CN111855120A - Suspended layered shearing model box device - Google Patents
Suspended layered shearing model box device Download PDFInfo
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- CN111855120A CN111855120A CN202010738715.2A CN202010738715A CN111855120A CN 111855120 A CN111855120 A CN 111855120A CN 202010738715 A CN202010738715 A CN 202010738715A CN 111855120 A CN111855120 A CN 111855120A
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- model box
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- coaming
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
Abstract
The suspended type layered shearing model box device comprises a layered shearing box, a suspended supporting device and a pulley device; the layered shearing box comprises a plurality of layers of coamings, and the coamings of each layer are overlapped into a sleeve shape from top to bottom; after the coaming is connected with the pulley device, the coaming can be slidably placed on a groove guide rail of the suspension support device; the suspension supporting device comprises a rigid bottom plate, supporting foot frames and square steel pipes, wherein the four supporting foot frames are welded on the rigid bottom plate; two ends of the square steel pipe are fixed on two adjacent supporting foot frames; the pulley device comprises a T-shaped rod, a pulley block and a spring set, web members of the T-shaped rod are symmetrically welded on two sides of the center height of each layer of coaming, and a guide rod of the T-shaped rod is embedded with a groove on the upper part of the pulley block; the lower parts of the pulley blocks of each layer are arranged on groove guide rails of square steel pipes with corresponding heights; the spring set is arranged in the groove guide rail to connect the pulley and the supporting foot rest. The invention can quickly adjust the frequency of the model box, effectively solve the interference of the model box to the soil under the action of earthquake and greatly weaken the boundary effect of the model.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a suspended laminar shear model box device for a soil body vibration table model test.
Background
With the occurrence of earthquake disasters, the related researches on earthquake resistance of a soil body-upper structure system are widely regarded. The shaking table model test is an important method for performing earthquake-resistant analysis on a soil-superstructure system, and is widely used and accepted. Because the upper structure acts on the foundation soil, the structure and the rock-soil medium generate dynamic interaction under the action of earthquake, and different vibration characteristics are shown. The model soil material and the superstructure scale model are placed in the soil box, so that the interaction of a soil body-superstructure system can be simulated, and the soil box has important significance for researching the earthquake response and earthquake disaster mechanism of the superstructure considering the influence of the soil body, and is a necessary device for researching the dynamic interaction of the soil-superstructure system on the vibrating table test.
In the case of considering the soil-structure dynamic interaction, the foundation soil has no boundary, but when the vibration table model test is carried out, the model soil can be filled in a model box with limited size to simulate an infinite soil domain of a prototype, and the soil-structure system model test is carried out. Due to the heterogeneity of geological conditions and the wave characteristic of seismic wave propagation, wave reflection on the soil and box body interface and the difference of the soil-model box system and the actual soil body vibration form cause certain errors, namely model box effect, to the test result under the action of earthquake. The existing widely-used experimental box body is a rigid model box which has the defects of no deformation capability, obvious model box effect, larger error on the experimental result and incapability of better simulating the influence of a field on an upper structure under the action of an earthquake. In order to eliminate the model box effect, the other widely used experimental box body is a layered shearing model box, and the model box is designed into a unidirectional or bidirectional layered shearing model box, so that the model box can be subjected to layered shearing deformation under the action of an earthquake, and the soil layer-shaped shearing deformation behavior in the model box is ensured. Compared with a rigid model box or a flexible model box, the layered shearing model box has better simulation effect on the semi-limitless property of the foundation soil.
The natural vibration frequency of the existing layered shearing model box is fixed or difficult to adjust. For different underground structure vibration table tests, different prototype strata are usually required to be simulated, and the natural vibration frequency of the corresponding model strata is not fixed. In order to ensure the safety of the shearing model box, the natural vibration frequency of the shearing model box needs to be controlled to be far away from the natural vibration frequency of the model soil. If the natural vibration frequency of the shearing model box is fixed and unchanged, the shearing model box is only suitable for a certain type of stratum, the existing layered shearing box causes the test cost to be increased, the test time to be prolonged, and the test safety to be reduced.
