4-1 is the perspective view of the sample top cap in the example of the present
invention.
Fig. 4-2 is the sectional view of the sample top cap in the example of the present invention.
Fig. 4-3 is the top view of the sample top cap in the example of the present invention.
Components in the figures: 1. Sample top cap; 1-1. Side channel; 1-2. Pore channel;
2. Hose Clamp; 3. Triple valves with ventilated internal striation 3; 3-1. Vertical ventilation
inner line; 3-2. Hole; 3-3. V-type bayonet; 3-4. Radial ventilation inner line; 4. Sample
base; 4-1. L-type pore channel; 5. Quick-insertion thread straight-through I; 6. Connective
sealing plug II; 7. Pu air pipe; 8. Quick thread straight-through II; 9. Vacuum pump ; 10.
Latex membrane; 11. Permeable stone I; 12. Filter paper I; 13. O-ring I; 14. O-ring II; 15.
Filter paper II; 16. Permeable stone II.
In order to make the purpose, technical scheme and advantages of the embodiments
of the present invention clearer, the technical scheme of the embodiments of the present
invention will be described clearly and completely with reference to the drawings in the
embodiments of the present invention. Obviously, the described embodiments are part of
the embodiments of the present invention, not all of them. Based on the embodiments of
the present invention, all other embodiments obtained by ordinary technicians in the field
without creative labor belong to the protection scope of the present invention.
Figs. 1 to Fig. 4 show a structural schematic diagram of a preferred embodiment of
the present invention, and the aeration sample preparation equipment in Fig. 1 comprises
the sample top cap of the triaxial instrument (1), pressure chamber cylinder, the sample
base (4), as they are assembled together from top to bottom; The cylinder of the pressure chamber is a triple valves with ventilation inner thread, the inner wall of which is provided with latex film, the outer wall of which is attached with a layer of preservative film, and the ventilation inner thread of the triple valves with ventilation inner thread is detachably connected to a vacuum pump, after vacuumizing, the latex film and the triple valves with ventilation inner thread.
Filter paper and permeable stone are placed between the sample top cap (1) and the
sample base (4) and the sample in turn, and the upper and lower ends of the latex film (10)
are respectively fixed on the sample top cap (1) and the sample base (4) through O-ring I
(13) and O-ring 11 (14).
The sample top cap (1) is provided with a plurality of pore channels (1-2), which are
all connected to a side channel (1-1) of a communicable sealing plug I;
There are two 1-shaped pore passages (4-1) in the sample base (4), and the outlet of
the pore passage on the side wall of the sample base (4) is respectively connected with a
communicable sealing plugl and a ball valve.
As shown in Fig. 2 to Fig. 4, the preferred and further optimized design scheme of
this embodiment is as follows:
The described the triple valves with ventilated internal striation 3 is composed of three
identical 120° reducer circular valves assembled in a single unit by means of a V-shaped
bayonet 3-3 and tightened by means of a hose Clamp 2. Each trivalve has a concave V
mouth on one side and a convex V-mouth on the other. There arefive radially ventilated
inner patterns 3-4 on the inner wall of the triple valves with ventilated internal striation 3,
wherein each three-valve has a vertical ventilation inner line 3-1, and together with the five radially ventilated inner patterns 3-4, a hole 3-2 in the vertical ventilation inner line 3-1 connects from the inner wall to the outer wall and is used to connect the vacuum pump 9.
The quick-insertion thread straight-through I is connected to the outside of the hole 3-2 in
the side wall of the triple valves with ventilated internal stripes, and the quick thread
straight-through II8 is connected to the vacuum pump 9, and the two straight threads are
connected with the PU tube. The inside diameter of the PU tube is 4mm, and the outside
diameter is 6mm; The inside diameter of the three valve membrane is slightly larger than
the outside diameter of the sample base 4 and the outside diameter of the sample top cap;
The outside diameter of the sample base 4 is the same as the outside diameter of the sample
top cap 1; The permeable stone Il l, filter paper 112, and the sample base 4 is the same as
the outside diameter of the sample top cap 1. The outer diameter is the same as the sample
top cap 1; The inner diameter of the O-ring 113 is slightly smaller than the outer diameter
of the sample top cap 1; The length of the latex membrane 10 is the sum of the length of
the triple valves with ventilated internal striation 3 and the length of the sample top cap 1;
The inner diameter of the latex membrane 10 is the same as the inner diameter of the three
valve membrane with internal grain. Both the coupling type seal plug I and the coupling
type seal plug II consist of a bi-directional outer tooth coupling and an inner tooth sealing
cap.
