CN107315082A - A kind of many depression door model assay systems of three-dimensional array type - Google Patents
A kind of many depression door model assay systems of three-dimensional array type Download PDFInfo
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- CN107315082A CN107315082A CN201710608508.3A CN201710608508A CN107315082A CN 107315082 A CN107315082 A CN 107315082A CN 201710608508 A CN201710608508 A CN 201710608508A CN 107315082 A CN107315082 A CN 107315082A
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- outer framework
- lifting platform
- dimensional array
- array type
- assay systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a kind of many depression door model assay systems of three-dimensional array type, including outer framework, the outer inframe is provided with the stuffing box for filling material, the stuffing box bottom is provided with many depressions door component of Bit andits control component control, many depressions components include the height-adjustable lifting platform that some arrays are arranged, GSZ mounting assembly is provided with many depressions components, the surface displacement measurement assembly that the change of material top profile is filled out for measuring is provided with the top of outer framework, the cross section displacement visualization measurement component that material section metamorphosis is filled out for measuring is provided with front side of the outer framework.Whole system can realize the simulation to vertical soil arching effect, filler deformation and the simulation of load transport phenomena in the Piled Embankments that are particularly suitable for use in, composite foundation bed course under the non-uniform sink conditions of inter-pile soil.
Description
Technical field
The present invention relates to a kind of geotechnological layer during similar model test system, in particular to a kind of many depression door models of three-dimensional array type
Pilot system.
Background technology
Soil arching effect is a kind of load transport phenomena in Geotechnical Engineering, by the performance of shear stress by load to rigid side
Boundary is concentrated, and differential deformation is the main cause of caused shear stress.By taking Piled Embankments as an example, due to stake, clay model amount difference,
Under vertical uniform load q, inter-pile soil generates the settling amount more than pile body, forms differential settlement in stake top portion, causes upper load to exist
Redistribution is produced between stake and inter-pile soil, more loads are delivered to stake top portion.Sink to simulating relative settlement by depression door
Mode can result in load and naturally concentrated to pile body, the analog form being pierced into compared to pile body, with pile formula in Practical Project
Embankment working mechanism is more identical.Single depression door experimental rig that Terzaghi was developed under plane strain condition in 1936,
For explaining the phenomenon that stress is migrated to rigid boundary.The experiment of depression door is reasonable for the simplification of soil arching effect problem, extensively
In experiment applied to similar engineerings such as Piled Embankments, karst collapse, avalanche exploitations, with field test and numerical simulation not
Alternative advantage.
Depression door pilot system have passed through from plane strain list depression door to plane strain many depressions door and three-dimensional single depression
The evolution of door pilot system.Current threedimensional model experiment can not consider influencing each other between multiple depressions doors mostly,
Visualization is relatively low, and internal modification is difficult to direct acquisition with stress, while relative shift can not be controlled accurately.
The content of the invention
The present invention aiming at the deficiencies in the prior art there is provided three-dimensional array type many depressions door model assay systems, can
To realize the simulation to vertical soil arching effect, the Piled Embankments that are particularly suitable for use in, composite foundation bed course are in the case where inter-pile soil is non-uniform
Filler deformation and the simulation of load transport phenomena under the conditions of heavy.
To achieve these goals, many depression door model assay systems of three-dimensional array type designed by the present invention, its is special
Part is：Including outer framework, many depressions door component, Bit andits control component, stuffing box, GSZ mounting assembly, surface position
Shift measurement component and cross section displacement visualization measurement component,
The stuffing box is located inside outer framework, is transparence for loading on front side of filler, and the stuffing box；
Many depression door components are located at stuffing box bottom, include the height-adjustable lifting platform of some arrays arrangement；
The Bit andits control component is for controlling velocity of displacement and interval time of the lifting platform of array in many depressions doors by setting
Decline, produce non-uniform sinking；
The GSZ component is located on many depressions door component, for installing fixed Fill Reinforced With Geogrids material when experiment needs
Material；
The surface displacement measurement assembly is located at the top of outer framework, the top for filling out material during lifting platform decline for measuring
Portion's metamorphosis；
The cross section displacement visualization measurement component is located on front side of outer framework, and material section whole audience displacement is filled out for measuring.
Further, the stuffing box is made up of the baffle plate and outer framework bottom plate of outer framework surrounding, wherein, on front side of outer framework
Baffle plate is organic glass baffle, and both sides and rear side baffle are spliced by multistage.It is convenient that front side is set to organic glass baffle
Observation, the baffle design of both sides and rear side is the baffle plate that multistage is spliced under upper, is conveniently filled.
Further, the outer framework both sides and rear side baffle are spliced by multistage steel bar.
