CN103940977A - Adjustable type stratum vibration shearing model box device for shaking table test - Google Patents
Adjustable type stratum vibration shearing model box device for shaking table test Download PDFInfo
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Abstract
The invention provides an adjustable type stratum vibration shearing model box device for a shaking table test and belongs to the technical field of civil engineering. The device is composed of a suspension bracket and a model box, wherein a pre-stress adjusting mechanism driven by a stepping motor is arranged below the box body; a dynamometer is arranged above a rope or a membrane for suspending the box body; an acceleration sensor is arranged in a model soil body of the box body. The dynamometer is connected with a control console composed of a computer; the acceleration sensor is connected with a vibration type tester; the vibration type tester is connected with the control console; the control console is connected with the stepping motor. According to the device, a pre-stress value in the model box body can be adjusted according to the performance of model soil so that the movement forms of the model box and the model soil under the stimulation effect of earthquakes are the same, and furthermore, the influences on power of the model soil by the model box is weakened. Meanwhile, the inner side of the model box body adopts a measure of reducing the friction between the model soil and the model box so as to reduce the influences on vertical deformation on the model soil by the model box; the bottom of the model box adopts a measure of increasing the friction between the model soil and the model box so as to simulate the contact between a prototype soil layer and a base rock.
Description
Technical field
The invention belongs to technical field of civil engineering, relate to a kind of adjustable stratum model of vibration case apparatus for underground structure vibration bench test.
Background technology
In shaking table model, usually simulate the unlimited native territory of prototype with the in-built model clay of model casing of finite size.Like this, because the variation of its borderline wave reflection and system vibration shape will bring certain error to test findings, i.e. so-called " model casing effect ".In order to eliminate model casing effect, design of test box is become to stratiform multi-layer Shear-type, to ensure that model casing inner model soil does stratiform detrusion.Patent of invention " suspended multidimensional-input horizontal-multidirectional-share model box device " (Granted publication number: CN201110350064.0) discloses a kind of Flexible Model about Ecology experimental box of multilayer, though this model casing can not produce resonance with model clay, and model casing moves under the effect of model clay, but in model clay vanning process, because the lateral rigidity of model casing ring and interannular is very little, in model clay vanning process, usually can there is the changing of the relative positions in model casing ring and interannular, the verticality that ensures model casing need to adopt special device, simultaneously in model clay compacting process, often use and vibrate, the measures such as compacting, there will be the situation that soil body local pressure is larger, make certain ring of model casing under native lateral pressure effect and the vertical axis of departing from model casing, simultaneously in shaketalle test process, because the level of model casing is very little to rigidity, though model casing can provide enough lateral rigidities in the altitude range of each ring, and encircling with the level of the connecting portion cable wire encircling to shear stiffness deficiency, in shaketalle test, occur that the horizontal shift of a certain ring is greater than the situation of neighbouring ring suddenly.Utility model patent " a kind of large-scale stratiform shear model box device for underground structure vibration bench test " (Granted publication number: CN201173884Y) discloses a kind of unidirectional shear model box device, this device uses side limit plate for providing horizontal shearing rigidity between the level sealing steel frame that can slide up and down, but the method be not suitable for multi-way shear model box.
Existing stratiform shear model box is to prevent from leaking outside with interlayer from the layer of plane framework at model in shaking table test soil, conventionally at model clay and model box inside, one deck rubber diaphragm is set, but in shaketalle test process, between rubber diaphragm and model clay, form straight joint, especially in the time that model clay is saturated soil, interstitial water gushes from this straight joint, has had a strong impact on the validity of test structure.
The vibration shape of existing model casing is changeless, and for the model soil body, different tests adopts different model clays mostly; Identical model clay, in the time of vanning, because of the difference of operating procedure, the power performance of model clay also can be different; Even with the model clay of once casing, in shaketalle test process, the power performance of model clay self also changes along with the variation of input load, and especially, in the destructive test of underground structure, model dynamic property of foundation will change a lot.For the model clay with different dynamic performance, adopt the constant same model casing of power performance, must cause the vibration shape of model casing and the vibration shape of model ground inconsistent, thereby affect the dynamic response of model in shaking table test ground, will cause some errors to test.
Existing model casing is not all considered the impact of model casing on model clay vertical deformation.Under geological process, any constraint is not received in the free Site Soil vertical direction motion of prototype, if do not eliminate the friction force of model casing inwall to model clay in shaketalle test, must cause near the vertical motion of the model clay of casing can not effectively simulate the vertical motion of prototype soil layer.
Existing model casing is not all considered the contact problems of model box bottom and model clay, desirable model casing should be able to effectively be simulated contacting of prototype Site Soil and bedrock surface, if do not consider this impact, and directly model clay is placed on model casing base plate, in shaketalle test, inevitable at model clay and model casing base plate contact position formation shear zone, and can not effectively simulate prototype Site Soil and bedrock surface contact relation.
Only there is not resonance and ensure that model clay produces the angle design model casing of detrusion in existing model casing from model casing and model clay, all do not consider the impact of model casing on model clay vertical deformation, do not consider how to simulate the contact problems between prototype soil layer and basement rock yet.Do not consider the difference of the vibration shape of model casing and the vibration shape of model clay, more do not consider by the power performance of adjustment model case, the power performance of model casing is changed in shaketalle test, to slacken to greatest extent the impact of model casing on model clay vibratory response with the variation of model clay power performance.
Summary of the invention
The object of the present invention is to provide a kind of by applying prestressed mode, and adjusts prestress value in cable wire and slacken the adjustable multi-way shear model box device that model casing affects model clay dynamic response with model soil capability is different, consider to slacken the problem that model casing contacts with model casing base plate with ESM effective simulation model soil the impact of model clay vertical deformation, to overcome the deficiency of above-mentioned existing experimental box simultaneously.