In order to verify the effectiveness of the sand soil sample preparation equipment in
preparing loose samples, taking Fujian standard sand as an example, the equipment was
used to prepare samples with relative density of 30% on GDS cyclic triaxial apparatus, and
the samples were 50x100mm solid cylindrical samples. The specific process is as follows:
(1) Connective sealing plug II and ball valve were respectively connected to the outlet of pore channel on both sides of sample base 4 of GDS cyclic triaxial instrument, and the ball valve is closed. The connective sealing plug II was connected to the outlet of the pore channel on the side wall of the top cap 1 of the sample. Then placing the permeable stone
1116 on the sample base 4, and putting on the filter paper 1115 on it.
(2) The latex film 10 is fixed on the sample base 4 through the O-ring 11 14. The the
triple valves with ventilated internal striation 3 were assembled with the sample base 4 of
GDS cyclic triaxial apparatus. The water was sprayed evenly on the outer wall of the triple
valves with ventilated internal striation 3, then a layer of plastic film was pasted on the
outer wall of the triple valves with ventilated internal stripes.
(3) The triple valves with ventilated internal striation 3 were tightened with the hose
clamp 2, so that the three V-shaped bayonets 3-3 could fit as much as possible. The part of
latex membrane 10 beyond the three valve 3 with ventilation was turned out on the upper
part of the outer wall of the three valve 3 with ventilation. The quick-insertion thread
straight-through I5 was connected to the outside of the hole 3-2 on the side wall of the
triple valves, and the quick thread straight-through II8 was connected to the vacuum pump
9, and the two quick insert threads were connected through the PU tube.
(4) Opening the vacuum pump 9 and extracting the air from the inner wall of the triple
valves with ventilated internal striation 3, so that the latex film 10 could completely fit with
the inner wall of the three valve 3 with ventilation, so as to form a sample preparation bin
with specified sample size.
(5) The weighed 312g Fujian standard sand was evenly loaded into the sample
preparation warehouse, and the cylindrical Fujian standard sand sample was prepared by wet-impact method. On the upper surface of the sample, filter paper 1 12, permeable stone
I 11 and GDS cyclic triaxial apparatus sample top cap 1 were placed in turn. Turning the
latex film 10 turned out on the upper part of the outer wall of the valve 3 with ventilation
inner lines to the outer side of the sample top cap 1, and fixing the upper part of the latex
film 10 with the sample top cap 1 with O-ring 1 13.
(6) Opening the ball valve communicated with the sample base 4, and using the
aurilave to aim at the ball valve to suck negative pressure, so that there is a certain negative
pressure inside the sample to maintain the dense state of the sample at that time, and closing
the ball valve. Closing the vacuum pump 9, and removing the hose clamp 2, the plastic film
and triple valves with ventilated internal striation 3 in sequence to complete the sample
preparation.
According to the embodiment of the present invention, when the air between the inner
wall of the triple valves with ventilated internal striation 3 and the latex film 10 is pumped
out by the vacuum pump 9, the latex film 10 can be completely attached to the triple valves,
thus forming a standard sample preparation warehouse of 50 x 100 mm. The sample size
prepared by the sand soil sample preparation equipment and method proposed in this
chapter is 49.8x100.2mm, which is basically consistent with the target size, and the actual
sample relative density is 30.1%
In contrast, when adopting the conventional method to prepare the aeration sample,
the upper part of the latex membrane 10 is completely separated from the triple valves,
forming a cone-shaped sample preparation chamber with a small top and a large bottom.
