CN104655463A - Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil - Google Patents
Vibration table-based sample preparation device and vibration table-based sample preparation method for large-scale triaxial test of coarse grained soil Download PDFInfo
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- CN104655463A CN104655463A CN201510066219.6A CN201510066219A CN104655463A CN 104655463 A CN104655463 A CN 104655463A CN 201510066219 A CN201510066219 A CN 201510066219A CN 104655463 A CN104655463 A CN 104655463A
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Abstract
The invention discloses a vibration table-based sample preparation device and a vibration table-based sample preparation method for a large-scale triaxial test of coarse grained soil. An improved table top of a vibration table is adopted, so that a sample base and a protective arm can be fixed and conveniently disassembled and lifted; based on the vibration effect of the vibration table, samples are compacted by vibration layer by layer, so that the grain breakage rate of the coarse grained soil samples can be reduced in the sample preparation process; the heights of all the layers of samples can be monitored in real time by a vernier caliper capable of freely moving along the vertical direction, so that the density of the samples can be better controlled; the prepared samples are placed on a GDS large dynamic triaxial test apparatus by a small-sized crane; after the device and the method are used, low breakage rate, easy control and high accuracy are realized in the large-scale triaxial test process on the whole; the device and the method have great promotion and popularization functions for large-scale triaxial static and dynamic tests related to the coarse grained soil in the future.
Description
Technical field
The invention belongs to soil dynamics shop experiment technical field, relate to sample preparation device and the method for the large-scale quiet dynamic triaxial tests of a kind of coarse-grained soil, particularly a kind of sample preparation device of the coarse-grained soil Large-scale Triaxial Experiments based on shaking table and method.
Background technology
Along with economic development is to the continuous growth of trip demand, China's Transport Facility Construction enters the high speed development stage.Highway and railway bed are generally made up of coarse-grained soil, under high speed, heavy loading and large discharge traffic cyclic load, between roadbed particle often occur slide extruding and broken, macro manifestations appears large subgrade settlement, subgrade stiffness weakens and stress in ground is significantly increased, and even causes road unstability.Therefore, be necessary that the mechanical deformation characteristic for roadbed filling is studied, to improve the military service performance of roadbed filling layer.And roadbed filling is made up of coarse-grained soil, particle size range is 0.1mm-60mm, and due to specimen finish and the restriction of the largest particles material diameter ratio, traditional small-sized triaxial instrument cannot carry out the kinematic behavior of Large stone coarse-grained soil under different gradation.The kinematic behavior of large-scale quiet dynamic triaxial apparatus to coarse-grained soil need be adopted to study, and the diameter of the large-scale sample of more common coarse-grained soil is 30cm, and height is 60cm, and in sample, the maximum particle diameter of granular soil can reach 60mm.The how packing of Control Assay, reduces the fragmentation of particle in sample making course and does not change sample grating to become research successfully crucial.Sample debulking methods conventional is at present divided into compacting process and vibro-compaction method.Compacting process is divided into manually hitting and real and electronicly hits reality, and manually hitting needs larger human cost in fact, and electronic to hit real cost high, and sample is hitting in real process easily broken, can cause the change of grating.Reducing filler percentage of damage is the key making the large three axle samples of high-quality.Have scholar to place Vib. at specimen surface to carry out layering jolt ramming and carry out controlled fragmentation rate, but surface vibrator exciting force is limited, and can not Real-Time Monitoring every layer specimen height, cannot the packing of Control Assay very well.So the object of the invention is the method for making sample exploring the large-scale quiet dynamic triaxial tests of a kind of new coarse-grained soil, better Control Assay packing, reduces Particle Breakage rate in sample making course, reaches better sample quality, and can reduce human cost.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of sample preparation device and method of the coarse-grained soil Large-scale Triaxial Experiments based on shaking table are provided, to improve coarse-grained soil Large-scale Triaxial Experiments precision and efficiency, the packing of more accurate Control Assay, reduce the percentage of damage of sample, reduce sample preparation error to the impact of test findings.
