CN116558915A - True triaxial experiment remolded soil sample preparation facilities - Google Patents

True triaxial experiment remolded soil sample preparation facilities Download PDF

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Publication number
CN116558915A
CN116558915A CN202310305192.6A CN202310305192A CN116558915A CN 116558915 A CN116558915 A CN 116558915A CN 202310305192 A CN202310305192 A CN 202310305192A CN 116558915 A CN116558915 A CN 116558915A
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CN
China
Prior art keywords
sample preparation
base
true triaxial
soil body
pull rod
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CN202310305192.6A
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Chinese (zh)
Inventor
周宝贵
杨雪强
钟华斌
楚文泽
袁炳祥
蔡池峰
罗程斌
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China Construction Installation Group Southern Construction Co ltd
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China Construction Installation Group Southern Construction Co ltd
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Priority to CN202310305192.6A priority Critical patent/CN116558915A/en
Publication of CN116558915A publication Critical patent/CN116558915A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q

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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)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to the technical field of geotechnical engineering, and particularly provides a true triaxial experiment remolded soil sample preparation device which comprises a base, a soil body sample preparation frame and a top cover, wherein the soil body sample preparation frame is inlaid above the base, the top cover is placed above the soil body sample preparation frame, a pull rod is arranged on the outer side surface of the base, and the base, the soil body sample preparation frame and the top cover are fixedly connected together through movable fit of the pull rod and the top cover. The invention effectively solves the problem that the sample prepared in the prior art is not suitable for lateral stress loading of a true triaxial test, and simultaneously better solves the problem that the sample can better embody different forms when the stress in three directions is loaded, so that the data in loading detection is more accurate, the sample is better attached to the actual engineering, and meanwhile, the experimental data is more true, and the sample can be better ensured to be saturated.

