CN210180783U - A test piece static pressure forming device for geotechnique triaxial compression test - Google Patents
A test piece static pressure forming device for geotechnique triaxial compression test Download PDFInfo
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- CN210180783U CN210180783U CN201920771655.7U CN201920771655U CN210180783U CN 210180783 U CN210180783 U CN 210180783U CN 201920771655 U CN201920771655 U CN 201920771655U CN 210180783 U CN210180783 U CN 210180783U
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Abstract
The utility model relates to a road engineering field especially relates to a test piece static pressure forming device for geotechnique's triaxial compression test. The utility model provides a test piece static pressure forming device, including static pressure forming module and drawing of patterns sampling module, the static pressure forming module includes first biography power piece, sample cylinder and base, drawing of patterns sampling module includes that the second passes the sample of power piece, sample cylinder and holds section and drawing of patterns support. The application provides a test piece static pressure forming device for geotechnical triaxial compression test, towards the fashioned requirement of each size triaxial test piece, utilize devices such as existing press and limited ground material, based on the equipment adjustment of parts such as sample cylinder, holding ring, dowel steel, accurate controllable, convenient efficient preparation shaping each size test piece, guarantee the going on smoothly of triaxial compression test.
Description
Technical Field
The utility model relates to a road engineering field especially relates to a test piece static pressure forming device for geotechnique's triaxial compression test.
Background
In the technical fields of road engineering, geotechnical engineering, hydraulic engineering and the like, the triaxial compression test is one of the most common means for acquiring the performances of a soil body structure, such as stress-strain state, strength characteristic, stress path and the like. The quality of the formed test piece plays an important role in the accuracy and reliability of the test result. The traditional sample preparation method is based on a mould with fixed height and a manual layered compaction method, the procedure is complex, the preparation is inconvenient, the precision of the prepared test piece is not high, and the experimental result is influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcoming of the prior art, the utility model aims to provide a test piece static pressure forming device for geotechnique's triaxial compression test for solve the problem among the prior art.
In order to achieve the above and other related objects, an aspect of the present invention provides a test piece static pressure forming apparatus, including a static pressure forming module and a demolding sampling module, the static pressure forming module includes a first force transferring member, a sample barrel and a base, the sample barrel includes a positioning section and a sample receiving section, the positioning section and the sample receiving section are detachably connected, the base is provided with a sample barrel receiving groove, the first force transferring member includes a first force bearing table and a first force transferring rod, the shape of the first force transferring rod matches with the inner cavity of the sample barrel, the demolding sampling module includes a second force transferring member, a sample receiving section of the sample barrel and a demolding support, the demolding support includes a base, a supporting member and a sample barrel supporting member, the base and the sample barrel supporting member are connected through the supporting member, the sample barrel supporting member is provided with a sample barrel bearing hole, the second force transmission piece comprises a second bearing platform and a second force transmission rod, and the shape of the second force transmission rod is matched with the inner cavity of the sample cylinder.
In some embodiments of the present invention, the connection between each positioning section can be disassembled, including a plurality of positioning sections.
The utility model discloses in some embodiments, the junction of each location section is equipped with the concave ring and the bulge loop of mutually supporting, and the junction that location section and sample hold the section is equipped with the concave ring and the bulge loop of mutually supporting.
The utility model discloses in some embodiments, the top that location section and/or sample held the section is equipped with the outer diameter matched with concave ring with first load platform, and the bottom that the sample held the section is equipped with the inner diameter matched with bulge loop with the sample cylinder holding tank.
In some embodiments of the present invention, the inner cavity of the sample cartridge is cylindrical.
In some embodiments of the present invention, the base and the sample holding section of the sample container are provided with a stopper fitting with each other.
The utility model discloses in some embodiments, be equipped with the gag lever post on the base, the sample of sample section of thick bamboo holds and is equipped with the protruding portion in the section, be equipped with the spacing groove on the protruding portion, gag lever post and spacing groove cooperate.
The utility model discloses in some embodiments, the length of second power transmission rod is greater than the length that the sample held the section.
