CN105675239A - Test soil box of high-gravity-field vibration table - Google Patents
Test soil box of high-gravity-field vibration table Download PDFInfo
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- CN105675239A CN105675239A CN201610032281.8A CN201610032281A CN105675239A CN 105675239 A CN105675239 A CN 105675239A CN 201610032281 A CN201610032281 A CN 201610032281A CN 105675239 A CN105675239 A CN 105675239A
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- bar
- sidepiece
- base plate
- test soil
- gravity field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
Abstract
The invention discloses a test soil box of a high-gravity-field vibration table. Two side plates are vertically fixed at the left and right sides of a base plate respectively in a symmetrical manner, each side plate is provided with multiple lateral strips, the lateral strips are arranged up and down and move along the front and back direction of the base plate to form a lateral frame, each of the front and back sides of the base plate is provided with multiple end strips in the outer side, the end strips are arranged up and down and are movably connected to form an end frame, connecting rods are connected between the tops of the side plates, and metal sheets are arranged from the internal surfaces of the end frames to the bottom surface of the base plate. According to the invention, a model of the limited size can be used to simulate dynamic response of soil in a semi-infinite place, and the soil box is characterized by low weight, simple structure, convenient use and good test effect.
Description
Technical field
The present invention relates to the native case of a kind of civil engineering test, especially relate to a kind of super gravity field shaketalle test soil case.
Background technology
In practical situations both, foundation soil body can be considered semi-infinite half-space place, but in super gravity field shaking table model, the native case of finite size can only be used to carry out the die-filling type soil body, and the existence of soil case is equivalent to artificially be provided with border to the soil body. Therefore, native case in model test have to meet some requirements and could simulate place prototype better: end boundaries should can be considered shear beam, in test should keep concordance with the deformation of the internal soil body, reduce the compressional wave because the interaction between end boundaries and the soil body excites; End boundaries should have identical roughness with the soil body, to provide vertical shear stress on soil boundary, it is prevented that the generation of tilting moment, it is to avoid cause the inside soil body stress redistribution relative to prototype; Casing CENTRIFUGAL ACCELERATING and vibration in should without lateral strain, to meet soil body earth pressure at rest state, it is to avoid because of caused by soil body lateral expansion the soil body settle and cubic deformation.
Present stage vibration test soil case mainly has rigid box, cylindrical shape flexible box, laminar shear case.
The rigid container that rigid box is made up of steel plate or lucite, because its rigidity is relatively big, reflecting it is also obvious that in order to absorb the energy arriving at lateral boundaries, rigid box often pastes flexible material on chamber interior wall vibration wave. But, under the high-stress state in centrifuge test, the character such as the frictional force of flexible material and rigidity is difficult to determine; Flexible material will inevitably result from lateral deformation in vibration test, and the soil body will be unable to meet earth pressure at rest state.
Cylinder type flexible container is made up of a flexible material, is shaped like cylindrical shape, and its lower end is fixed on steel plate, and upper end is fixed by steel annulus, and flexible material outer wrapping fiber band or steel wire provide radial rigidity. But, the Boundary Stiffness of container cannot directly be controlled by flexible box, easy outward expansion when the soil body of outer wrapping fiber interband vibrates, and causes strain to concentrate, causes the release of confining pressure; Flexible box inner surface is smooth, it is impossible to provide shear stress vertical on border; Bigger depth-width ratio regular meeting causes experimental condition closer to three-dimensional boundaries.
Laminar shear case is generally the some layers of rectangle plane steel frame folded interlayer that is incorporated in from down to up and places bearing and make, between rectangle plane steel frame can relative sliding to simulate soil detrusion.Both the above soil case compared by laminar shear case, to native detrusion almost without constraint, decreases the border reflection to ripple. Again because have employed rigid frame, the soil body being had good lateral restriction, limits the lateral deformation of the soil body. But the laminar shear case that present stage research uses still suffers from following weak point: (1) laminar shear case exists the relative changing of the relative positions at interlayer, it is impossible to provides continuous print displacement on soil boundary, the USING A LOCAL STRESS-STRAIN caused on soil boundary is concentrated; (2) framework shearing case is superimposed with each other either directly through roller bearing between layers, if bottom interlayer slides and alignment goes wrong, also will directly affect the motion of upper box rack-layer; (3) cabinet wall is smooth, it is impossible to provides shear stress vertical on border, will inevitably cause the inside soil body stress redistribution relative to prototype.