Description

True triaxial experiment remolded soil sample preparation facilities
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a true triaxial experiment remolded soil sample preparation device.
Background
The strength of the soil is an important parameter in geotechnical numerical analysis and in actual engineering construction, and the strength of the soil is generally mainly referred to as its shear strength. In the early stage, the deformation and strength of the soil body are researched through a direct shear apparatus and a lateral limit compression apparatus, and a large error exists; and then, a conventional triaxial test is adopted to simulate the shearing strength under different working conditions, such as different drainage conditions, different confining pressures and the like, so that the precision is greatly improved compared with the prior art, but the conventional triaxial test is an ideal loading condition of various stresses, only the deformation and strength rules of the soil body in the stress symmetry can be reflected, and the conventional triaxial test still has the limitation. Therefore, in order to be more fit with the actual engineering, in order to further discuss the true stress situation of the soil body, in order to simulate different stress situations in all directions, a true triaxial test is generated.
In the prior art, when the middle main stress is not considered, the sample for the triaxial test is generally in a cylinder shape, but the true triaxial test involves loading of lateral stress, so that the sample for the cylinder is not applicable any more.
Disclosure of Invention
The invention provides a true triaxial test remolded soil sample preparation device, which is used for solving the problem that a sample prepared in the prior art is not suitable for lateral stress loading of a true triaxial test, and simultaneously better solving the problem that different forms of the sample can be better reflected when stress is loaded in three directions, so that data in loading detection are more accurate and better attached to actual engineering, and meanwhile, experimental data are more real and the purpose that the sample can be saturated is better ensured.
The invention provides a true triaxial experiment remolded soil sample preparation device, which comprises: base, soil body dress appearance preparation frame and top cap, the top at the base is inlayed to soil body dress appearance preparation frame, the top cap is placed to the top of soil body dress appearance preparation frame, the base lateral surface is provided with the pull rod, pull rod and top cap movable fit are in the same place base, soil body dress appearance preparation frame and top cap fixed connection.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the soil body loading sample preparation frame is two L-shaped plates, and screws are connected with two opposite faces of the two L-shaped plates in a threaded manner.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the upper end face of the base is provided with the clamping placing groove, and the horizontal section of the clamping placing groove is larger than that of the soil body sample preparation frame.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the hollow circle is arranged between the bottom end of the inner side of the clamping placing groove and the lower part of the top cover, and the surface of the hollow circle is provided with the permeable stone.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the area of the permeable stone is larger than that of the hollowed-out circle.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the U-shaped notch is fixedly arranged in the middle of the outer side of the top cover, and the pull rod and the U-shaped notch are mutually matched.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the movable block is fixedly arranged on the outer side surface of the base, the pull rod is rotationally connected in the middle of the movable block, and the pull rod is in threaded connection with the U-shaped notch.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, a plurality of pull rods are correspondingly arranged on the outer wall of the base and the outer wall of the top cover respectively through U-shaped notches.
According to the true triaxial experiment remolded soil sample preparation device provided by the invention, the base, the soil body sample preparation frame and the top cover can be conveniently fixed together, so that the assembly is simple, the soil body sample preparation frame can better prepare an added soil body into a cuboid plastic soil sample, after the addition is finished, permeable stones are placed at the hollowed-out circles of the base and the top cover, the base and the top cover are in threaded connection with the U-shaped notch through the pull rod, the device is further fixed, and the assembled device is subjected to air suction and water immersion operation, so that a qualified experiment sample is prepared.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the embodiments or the drawings needed in the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a true triaxial experiment remolded soil sample preparation device provided by the invention;
fig. 2 is a side sectional view of the true triaxial experimental remolded soil sample preparation device provided by the invention.
Reference numerals:
1. a top cover; 2. a permeable stone; 3. soil body sample loading preparation frame; 4. a screw; 5. a pull rod; 6. a base; 7. a U-shaped notch; 8. hollowed-out circles; 9. the clamping placing groove; 10. a movable block.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The technical solution of the present invention is described below with reference to the embodiment shown in fig. 1:
a true triaxial experiment remolded soil sample preparation device includes: base 6, soil body dress appearance preparation frame 3 and top cap 1, soil body dress appearance preparation frame 3 inlay in the top of base 6, and top cap 1 is placed to the top of soil body dress appearance preparation frame 3, and the base 6 lateral surface is provided with pull rod 5, and pull rod 5 and top cap 1 movable fit are in the same place base 6, soil body dress appearance preparation frame 3 and top cap 1 fixed connection.
It can be understood that the soil body dress appearance preparation frame 3 is inlayed in base 6 top, and the top cap 1 is set up to the top of soil body dress appearance preparation frame 3, links together top cap 1 and base 6 through the pull rod 5 that sets up on the base 6 for whole device is fixed.