The utility model discloses another aspect provides a preparation method of test piece, uses test piece static pressure forming device, include:
A) placing the sample containing section on a sample cylinder containing groove of the base;
B) adjusting the total height of the sample cylinder;
C) placing a soil sample in a cavity of the sample accommodating section;
D) extending the first force transmission piece into the sample cylinder, and applying a load on the first bearing platform;
E) taking out the first force transmission piece;
F) and placing the sample containing section on a sample cylinder bearing piece, extending the second force transmission piece into the sample cylinder, and applying load to obtain the test piece.
In some embodiments of the present invention, repeating steps B) through E) to perform static pressure on the multi-layered soil sample.
In some embodiments of the present invention, in the step B), the total height of the sample container is adjusted by providing a positioning section on the sample accommodating section.
The utility model discloses in some embodiments, in step D), the size of load is 3 ~ 5kN, and the time of applying the load is 3 ~ 6 min.
Drawings
Fig. 1 shows the overall structure of the present invention.
Fig. 2 is an enlarged schematic view of the first transmission member of the present invention.
Fig. 3 is a schematic view of the positioning section of the present invention.
Fig. 4 is a schematic view of the sample holding section according to the present invention.
Fig. 5 is a schematic view of the base of the present invention.
Fig. 6 is a schematic view of the mold releasing bracket of the present invention.
Fig. 7 shows the static pressure schematic diagram of the test piece of the present invention.
Fig. 8 shows that the utility model discloses the test piece acquires the sketch map.
Description of the element reference numerals
1 first force-transmitting part
11 first bearing platform
12 first force transmission rod
2 demolding support
21 base
22 support piece
23 sample tube carrier
231 sample tube bearing hole
3 sample cylinder
31 positioning section
311 positioning section inner cavity
312 positioning section convex ring
313 positioning section concave ring
32 sample receiving section
321 sample accommodating section inner cavity
322 sample holds section bulge loop
323 sample accommodating section concave ring
4 base
41 sample tube housing groove
42 stop element
421 gag lever post
422 limit groove
423 fixing piece
5 second force transfer part
51 second bearing platform
52 second dowel
6 soil sample
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 8. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The utility model provides a test piece static pressure forming device, the test piece can be used to geotechnique triaxial compression test, as shown in fig. 1-6, including static pressure shaping module and drawing of patterns sample module, static pressure shaping module includes first biography power piece 1, specimen cylinder 3 and base 4, specimen cylinder 3 includes location section 31 and sample holding section 32, can dismantle the connection between location section 31 and the sample holding section 32, be equipped with specimen cylinder holding tank 41 on the base 4, first biography power piece 1 includes first force bearing platform 11 and first power transmission pole 12, the shape of first power transmission pole 12 cooperatees with specimen cylinder 3's inner chamber, drawing of patterns sample module includes second biography power piece 5, specimen cylinder 3's sample holding section 32 and drawing of patterns support 2, drawing of patterns support 2 includes base 21, support piece 22 and specimen cylinder carrier 23, connects through support piece 22 between base 21 and the specimen cylinder carrier 23, the sample tube bearing part 23 is provided with a sample tube bearing hole 231, the second force transmission part 5 comprises a second bearing platform 51 and a second force transmission rod 52, and the shape of the second force transmission rod 52 is matched with the inner cavity of the sample tube 3. When preparing a test piece for a triaxial compression test for soil engineering, as shown in fig. 7, a static pressure forming module may be formed by the first force transmission member 1, the sample cylinder 3 and the base 4, and then a demoulding sampling module may be formed by the second force transmission member 5, the sample containing section 32 of the sample cylinder 3 and the demoulding support 2. During preparation, the single-layer compaction thickness and the compaction layer number can be determined according to the basic physical properties and the initial state (such as parameters of maximum dry density, initial water content, compaction degree, test piece size and the like required by the test) of the test soil sample. A static pressing step may then be carried out, in particular as follows: calculating and weighing a soil sample with certain mass for single-layer compaction, placing a sample cylinder in a sample cylinder accommodating groove 41 of a base 4, then filling the soil sample 6 into the sample accommodating section 32, inserting and tamping for certain times, slightly leveling the upper surface of the soil sample 6, then selecting/assembling a proper positioning section 31 (the positioning section 31 is not arranged during first compaction) on the sample accommodating section 32 according to the single-layer compaction thickness of the sample, slowly extending a first force transmission rod 12 of a first force transmission piece 1 into a cavity of the sample cylinder 3 until the first force transmission rod is contacted with the soil sample 6, then applying a proper load on a first bearing table 11, controlling a certain speed to slowly compact the soil sample 6 until the bottom of the first bearing table 11 is contacted with the sample cylinder 3, namely the single-layer compaction of the sample reaches a target height, namely the single-layer compaction of the sample reaches the target compaction degree, and controlling the stress to be constant, and stabilizing the pressure for a certain time to balance the stress-strain state in the soil sample 6 of the test piece, then removing the first force transmission piece 1, and roughening the compacted soil sample 6 by using a scraper to make the surface of the test piece rough. After a hydrostatic step is completed, a new positioning segment 31 may be added to the existing cartridge 3 and the hydrostatic step repeated. When the test piece reaches the target height, as shown in fig. 8, the sample cylinder 3 may be removed, the sample cylinder 3 (usually, the sample receiving section 32) is placed on the sample cylinder carrier 23, and is tightly connected to the sample cylinder bearing hole 231, and further, the second force transmission member 5 is used to slowly extend the second force transmission rod 52 into the inner cavity of the sample cylinder 3 to contact with the soil sample 6, and apply a load on the second force bearing table 51, so that the formed test piece may be slowly ejected.
