CN105372128A - Method for testing graded broken stone true triaxial apparatus in mixed boundary loading mode - Google Patents
Method for testing graded broken stone true triaxial apparatus in mixed boundary loading mode Download PDFInfo
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- CN105372128A CN105372128A CN201510696390.5A CN201510696390A CN105372128A CN 105372128 A CN105372128 A CN 105372128A CN 201510696390 A CN201510696390 A CN 201510696390A CN 105372128 A CN105372128 A CN 105372128A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention discloses a method for testing a graded broken stone true triaxial apparatus in a mixed boundary loading mode. The graded broken stone true triaxial apparatus comprises a pressure chamber assembly and a loading system. The testing method comprises the steps of placing a pressure chamber base on a vibration table; on the pressure chamber base, forming a cubic chamber through mutual lap joint of four rigid loading plates and four combined loading plates; forming a sample through a vibration method in the cubic chamber; after the sample is formed, placing a top loading plate, top rigid loading ends and a pressure chamber cover plate to integrally form the pressure chamber assembly; transferring the pressure chamber assembly between a loading system base plate and a loading system top plate; after the pressure chamber assembly is in position, adjusting five servo loading systems, so that the five servo loading systems are in contact with the corresponding rigid loading ends; and according to a predetermined test scheme, controlling the five servo loading systems to finish the sample loading process. According to the method, the structure is simple, the size of an applicable sample is large, the three-dimensional load application can be finished, and the load intensity is high.
Description
Technical field:
The invention belongs to road engineering technical field, be specifically related to a kind of test method of graded broken stone true triaxil tester of compound boundary load mode.
Background technology:
In road engineering, graded broken stone is in complicated 3-D stree field, is generally in compression-shear stress state.Under the effect of compression-shear stress, the yield stress of graded broken stone structural damage dispersed material structure often reaches the upper limit, causes material generation plastic flow deformation to cause.Normal triaxial pressure test have studied the impact of confined pressure on graded broken stone deformation and failure, and does not consider the impact of intermediate principal stress on graded broken stone elastoplastic property.Under anisobaric triaxial stress state, intermediate principal stress is on the impact of graded broken stone deformation-strength characteristic, be in recent years since one of the advanced subject explored of field of road.
Summary of the invention:
Object of the present invention, for the deficiencies in the prior art, provides a kind of test method of graded broken stone true triaxil tester of compound boundary load mode.
For achieving the above object, the present invention adopts following technical scheme to be achieved:
A test method for the graded broken stone true triaxil tester of compound boundary load mode, this graded broken stone true triaxil tester comprises pressure chamber's assembly and loading system, wherein, pressure chamber's assembly comprises pressure chamber base, be arranged on four rigidity load plate of pressure chamber base top surrounding, and four the rigidity loading ends be separately positioned on outside four rigidity load plate, pressure chamber base and four rigidity load plate form a cube of cavity, cuboid sample is positioned at this cube of cavity, the top of four rigidity load plate and cuboid sample is provided with top rigid load plate and pressure chamber's cover plate from bottom to top, the center of this pressure chamber's cover plate offers slotted eye, top rigid load plate arranged outside in slotted eye has top rigid loading end,
Loading system comprises the loading system base plate and loading system top board that be arranged in parallel, is arranged on four servo loading systems between loading system base plate and loading system top board, and is arranged on the axial servo loading system at loading system top board top; During test, pressure chamber's assembly is arranged between loading system base plate and loading system top board, and four servo loading systems and axial servo loading system are respectively used to four rigidity loading ends and top rigid loading end force;
This experimental technique comprises the following steps:
1) pressure chamber base is placed on shaking table;
2) in the surrounding of pressure chamber base top, formation cube of cavity is mutually overlapped by four rigidity load plate;
3) in cube cavity formed, the shaping cuboid sample of vibratory drilling method is passed through;
4) by vibratory drilling method complete cuboid sample shaping after, top rigid load plate and top rigid loading end are placed, and by pressure chamber's cover plate place, adjust position, overall mineralization pressure chamber component;
5) by pressure chamber's assembly dislocation between loading system base plate and loading system top board;
6) pressure chamber's assembly in place after, adjust four servo loading systems, make it contact with corresponding rigidity loading end respectively, adjust axial servo loading system, make it contact with top rigid loading end;
7) according to predetermined testing program, realize loading cuboid sample by four servo loading systems and axial servo loading system, namely complete the loading procedure to cuboid sample.
The present invention further improves and is, the slotted eye that pressure chamber offers cover plate center is square slotted eye.
The present invention further improves and is, is also provided with a combined type load plate between each rigidity load plate and cuboid sample circumference.
The present invention further improves and is, each combined type load plate comprises elasticity grid and the Stiff Block for filling this elasticity grid gap.