Summary of the invention
In order to overcome the deficiency in background technology, it is an object of the invention to provide a kind of super gravity field shaketalle test soil case, casing is absent from the relative changing of the relative positions between layers borderline, boundary displacement is continuous, the slip of bottom interlayer and alignment issues will not directly affect the motion of upper layer, cabinet wall is rough provides vertical shear stress, to overcome the deficiency of above-mentioned existing soil case.
The technical solution used in the present invention is:
The present invention includes base plate, side plate, sidepiece frame and end frame and constitutes, two blocks of side plates are vertically fixed in difference base plate arranged on left and right sides symmetrically, the side plate of base plate arranged on left and right sides is provided with multilamellar sidepiece bar, multilamellar sidepiece bar is arranged up and down and forms sidepiece frame along base plate fore-and-aft direction activity, on the both sides, front and back of base plate, outside is provided with multilamellar end bar, multilamellar end bar is flexibly connected mutually up and down and forms end frame, connecting connecting rod between the top of side plate, the inner surface of end frame extends to the bottom surface of base plate and is equipped with sheet metal.
The symmetrical medial surface of described two blocks of side plates is equipped with along the parallel multiple tracks bar-shaped trough of base plate fore-and-aft direction, each bar-shaped trough is provided with sidepiece bar, hollow in the middle part of sidepiece bar, it is provided with strip channel in the middle part of sidepiece bar, being connected by guide rail roll structure between sidepiece with bar-shaped trough up and down in the middle part of sidepiece bar so that sidepiece bar is in the bar-shaped trough movement along base plate fore-and-aft direction.
In the middle part of described end bar, hollow is provided with strip channel, and strip channel is built with a metallic rod, and metallic rod two ends are fixedly attached on sidepiece bar after strip channel.
Described end bar upper top is provided with strip groove, bottom face is provided with and coordinates the raised line embedded with strip groove, it is embedded in adjacent lower end bar strip groove by either end bar raised line, each end bar is sequentially connected with, and nethermost end bar raised line is embedded in the strip groove having on base plate.
Described sidepiece bar is identical with the number of plies of end bar, and the sidepiece bar of every layer is identical with end bar height.
Described sheet metal can be had mercy on song, incompressible and extend.
The medial surface of described sheet metal is matsurface, and its roughness is identical with the roughness of tested inside soil body, is coated with lubricating oil between sheet metal and soil case end frame.
Described side plate outer surface is provided with multiple rectangular recess for reducing quality.
The invention have the advantages that:
(1) sidepiece bar and end bar are hollow-core construction, thus alleviating the quality of whole chest, it is possible to minimize the lateral inertia force that the soil body is produced by soil case quality.
(2) soil case has enough rigidity, and top is provided with connecting rod, and casing is not susceptible to lateral drum deformation so that model clay body disclosure satisfy that the condition of zero lateral deformation.
(3) soil case end can Free Transform, to soil detrusion almost without constraint, the concordance with soil deformation can be kept, reduce the generation of compressional wave.
(4) end bar can rotate relatively freely between layers, it is possible to provide boundary displacement continuous print deforms, and reduces the soil disturbance of framework interlayer.
(5) every layer of sidepiece bar can independently of each other in the groove of side plate slidably, it is therefore prevented that the impact that upper box rack-layer is moved by the slip of bottom interlayer and alignment issues.
(6) sheet metal rough inner surface, it is possible to provide shear stress vertical on border, it is to avoid cause the inside soil body stress redistribution relative to prototype.
Accompanying drawing explanation
Fig. 1 is normal axomometric drawing.
Fig. 2 is Facad structure half sectional view of the present invention.
Fig. 3 is A-A face sectional view.
Fig. 4 is end and sidepiece bar connection diagram.
Fig. 5 is end bar interlayer connection diagram.
Fig. 6 is that the present invention tests schematic diagram.
Fig. 7 is the experiment effect comparison diagram of laminar shear case and the present invention.