The utility model provides an among the test piece static pressure forming device, as shown in figure 1, fig. 5, can include base 4, the base has certain intensity and rigidity usually to load when can bearing the static pressure. In a preferred embodiment of the present invention, the base 4 is a disc, the height of the base 4 is 20-50 mm, and the diameter is 100-250 mm. The base 4 may be provided with a sample container 41, and the sample container 41 is usually engaged with the sample receiving section 32, so that the sample receiving section 3 can be stably fixed to the base 4 through the sample container 41. The utility model discloses a preferred embodiment, specimen container holding tank 41 is cylindrical, and the bottom that the section 32 was held to the sample can be equipped with the bulge loop with specimen container holding tank 41 matched with, for example, the section bulge loop 322 is held to the sample, and the degree of depth of cell body is the same basically with the bulge distance of bulge loop, and the diameter of cell body slightly is greater than the external diameter of bulge loop, for example, the degree of depth of cell body can be 0.5 ~ 1cm, and the diameter of cell body can be 4 ~ 9cm to when the bulge loop that can hold the bottom of section 32 at the sample stretched into specimen container holding tank 41, realize specimen container holding tank 41 and the stable connection of section 32 is held to the sample.
The utility model provides an among the test piece static pressure forming device, as shown in fig. 4, fig. 5, the sample of base 4 and specimen cylinder 3 holds and is equipped with the locating part 42 of mutually supporting on the section 32 to can guarantee the stable connection between base 4 and the specimen cylinder 3. The utility model discloses an in the preferred embodiment, be equipped with gag lever post 421 on the base, gag lever post 421 can be followed the extending direction of sample section of thick bamboo 3 and extended, can be equipped with the protruding portion on the sample holding section 32 of sample section of thick bamboo 3, can be equipped with spacing groove 422 on the protruding portion, gag lever post 421 and spacing groove 422 cooperate to can imbed gag lever post 421 in spacing groove 422 when fixed, realize the stable connection of base 4 and sample section of thick bamboo 3.