The present invention further improves and is, loading system also comprises the steel plate washer be arranged between pressure chamber base and loading system base plate.
The present invention further improves and is, loading system also comprises the lift rail plate be arranged between pressure chamber base and loading system base plate.
The present invention further improves and is, the controller that each servo loading system and axial servo loading system include hydraulic jack and stretch for hydraulic control oil cylinder.
The present invention further improves and is, all start there is square groove bottom pressure chamber base top and pressure chamber's cover plate, top rigid load plate is arranged in the square groove of pressure chamber's cover plate, and the two ends of four rigidity load plate are separately positioned in the square groove surrounding of pressure chamber base and the square groove surrounding of pressure chamber's cover plate.
Compared with prior art, the present invention has following Advantageous Effects:
The graded broken stone true triaxil tester of compound boundary load mode provided by the invention, has simple structure, uses sample dimensions large, can complete three-dimensional load and apply, the advantage that load application intensity is high.
Use five to overlap Hydrauservo Systems in test method of the present invention and apply the loading of hybrid border, graded broken stone sample can realize the loading of three-dimensional equipressure and three-dimensional anisobaric loads, and can realize the loading of different load mode.When xial feed is maximum, graded broken stone sample is in vertical direction generation compression deformation, and the hybrid load plate of sample horizontal direction is also along with compression deformation; When horizontal direction load is maximum, due to rigidity load plate and base all through special processing in like manner, can be free to slide, can there is compression deformation in sample in the horizontal direction, and two other direction expands thereupon.Be reserved with certain spacing between each rigidity load plate, also effectively can avoid the mutual interference between rigidity load plate.
Accompanying drawing illustrates:
Fig. 1 is the cross-sectional structure schematic diagram of graded broken stone true triaxil tester pressure chamber assembly.
Fig. 2 is the vertical section structure schematic diagram of graded broken stone true triaxil tester pressure chamber assembly.
Fig. 3 is the schematic perspective view of graded broken stone true triaxil tester pressure chamber assembly.
Fig. 4 is the schematic perspective view of graded broken stone true triaxil tester.
Fig. 5 is the structural representation of combined type load plate.
In figure: 1 is the first rigidity loading end, 4 is the second rigidity loading end, and 7 is the 3rd rigidity loading end, and 10 is the 4th rigidity loading end, 2 is the first rigidity load plate, 5 is the second rigidity load plate, and 8 is the 3rd rigidity load plate, and 11 is the 4th rigidity load plate, 3 is the first combined type load plate, 6 is the second combined type load plate, and 9 is the 3rd combined type load plate, and 12 is the 4th combined type load plate; 13 is pressure chamber base, and 14 is cuboid sample; 15 is elasticity grid, and 16 is Stiff Block, and 17 is pressure chamber's cover plate, and 18 is top rigid load plate, and 19 is top rigid loading end;
20 is axial servo loading system, and 21 is the first servo loading system, and 22 is the second servo loading system, and 23 is the 3rd servo loading system, and 24 is the 4th servo loading system; 25 is pressure chamber's assembly, and 26 is lift rail plate, and 27 is steel plate washer, and 28 is loading system top board, and 29 is loading system base plate.
Embodiment:
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figures 1 to 4, the graded broken stone true triaxil tester of compound boundary load mode provided by the invention, comprises pressure chamber's assembly 25 and loading system, wherein, pressure chamber's assembly 25 comprises pressure chamber base 13, be arranged on four rigidity load plate of pressure chamber base 13 top surrounding, and four the rigidity loading ends be separately positioned on outside four rigidity load plate, pressure chamber base 13 and four rigidity load plate form a cube of cavity, cuboid sample 14 is positioned at this cube of cavity, the top of four rigidity load plate and cuboid sample 14 is provided with top rigid load plate 18 and pressure chamber's cover plate 17 from bottom to top, the center of this pressure chamber's cover plate 17 offers square slotted eye, top rigid load plate 18 arranged outside in square slotted eye has top rigid loading end 19.In addition, pressure chamber base 13 is rigid support plate, and surface, through process, makes friction factor between four combined type load plate very little.
Loading system comprises the loading system base plate 29 and loading system top board 28 that be arranged in parallel, be arranged on four servo loading systems between loading system base plate 29 and loading system top board 28, and be arranged on the axial servo loading system 20 at loading system top board 28 top; During test, pressure chamber's assembly 25 is arranged between loading system base plate 29 and loading system top board 28, and four servo loading systems and axial servo loading system 20 are respectively used to exert a force to four rigidity loading ends and top rigid loading end 19.Specifically, by four rigidity loading ends, load application is carried out to four rigidity load plate, and then four side load applications to cuboid sample 14, reach top rigid load plate 18 by top rigid loading end 19 load application, remake the end face being used in cuboid sample 14.Pressure chamber base 13 and pressure chamber's cover plate 17 realize the constrained of pressure cell jointly, form the cuboid sample 14 that six bread enclose.