The sample size prepared by the conventional method is 50.4x95.3mm, which is quite
different from the target size, resulting in the actual relative density of the sample being much larger than the target relative density. In addition, the sample diameter changes obviously from top to bottom, and the sample is unevenly stressed under external load.
To sum up, the aeration sample preparation equipment and method of the embodiment
of the invention can prepare sand soil remolded samples with specified size and relative
density, which has obvious advantages in preparing aeration samples in loose state.
The above is only a preferred embodiment of the present invention, and does not limit
the present invention in any form. Any simple modifications and equivalent changes made
to the above embodiments according to the technical essence of the present invention fall
within the protection scope of the present invention.
Claims (11)
1. The aeration sample preparation equipment and its preparation method, which
comprises the sample top cap of the triaxial instrument (1), pressure chamber cylinder, the
sample base (4), while the three are assembled together from top to bottom. It has the
following characterizes:
The cylinder of the pressure chamber is a triple valves with ventilation inner thread,
the inner wall of which is provided with latex film, the outer wall of which is attached with
a layer of preservative film, and the ventilation inner thread of the triple valves with
ventilation inner thread is detachably connected to a vacuum pump, after vacuumizing, the
latex film and the triple valves with ventilation inner thread.
Filter paper and permeable stone are placed between the sample top cap (1) and the
sample base (4) and the sample in turn, and the upper and lower ends of the latex film (10)
are respectively fixed on the sample top cap (1) and the sample base (4) through 0-ring I
(13) and 0-ring 11 (14).
The sample top cap (1) is provided with a plurality of pore channels (1-2), which are
all connected to a side channel (1-1) of a communicable sealing plug I;
There are two 1-shaped pore passages (4-1) in the sample base (4), and the outlet of
the pore passage on the side wall of the sample base (4) is respectively connected with a
communicable sealing plugl and a ball valve.
2. The aeration sample preparation equipment and its preparation method according
to claim 1, which is characterized in that the ventilated triple valves (3) with internal striae
is assembled into a whole by three identical 120° variable-diameter annular petals by a V- shaped bayonet (3-3), and is clamped by a laryngeal hoop (2).
3. The aeration sample preparation equipment and its preparation method according
to claim 1 or claim 2, which is characterized in that the inner wall of the triple valves with
ventilated internal striation (3) has five radial ventilated internal striation (3-4), each of
which has one vertical ventilated internal striation (3-1), together with five radial
ventilation lines (3-4). There is a hole (3-2) in the vertical ventilated internal striation (3-1)
that communicates from the inner wall to the outer wall for connecting the vacuum pump
(9).
4. The aeration sample preparation equipment and its preparation method according
to claim 3, which is characterized in that The triple valves with ventilated internal striation
(3) and the vacuum pump (9) are both provided with quick-insertion thread straight-through
(5). The quick-insertion thread straight-through 1(5) is connected to the outside of the hole
(3-2) on the side wall of triple valves with ventilated internal striation (3), and the quick
insertion thread straight-through 11(8) is connected to the vacuum pump (9), and the two
quick-insertion threads are directly connected by PU pipe.
5. The aeration sample preparation equipment and its preparation method according
to claim 4, which is characterized in that the specifications of quick-insertion thread
straight-through of triple valves with ventilated internal striation (3) and the vacuum pump
(9) are all PC6-01, and the sizes are consistent with the market standard sizes; The inner
diameter of PU air tube is 4mm and the outer diameter is 6 mm.
6. The aeration sample preparation equipment and its preparation method according
to claim 1 or claim 2, which is characterized in that the inner diameter of the triple valves with ventilated internal striation (3) is slightly larger than the outer diameter of the upper part of the sample base (4) as well as the outer diameter of the sample top cap (1). The upper outer diameter of the sample base (4) is consistent with the outer diameter of the sample top cap (1); The outer diameters of permeable stone I (11) and filter paper 1 (12) are consistent with the sample top cap (1). The inner diameter of the O-ring I (13) is slightly smaller than the outer diameter of the sample top cap (1); The length of that latex film (10) is the sum of the length of the three valve with inner grain and the length of the sample top cap (1); The inn diameter of that latex film (10) is consistent with that of the triple valves with ventilated internal striation (3).