Yet further, the lifting platform is to be provided with loadometer at the top of ball screw lifting platform, and the lifting platform, institute
State loadometer size identical with lifting platform top plate size.The loadometer testing element typically uses radial weighing sensor,
For testing the load that filler is delivered on every piece of lifting platform, to assess the performance degree of soil arching effect.
Yet further, the lifting platform array way of the lifting platform component preferably 16 × 16.5 kinds of different pile covers can be achieved
Area replacement ratio packed height relative with 4 kinds combines down the deformation pattern type being likely to occur.
Yet further, the GSZ mounting assembly includes on front side of GSZ, the GSZ and stuffing box
To be flexibly connected between front glass baffle plate, to meet the boundary condition requirement of front side section, remaining side is and outer framework
It is fixedly connected.
Yet further, correspondence grid is set on fixed chute, the outer framework both sides and rear side on the glass baffle plate
It is provided with grid and fixes girder steel, remaining side of the GSZ is fixed on grid by grid press strip and fixed on girder steel.
Yet further, the surface displacement measurement assembly includes laser cross section instrument and the cunning slided for laser cross section instrument
Dynamic structure, the slide construction is fixed in the chute at the top of outer framework.Laser cross section instrument is facilitated to move back and forth, thing is filled out in measurement
Metamorphosis at the top of material.
Yet further, the cross section displacement visualization measurement component includes lighting system and camera device.
Yet further, the filled out material is the granular media sandstone material of different colours placement in layers, and the mode of filling is,
Weight void paving first is filled according to calculating, predetermined floor height is depressed into after striking off.So as to which the field density to filler is controlled, fill out
Build density and refer to the relative density of sand or the compactness of cohesive soil.
The advantage of the invention is that：Its depression door is using adjustable for height array lifting platform combination, depression door motion
Pattern is adjusted by Bit andits control component, deflection can be controlled accurately；And it is provided with surface displacement measurement assembly, and section
Displacement visualization measurement component so that cross section displacement can be followed the trail of, surface displacement can be measured.The present invention is realized under three-dimensional condition
The simulation of Piled Embankments, composite foundation bed course the filler course of work in the non-uniform sinking/deformation of inter-pile soil and GSZ,
And obtain soil arch evolution overall process deformation and the accurate data of stress.
Brief description of the drawings
Fig. 1 is the overall structure figure of the present invention；
Fig. 2 is the plan of the present invention；
Fig. 3 is the arranged in squares mode of many depression doors；
Fig. 4 is many depression door quincuncial arrangement modes；
The motion control pattern of lifting platform when Fig. 5 is for many depressions door arranged in squares；
The motion control pattern of lifting platform when Fig. 6 is for many depressions door quincuncial arrangement.
In figure：Outer framework 1, bottom plate 2, grid are fixed girder steel 3, front apron 4, rear/side shield 5, lifting platform 6, grid and fixed
Chute 7, loadometer 8, laser cross section instrument chute 9, displacement controller 10, computer 11, grid fix press strip 12, light 13, shooting
Device 14, figure section line shadow representation does not produce the fixed plate of sinking, and Fig. 5 represents that lifting platform is different with the numeral in Fig. 6
Motor pattern.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
The many depression door model assay systems of a kind of three-dimensional array type shown in figure, it is possible to achieve to the mould of vertical soil arching effect
Intend, the filler deformation under the non-uniform sink conditions of inter-pile soil and load in the Piled Embankments that are particularly suitable for use in, composite foundation bed course
The simulation of transport phenomena.