Further, a combined type load plate is also provided with between each rigidity load plate and cuboid sample 14 circumference.Specifically, four rigidity load plate are respectively first to fourth rigidity load plate 2,5,8 and 10, four rigidity loading ends corresponding outside four rigidity load plate are respectively the combined type load plate arranged between first to fourth rigidity loading end 1,4,7 and 10, first to fourth rigidity load plate 2,5,8 and 10 and cuboid sample 14 circumference and are respectively first to fourth combined type load plate 3,6,9 and 12.Four servo loading systems of first to fourth rigidity loading end 1,4,7 and 10 correspondence are respectively first to fourth servo loading system 21,22,23 and 24.And have, the controller that each servo loading system and axial servo loading system 20 include hydraulic jack and stretch for hydraulic control oil cylinder.Wherein, the first servo loading system 21 and the 3rd servo loading system 23 are subtend loading system, and the level that applies is to load; Second servo loading system 22 and the 4th servo loading system 24 are subtend loading system, and the level that applies is to load; Axial servo loading system 20 applies xial feed.
Specifically, offer square slotted eye in the center of pressure chamber's cover plate 17, axial servo loading system 20 stretches out with the square slotted eye from pressure chamber's cover plate 17 and is connected with top rigid loading end 19, applies xial feed.First servo loading system 21 is directly connected with the first rigidity loading end 1, second servo loading system 22 is directly connected with the second rigidity loading end 4,3rd servo loading system 23 is directly connected with the 3rd rigidity loading end 7,4th servo loading system 24 is directly connected with the 4th rigidity loading end 10, the level that applies respectively to load, and controls the while that each servo loading system carrying out and asymmetrical load by microsystem.
As shown in Figure 5, each combined type load plate comprises elasticity grid 15 and the Stiff Block 16 for filling this elasticity grid 15 gap.Combined type load plate is connected to form by Stiff Block 16 and elasticity grid 15 embedded squeezing, and Stiff Block 16 and elasticity grid 15 are uniformly distributed according to a certain percentage, and by Stiff Block 16 pairs of test specimen load applications, elasticity grid 15 realizes the loading surface deformation of test specimen in loading procedure.
As shown in Figure 4, loading system also comprises and is arranged on steel plate washer 27 between pressure chamber base 13 and loading system base plate 29 and lift rail plate 26, lift rail plate 26 can facilitate the load and unload of pressure chamber, is adjusted the height of pressure chamber's assembly 25 below pressure chamber's assembly 25 by steel plate washer 27.
Further, all start there is square groove bottom pressure chamber base 13 top and pressure chamber's cover plate 17, top rigid load plate 18 is arranged in the square groove of pressure chamber's cover plate 17, and the two ends of four rigidity load plate are separately positioned in the square groove surrounding of pressure chamber base 13 and the square groove surrounding of pressure chamber's cover plate 17.
Principle of work of the present invention is:
Servo loading system is controlled by microcomputer, xial feed is applied by end face rigidity load plate 19 by axial servo loading system 20, load applies xial feed equably by end face rigid load plate 18 pairs of graded broken stone cuboid samples 14, adjust loading surface by first to fourth combined type load plate 3,6,9 and 12 in the horizontal direction simultaneously, cuboid sample 14 can be ensured not by the impact of loading surface change.
First servo loading system 21 and the second servo loading system 22 form horizontal subtend loading system, 3rd servo loading system 23 and the 4th servo loading system 24 form horizontal subtend loading system, guarantee that cuboid sample 14 is in symmetric State all the time by subtend asymmetrical load.In like manner, when level is to applying maximum axial load, another horizontal direction and axial loading surface also can change thereupon, ensure cuboid sample 14 and loading surface deform in same pace.
The test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode of the present invention, comprises the following steps:
1) pressure chamber base 13 is placed on shaking table;
2) in pressure chamber base 13, a cube of cavity is formed by first to fourth combined type load plate 3,6,9 and 12 and first to fourth rigidity load plate 2,5,8 and 10, first to fourth combined type load plate 3,6,9 and 12 is at internal layer, first to fourth rigidity load plate 2,5,8 and 10 is at skin, interior layer composite load plate mutually overlaps and forms, and outer field rigidity load plate pushes down the half of each combined type load plate thickness;
3) shaping cuboid sample 14 in cube cavity formed;
4) complete cuboid sample 14 by vibratory drilling method, after sample is shaping, top rigid load plate 18 and top rigid loading end 19 is placed, and pressure chamber's cover plate 17 is placed, adjust position, overall mineralization pressure chamber component 25;
5) by pressure chamber's assembly 25 dislocation on lift rail plate 26, by lift rail plate 26, pressure chamber's assembly 25 is pushed into predetermined loading position, and the height of lifting pressure chamber component 25, increase steel plate washer 27 in the below of pressure chamber and make pressure chamber in place;
6) pressure chamber's assembly 25 in place after, adjust first to fourth servo loading system 21,22,23 and 24, make it contact with first to fourth corresponding rigidity loading end 1,4,7 and 10, adjust axial servo loading system 20, make it contact with top rigid loading end 19;
7) according to predetermined testing program, realize loading cuboid sample 14 by four servo loading systems and axial servo loading system 20, namely complete the loading procedure to cuboid sample 14.