7. The aeration sample preparation equipment and its preparation method according
to claim 1 or claim 2, which is characterized in that the communicable sealing plugs on the
sample top cap (1) and the sample base (4) are composed of bidirectional external teeth
communication and internal teeth sealing cover.
8. The aeration sample preparation equipment and its preparation method according
to any one of claim 1 to claim 7, which is characterized in the following steps:
1) Placing the permeable stone 11 (16) on the sample base (4) with the filter paper II
(15) on it, fixing the emulsion film (10) on the sample base (4) through the O-ring11 (14);
2) Assembling the triple valves with ventilated internal striation (3) with the sample
base (4), spraying water evenly on the outer wall of the triple valves with ventilated internal
striation (3), whose outer wall is pasted a layer of preservative film;
3) Taking hose Clamp (2) to clamp the three valves (3) with internal striation to make
the three V-shaped bayonets (3-3) fit together;
4) The part of latex membrane (10) extending beyond the triple valves with ventilated
internal striation (3) is valgused to its upper part of the outer wall;
5) Taking Pu air pipe to connect the two quick insert threads;
6) Opening the vacuum pump (9) and extracting the air from the inner wall of triple
valves with ventilated internal striation (3), so that the latex film (10) can completely fit
with the inner wall of the three valves (3) with ventilation inner striation to form a sample
preparation chamber;
7) The prepared cohesionless soil is uniformly loaded into the sample preparation bin
to form a cylindrical sample;
8) The filter paper I (12) is placed on the upper part of the sample, the permeable stone
I (11) is placed on the filter paper 1 (12), and the top cap (1) of the sample is placed on the
permeable stone I (11);
9) Turning the latex film (10) on the upper part of the outer wall of the triple valves
with ventilated internal striation (3) to the outside of the top cap (1) of the sample, and
fixing the upper part of the latex film (10) with the top cap (1) of the sample with O-ring I
(13);
10) Opening the ball valve connected with the sample base (4), and using the ear
washing ball to suck the negative pressure on the ball valve to make the sample be provided
with a certain negative pressure to maintain the dense state of the sample at that time, and
closing the ball valve;
11) Turning off the vacuum pump (9), removing the laryngeal hoop (2), preservative film and three valves with ventilation inner lines in order to complete the sample preparation.
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Figure 1
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Figure 2-1
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Figure 2-2
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Figure 2-3
Figure 3-1
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Figure 3-2
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Figure 3-3
Figure 4-1
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Figure 4-2
Figure 4-3
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| AU2020103902A AU2020103902A4 (en) | 2020-12-04 | 2020-12-04 | An aeration sample preparation equipment and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804523A (en) * | 2021-08-26 | 2021-12-17 | 西安理工大学 | Visual sealed sample preparation device, assembly method and sample preparation method for discrete materials |
| CN113848106A (en) * | 2021-09-14 | 2021-12-28 | 天津大学 | Preparation device and method suitable for loose saturated sand sample in geotechnical triaxial shear test |
| CN114397155A (en) * | 2021-12-16 | 2022-04-26 | 中交天津港湾工程研究院有限公司 | Preparation method of unsaturated triaxial sample without cohesive soil |
-
2020
- 2020-12-04 AU AU2020103902A patent/AU2020103902A4/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804523A (en) * | 2021-08-26 | 2021-12-17 | 西安理工大学 | Visual sealed sample preparation device, assembly method and sample preparation method for discrete materials |
| 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 |
| CN113848106A (en) * | 2021-09-14 | 2021-12-28 | 天津大学 | Preparation device and method suitable for loose saturated sand sample in geotechnical triaxial shear test |
| CN113848106B (en) * | 2021-09-14 | 2022-12-20 | 天津大学 | Preparation device and method suitable for loose saturated sand sample in geotechnical triaxial shear test |
| CN114397155A (en) * | 2021-12-16 | 2022-04-26 | 中交天津港湾工程研究院有限公司 | Preparation method of unsaturated triaxial sample without cohesive soil |
| 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 |
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