The utility model provides an among the test piece static pressure forming device, as shown in figure 1, sample cylinder 3 can hold section 32 including location section 31 and sample, location section 31 and sample hold and to dismantle the connection between the section 32 to can adjust the length that first power transmission rod 12 stretched into sample cylinder 3 through location section 31, thereby can make length that first power transmission rod 12 stretched into in sample cylinder 3 and the highly matched with of the required static pressure of sample. The positioning section inner cavity 311 of the positioning section 31 and the sample containing section inner cavity 321 of the sample containing section 32 are matched in shape, the extending directions of the positioning section inner cavity and the sample containing section inner cavity are generally consistent, the cross section shapes of the positioning section inner cavity and the sample containing section inner cavity are also generally consistent, and the positioning section inner cavity and the sample containing section inner cavity can be tightly connected, so that the inner cavities of the sample cylinders 3 which are connected in a smooth mode. In a preferred embodiment of the present invention, the joint of the positioning section 31 and the sample accommodating section 32 is provided with a concave ring and a convex ring which are matched with each other, for example, the positioning section convex ring 312 and the sample accommodating section concave ring 323, the diameter of the concave ring is usually slightly larger than that of the convex ring, and when the positioning section 31 and the sample accommodating section 32 are connected, the convex ring structure can be inserted into the concave ring structure and tightly attached to form a stable sample cylinder 3 integral structure. In another preferred embodiment of the present invention, the inner cavity of the sample tube 3 is cylindrical, and the inner cavities of the positioning section 31 and the sample holding section 32 are cylindrical. The sample tube 3 should have a certain strength and rigidity as a whole so as to be able to withstand the load under static pressure. The size of the internal cavity of the sample cylinder 3 can be generally determined according to the specific size of the prepared test piece, for example, the diameter of the internal cavity of the sample accommodating section 32 can be 3-8 cm, the size of the sample accommodating section 32 in the height direction (consistent with the extending direction of the sample cylinder 3) can be 80-160 mm, and the wall thickness of the sample accommodating section 32 can be 6-10 mm; for another example, the diameter of the inner cavity of the positioning section 31 may be 3 to 8cm, the total length dimension of the positioning section 31 in the height direction (which is consistent with the extending direction of the sample cylinder 3) generally depends on the dimension of the single positioning section 31 in the height direction and the number of the positioning sections 31, and the wall thickness of the positioning section 31 may be 6 to 10 mm.
The utility model provides an among the test piece static pressure forming device, as shown in fig. 1, fig. 3, can include a plurality of location sections 31 to can adjust more in a flexible way and stretch into the distance, and can realize the static pressure of multilayer sample. The positioning sections 31 are usually detachably connected with each other, and after the connection, the inner cavity is usually cylindrical and matched with the inner cavity of the sample accommodating section 32, and the extending directions of the positioning sections and the inner cavity are usually consistent. In a preferred embodiment of the present invention, the joint of each positioning segment 31 is provided with a concave ring and a convex ring, which are engaged with each other, for example, the positioning segment convex ring 312 and the positioning segment concave ring 313, the diameter of the concave ring is generally slightly larger than that of the convex ring, and when the adjacent positioning segments 31 are connected, the convex ring structure can be inserted into the concave ring structure and tightly attached, thereby forming a stable sample tube 3 integral structure. In another preferred embodiment of the present invention, the inner cavity of each positioning section 31 is cylindrical, and the height direction (consistent with the extending direction of the sample cylinder 3) of the single positioning section 31 may be 20-40 mm.
The utility model provides an among the test piece static pressure forming device, as shown in fig. 1, fig. 2, first biography power piece 1 can include first load platform 11 and first transfer line 12. The first force-transmitting member 1 is normally of a strength and rigidity to withstand the load applied in static pressure. The outer diameter of the first force transmission rod 12 is usually matched with the diameter of the inner cavity of the sample cylinder 3, so that the first force transmission rod can be tightly attached and can freely slide, the sample is prevented from being left between the first force transmission rod 12 and the sample cylinder 3, and the bottom surface (namely the contact surface with the sample) is usually a plane, so that the sample can be prevented from being deformed. The length of the first force transmission rod 12 is generally larger than the total height of the positioning section 31, but smaller than the height of the sample accommodating section 32, for example, the length of the first force transmission rod 12 may be generally 60-140 mm. In a preferred embodiment of the present invention, the first bearing platform 11 is a circular disc, the height of the first bearing platform 11 is 5-15 mm, and the diameter is 50-100 mm. In another preferred embodiment of the present invention, the top of the positioning section 31 and/or the sample accommodating section 32 is provided with a concave ring matched with the first force bearing platform 11, for example, the positioning section concave ring 313 and the sample accommodating section concave ring 323, the diameter of the concave ring is usually slightly larger than that of the first force bearing platform 11, and when the first force transmission rod 12 extends into the sample cylinder 3 during static pressure, the first force bearing platform 11 can be embedded into the concave ring structure and tightly attached, thereby forming a stable static pressure structure.
