CN103674706B - The dual-purpose test unit of tire earth structure pull-out model test and test measuring method - Google Patents
The dual-purpose test unit of tire earth structure pull-out model test and test measuring method Download PDFInfo
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- CN103674706B CN103674706B CN201310696149.3A CN201310696149A CN103674706B CN 103674706 B CN103674706 B CN 103674706B CN 201310696149 A CN201310696149 A CN 201310696149A CN 103674706 B CN103674706 B CN 103674706B
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Abstract
The invention discloses the dual-purpose test unit of a kind of tire earth structure pull-out model test and test measuring method, device of the present invention, by the vertical loading system in top, and coordinates respective measurement system can carry out reinforced earth model experiment; The large-scale drawing experiment of the reinforcement material such as tire, grid can be carried out in conjunction with side drawing load applying system and displacement measurement system by vertical loading system.This device comprises loading system, model system and measuring system.The corresponding loading of pull-out test and model test, measuring system combine by the present invention, compare with pull-out test device with conventional model, and experimentation cost reduces; Device overcomes the defect that conventional draw-off gear cannot carry out the three-dimensional reinforcement material pull-out tests such as tire; Measuring system Contents for Monitoring is comprehensive, accurately can measure, truly reflect stress-strain state to muscle material and the power of banketing, displacement etc.; Can be used for model test and the pull-out test of the unconventional earth structures such as tire.
Description
Technical field
The invention belongs to Geotechnical Engineering model test field, be specifically related to the dual-purpose test unit of a kind of tire earth structure pull-out model test and test measuring method.
Background technology
Junked tire earth structure, shock resistance is good, excellent durability, and easy construction is with low cost, and economic environmental protection, has broad application prospects in engineering practice.In tire earth structure, the factors such as the deformation characteristic of reinforcement material, the tension of tire string is broken, resistance to plucking goes out all will affect stability and the deformation characteristic of earth structure, the impact of the factors such as the anti-pull-out property at muscle soil interaction interface and valid bonding length, connected mode, overlying burden is the key inquiring into reinforced earth working property, failure mode and Reinforced Mechanism, is prerequisite and the basis of earth structure design.Because reinforcement material in junked tire reinforced structure is special, size is comparatively large, research is difficulty comparatively, and conventional Application of geosynthetics-reinforced test unit is difficult to the requirement meeting the test of junked tire Reinforced Mechanism.In addition, the test of rebar element body and small-scale model test are difficult to reflect prototype genuine property comprehensively, and site test boundary condition is wayward, accurately measure and are difficult to realize.
Junked tire reinforcement is flexible, and better have good distortion conformability, horizontally disposed reinforcement tire virgin state is rounded, with soil interaction, stressedly becomes irregular nearly ellipse, is out of shape relatively large.Use strain, the displacement measurement means such as traditional foil gauge, displacement meter, be difficult to the measurement requirement meeting tire strain, distortion, make the stress-strain analysis of tire become quite difficulty.And the stress-strain characteristics of tire affects ceramic-metal bond shearing strength, resistance to plucking Resistance Value, the control of reinforced earth deflection, and then have influence on earth structure resistance to overturning.The measuring method adopted in current earth structure model test and pull-out test, is difficult to play a role in tire earth structure.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect that existing reinforced earth modeling techniques exists, and the research for the special earth structures such as tire and conventional earth structure Reinforced Mechanism provides a kind of device for testing and test measuring method.