The invention application document of application number 201810786007.9 discloses a shear model box capable of adjusting the natural vibration frequency, in order to prevent model soil from exposing from the layer-to-layer gap of a plane frame in the test of a vibration table, a layer of rubber membrane is arranged on the inner side surface and the inner ground surface of the model soil and a model box body, but in the test process of the vibration table, a through seam is formed between the rubber membrane and the model soil, and the effectiveness of the test result is influenced.
The invention patent of the publication number CN102367674B discloses a suspension type multi-dimensional input horizontal multi-directional shearing model box device, but the displacement controllability between layers of a model box body is poor, a device for movably adjusting the relative displacement between the layers is not arranged in the model box, the simulation effect on the shearing deformation of a soil body is poor, the influence of earthquake excitation on the characteristics of a model box-model soil body system vibrating table and the vertical inertia effect of the model box can not be well eliminated, and the influence on the vibration characteristics of the model soil is great.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects of the existing experimental model box, the invention provides the suspended layered shearing model box device which is used as an effective device for the model test of the rock-soil vibrating table, has the characteristic of quickly and effectively adjusting the frequency of the model box, can effectively solve the interference of the model box on soil under the action of an earthquake and greatly weakens the boundary effect of the model.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the suspension type layered shearing model box device comprises a layered shearing box, a suspension supporting device and a pulley device;
the layered shearing box comprises a plurality of layers of coamings, and each layer of coamings are horizontally placed at equal intervals from bottom to top and are overlapped into a sleeve shape; after being connected with the pulley device, the coaming is placed on a groove guide rail of the suspension support device, and the pulley device horizontally slides on the groove guide rail (the coaming and the pulley device can freely slide along the horizontal direction of the groove guide rail);
the suspension supporting device comprises a rigid bottom plate, a supporting foot frame and a square steel pipe, wherein the rigid bottom plate is fixed on the vibrating table through bolts and vibrates synchronously with the vibrating table; four support foot frames are arranged and are respectively welded and fixed on four corners of the rigid bottom plate; two sides of each layer of coaming are respectively provided with a square steel pipe, each square steel pipe is horizontally provided with a groove guide rail, and two ends of each square steel pipe are fixed on two adjacent supporting foot stands;
the pulley device comprises a T-shaped rod, a pulley block and a spring set, wherein a groove for placing the T-shaped rod is formed in the upper part of the pulley block; the web members of the T-shaped rods are symmetrically welded on two sides of the center height of each layer of coaming, and the guide rods (lower half parts) of the T-shaped rods are embedded with the grooves on the upper parts of the pulley blocks; the lower parts of the pulley blocks of each layer are arranged on groove guide rails of square steel pipes with corresponding heights; the spring group is arranged in the groove guide rails on two sides of the bilateral pulley block on each layer; each group of spring group comprises two springs, and two ends of each spring are respectively connected with the supporting foot stand and the pulley block.
Furthermore, the supporting foot frame is a square steel pipe, and the groove guide rail on the square steel pipe is a U-shaped aluminum alloy frame.
Furthermore, the surrounding plates of the model box body are thin-wall steel plates, the height of each layer of surrounding plate is 10-22 cm, and the thickness of each layer of surrounding plate is 1.8-2.2 mm.
Furthermore, the number of layers of the coaming is 8-12.
Furthermore, the inner side and the outer side of each layer of enclosing plate are provided with double-layer latex films, and the enclosing plates are connected in series and overlapped through the double-layer latex films to connect the upper enclosing plate and the lower enclosing plate in a sleeve manner.
Furthermore, the T-shaped rod of the model box body is formed by welding two plain steel bars.
Furthermore, the groove diameter of the groove at the upper part of the pulley block is slightly larger than the diameter of the guide rod of the T-shaped rod.