In fig. 1, an embodiment of a true triaxial experiment remolded soil sample preparation device is provided, a base 6, a top cover 1 and a soil body sample preparation frame 3 are preferably made of stainless steel materials, wherein the height of the soil body sample preparation frame 3 is preferably 125mm, the length and width of the inner part are preferably 50mm by 50mm, the prepared sample size is preferably 50mm by 125mm rectangular parallelepiped, and a pull rod 5 is preferably a threaded rod.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the soil body sample preparation frame 3 can be better placed through the arranged base 6, so that the placed soil body sample preparation frame 3 is more stable when a soil sample is added, meanwhile, the added soil sample is convenient to knock and fill, the shape of the prepared sample is more complete, the situation of lack of edges and few angles in preparation is reduced, and then after filling is finished, the top cover 1 and the base 6 are fixed together through the cooperation between the arranged pull rod 5 and the push rod, so that the soil body sample preparation frame 3 is more firm, and the sample in the soil body sample preparation frame 3 is convenient to pump and soak, so that the prepared sample is more convenient.
According to the true triaxial experimental remolded soil sample preparation device provided by the embodiment of the invention, as shown in fig. 1, a soil body loading sample preparation frame 3 is formed by two L-shaped plates, and screws 4 are connected with two opposite faces of the two L-shaped plates in a threaded manner.
It can be understood that the soil body sample preparation frame 3 is formed by splicing two L-shaped plates, screws 4 are connected with two vertical surfaces of the L-shaped plates in a threaded manner, gaskets are arranged between the screws 4, and meanwhile the soil body sample preparation frame 3 can be detached freely.
In fig. 1, the size of two "L" shaped plates is the same, and a rectangular structure with a size of 50mm and 125mm is formed by connecting screws 4, wherein the screws 4 are preferably hexagonal screws, and one side of each hexagonal screw penetrating the "L" shaped plate is in threaded connection with the opposite side.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the soil body sample preparation frame 3 is formed by splicing two L-shaped plates, so that the soil body sample preparation frame 3 is more convenient to install, and is better combined with the base 6 through splicing, so that the soil body sample preparation frame is more convenient and better closely attached to the base 6, meanwhile, the soil sample can be better filled when the soil sample is added, the formation of a cavity when the sample is filled is reduced, and the data of the prepared sample is more accurate and more approximate to the actual situation when the sample is filled.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, as shown in fig. 2, the upper end surface of the base 6 is provided with the clamping placing groove 9, and the horizontal section of the clamping placing groove 9 is larger than that of the soil body sample preparation frame 3.
It can be understood that the clamping and placing groove 9 arranged at the upper end of the base 6 is larger than the soil body sample preparation frame 3, and meanwhile, the soil body sample preparation frame 3 is placed in the clamping and placing groove 9.
In fig. 2, an embodiment of a true triaxial experiment remolded soil sample preparation device is provided, the clamping and placing groove 9 is preferably of a concave square structure, and meanwhile, the shape of the clamping and placing groove 9 can be changed according to the shape of the soil body sample preparation frame 3.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the clamping placing groove 9 is arranged above the base 6, so that the soil body sample preparation frame 3 is placed conveniently and better, the soil body sample preparation frame 3 placed in the clamping placing groove 9 is limited and fixed better, the soil body sample preparation frame 3 is prevented from moving when the soil sample is added, the prepared sample is not completely filled, experimental data is inaccurate, the condition of a real construction site cannot be judged accurately, and construction is hindered.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, as shown in fig. 1, a hollowed-out circle 8 is arranged between the bottom end of the inner side of the clamping and placing groove 9 and the lower part of the top cover 1, and the surface of the hollowed-out circle 8 is provided with a permeable stone 2.
It can be understood that the hollow circle 8 is arranged between the bottom of the clamping placing groove 9 above the base 6 and the lower part of the top cover 1, the permeable stone 2 is arranged on the surface of the hollow circle 8, and a layer of filter paper is arranged between the permeable stone 2 and the soil body sample preparation frame 3.
In fig. 1, an embodiment of the device for preparing a true triaxial test remolded soil sample is shown, the permeable stone 2 is preferably in a circular structure, and the permeable stone can also be in other shapes of the adapting clamping placing groove 9, so that the prepared sample plane is smoother, and further the test is convenient.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the water permeable stone 2 is arranged to facilitate water flow to pass through during immersion, air in the sample is conveniently pumped out during air pumping, and meanwhile, the prepared sample plane is more smooth during compaction, so that stress on each surface of the sample is more uniform during experiment, and further, observation and measured data are more accurate.
According to the true triaxial experimental remolded soil sample preparation device provided by the embodiment of the invention, as shown in fig. 1, a U-shaped notch 7 is fixedly arranged in the middle of the outer side of the top cover 1, and the pull rod 5 and the U-shaped notch 7 are mutually matched.
It can be understood that the U-shaped notch 7 is fixedly arranged in the middle of the outer side of the top cover 1, and the pull rod 5 and the U-shaped notch 7 are mutually matched, so that the pull rod 5 is better fixed with the ejector rod, and the overall stability of the device is improved.
In the embodiment of fig. 1, a true triaxial experiment remolded soil sample preparation device is provided, the fixed "U" type notch 7 that sets up in the middle of the top cap 1 lateral wall, the preferred thread groove of "U" type notch 7 mutually support through "U" type notch 7 and pull rod 5 for pull rod 5 is better carries out better fixing with soil body dress appearance preparation frame 3, and then conveniently carries out the preparation of sample, improves the preparation effect.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the whole device is more convenient to connect through the U-shaped notch, meanwhile, the splicing is more convenient, the time required for preparation is further reduced, meanwhile, the prepared sample is more stable in air extraction and water immersion, meanwhile, the sample cannot be damaged, the sample is more complete, and experimental data is more stable.