The technical scheme that device of the present invention adopts is: the dual-purpose test unit of a kind of tire earth structure pull-out model test, is characterized in that: comprise model system, loading system and measuring system;
Described model system is made up of model casing and counterforce device, before and after described model casing, two sides are made up of model framework main body, described model framework main body is welded by four horizontal angle steel and four vertical angle steel, described model casing left and right sides and bottom surface are by the horizontal angle steel described in the embedding of wooden form dividing plate and vertical angle steel inner seal, the horizontal angle steel described in the embedding of hollow space vitreous model dividing plate of described model framework main body and vertical angle steel inner seal, described wooden form dividing plate and vitreous model dividing plate are used for sash steel rib and steel rib reinforcement of vertically putting more energy into strengthen model equipment rigidity, described counterforce device is arranged in counterforce device beam framework, described counterforce device beam framework is made up of four vertical beams, two longerons and three crossbeams, three crossbeams are separately fixed at two ends and the centre of two longerons, and four described vertical beams are welded on the upper lateral angle steel of two sides before and after described model casing symmetrically,
Described loading system comprises and vertically adds subsystems and horizontal addload subsystem, the described subsystems that vertically adds comprises hydraulic jack and load plate, it is inner that described load plate is arranged on described model casing, described hydraulic jack is arranged in described load plate, is positioned at described counterforce device beam framework; Described horizontal addload subsystem comprises drawing load application system and the first bracing wire, and described drawing load application system is connected with reinforcement tire by described bracing wire, applies horizontal loading;
Described measuring system comprises displacement measurement system and the second bracing wire, and described displacement measurement system is connected with reinforcement tire by the second described bracing wire, for measuring the displacement of the second described bracing wire.
As preferably, the first described bracing wire, the second bracing wire are wire rope.
As preferably, described steel wire loop is located in the little flexible pipe of plastics, and the little soft casing pack butter of described plastics is to strengthen lubrication.
As preferably, described model casing medial surface is laid with tetrafluoroethylene or coating lubricant with the friction reducing to banket and between sidewall.
As preferably, described reinforcement tire reinforcement tire layer in series.
As preferably, described counterforce device, counterforce device beam framework, hydraulic jack are provided with four.
The technical scheme that method of the present invention adopts is: a kind of tire earth structure pullout strength measuring method, is characterized in that:
Described pull-out test and the load of model test read by pressure fuel pump table;
The interior pressure of described device is read by soil pressure cell;
Side distortion of banketing in described model test adopts trace labelling method to read, and domatic displacement adopts image acquisition method to read; In described pull-out test, squeegee action adopts displacement measurement system to measure;
Described model test, in the process of filling, the vitreous model dividing plate of described model casing and arrange coloured steel ball between banketing, and the initial coordinate of coloured steel ball before mark experiment, according to loading scheme mark steel ball position in process of the test, with this Confirming model test side displacement;
Described model test, after having filled, arrange coloured bearing cup by design pitch on fill slope, the fixed position outside described device is provided with camera, constantly takes coloured steel ball in process of the test, by image procossing Confirming model test displacement of inclined plane;
Described displacement measurement system uses steel wire displacement sensor, one end of wire rope is fixed on the displacement point to be measured of tire, the displacement measurement system at other end connection mode molding box rear portion, when displacement measurement system carries out displacement measurement, the pulling force that each measurement need be kept to apply wire rope is all identical.
Advantage of the present invention and beneficial effect are:
1. this test unit can carry out pull-out test, and can test by implementation model, improves the utilization factor of equipment, provides cost savings;
2. the strain of tire muscle material and the displacement of model side slope, measured by steel wire displacement method measurement system and microscope respectively, the accurate height of test figure;
3. vertical loading and horizontal addload operating process simply save time, and pressure and displacement data can accurately obtain simultaneously, can apply continual and steady pressure to model.
4., except can carrying out conventional reinforcement material experimental study, test and monitoring can be carried out for special muscle material, reflect stability and the deformation behaviour of special earth structure truly.
Accompanying drawing explanation
Fig. 1: be the cross-section structure sketch of the device of the embodiment of the present invention;
Fig. 2: be the structure diagram of the model framework main body of the device of the embodiment of the present invention;
Fig. 3: be the counterforce device beam framed structure sketch of the embodiment of the present invention;
Fig. 4: be the tire reinforcement pull-out test floor map of the embodiment of the present invention.