Claims (8)
1. a test method for the graded broken stone true triaxil tester of compound boundary load mode, is characterized in that, this graded broken stone true triaxil tester comprises pressure chamber's assembly (25) and loading system, wherein, pressure chamber's assembly (25) comprises pressure chamber base (13), be arranged on four rigidity load plate of pressure chamber base (13) top surrounding, and four the rigidity loading ends be separately positioned on outside four rigidity load plate, pressure chamber base (13) and four rigidity load plate form a cube of cavity, cuboid sample (14) is positioned at this cube of cavity, the top of four rigidity load plate and cuboid sample (14) is provided with top rigid load plate (18) and pressure chamber's cover plate (17) from bottom to top, the center of this pressure chamber's cover plate (17) offers slotted eye, top rigid load plate (18) arranged outside in slotted eye has top rigid loading end (19),
Loading system comprises the loading system base plate (29) and loading system top board (28) that be arranged in parallel, be arranged on four servo loading systems between loading system base plate (29) and loading system top board (28), and be arranged on the axial servo loading system (20) at loading system top board (28) top; During test, pressure chamber's assembly (25) is arranged between loading system base plate (29) and loading system top board (28), and four servo loading systems and axial servo loading system (20) are respectively used to four rigidity loading ends and top rigid loading end (19) force;
This experimental technique comprises the following steps:
1) pressure chamber base (13) is placed on shaking table;
2) in the surrounding of pressure chamber base (13) top, formation cube of cavity is mutually overlapped by four rigidity load plate;
3) in cube cavity formed, the shaping cuboid sample of vibratory drilling method (14) is passed through;
4) by vibratory drilling method complete cuboid sample (14) shaping after, top rigid load plate (18) and top rigid loading end (19) are placed, and pressure chamber's cover plate (17) is placed, adjust position, overall mineralization pressure chamber component (25);
5) by pressure chamber's assembly (25) dislocation between loading system base plate (29) and loading system top board (28);
6) pressure chamber's assembly (25) in place after, adjust four servo loading systems, make it contact with corresponding rigidity loading end respectively, adjust axial servo loading system (20), make it contact with top rigid loading end (19);
7) according to predetermined testing program, realize loading cuboid sample (14) by four servo loading systems and axial servo loading system (20), namely complete the loading procedure to cuboid sample (14).
2. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 1, is characterized in that, the slotted eye that pressure chamber's cover plate (17) center is offered is square slotted eye.
3. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 1, is characterized in that, is also provided with a combined type load plate between each rigidity load plate and cuboid sample (14) circumference.
4. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 3, it is characterized in that, each combined type load plate comprises elasticity grid (15) and the Stiff Block (16) for filling this elasticity grid (15) gap.
5. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 1, it is characterized in that, loading system also comprises the steel plate washer (27) be arranged between pressure chamber base (13) and loading system base plate (29).
6. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 5, it is characterized in that, loading system also comprises the lift rail plate (26) be arranged between pressure chamber base (13) and loading system base plate (29).
7. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 1, it is characterized in that, the controller that each servo loading system and axial servo loading system (20) include hydraulic jack and stretch for hydraulic control oil cylinder.
8. the test method of the graded broken stone true triaxil tester of a kind of compound boundary load mode according to claim 1, it is characterized in that, pressure chamber base (13) top and pressure chamber's cover plate (17) bottom all start there is square groove, top rigid load plate (18) is arranged in the square groove of pressure chamber's cover plate (17), and the two ends of four rigidity load plate are separately positioned in the square groove surrounding of pressure chamber base (13) and the square groove surrounding of pressure chamber's cover plate (17).
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Cited By (2)
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| CN108732048A (en) * | 2018-05-31 | 2018-11-02 | 长安大学 | A kind of elastoplasticity yield point stress of graded broken stone repeated-load test determines method |
| CN112432850A (en) * | 2020-11-16 | 2021-03-02 | 河海大学 | Three-way independent loading novel mixed boundary true triaxial apparatus |
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