The pilot system includes experimental rig outer framework 1, many depressions door component, Bit andits control component, stuffing box, Tu Gongge
Grid mounting assembly, surface displacement measurement assembly and cross section displacement visualization measurement component are constituted.Wherein many depressions door components by
The precision ball screw lifting platform 6 of array arrangement is constituted, and each lifting platform 6 can be secured by bolts in the bottom plate of outer framework 1
On.Bit andits control component includes displacement controller 10 and computer 11, lifting platform 6 by connecting displacement controller 10 and computer 11,
It can control the motor pattern of each lifting platform 6 so that many depression doors of array produce non-uniform sinking, non-to inter-pile soil to realize
Uniform sinking and the simulation of geogrid deformation.Stuffing box is made up of the baffle plate and outer framework bottom plate of outer framework surrounding, wherein,
Stuffing box front apron 4 uses organic glass baffle, and both sides and rear side baffle 5 are spliced using the segmentation steel bar under upper,
To coordinate placement in layers filler.Filler can be layered and pressed using filling materials such as sandstone, clays using different colours placement in layers
It is real.Stuffing box can be positioned below GSZ mounting assembly, and GSZ mounting assembly is located on many depressions door component, in order to protect
The lateral spacing strain boundary condition of displacement measurement section is demonstrate,proved, the corresponding grid of GSZ is specially provided with organic glass baffle
Fixed chute 7, grid fixed chute 7 is typically designed as kidney ellipsoid, and its excess-three face of GSZ is fixed press strip 12 using grid and consolidated
It is scheduled on grid to fix on girder steel 3, grid is fixed girder steel 3 and is arranged on outer framework 1.The top of outer framework 1 is provided with laser cross section instrument
Chute 9, the slide construction for laser cross section instrument is slided, so as to carry out filler surface displacement scanning.The deformation of section filler passes through
Cross section displacement visualization measurement component is gathered, and cross section displacement visualization measurement component includes lighting system 13 and camera device 14,
Collect particle image velocimetry PIV technologies can be used to catch particle displacement after consecutive image, and be obtained by image analysis software
Particle corner, Density Distribution and slip-crack surface form, carry out filler deformation and soil arching effect EVOLUTION ANALYSIS.
As the preferred structure of the present invention, the size of testing fill case length × width × height is the m of the m of 2.4 m × 2.4 × 1.5,
Geometric similarity constant is controlled 1:4 or so.
As the preferred structure of the present invention, lifting platform 6 uses 16 × 16 array ways in described many depressions door component, can
Realize that 5 kinds of different pile cover area replacement ratios packed height relative with 4 kinds combines down the simulation for the deformation pattern type being likely to occur.
As the preferred structure of the present invention, many depression door components use precision ball screw lifting platform 6, and each lifting platform is matched somebody with somebody
Planetary reducer and driving stepper motor are had, and control card is installed, displacement controller 10 is connected by control card.Lifting platform 6
Preferred parameter is：The mm of the mm of planar dimension 150 × 150, the mm of Bit andits control precision 0.01, the design mm of range 150, can be
Independently moving is realized in the control of displacement controller 10, realizes the simulation to inter-pile soil and the non-uniform sinking of grid.
As the preferred structure of the present invention, the top of lifting platform 6 is provided with equidimension loadometer 8, and loadometer 8 uses radial
Weighing sensor, can accurately measure load, internal pressure and GSZ can be using soil pressure cell and grid strain measurements
Amount, quantity is arranged according to actual needs with position.
Depression door combination of the present invention is adjustable, depression door motor pattern can be programmed control, deflection can be accurate
Control, cross section displacement can be followed the trail of, surface displacement can be measured.Piled Embankments under three-dimensional condition, composite foundation can be realized
The simulation of bed course filler course of work in the non-uniform sinking/deformation of inter-pile soil and GSZ, and obtain the full mistake of soil arch evolution
Journey deforms the accurate data with stress.
A kind of depression door arrangement form is selected in figs. 3 and 4.Using the dyeing filler placement in layers of different colours, lead to
Cross every layer and fill Weight control sand relative density or clay compactness.Rear can be mono- section point by 100 mm with two side shields 5
Section is installed, and fills weight void paving according to what is precalculated every time, 100 mm are depressed into after striking off.When carrying out reinforcement experiment, visually
Change and be fixed on GSZ in fixed chute 7 by root in section, its excess-three face fixes press strip 12 using grid and is fixed on grid
On fixed girder steel 3.After the completion of filling, array lifting platform 6 is controlled to produce Fig. 5 or figure using displacement controller 10 and software kit
Numeral in subsidence pattern shown in 6, Fig. 5 or Fig. 6 represents that lifting platform uses different decrease speeds and interval time.
Overall process picture is gathered by light 13 and camera device 14, particle displacement vector is followed the trail of using PIV technologies, used
Image processing software processing obtains particle displacement distribution, Density Distribution and shear slip plane, directly perceived to differentiate cross section deformation feature；
Using laser cross section instrument real time scan filler surface displacement fixed on laser section chute 9 in many depression door sinking watchings.Examination
Test after end, carry out demixing scan, obtain inside filler, the displacement of bed course and grid layer；Can be using the test of miniature soil pressure cell
Internal stress, the load that filler is delivered on lifting platform is accurately determined using full-scale load plate 8；Bed course influences to test with reinforcement
In, can be using the measurement grid strain of grid strain gauge.
The foregoing is merely illustrative of the preferred embodiments of the present invention, does not do any formal limitation to the present invention, appoints
What is familiar with any modification, equivalent variations and improvement that those skilled in the art are made within the spirit and principles in the present invention
Deng, should be included in protection scope of the present invention within.