Embodiment
The technical program is further described below in conjunction with reference to accompanying drawing, the example of described embodiment is shown in the drawings, wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish, but this description is only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Ask for an interview Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the technical scheme that device of the present invention adopts is: the dual-purpose test unit of a kind of tire earth structure pull-out model test, comprises model system, loading system and measuring system, model system is made up of model casing and four counterforce devices 14, before and after model casing, two sides are made up of model framework main body, model framework main body is welded by four horizontal angle steel 21 and four vertical angle steel 22, model casing left and right sides and bottom surface embed horizontal angle steel 21 and vertical angle steel 22 inner seal by wooden form dividing plate, the hollow space vitreous model dividing plate 23 of model framework main body embeds horizontal angle steel 21 and vertical angle steel 22 inner seal, wooden form dividing plate and vitreous model dividing plate 23 for sash steel rib and steel rib reinforcement of vertically putting more energy into strengthen model equipment rigidity, four counterforce devices 14 are arranged in four counterforce device beam frameworks respectively, counterforce device beam framework is made up of four vertical beams, 18, two longerons 19 and three crossbeams 20, three crossbeams 20 are separately fixed at two ends and the centre of two longerons 19, and four vertical beams 18 are welded on the upper lateral angle steel 21 of two sides before and after model casing symmetrically, model casing medial surface is laid with tetrafluoroethylene or coating lubricant to reduce to banket and friction between sidewall, loading system comprises and vertically adds subsystems and horizontal addload subsystem, vertically add subsystems and comprise four hydraulic jacks 13 and load plate 15, load plate 15 is arranged on model casing inside, and hydraulic jack 13 is arranged in load plate 15, is positioned at counterforce device beam framework, reinforcement tire 17 reinforcement tire layer in series, the first bracing wire 161 that horizontal addload subsystem comprises drawing load application system 11 and is made by wire rope, drawing load application system 11 is connected with reinforcement tire 17 by bracing wire 161, applies horizontal loading, the second bracing wire 162 that measuring system comprises displacement measurement system 12 and is made by wire rope, displacement measurement system 12 is connected with reinforcement tire 17 by the second bracing wire 162, for measuring the displacement of the second bracing wire 162, steel wire loop is located in the little flexible pipe 24 of plastics, and in the little flexible pipe 24 of plastics, filling butter is to strengthen lubrication,
The technical scheme that method of the present invention adopts is: a kind of tire earth structure pullout strength measuring method, and the load of pull-out test and model test reads by pressure fuel pump table; The interior pressure of device is read by soil pressure cell; Side distortion of banketing in model test adopts trace labelling method to read, and domatic displacement adopts image acquisition method to read; In pull-out test, squeegee action adopts displacement measurement system to measure; Model test, in the process of filling, the vitreous model dividing plate 23 of model casing and arrange coloured steel ball between banketing, and the initial coordinate of coloured steel ball before mark experiment, according to loading scheme mark steel ball position in process of the test, with this Confirming model test side displacement; Model test, after having filled, arrange coloured bearing cup by design pitch on fill slope, the fixed position outside device is provided with camera, constantly takes coloured steel ball in process of the test, by image procossing Confirming model test displacement of inclined plane; Displacement measurement system uses steel wire displacement sensor, one end of wire rope is fixed on the displacement point to be measured of tire, the displacement measurement system at other end connection mode molding box rear portion, when displacement measurement system carries out displacement measurement, the pulling force that each measurement need be kept to apply wire rope is all identical.
The principle of work of device of the present invention is: vertical and horizontal addload all provides power by oil pressure pump, promote hydraulic jack 13 and produce stroke, be connected with counterforce device 14 bottom hydraulic jack 13 thus make lifting jack top promote vertical load plate 15 or pull reinforcement tire 17, oil pressure pump provides pressure to be read by tensimeter, and displacement is then read by displacement transducer.Meanwhile, the pressure cell buried underground in reinforced earth inside can read slope body internal pressure data.When carrying out model test, only have vertical hydraulic jack 13 to work, the pressure uniform that hydraulic jack 13 is passed to load plate 15 is applied in device on reinforced earth, makes the soil body produce sedimentation until destroy; When carrying out pull-out test, first vertical hydraulic jack 13 applies vertical pressure to setting value, and then drawing load application devices 11 work pulls tire, makes tire and bankets generation relative sliding.
The principle of work of method of the present invention is: arranged coloured steel ball in ramped surfaces before on-test, and a part in soil imbedded by steel ball, and at domatic placement steel ruler.After on-test, the camera of fixed position is adopted to load at every turn and taking pictures after stablizing.After having tested, different time is taken pictures and imports MATLAB, steel ball coordinate points is read after clicking coloured steel ball with mouse, the coordinate points of the same steel ball of time adjacent segments is utilized to calculate measuring point figure top offset, due to measuring point figure top offset and actual displacement linear, just can obtain actual displacement after figure top offset compares with length of the scale.