In figure: 1, base plate, 2, side plate, 3, sheet metal, 4, sidepiece bar, 5, end bar, 6, metallic rod, 7, guide rail roll structure, 8, connecting rod.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Such as Fig. 1, Fig. 2, shown in Fig. 3, the present invention includes base plate 1, side plate 2, sidepiece frame and end frame are constituted, sidepiece frame and end frame can adopt aluminum alloy materials, two blocks of side plates 2 are vertically fixed on base plate 1 left side respectively symmetrically, on right both sides, base plate 1 is left, the side plate 2 of right both sides is provided with four layers of sidepiece bar 4, four layers of sidepiece bar about 4 are arranged and form sidepiece frame along base plate 1 fore-and-aft direction activity, on the both sides, front and back of base plate 1, outside is provided with four layers of end bar 5, four layers of end bar about 5 are flexibly connected formation end frame mutually, the sidepiece bar 4 of every layer is highly identical with end bar 5, the connecting rod 8 for preventing the lateral deformation of casing in centrifuge test is connected between the top of side plate 2, the inner surface of end frame extends to the bottom surface of base plate 1 and is equipped with sheet metal 3.
As shown in Figure 1, Figure 3, side plate 2 outer surface of rigidity has multiple rectangular recess, to reduce the quality of soil case, the symmetrical medial surface of two blocks of side plates 2 is equipped with along the parallel four road bar-shaped troughs of base plate 1 fore-and-aft direction, each bar-shaped trough is provided with sidepiece bar 4, hollow in the middle part of sidepiece bar 4, is provided with strip channel in the middle part of sidepiece bar 4, being connected by guide rail roll structure 7 between sidepiece with bar-shaped trough up and down in the middle part of sidepiece bar 4; Guide rail roll structure 7 includes the ball being separately mounted to install between sidewall and bar-shaped trough inwall upper rail and guide rail in the middle part of sidepiece bar 4, ball is embedded in guide rail and is formed is slidably connected, and the sidepiece bar 4 of every layer can move along base plate 1 fore-and-aft direction at bar-shaped trough independently.
As shown in Figure 3 and Figure 5, end bar 5 upper top is provided with strip groove, and bottom face is provided with and coordinates the raised line embedded with strip groove, is embedded in adjacent lower end bar 5 strip groove by either end bar 5 raised line, each end bar 5 is sequentially connected with, to realize relatively rotating of end bar interlayer. Nethermost end bar 5 raised line is embedded on base plate 1 in the strip groove having, and uppermost end bar 5 upper top is plane, is not provided with strip groove.
As shown in Figure 4, in the middle part of end bar 5, hollow is provided with strip channel, strip channel is built with a metallic rod 6, and the metallic rod 6 in the bar of end passes part after strip channel and can be inserted into sidepiece bar 4 with in the aperture of diameter, to allow freely rotatable relative to sidepiece bar 4 of end bar 5.
As shown in Fig. 1, Fig. 3 and Fig. 5, soil case terminal interior surface is with sheet metal 3, sheet metal 3 extends and is fixed on soil box plate 1, between sheet metal 3 and soil case end frame 5, coating lubricating oil is to allow end frame 5 and the relative displacement of sheet metal 3, before experiment, soil particle used by sheet metal 3 inner surface adherence test, makes soil case terminal interior surface coarse.
As shown in Figure 6, in laminar shear case and the present invention, fill the dry silica sand of 50cm height respectively, outside soil sample medio and together height casing, be respectively mounted accelerometer A1 and A2. Being lifted on vibration table by two soil casees respectively, make soil case be subject to sine wave oscillations and continue 10s, data obtain in laminar shear case and the present invention acceleration response spectrum respectively such as Fig. 7 after processing.
Be can be seen that by (a) and (b) in Fig. 7, laminar shear case is discontinuous due to border relative storey displacement, and the reasons such as shear stress vertical on border cannot be provided, under normal working frequency (T < 1s), inside and outside casing, acceleration also exists comparatively significantly difference; And the acceleration outside casing of the present invention almost keeps consistent completely with internal acceleration response spectrum, reflect that the boundary effect that the present invention causes for the soil body is minimum, place prototype can be simulated better.
As can be seen here, the present invention can pass through the soil body on the modeling semo-infinite place of finite size, has light weight, simple structure, and application is convenient, and test effect well waits prominent significant technique effect. Above-mentioned detailed description of the invention is used for illustrating the present invention, rather than limits the invention, in the spirit and scope of the claims of the present invention, and any amendment that the present invention is made and change, both fall within protection scope of the present invention.