The utility model provides an among the test piece static pressure forming device, as shown in fig. 1, fig. 6, drawing of patterns support 2 can include base 21, support piece 22 and specimen tube carrier 23, connects through support piece 22 between base 21 and the specimen tube carrier 23 to can leave certain space between base 21 and specimen tube carrier 23, make the sample can be followed specimen tube carrier hole 231 of specimen tube carrier 23 and ejected. The stripper support 2 is generally of a certain strength and rigidity so as to be able to withstand a certain load. The design of base 21 and sample cylinder carrier 23 is generally determined according to the test piece being prepared, in a preferred embodiment of the present invention, base 21 is a circular disc, height of base 21 is 20-50 mm, diameter is 100-250 mm, sample cylinder carrier 23 is a circular disc, height of sample cylinder carrier 23 is 20-50 mm, diameter is 100-250 mm, support member 22 can be a plurality of support columns in general, support between base 21 and sample cylinder carrier 23 is through a plurality of support columns in general, and the distance between base 21 and sample cylinder carrier 23 can be 30-50 mm. In another preferred embodiment of the present invention, the shape of the sample-receiving hole 231 matches with the lower bottom surface of the sample-receiving section 32, the sample-receiving hole 231 may be a circular hole, the diameter of which may be slightly smaller than the outer diameter of the sample-receiving section 32 and slightly larger than the inner diameter of the sample-receiving section 32, so that the lower edge of the sample-receiving section 32 may be inserted into the hole, for example, the sample-receiving section protruding ring 322 may be inserted into the hole to support the sample-receiving section 32.
The utility model provides an among the test piece static pressure forming device, as shown in FIG. 2, the second passes power piece 5 can include second load platform 51 and second dowel steel 52. The second force-transmitting element 5 is generally of a certain strength and rigidity so as to be able to bear a certain load and push the test piece out of the sample holder 3. The outer diameter of the second dowel bar 52 is usually matched with the diameter of the inner cavity of the sample cylinder 3, so that the second dowel bar can be tightly attached and freely slide, the sample is prevented from being left between the second dowel bar 52 and the sample cylinder 3, and the bottom surface (namely the contact surface with the sample) is usually a plane, so that the sample can be prevented from being deformed. The length of the second dowel 52 may be generally slightly greater than the height of the sample receiving section 32, and may be, for example, 90 to 170 mm. In a preferred embodiment of the present invention, the second bearing platform 51 is a circular disc, the height of the second bearing platform 51 is 5-15 mm, and the diameter is 50-100 mm. In another preferred embodiment of the present invention, the top of the sample receiving section 32 is provided with a concave ring matched with the second bearing platform 51, for example, the concave ring 323 of the sample receiving section, the diameter of the concave ring is usually slightly larger than the diameter of the second bearing platform 51, when the test piece is pushed out, when the second force transfer rod 52 is fully extended into the sample tube 3, the second bearing platform 51 is embedded into the concave ring structure.
The utility model discloses the second aspect provides a preparation method of test piece, uses if the utility model discloses the test piece static pressure forming device that the first aspect provided, include:
A) placing the sample containing section 32 on the sample cylinder containing groove 41 of the base 4;
B) adjusting the total height of the sample cylinder 3;
C) placing a soil sample in the cavity of the sample accommodating section 32;
D) the first force transmission piece 1 extends into the sample cylinder 3, and a load is applied to the first bearing platform 11;
E) taking out the first force transmission piece 1;
F) the sample receiving section 32 is placed on the sample container carrier 23, the second force transmission element 5 is inserted into the sample container 3, and a load is applied to obtain the sample.
The utility model provides an among the preparation method of test piece, can repeat step B) to step E) to carry out the static pressure to the multilayer soil sample. The method of adjusting the overall height of the sample container 3 is mainly achieved by providing the positioning section 31 on the sample receiving section 32, for example, the positioning section 31 may not be provided on the sample receiving section 32, or one or more positioning sections 31 may be provided. In each static pressure process, the soil sample 6 can be filled into the sample containing section 32, the soil sample is inserted and tamped for a certain number of times, the upper surface of the soil sample 6 is slightly leveled, then the total height of the sample cylinder 3 is adjusted according to the single-layer compaction thickness of the sample, a proper positioning section 31 is selected/assembled on the sample containing section 32 (the positioning section 31 is not arranged during the first compaction), the first force transmission rod 12 of the first force transmission piece 1 is slowly extended into the cavity of the sample cylinder 3 to be contacted with the soil sample 6, then a proper load is applied on the first bearing platform 11, a certain speed is controlled to slowly compact the soil sample 6, the bottom of the first bearing platform 11 is contacted with the sample cylinder 3, namely the single-layer compaction of the sample reaches a target height, namely the single-layer compaction of the sample reaches the target compaction degree, the stress is controlled to be constant, the pressure is stabilized for a certain time, and the stress-strain state in the sample soil sample 6 reaches balance, the first force-transmitting member 1 can then be removed and the compacted soil sample 6 roughened with a spatula to roughen the surface of the sample. After a hydrostatic step is completed, a new positioning segment 31 may be added to the existing cartridge 3 and the hydrostatic step repeated.