The present invention is when carrying out model test, in the space that wooden form dividing plate and glass model dividing plate 23 surround, according to setting packing, composition heap is built and is banketed and tamp, reinforcement tire 17 mutually colligation is also successively arranged after connecting, build in model process at heap and bury soil pressure cell underground in inside, at glass model dividing plate 23 with arrange coloured steel ball between banketing and indicate initial position on glass model dividing plate 23; After model has filled, arrange coloured steel ball in domatic side by constant spacing and lay a scale, having fixed position, side, slope lay camera and fix with tripod at model casing; Banketing, load plate 15 is steadily laid at top, provides power by oil pressure pump, and reads load pressure value by tensimeter, and the interior each measuring point pressure data that bankets is read by the pressure cell buried underground; After each loading is stable, coloured steel ball position, device side all once marks, and coloured steel ball of domatic layout is then taken camera operation by remote control, prevents from making camera position change; Loading terminates the rear position to adjacent twice mark of the coloured steel ball in device side and measures, and calculates its level and vertical displacement, coordinates tensimeter data just can draw slope load-displacement curve; The photo of coloured steel ball of domatic layout is imported in MATLAB, the coordinate of each measuring point is got respectively with mouse point, the coordinate same method of adjacent time same observation station obtains, relatively the coordinate limit of adjacent time same observation station just can calculate the figure top offset of measuring point, because figure top offset and the real displacement of measuring point and camera and domatic distance, camera tilt angles degree, the gradient of banketing are relevant, and it is linear, therefore measuring point figure top offset is linearly converted by spacing on the figure of scale, load-domatic displacement curve can be drawn thus.
The present invention is when carrying out pull-out test, step of banketing is basic identical with model test, reaching a certain height when banketing, the reinforcement tire 17 of mutually connecting being embedded in banketing, and by the first bracing wire 161, the most front-seat tire being connected with the crossbeam of drawing load application system 11; After model has filled, first make vertically have lifting jack 13 to produce stroke by oil pressure pump, produce even distributed force on surface of banketing after load is applied to load plate 15, read vertical load force value by tensimeter; After Vertical Load is stable, the hydraulic jack of drawing load application system 11 pulls the first bracing wire 161 to make tire produce displacement, by tensimeter read level payload values, by displacement transducer record lifting jack horizontal throw; One end of second bracing wire 162 is fixed on the displacement point to be measured of tire, periphery is the little flexible pipes 24 of plastics, soft casing pack butter is to strengthen lubrication, other end connection mode molding box rear shift measurement system 12, when reinforcement tire 17 deforms, before and after reinforcement tire 17, the difference of the shift value of measuring point is this reinforcement tire 17 deformation values.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a tire earth structure pullout strength measuring method is the method utilizing the dual-purpose test unit of tire earth structure pull-out model test to carry out the measurement of tire earth structure pullout strength, described device comprises model system, loading system and measuring system, described model system is made up of model casing and counterforce device (14), before and after described model casing, two sides are made up of model framework main body, described model framework main body is welded by four horizontal angle steel (21) and four vertical angle steel (22), described model casing left and right sides and bottom surface are by the horizontal angle steel (21) described in the embedding of wooden form dividing plate and vertical angle steel (22) inner seal, the horizontal angle steel (21) described in hollow space vitreous model dividing plate (23) embedding of described model framework main body and vertical angle steel (22) inner seal, described wooden form dividing plate and vitreous model dividing plate (23) for sash steel rib and steel rib reinforcement of vertically putting more energy into strengthen model equipment rigidity, described counterforce device (14) is arranged in counterforce device beam framework, described counterforce device beam framework is made up of four vertical beams (18), two longerons (19) and three crossbeams (20), three crossbeams (20) are separately fixed at two ends and the centre of two longerons (19), and four described vertical beams (18) are welded on the upper lateral angle steel (21) of two sides before and after described model casing symmetrically, described