The object of the invention is to be realized by following object: a kind of sample preparation device of the coarse-grained soil Large-scale Triaxial Experiments based on shaking table;
This device comprises concrete foundation, shaking table bottom, frequency modulation motor, vibrating spring, shaking table top, sample chassis, specimen mount, retaining wall, web member, rubber membrane, permeable slabstone, filter paper, cushion block, counterweight, four-bladed vane and vernier caliper, sleeve;
Shaking table bottom is fixedly mounted in concrete foundation, and frequency modulation motor is arranged in shaking table bottom; Four vibrating spring lower ends are fixedly mounted on above shaking table bottom, and shaking table top is fixedly mounted on four vibrating spring upper ends; The upper surface on described shaking table top is vibration table, and vibration table has been coated with antirust oil reservoir; Sample chassis is fixedly mounted on vibration table, sample chassis side wall has four symmetrical chassis grooves;
Specimen mount is made up of upper round platform and lower round platform, and lower round platform is installed in sample chassis, and the height of lower round platform is equal with the interior height on sample chassis; Lower round platform has four symmetrical base grooves, and four chassis grooves are relative with four base grooves respectively; Upper round platform is fixed on above lower round platform, and upper round platform diameter is less than the diameter of lower round platform; Retaining wall is arranged on round platform periphery, retaining wall is provided with two handles; Web member one end is connected with handle, and the other end is fixed on vibration table; Rubber membrane is placed on the madial wall of retaining wall; In armlet, specimen mount places permeable slabstone and filter paper successively, place sample in armlet, cushion block is placed in above sample, and counterweight is placed in above cushion block; Four-bladed vane is arranged on armlet end face, four-bladed vane has slot some, and vernier caliper inserts in slot; Described sleeve is made up of sleeve upper strata and sleeve lower floor, and sleeve upper strata internal diameter equals armlet internal diameter, and sleeve lower floor internal diameter is greater than armlet external diameter, highly equals sleeve end face to handle height.During use, sleeve lower floor is enclosed within outside armlet, and sleeve bottom end is placed on two handles.
Based on a method for making sample for the coarse-grained soil Large-scale Triaxial Experiments of shaking table, the method comprises the following steps:
(1) be positioned in chassis by specimen mount, four chassis grooves are relative with four base grooves respectively.Specimen mount is put permeable slabstone and filter paper;
(2) on base, be inserted in rubber membrane, then retaining wall be enclosed within outside rubber membrane, be positioned over lower round platform and chassis coboundary is formed in plane, and connect armlet handle and vibration table with web member;
(3) divide five layers to load sample, every layer of sample height 12cm, then chipping sample end face guarantees that end face is smooth.Sample is put cushion block and counterweight, then put four-bladed vane at armlet end face, in four-bladed vane, insert vernier caliper;
(4) frequency modulation motor is opened; By vernier caliper reading, Real-Time Monitoring specimen height, when reaching intended height, turning off frequency modulation motor, unloading counterweight, use the same method and load one deck;
(5) when loading last one deck, by jacket casing outside retaining wall, load sample, then chipping sample end face guarantees that end face is smooth; Sample is put cushion block and counterweight, open frequency modulation motor, vibration is until sample end face flushes with armlet end face;
(6) holdfast is inserted four chassis grooves until base groove, sample is sling together with specimen mount and retaining wall, be placed on large-scale three axle sample instruments, complete sample preparation.
Beneficial effect of the present invention is, is achieved the vibrating compacting sample preparation of test, decrease the percentage of damage of coarse-grained soil in sample making course by the shaking table improved; By the vernier calliper slide calliper rule vertically moved freely, the height of the good Real-Time Monitoring every layer sample of energy in layering jolt ramming, with the packing of better Control Assay; The vibration table improved can facilitate the installation of sample and respective seat and armlet, dismounting and lifting, directly can be placed on the large-scale dynamic triaxial tests instrument of GDS carry out follow-up test by small-sized crane.
Accompanying drawing explanation
Fig. 1 is that the present invention improves shaking table sample-preparing system schematic diagram;
Fig. 2 is that the present invention fills front four layers of sample schematic diagram;
Fig. 3 is that the present invention fills layer 5 sample schematic diagram;
Fig. 4 is the structural representation on chassis;
Fig. 5 is the structural representation of specimen mount;
Fig. 6 is the structural representation of sleeve section;
In figure, concrete foundation 1, shaking table bottom 2, vibrating spring 3, shaking table top 4, vibration table 5, sample chassis 6, chassis groove 6a, specimen mount 7, upper round platform 7a, lower round platform 7b, base groove 7c, retaining wall 8, web member 9, rubber membrane 10, permeable slabstone 11, filter paper 12, sample 13, cushion block 14, counterweight 15, four-bladed vane 16 and vernier caliper 17, sleeve 18, sleeve upper strata 18a, sleeve lower floor 18b.