The utility model provides an among the preparation method of test piece, base 4, specimen cylinder 3, pass between the power piece etc. should closely, smooth nested connection, guarantee that the soil granule can not extrude from the joint gap among static pressure molding or the drawing of patterns process, press load transmits completely to soil sample simultaneously, can scribble emollient such as vaseline on the contact surface when necessary.
The utility model provides an among the preparation method of test piece, the load capacity that applys can generally with the soil sample slow compaction can, for example, in step D), the size of load is 3 ~ 5kN, and the time of applying the load is 3 ~ 6 min.
The utility model discloses the third aspect provides the utility model discloses the test piece static pressure forming device that the first aspect provided with the utility model discloses the preparation method of the test piece that the second aspect provided is in geotechnological test field's usage.
To sum up, this application provides a test piece static pressure forming device for geotechnique's triaxial compression test, towards the fashioned requirement of each size triaxial test piece, utilizes devices such as existing presses and limited ground material, based on the equipment adjustment of parts such as sample cylinder, holding ring, dowel steel, accurate controllable, convenient efficient preparation shaping each size test piece, the going on smoothly of guarantee triaxial compression test.
Example 1
In order to develop a dynamic triaxial test of unsaturated soil and explore the shear strength characteristics of unsaturated soil under different compaction conditions, a plurality of roadbed soil test pieces meeting the test specification and size requirements need to be prepared.
The soil sample required in the experiment is granite residual soil, the initial water content is required to be 5%, and the soil sample is formed after pre-drying, modulating and material sealing according to the requirement. Three soil sample compactibility requirements according to the test: 90%, 95%, 97% and basic physical properties of the soil sample: maximum dry density of 2.2g/cm3Determining the dry density of the soil sample under 3 compactibility as 1.98g/cm3、2.09g/cm3、2.134g/cm3. The soil sample is a cylinder with the diameter of 40mm and the height of 80mm, the soil sample is compacted by four layers, and the total mass of the soil sample under 3 compaction degrees is determined to be 198.95g and 210.00 g respectivelyg. 214.43g, and the compacted mass of the single layer is 49.74g, 52.5g and 53.61 g. The height of the base 4 adopted in the test is 20mm, the diameter is 100mm, the depth of the sample cylinder accommodating groove body is 50mm, and the diameter is 48 mm; the height of the inner cavity of the sample containing section 32 is 80mm, the diameter of the inner cavity is 40mm, and the wall thickness is 6 mm; the height of the inner cavity of the positioning section 31 is 20mm, the diameter of the inner cavity is 40mm, and the wall thickness is 6 mm; the height of the first force transmission rod 12 is 60mm, and the rod diameter is 39 mm; the height of the second dowel 52 is 90mm, and the diameter of the second dowel is 39 mm.
According to the preparation method, the mass of each layer of soil sample is correspondingly weighed according to the target compaction degree; loading a first layer of soil sample into an inner cavity of the sample accommodating section, wherein a base is placed below the first layer of soil sample, and a positioning section is not placed on the sample accommodating section when the first layer of soil sample is compacted; a first force transmission rod extends into the sample accommodating cavity, a press machine is started to apply pressure to the bearing disc, the pressure is increased to 3kN, the pressure is slowly compacted until the bottom of the bearing disc is contacted with the upper part of the sample accommodating section, at the moment, the soil sample reaches the target compaction degree, a pressure head of the press machine is kept still, and the pressure is stabilized for 1 min; raising a press head of the press, and galling the first layer of compacted soil sample top layer; filling a second layer of soil sample into the sample accommodating section, and closely attaching and placing a positioning section on the sample accommodating section; compacting to a target compaction using a first force transfer member; repeating the steps until the four layers of soil samples are completely compacted; the positioning section is detached from the sample containing cavity, the sample containing cavity is arranged on the demoulding support, the second dowel bar extends into the sample containing cavity, and the press machine is started to apply pressure to the bearing disc, so that the sample is slowly extruded; and taking out the sample to carry out subsequent tests.