loading system comprises and vertically adds subsystems and horizontal addload subsystem, the described subsystems that vertically adds comprises hydraulic jack (13) and load plate (15), it is inner that described load plate (15) is arranged on described model casing, described hydraulic jack (13) is arranged in described load plate (15), is positioned at described counterforce device beam framework, described horizontal addload subsystem comprises drawing load application system (11) and the first bracing wire (161), and described drawing load application system (11) is connected with reinforcement tire (17) by described bracing wire (161), applies horizontal loading, described measuring system comprises displacement measurement system (12) and the second bracing wire (162), described displacement measurement system (12) is connected with reinforcement tire (17) by described the second bracing wire (162), for measuring the displacement of described the second bracing wire (162), it is characterized in that:
Described pull-out test and the load of model test read by pressure fuel pump table;
The interior pressure of described device is read by soil pressure cell;
Side distortion of banketing in described model test adopts trace labelling method to read, and domatic displacement adopts image acquisition method to read; In described pull-out test, squeegee action adopts displacement measurement system to measure;
Described model test, in the process of filling, the vitreous model dividing plate (23) of described model casing and arrange coloured steel ball between banketing, and the initial coordinate of coloured steel ball before mark experiment, according to loading scheme mark steel ball position in process of the test, with this Confirming model test side displacement;
Described model test, after having filled, arrange coloured bearing cup by design pitch on fill slope, the fixed position outside described device is provided with camera, constantly takes coloured steel ball in process of the test, by image procossing Confirming model test displacement of inclined plane;
Described displacement measurement system uses steel wire displacement sensor, one end of wire rope is fixed on the displacement point to be measured of tire, the displacement measurement system at other end connection mode molding box rear portion, when displacement measurement system carries out displacement measurement, the pulling force that each measurement need be kept to apply wire rope is all identical.
2. method according to claim 1, is characterized in that: described the first bracing wire (161), the second bracing wire (162) are wire rope.
3. method according to claim 2, is characterized in that: described steel wire loop is located in the little flexible pipe of plastics (24), and the interior filling butter of the little flexible pipe of described plastics (24) is to strengthen lubrication.
4. method according to claim 1, is characterized in that: described model casing medial surface is laid with tetrafluoroethylene or coating lubricant to reduce to banket and friction between sidewall.
5. method according to claim 1, is characterized in that: described reinforcement tire (17) reinforcement tire layer in series.
6. method according to claim 1, is characterized in that: described counterforce device (14), counterforce device beam framework, hydraulic jack (13) are provided with four.
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| CN104198276B (en) * | 2014-08-25 | 2017-01-18 | 广西科技大学 | Large visual drawing test device for geosynthetics |
| CN104198301B (en) * | 2014-09-16 | 2017-06-20 | 广西科技大学 | Reinforced earth visualization large-sized model direct shear test number adopts instrument |
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| CN106442108A (en) * | 2016-09-30 | 2017-02-22 | 山东大学 | Discarded tire sheet body shearing strength testing device and method |
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| CN110044725B (en) * | 2019-03-21 | 2020-10-02 | 同济大学 | Method for acquiring drawing mechanical behavior of planar rib-soil interface |
| CN110186369B (en) * | 2019-05-20 | 2021-04-13 | 河海大学 | Experimental device and method for detecting strain of reinforced ring in reinforced soil structure |
| CN111829894B (en) * | 2020-06-24 | 2022-02-08 | 山东大学 | Rock-soil multi-field measurement test system and method |
| CN111766164B (en) * | 2020-08-07 | 2021-04-20 | 中冶建筑研究总院有限公司 | Fatigue-stress relaxation testing device for prestressed tendon |
| CN114018706B (en) * | 2021-11-09 | 2022-08-30 | 长沙学院 | Method for carrying out bearing capacity and drawing test of tire reinforced soil foundation by using same device |
| CN114034558B (en) * | 2021-11-09 | 2022-09-13 | 长沙学院 | Device capable of developing bearing capacity of tire reinforced soil foundation and tire drawing test |
| CN114166658B (en) * | 2021-12-07 | 2024-04-12 | 长沙学院 | Method for testing shear characteristics of vertical interface of junked tire and soil |
| CN114166659B (en) * | 2021-12-07 | 2024-04-12 | 长沙学院 | Junked tire-soil vertical interface shear characteristic testing arrangement |
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