According to the true triaxial experimental remolded soil sample preparation device provided by the embodiment of the invention, as shown in fig. 1, a plurality of pull rods 5 are correspondingly arranged on the outer wall of a base 6 and a plurality of U-shaped notches 7 are correspondingly arranged on the outer wall of a top cover 1.
It can be understood that the pull rod 5 is provided with a plurality of respectively at the outer wall of base 6 and the top cap 1 outer wall of "U" type notch 7, and pull rod 5 carries out the one-to-one with "U" type notch 7, and then makes things convenient for pull rod 5 and "U" type notch 7 to carry out fixed connection for it is more convenient to connect, and then improves the connection effect of device, makes the device atress more balanced.
In fig. 1, the embodiment of the device for preparing the remolded soil sample in the true triaxial experiment is that the pull rod 5 and the U-shaped notch 7 are in one-to-one correspondence, wherein the number of the pull rod 5 and the U-shaped notch 7 is preferably four, and the middle position of each surface is set, so that after the pull rod 5 and the U-shaped notch 7 are connected, the stress of each part is uniform, and the prepared sample cannot be inclined or uneven in surface.
According to the true triaxial experiment remolded soil sample preparation device provided by the embodiment of the invention, the pull rod 5 and the U-shaped notch 7 are arranged to be connected in sequence, so that the connection is more convenient, the fixing and stress balance of the pull rod 5 when the soil body sample preparation frame 3 is used for preparing the sample is better ensured, the overall stability of the device is further improved, the overall shape of the prepared sample is more regular, the size is more complete, the situation of lack of edges and angles can not occur, the measured experimental data is more accurate, the situation in actual construction engineering is better met, the fitting reality is better, and the data is more true.
The application method of the invention comprises the following steps:
1) Grinding the test soil sample, drying (8 hours), sieving with a target sieve, homogenizing soil, separating samples, adding water to prepare soil with the test target water content, and sealing and preserving overnight.
2) The two L-shaped plates are spliced through the screw 4, so that a complete soil sample preparation frame 3 is formed by combination.
3) The base 6 is placed at a specified position, the soil body sample preparation frame 3 is placed in the clamping placing groove 9 on the base 6, and the permeable stone 2 and the filter paper are placed at the bottom of the clamping placing groove 9 during placement, so that the permeable stone 2 and the filter paper are clamped between the soil body sample preparation frame 3 and the clamping placing groove 9.
4) Taking out the sealed soil body, retesting the water content, and carrying out the next step after reaching the standard, if not, repeating the step 1).
5) According to the soil density required by the true triaxial test, taking a certain amount of soil, pouring soil samples into the soil sample preparation frame 3 for multiple times (3-5 times) and multiple layers, and compacting after adding the soil samples each time. And before the soil sample is added again, shaving must be performed so that the soil body of each layer can be better and more closely contacted, and finally the device is filled.
6) After filling, the upper part of the soil body sample preparation frame 3 is pressed with the permeable stone 2, the filter paper and the top cover 1, and finally the whole device is fixed by the threaded connection of the pull rod 5 and the U-shaped notch 7 on the top cover 1.
7) The whole prepared soil body device is placed in a vacuum pumping cylinder, pumping air for a certain time according to the geotechnical test standard, and then airless water which covers the height water of the whole device is added, and the soil body device is soaked for a time specified by the standard.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The utility model provides a true triaxial experiment remolded soil sample preparation facilities which characterized in that includes: base (6), soil body dress appearance preparation frame (3) and top cap (1), the top at base (6) is inlayed in soil body dress appearance preparation frame (3), top cap (1) are placed to the top of soil body dress appearance preparation frame (3), base (6) lateral surface is provided with pull rod (5), pull rod (5) and top cap (1) movable fit are in the same place base (6), soil body dress appearance preparation frame (3) and top cap (1) fixed connection.
2. The true triaxial experimental remolded soil sample preparation device according to claim 1, wherein the soil body sample preparation frame (3) is two L-shaped plates, and two opposite faces of the two L-shaped plates are in threaded connection with screws (4).
3. The true triaxial experiment remolded soil sample preparation device according to claim 1, characterized in that the upper end face of the base (6) is provided with a clamping placing groove (9), and the horizontal section of the clamping placing groove (9) is larger than the horizontal section of the soil body sample preparation frame (3).
4. The true triaxial experiment remolded soil sample preparation device according to claim 3, wherein a hollowed-out circle (8) is arranged between the bottom end of the inner side of the clamping placing groove (9) and the lower part of the top cover (1), and a permeable stone (2) is arranged on the surface of the hollowed-out circle (8).
5. The true triaxial experimental remolded soil sample preparation device according to claim 4, wherein the area of the permeable stone (2) is larger than the area of the hollowed-out circle (8).
6. The true triaxial experiment remolded soil sample preparation device according to claim 1, wherein a U-shaped notch (7) is fixedly arranged in the middle of the outer side of the top cover (1), and the pull rod (5) and the U-shaped notch (7) are mutually matched.
7. The true triaxial experiment remolded soil sample preparation device according to claim 6, wherein a movable block (10) is fixedly arranged on the outer side surface of the base (6), the pull rod (5) is rotatably connected in the middle of the movable block (10), and the pull rod (5) is in threaded connection with the U-shaped notch (7).
8. The true triaxial experimental remolded soil sample preparation device according to claim 7, characterized in that: the outer wall of the base (6) and the U-shaped notch (7) of the pull rod (5) are respectively and correspondingly arranged on the outer wall of the top cover (1).
CN202310305192.6A 2023-03-20 2023-03-20 True triaxial experiment remolded soil sample preparation facilities Pending CN116558915A (en)