Claims (10)
1. a kind of many depression door model assay systems of three-dimensional array type, it is characterised in that：Including outer framework, many depressions door component,
Bit andits control component, stuffing box, GSZ mounting assembly, surface displacement measurement assembly and cross section displacement visualization measurement
Component,
The stuffing box is located inside outer framework, for being transparence on front side of filler, and the stuffing box；
Many depression door components are located at stuffing box bottom, include the height-adjustable lifting platform of some arrays arrangement；
The Bit andits control component is used to control the lifting platform of array in many depression doors to produce non-uniform sinking；
The GSZ component is located on many depressions door component, for installing fixed Fill Reinforced With Geogrids material when experiment needs
Material；
The surface displacement measurement assembly is located at the top of outer framework, the top for filling out material during lifting platform decline for measuring
Portion's metamorphosis；
The cross section displacement visualization measurement component is located on front side of outer framework, and material section whole audience displacement is filled out for measuring.
2. many depression door model assay systems of three-dimensional array type according to claim 1, it is characterised in that：The stuffing box
It is made up of the baffle plate and outer framework bottom plate of outer framework surrounding, wherein, baffle plate is glass baffle plate, both sides and rear side gear on front side of outer framework
Plate is spliced by multistage.
3. many depression door model assay systems of three-dimensional array type according to claim 2, it is characterised in that：The outer framework
Both sides and rear side baffle are spliced by multistage steel bar.
4. many depression door model assay systems of three-dimensional array type according to claim 3, it is characterised in that：The lifting platform
To be provided with loadometer, the loadometer size and lifting platform top plate size at the top of ball screw lifting platform, and the lifting platform
It is identical, for testing the load that filler is delivered on every piece of lifting platform, to assess the performance degree of soil arching effect.
5. many depression door model assay systems of three-dimensional array type according to claim 4, it is characterised in that：The lifting platform
From 16 × 16 lifting platform array way.
6. many depression door model assay systems of three-dimensional array type according to claim 5, it is characterised in that：The geotechnological lattice
Grid mounting assembly is included on front side of GSZ, the GSZ with being flexibly connected between stuffing box front glass baffle plate, with
The boundary condition requirement of front side section is met, remaining side is fixedly connected with outer framework.
7. many depression door model assay systems of three-dimensional array type according to claim 6, it is characterised in that：The glass gear
Correspondence grid, which is set, on plate is provided with grid fixation girder steel, the geotechnological lattice on fixed chute, the outer framework both sides and rear side
Remaining side of grid is fixed on grid by grid press strip and fixed on girder steel.
8. many depression door model assay systems of three-dimensional array type according to claim 7, it is characterised in that：The surface position
Shift measurement component includes laser cross section instrument and the slide construction slided for laser cross section instrument, and the slide construction is fixed on housing
In the chute of top of the trellis.
9. many depression door model assay systems of three-dimensional array type according to claim 8, it is characterised in that：The section position
Moving visualization measurement component includes lighting system and camera device.
10. many depression door model assay systems of three-dimensional array type according to claim 9, it is characterised in that：It is described to be filled out
Material is the granular media sandstone material of different colours placement in layers, and the mode of filling is first to fill weight void paving according to calculating, scrape
Predetermined floor height is suppressed after flat.
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| CN107748135A (en) * | 2017-12-06 | 2018-03-02 | 山东大学 | Soil arching effect probes into device and test method under a kind of more displacement models |
| CN108343101A (en) * | 2018-03-30 | 2018-07-31 | 山东大学 | A kind of experimental rig and method of TGXG disposition widening subgrade reinforcement effects |
| CN112344906A (en) * | 2020-11-30 | 2021-02-09 | 山东大学 | Unstable-subsidence coal mining subsidence area ship pool settlement deformation model test device and method |
| CN115343448A (en) * | 2022-10-18 | 2022-11-15 | 湖南大学 | Novel movable door model test device and method based on soil arch effect research |
| CN115538404A (en) * | 2022-12-01 | 2022-12-30 | 中国科学院、水利部成都山地灾害与环境研究所 | Dynamic circulation load lower pile net structure load sharing test device and test method thereof |
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| CN115343448A (en) * | 2022-10-18 | 2022-11-15 | 湖南大学 | Novel movable door model test device and method based on soil arch effect research |
| CN115343448B (en) * | 2022-10-18 | 2023-03-17 | 湖南大学 | Novel movable door model test device and method based on soil arch effect research |
| CN115538404A (en) * | 2022-12-01 | 2022-12-30 | 中国科学院、水利部成都山地灾害与环境研究所 | Dynamic circulation load lower pile net structure load sharing test device and test method thereof |
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