Claims (7)
1. a super gravity field shaketalle test soil case, it is characterized in that: include base plate (1), side plate (2), sidepiece frame and end frame are constituted, two pieces of side plates (2) are vertically fixed on base plate (1) left side with being respectively symmetrically, on right both sides, base plate (1) is left, the side plate (2) of right both sides is provided with multilamellar sidepiece bar (4), multilamellar sidepiece bar (4) is arranged up and down and forms sidepiece frame along base plate (1) fore-and-aft direction activity, on the both sides, front and back of base plate (1), outside is provided with multilamellar end bar (5), multilamellar end bar (5) is flexibly connected mutually up and down and forms end frame, connecting rod (8) is connected between the top of side plate (2), the inner surface of end frame extends to the bottom surface of base plate (1) and is equipped with sheet metal (3).
2. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterized in that: the medial surface that described two pieces of side plates (2) are symmetrical is equipped with along the parallel multiple tracks bar-shaped trough of base plate (1) fore-and-aft direction, each bar-shaped trough is provided with sidepiece bar (4), hollow in sidepiece bar (4) middle part, sidepiece bar (4) is provided with strip channel in middle part, being connected by guide rail roll structure (7) between sidepiece with bar-shaped trough up and down of sidepiece bar (4) middle part, make sidepiece bar (4) in the bar-shaped trough movement along base plate (1) fore-and-aft direction, described end bar (5) middle part hollow is provided with strip channel, and strip channel is built with a metallic rod (6), and metallic rod (6) two ends are fixedly attached on sidepiece bar (4) after strip channel.
3. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterized in that: described end bar (5) upper top is provided with strip groove, bottom face is provided with and coordinates the raised line embedded with strip groove, it is embedded in adjacent lower end bar (5) strip groove by either end bar (5) raised line, each end bar (5) is sequentially connected with, and nethermost end bar (5) raised line is embedded on base plate (1) in the strip groove having.
4. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterized in that: described sidepiece bar (4) is identical with the number of plies of end bar (5), the sidepiece bar (4) of every layer is highly identical with end bar (5).
5. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterised in that: described sheet metal (3) can be had mercy on song, incompressible and extend.
6. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterized in that: the medial surface of described foil (3) is matsurface, its roughness is identical with the roughness of test inside soil body, is coated with lubricating oil between foil (3) and soil case end frame (5).
7. a kind of super gravity field shaketalle test soil case according to claim 1, it is characterised in that: described side plate (2) outer surface is provided with multiple rectangular recess for reducing quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610032281.8A CN105675239B (en) | 2016-01-18 | 2016-01-18 | A kind of super gravity field shaketalle test soil case |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610032281.8A CN105675239B (en) | 2016-01-18 | 2016-01-18 | A kind of super gravity field shaketalle test soil case |
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| CN105675239A true CN105675239A (en) | 2016-06-15 |
| CN105675239B CN105675239B (en) | 2017-11-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300055A (en) * | 2016-08-31 | 2017-01-04 | 国网山东省电力公司蓬莱市供电公司 | A kind of switch cubicle |
| CN107664290A (en) * | 2017-09-14 | 2018-02-06 | 上海小糸车灯有限公司 | A kind of concentrator and its automobile-used optical system |
| CN111442890A (en) * | 2020-04-30 | 2020-07-24 | 天津大学 | Vibrating table soil testing box |
| CN112690829A (en) * | 2020-12-15 | 2021-04-23 | 重庆医科大学附属第二医院 | Collector for accurately collecting urine samples |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300055A (en) * | 2016-08-31 | 2017-01-04 | 国网山东省电力公司蓬莱市供电公司 | A kind of switch cubicle |
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| CN107664290A (en) * | 2017-09-14 | 2018-02-06 | 上海小糸车灯有限公司 | A kind of concentrator and its automobile-used optical system |
| CN111442890A (en) * | 2020-04-30 | 2020-07-24 | 天津大学 | Vibrating table soil testing box |
| CN112690829A (en) * | 2020-12-15 | 2021-04-23 | 重庆医科大学附属第二医院 | Collector for accurately collecting urine samples |
| CN112690829B (en) * | 2020-12-15 | 2023-04-07 | 重庆医科大学附属第二医院 | Collector for accurately collecting urine samples |
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