Embodiment
As shown in Fig. 1 ~ 6, whole improvement shaking table is all fixed in concrete foundation 1 with expansion bolt, to avoid shaking in shaking table vibration processes broken ceramic tile, causes uneven generation eccentric force at the bottom of shaking table, affects sample preparation effect.Shaking table bottom 2 is built with special frequency modulation motor, and controlled damping dynamic frequency and amplitude, noise is little.Four vibrating spring 3 lower ends are fixedly mounted on shaking table lower top, and shaking table top 4 is fixedly mounted on four vibrating spring 3 upper ends; Vibration table 5 is coated antirust oil reservoir, and used transparent plastic mask.Vibration table hits exactly the sample chassis 6 secured as shown in Figure 4, for retraining specimen mount 7.Sample chassis 6 wall has four symmetrical chassis groove 6a, so that it is used to lift by crane sample after installing sample.As shown in Figure 5, specimen mount 7 is made up of upper round platform 7a and lower round platform 7b, lower round platform 7b diameter is larger, just be put in sample chassis 6 (its diameter is slightly less than sample chassis 6 internal diameter), the height of lower round platform 7b is equal with the interior height on sample chassis 6, and when being put in sample chassis 6, end face and sample chassis 6 coboundary of following table 7b are contour, for common support retaining wall 8, prevent retaining wall 8 from sliding from lower round platform 7b in dress sample process.The bottom of lower round platform 7b also has four symmetrical base groove 7c, aligns respectively with the chassis groove 6a on the wall of sample chassis 6, lengthens holdfast lifting sample to insert in lifting process.Upper round platform 7a diameter is less, for placing sample.Retaining wall 8 is positioned over the periphery of round platform 7a, and is positioned at lower round platform 7b and chassis 6 coboundary is formed in plane.Armlet 8 is provided with left and right handle; Web member 9 one end is connected with handle, and other end anchor is on vibration table 5; Web member 9 is generally assembled by the gaily decorated basket, snap-on, hanging ring screw, eyenut, rocks skew to prevent armlet 8 in vibration processes.Armlet 8 inner sleeve has rubber membrane 10, base 7 is placed successively permeable slabstone 11 and filter paper 12 in armlet 8.13 points five layers, sample is loaded on armlet inside.Sample is placed with cushion block 14 and counterweight 15(100kg), cushion block 14 can prevent counterweight 15 from directly contacting with sample 13, and avoid coarse-grained soil specimen to occur to rub with the counterweight 15 that weares and teares with counterweight 15 in vibration processes, counterweight 15 diameter is slightly less than armlet 8 internal diameter.Armlet 8 end face puts four-bladed vane 16, and four-bladed vane 16 has some slots, to insert the specimen height that vernier caliper 17 reads diverse location, and ensures that vernier paperboard is vertically placed.When loading layer 5 sample, sleeve 18 is enclosed within the periphery on armlet 8 top, sleeve 18 as shown in Figure 6, be made up of sleeve upper strata and sleeve lower floor, sleeve upper strata internal diameter equals armlet internal diameter, for retraining cushion block 14 and counterweight 15, sleeve lower floor internal diameter is greater than armlet external diameter, highly equals sleeve end face to handle height.Whole sleeve 18 is by the load-bearing of armlet handle.In the shaking table system of whole improvement, parts 1 to 6 are respectively long-term fixed part, once after installation, immobilize in follow-up test, and parts 7 to 18 are the part needing repetition installation and dismantling in each test.
sample preparation comprises the steps:
(1) be positioned in chassis 6 by specimen mount 7, four chassis groove 6a are relative with four base groove 7c respectively.Specimen mount 7 is put permeable slabstone 11 and filter paper 12;
(2) on base 7, be inserted in rubber membrane 10, then retaining wall 8 be enclosed within outside rubber membrane 10, be positioned over lower round platform 7b and chassis 6 coboundary is formed in plane, and connect armlet handle and vibration table surface 5 with web member 9;
(3) divide five layers to load sample 13, every layer of sample height 12cm, then chipping sample end face guarantees that end face is smooth.Sample is put cushion block 14 and counterweight 15, then put four-bladed vane 16 at armlet 8 end face, in four-bladed vane 16, insert vernier caliper 17;
(4) frequency modulation motor is opened; By vernier caliper reading, Real-Time Monitoring specimen height, when reaching intended height, turns off frequency modulation motor, unloads counterweight 15, uses the same method and load one deck;
(5) when loading last one deck, be enclosed within by sleeve 18 outside retaining wall 8, load sample 13, then chipping sample end face guarantees that end face is smooth; Sample is put cushion block 14 and counterweight 15, open frequency modulation motor, vibration is until sample end face flushes with armlet end face;
(6) insert holdfast respectively until certain distance in base groove 7c from four chassis groove 6a, sample is sling together with specimen mount 7 and retaining wall 8, is placed on Large-scale Triaxial Experiments instrument, completes sample preparation.