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CN202310305192.6A CN116558915A (en) 2023-03-20 2023-03-20 True triaxial experiment remolded soil sample preparation facilities

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117554149A (en) * 2023-11-16 2024-02-13 北京建筑大学 Glutinous rice slurry and urease combined calcium carbonate reinforced soil sample preparation system and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206583666U (en) * 2017-03-10 2017-10-24 南京宁曦土壤仪器有限公司 Soil sample saturator
CN107727477A (en) * 2017-11-13 2018-02-23 宁波工程学院 A kind of hollow cylinder compacted soil samples saturation device
CN112665958A (en) * 2021-01-18 2021-04-16 郑州大学 Sample preparation device and sample preparation method for preparing sample for geotechnical true triaxial test
WO2022105840A1 (en) * 2021-11-05 2022-05-27 中铁四局集团第四工程有限公司 Test device and method for measuring frictional resistance of thixotropic mud

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206583666U (en) * 2017-03-10 2017-10-24 南京宁曦土壤仪器有限公司 Soil sample saturator
CN107727477A (en) * 2017-11-13 2018-02-23 宁波工程学院 A kind of hollow cylinder compacted soil samples saturation device
CN112665958A (en) * 2021-01-18 2021-04-16 郑州大学 Sample preparation device and sample preparation method for preparing sample for geotechnical true triaxial test
WO2022105840A1 (en) * 2021-11-05 2022-05-27 中铁四局集团第四工程有限公司 Test device and method for measuring frictional resistance of thixotropic mud

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117554149A (en) * 2023-11-16 2024-02-13 北京建筑大学 Glutinous rice slurry and urease combined calcium carbonate reinforced soil sample preparation system and method

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