Further, according to the experimental requirement, install the spring assembly of the applicable elastic coefficient in each layer of recess guide rail (the spring assembly can be installed and dismantled fast).
Furthermore, cross-shaped supports are additionally arranged on the support foot frames on the two sides without the square steel pipes (so as to increase the rigidity of the model box).
Furthermore, the coaming is circular or square.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the existing earthquake-resistant model test soil box, the suspension type layered shearing model box has the advantages that each layer of coaming can independently slide through the groove guide rail, so that each soil layer can independently move, the inertia effect of the model box body in each direction is greatly eliminated, the influence of the boundary effect of the model box under earthquake excitation on the test result is greatly weakened, and the measured data is more accurate;
2. the device has the function of adjusting the natural vibration frequency, the spring group is arranged in the groove guide rail of the model box, the two ends of the spring are connected with the supporting foot stool and the pulley block, the natural vibration frequency of the model box can be quickly and efficiently changed by replacing springs with different elastic coefficients, the adaptive frequency adjustment can be carried out according to the type of a model soil body, the natural vibration period of the model box is far away from the natural vibration period of a model stratum, and the resonance is avoided; the test method is suitable for the test of the vibration table of different types of model soil, shortens the test time, reduces the test cost, meets the requirements of the test on the shearing model box, and ensures the safe and smooth test;
3. the coaming forming the model box body has a simple structure system and is convenient to install, the number of layers can be freely increased or decreased according to test requirements, the height of the model soil box is adjusted, the applicability of the model box is greatly improved, and the purpose of one box for multiple purposes is achieved.
Drawings
FIG. 1 is a schematic structural view of a suspended laminar shear model box assembly according to the present invention;
FIG. 2 is a schematic structural view of the connection of the circular ring-shaped coaming, the T-shaped rod and the pulley block;
in the figure, 1-a supporting foot frame, 2-a groove guide rail, 3-a circular ring type coaming, 4-T type rods, 5-a pulley block, 6-a rigid bottom plate, 7-a double-layer emulsion film and 8-a spring set.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
As shown in fig. 1 to 2, the suspended laminar shear model box assembly in the embodiment of the present invention includes a laminar shear box, a suspended support assembly, and a pulley assembly. According to the characteristics of the research and design test of the embodiment, the layered shearing box is designed to be of a circular ring type, the layered shearing box is formed by vertically and equidistantly overlapping circular ring type enclosing plates 3, the diameter of each circular ring type enclosing plate 3 is 1.5m, the height of each circular ring type enclosing plate is 20cm, the thickness of each circular ring type enclosing plate is 2mm, the interval of each circular ring type enclosing plate 3 is 1cm, the total number of the circular ring type enclosing plates is ten, the size of a bottom plate 6 is a steel plate with the size of 1.8m multiplied by 0.1m, the total height of a model.
Double-layer latex films 7 are arranged on the inner side and the outer side between the layers of the circular ring-shaped enclosing plates 3, the circular ring-shaped enclosing plates 3 of each layer are overlapped in series through the double-layer latex films 7, the upper circular ring-shaped enclosing plate 3 and the lower circular ring-shaped enclosing plate 3 are connected in a sleeve mode, and model soil is prevented from being exposed from the layer-to-layer gaps of the planar frame in the test of the vibrating table; after the circular ring type coaming 3 is connected with the pulley device, the circular ring type coaming can freely slide in the horizontal direction of the groove guide rail of the suspension supporting device.
The suspension supporting device comprises a rigid bottom plate 6, four supporting foot frames 1 and square steel pipes, wherein the four supporting foot frames 1 are respectively welded and fixed on four corners of the rigid bottom plate 6; two sides of each layer of the circular ring-shaped coaming 3 are respectively provided with a square steel pipe, each square steel pipe is horizontally provided with a groove guide rail, and two ends of each square steel pipe are fixed on two adjacent supporting foot stands 1; on the supporting foot frames 1 on two sides without square steel pipes, cross-shaped supports are added to increase the rigidity of the model box. The distance between the square steel pipe of the first layer of the guide rail 2 with the groove and the rigid bottom plate is 11cm, and the square steel pipe of the guide rail 2 with the groove is welded at intervals of 21cm on the support foot stool 1 at the beginning of the second layer.