Use above-mentioned sample to carry out unsaturated soil body dynamic triaxial test (the test method refers to "yellow santing, high water level low embankment saturated silt soil roadbed dynamic triaxial test research [ D ], Guangxi university, 2017" second chapter), after the experiment, take out the sample and pulverize, dry, weigh its quality to check system appearance and experimental precision, the result is shown in following table 1, observe the sample after the preparation shaping simultaneously and do not have the disturbance defect, it is unrestrained to have no soil granule in the process of the test, it is visible the utility model provides a preparation facilities and method are very effective.
TABLE 1
To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The test piece static pressure forming device is characterized by comprising a static pressure forming module and a demoulding sampling module, wherein the static pressure forming module comprises a first force transmission piece (1), a test sample cylinder (3) and a base (4), the test sample cylinder (3) comprises a positioning section (31) and a test sample containing section (32), the positioning section (31) and the test sample containing section (32) are detachably connected, the base (4) is provided with a test sample cylinder containing groove (41), the first force transmission piece (1) comprises a first force bearing platform (11) and a first force transmission rod (12), the shape of the first force transmission rod (12) is matched with the inner cavity of the test sample cylinder (3), the demoulding sampling module comprises a second force transmission piece (5), the test sample containing section (32) of the test sample cylinder (3) and a demoulding support (2), and the demoulding support (2) comprises a base (21), a support piece (22) and a test sample cylinder bearing piece (23), the base (21) is connected with the sample cylinder bearing piece (23) through a supporting piece (22), a sample cylinder bearing hole (231) is formed in the sample cylinder bearing piece (23), the second force transmission piece (5) comprises a second bearing platform (51) and a second force transmission rod (52), and the shape of the second force transmission rod (52) is matched with the inner cavity of the sample cylinder (3).
2. A test piece static pressure forming apparatus according to claim 1, comprising a plurality of positioning sections (31), each positioning section (31) being detachably connected to each other.
3. The device for the static pressure forming of a test piece according to claim 1, wherein the joint of the positioning sections (31) is provided with a female ring and a male ring which are matched with each other.
4. The device for the static pressure forming of a test piece according to claim 1, wherein the joint of the positioning section (31) and the sample receiving section (32) is provided with a female ring and a male ring which are matched with each other.
5. The specimen static pressure forming device according to claim 1, characterized in that the top of the positioning section (31) and/or the specimen containing section (32) is provided with a concave ring matching with the outer diameter of the first bearing table (11).
6. The specimen static pressure forming apparatus according to claim 1, wherein the bottom of the specimen-receiving section (32) is provided with a collar which fits the inner diameter of the specimen-container (41).
7. The specimen static pressure forming apparatus according to claim 1, wherein the inner cavity of the specimen cartridge (3) is cylindrical.
8. The device for the static pressure forming of test pieces according to claim 1, characterized in that the base (4) and the sample receiving section (32) of the sample holder (3) are provided with cooperating limit stops (42).
9. The static pressure forming device for the test piece according to claim 6, wherein a limit rod (421) is arranged on the base, a protruding part is arranged on the sample containing section (32) of the sample cylinder (3), a limit groove (422) is arranged on the protruding part, and the limit rod (421) is matched with the limit groove (422).
10. The specimen static pressure forming apparatus according to claim 1, wherein the second dowel (52) has a length greater than the length of the specimen receiving section (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920771655.7U CN210180783U (en) | 2019-05-27 | 2019-05-27 | A test piece static pressure forming device for geotechnique triaxial compression test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920771655.7U CN210180783U (en) | 2019-05-27 | 2019-05-27 | A test piece static pressure forming device for geotechnique triaxial compression test |
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| CN113029719A (en) * | 2021-03-10 | 2021-06-25 | 山东大学 | Preparation device and method for rock-soil model test piece |
| CN113029719B (en) * | 2021-03-10 | 2022-03-25 | 山东大学 | Preparation device and method for rock-soil model test piece |
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