Claims (2)
1. the sample preparation device based on the coarse-grained soil Large-scale Triaxial Experiments of shaking table, it is characterized in that, this device comprises concrete foundation (1), shaking table bottom (2), frequency modulation motor, vibrating spring (3), shaking table top (4), sample chassis (6), specimen mount (7), retaining wall (8), web member (9), rubber membrane (10), permeable slabstone (11), filter paper (12), cushion block (14), counterweight (15), four-bladed vane (16) and vernier caliper (17), sleeve (18);
Shaking table bottom (2) is fixedly mounted in concrete foundation (1), and frequency modulation motor is arranged in shaking table bottom (2); Four vibrating spring (3) lower ends are fixedly mounted on above shaking table bottom, and shaking table top (4) are fixedly mounted on four vibrating spring (3) upper ends; The upper surface of described shaking table top (4) is called vibration table (5), and vibration table (5) has been coated with antirust oil reservoir; Sample chassis (6) is fixedly mounted on vibration table (5), sample chassis (6) sidewall has four symmetrical chassis grooves (6a);
Specimen mount (7) is made up of upper round platform (7a) and lower round platform (7b), and lower round platform (7b) is installed in sample chassis (6), and the height of lower round platform (7b) is equal with the interior height of sample chassis (6); Lower round platform (72) has four symmetrical base grooves (7c), and four chassis grooves (6a) are relative with four base grooves (7c) respectively; Upper round platform (7a) is fixed on lower round platform (7b) top, and upper round platform (71) diameter is less than the diameter of lower round platform (72); Retaining wall (8) is arranged on round platform (7a) periphery, and (8) are provided with two handles to retaining wall; Web member (9) one end is connected with handle, and the other end is fixed on vibration table (5); Rubber membrane (10) is placed on the madial wall of retaining wall (8); Armlet (8) interior specimen mount (7) is placed successively permeable slabstone (11) and filter paper (12), place sample (13) in armlet (8), cushion block (14) is placed in above sample, and counterweight (15) is placed in above cushion block; Four-bladed vane (16) is arranged on armlet (8) end face, four-bladed vane (16) has slot some, and vernier caliper (17) inserts in slot; Described sleeve (18) is made up of sleeve upper strata (18a) and sleeve lower floor (18b), sleeve upper strata (18a) internal diameter equals armlet (8) internal diameter, sleeve lower floor (18b) internal diameter is greater than armlet (8) external diameter, highly equal sleeve (18) end face to handle height, during use, sleeve lower floor (18b) is enclosed within armlet (8) outside, and sleeve (18) bottom is placed on two handles.
2. based on a method for making sample for the coarse-grained soil Large-scale Triaxial Experiments of shaking table, it is characterized in that, the method can realize on sample preparation device according to claim 1, and the method can comprise the following steps:
(1) be positioned in chassis (6) by specimen mount (7), four chassis grooves (6a) are relative with four base grooves (7c) respectively;
Specimen mount (7) is put permeable slabstone (11) and filter paper (12);
(2) on base (7), rubber membrane (10) is inserted in, then retaining wall (8) is enclosed within rubber membrane (10) outside, be positioned over lower round platform (7b) to form in plane with chassis (6) coboundary, and connect armlet handle and vibration table (5) with web member (9);
(3) divide five layers to load sample (13), every layer of sample height 12cm, then chipping sample end face guarantees that end face is smooth;
Sample is put cushion block (14) and counterweight (15), then put four-bladed vane (16) at armlet (8) end face, in four-bladed vane (16), insert vernier caliper (17);
(4) frequency modulation motor is opened; By vernier caliper reading, Real-Time Monitoring specimen height, when reaching intended height, turns off frequency modulation motor, unloads counterweight (15), uses the same method and load one deck;
(5), when loading last one deck, sleeve (18) is enclosed within retaining wall (8) outside, load sample (13), then chipping sample end face guarantees that end face is smooth; Sample is put cushion block (14) and counterweight (15), open frequency modulation motor, vibration is until sample end face flushes with armlet end face;
(6) holdfast is inserted chassis groove (6a) until base groove (7c), sample is sling together with specimen mount (7) and retaining wall (8), be placed on large-scale three axle sample instruments, complete sample preparation.
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| CN105181720A (en) * | 2015-09-14 | 2015-12-23 | 长江水利委员会长江科学院 | Coarse-grained soil large-size three-bearing sample device fit for CT scanning and use method of device |
| CN105510099A (en) * | 2016-01-13 | 2016-04-20 | 中南大学 | Heavy heterogeneous soil remodeling sample preparation device |
| CN112945735A (en) * | 2021-04-12 | 2021-06-11 | 昆明理工大学 | Layered triaxial experiment tailing sample loading device |
| CN113670771A (en) * | 2021-07-16 | 2021-11-19 | 李建军 | Variable-pressure vibration maximum dry density measuring device |
| CN113945602A (en) * | 2021-10-22 | 2022-01-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Experimental device and method for rapid sample loading of metallurgy molten drops |
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