The pulley device comprises T-shaped rods 4, a pulley block 5 and a spring group 8, the two T-shaped rods 4 are symmetrically welded at the height center of the circular ring-shaped enclosing plate 3, the T-shaped rods 4 are formed by welding plain circular steel bars with the diameter of 1cm, the length of each web member is 10cm, the end parts of each web member are welded at two sides of the center height of each layer of the circular ring-shaped enclosing plate 3, and the length of each guide rod is 5 cm; a groove with the radius of 1.5cm is formed in the middle of the top of the support piece of the pulley block 5, and a guide rod at the end of the T-shaped rod 4 is placed in the groove in the top of the support piece of the pulley block 5; the pulley device is arranged in the groove guide rail 2 of each layer of square steel pipe of the suspension support device, and two pulley blocks 5 are horizontally arranged in the groove guide rail 2 on each side; the spring group 8 is arranged in the groove guide rails on two sides of the pulley block on two sides of each layer, each spring group comprises two springs, and two ends of each spring are respectively connected with the supporting foot stand 1 and the pulley block 5. According to the test requirements, spring groups with suitable elastic coefficients are installed in the groove guide rails of each layer, the spring groups can be quickly installed and disassembled, and the springs with different elastic coefficients are replaced to adjust the frequency of the model box during use.
When the vibration table test is carried out, the rigid bottom plate 6 is fixed on the vibration table through bolts and vibrates synchronously with the vibration table, and earthquake motion can input any earthquake wave along the horizontal direction of the groove guide rail 2 of the model box.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art can be made without departing from the spirit of the present invention, which is defined by the claims.
Claims (10)
1. Suspension type laminar shear model case device, its characterized in that: the device comprises a layered shearing box, a suspension supporting device and a pulley device;
the layered shearing box comprises a plurality of layers of coamings, and each layer of coamings are horizontally placed at equal intervals from bottom to top and are overlapped into a sleeve shape; after the coaming is connected with the pulley device, the coaming is placed on a groove guide rail of the suspension support device, and the pulley device horizontally slides on the groove guide rail;
the suspension supporting device comprises a rigid bottom plate, a supporting foot frame and a square steel pipe, wherein the rigid bottom plate is fixed on the vibrating table through bolts and vibrates synchronously with the vibrating table; four support foot frames are arranged and are respectively welded and fixed on four corners of the rigid bottom plate; two sides of each layer of coaming are respectively provided with a square steel pipe, each square steel pipe is horizontally provided with a groove guide rail, and two ends of each square steel pipe are fixed on two adjacent supporting foot stands;
the pulley device comprises a T-shaped rod, a pulley block and a spring set, wherein a groove for placing the T-shaped rod is formed in the upper part of the pulley block; the web members of the T-shaped rods are symmetrically welded on two sides of the center height of each layer of coaming, and the guide rods of the T-shaped rods are embedded with the grooves on the upper parts of the pulley blocks; the lower parts of the pulley blocks of each layer are arranged on groove guide rails of square steel pipes with corresponding heights; the spring groups are arranged in the groove guide rails on two sides of each layer of pulley group; each group of spring group comprises two springs, and two ends of each spring are respectively connected with the supporting foot stand and the pulley block.
2. The suspended laminar shear model box assembly of claim 1, wherein: the supporting foot frame is a square steel pipe, and a groove guide rail on the square steel pipe is a U-shaped aluminum alloy frame.
3. The suspended laminar shear model box assembly of claim 1, wherein: the surrounding plates of the model box body are thin-wall steel plates, the height of each layer of surrounding plate is 10-22 cm, and the thickness of each layer of surrounding plate is 1.8-2.2 mm.
4. The suspended laminar shear model box assembly of claim 1, wherein: the number of layers of the coaming is 8-12.
5. The suspended laminar shear model box assembly of claim 1, wherein: the inside and outside of each layer bounding wall sets up double-deck emulsion membrane, establishes ties through double-deck emulsion membrane coincide between each layer bounding wall to the upper and lower bounding wall is connected to the form of "sleeve".
6. The suspended laminar shear model box assembly of claim 1, wherein: the T-shaped rod of the model box body is formed by welding two plain steel bars.
7. The suspended laminar shear model box assembly of claim 1, wherein: the groove diameter of the groove at the upper part of the pulley block is slightly larger than the diameter of the guide rod of the T-shaped rod.
8. The suspended laminar shear model box assembly of claim 1, wherein: according to the test requirements, spring sets with applicable elastic coefficients are installed in the groove guide rails of each layer.
9. The suspended laminar shear model box assembly of claim 1, wherein: the cross-shaped support is additionally arranged on the support foot frames on the two sides without the square steel pipes.
10. The suspended laminar shear model box assembly of claim 1, wherein: the coaming is circular ring type or square.
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| CN202010738715.2A CN111855120A (en) | 2020-07-28 | 2020-07-28 | Suspended layered shearing model box device |
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| CN202010738715.2A CN111855120A (en) | 2020-07-28 | 2020-07-28 | Suspended layered shearing model box device |
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| CN111855120A true CN111855120A (en) | 2020-10-30 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201671117U (en) * | 2010-03-22 | 2010-12-15 | 北京工业大学 | Suspended laminar multi-directional shear model box for test on underground-structure shaking table |
| CN204439317U (en) * | 2015-03-20 | 2015-07-01 | 中国石油大学(北京) | Shaketalle test model casing |
| CN107476359A (en) * | 2017-09-11 | 2017-12-15 | 北京工业大学 | A kind of lamination shear model box for simulating Visco-spring Boundary |
| CN108442307A (en) * | 2017-12-26 | 2018-08-24 | 广西大学 | Soil layer dependent variable measurement method in a kind of laminar shear model clay case and its case |
| CN108489693A (en) * | 2018-02-13 | 2018-09-04 | 建研地基基础工程有限责任公司 | A kind of assembled model clay case of simulation Visco-spring Boundary |
| CN109946175A (en) * | 2019-03-11 | 2019-06-28 | 中国地质大学（武汉） | Full water weak structural face creep properties experimental provision and method after blasting vibration effect |
| CN209878252U (en) * | 2019-06-26 | 2019-12-31 | 中国水利水电科学研究院 | Centrifuge shaking table test model box with adjustable dynamic characteristics |
-
2020
- 2020-07-28 CN CN202010738715.2A patent/CN111855120A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201671117U (en) * | 2010-03-22 | 2010-12-15 | 北京工业大学 | Suspended laminar multi-directional shear model box for test on underground-structure shaking table |
| CN204439317U (en) * | 2015-03-20 | 2015-07-01 | 中国石油大学(北京) | Shaketalle test model casing |
| CN107476359A (en) * | 2017-09-11 | 2017-12-15 | 北京工业大学 | A kind of lamination shear model box for simulating Visco-spring Boundary |
| CN108442307A (en) * | 2017-12-26 | 2018-08-24 | 广西大学 | Soil layer dependent variable measurement method in a kind of laminar shear model clay case and its case |
| CN108489693A (en) * | 2018-02-13 | 2018-09-04 | 建研地基基础工程有限责任公司 | A kind of assembled model clay case of simulation Visco-spring Boundary |
| CN109946175A (en) * | 2019-03-11 | 2019-06-28 | 中国地质大学（武汉） | Full water weak structural face creep properties experimental provision and method after blasting vibration effect |
| CN209878252U (en) * | 2019-06-26 | 2019-12-31 | 中国水利水电科学研究院 | Centrifuge shaking table test model box with adjustable dynamic characteristics |
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