To achieve these goals, the technical solution used in the present invention is: (with claim 1).This programme is applying before prestress, respectively the interstructural horizontal rigidity of face is very little layer by layer for model casing, and along with applying prestressed increase, the amplitude that the natural frequency of vibration of model casing increases is minimum, and the respectively interstructural shear stiffness increase of face layer by layer of model casing horizontal direction, and the natural frequency of vibration of model casing is very little, can not produce resonance with the model soil body.Calculate the vibration shape of model casing with corresponding software, selecting the vibration shape amplitude of model casing inner model soil middle part measuring point in process of the test is reference mark, according to the relation of the model casing vibration shape and prestress size, adjust the prestressed value of film or rope, make the basic vibration mode of model casing and the basic vibration mode of model clay consistent, draw the prestress value now applying, make comparisons with the actual prestress value that dynamometer is surveyed, the signal of controlled stepper motor.
Described deck structure is aluminum alloy frame or the light-gauge steel section framework of planar structure.Wherein aluminum alloy frame can be Aluminum Hollow alloy closed circle.If this Aluminum Hollow alloy closed circle connects with film, can adopt the form of more than six the PVC film band being evenly arranged along Aluminum Hollow alloy closed circle; If connect with rope, can adopt more than six cable wire being evenly arranged along Aluminum Hollow alloy closed circle.
In order to reduce the impact of model casing on model clay vertical deformation and the contact problems of solution model clay and model casing base plate, take following measure:
Between described model casing medial surface and the soil body, be provided with the aspect that reduces friction; Paste rubble, cobble or grogs at model box bottom.
The described aspect that reduces friction, at described deck structure inner side spraying Teflon coating, forms Teflon coating; Or at described deck structure inner side spraying lubricating oil
In order to prevent forming straight joint between rubber diaphragm and model clay, take following measure:
In described model casing, rubber diaphragm is set, and model grogs is bonded on the face that rubber diaphragm contacts with model clay with rubber asphalt bonding agent or other bonding agent.
The present invention has following beneficial effect and advantage: with existing aseismic model experimental box ratio, in the present invention, by rope (film), each deck structure is connected, and be fixed between suspension holdfast and stiff baseplate, and by adjusting the prestressed size in rope (film), change the horizontal rigidity of model casing, so make the vibration shape of model casing and the vibration shape of model clay consistent.Not only ensure the horizontal direction generation detrusion of the model soil body, and made model casing consistent with the motion morphology of model clay under the effect of shaking table input seismic stimulation, weakened to the utmost the impact of model casing on model clay dynamic response.Simultaneously, in shaketalle test process, by changing the prestress value in model casing cable wire, make the vibration shape of model casing and the vibration shape of model clay consistent, even in the destructive test of underground structure, can ensure the consistance of the vibration shape of model casing and the vibration shape of model clay, the model soil body, in the time of different physical state, all can make model casing minimum on its dynamic response impact.The coating or the coating lubricating oil that reduce friction in the inside surface spraying of aluminum alloy frame, reduce the impact of model casing on the vertical displacement of the model soil body.Consolidating material bonding cobble or rubble for model casing base plate, effectively simulate the surface of contact between prototype ground and structure.One deck rubber diaphragm is set to prevent the external leakage of model clay at described model casing inwall, with bonding agent, model grogs is bonded on the face that rubber diaphragm contacts with model clay simultaneously, rubber diaphragm is contacted with model clay well, to prevent forming straight joint between rubber diaphragm and the model soil body, avoid water in model clay along gushing on the straight joint forming.
Brief description of the drawings
Fig. 1 is the front view of shaketalle test of the present invention with an embodiment of adjustable stratum oscillatory shear model casing device;
Fig. 2 is vertical view embodiment illustrated in fig. 1;
Fig. 3 is that 1-1 embodiment illustrated in fig. 1 is to sectional view;
Fig. 4 is the cating nipple structural representation in device embodiment illustrated in fig. 1;
Fig. 5 is the screw mandrel telescoping mechanism structural representation in device embodiment illustrated in fig. 1.
In figure, 1, roof beam structure, 2, universal caster wheel or universal joint, 3, vertical vibration isolation bearing, 4, Height Adjustable bolt, 5 rigidity enclosure walls, 6, Aluminum Hollow alloy closed circle, 7, base plate, 8, film band or rope, 9, billet, 10, steel channel beam, 11, dynamometer, 12, screw mandrel telescoping mechanism, 13, screw mandrel, 14, nut, 15, sleeve, 16, rubber diaphragm, 17, rubble.
Embodiment
Further illustrate the present invention below by an embodiment.
Model casing in the present embodiment is made up of the roof beam structure (as girder steel) of 18 deck structure and rigidity and the base plate of rigidity (as steel plate and reinforced concrete combination base plate), deck structure wherein adopts circular Aluminum Hollow alloy closed circle 7, each deck structure is vertically equidistantly arranged in parallel, be connected in series by six film bands that are evenly arranged or rope 8, film band or rope 8 hang on roof beam structure 1.Described roof beam structure 1 is by six groups of cating nipple framves being evenly arranged on suspension holdfast, and described suspension holdfast is rigidity enclosure wall 5, is trapped among the deck structure surrounding of model casing, and is fixed on the base plate 7 of model casing.The bottom of described film band or rope 8 is connected with the steel channel beam 10 that is fixed on model casing base plate by screw mandrel telescoping mechanism 12; The top of film band or rope 8 is connected with the roof beam structure 1 of model casing by dynamometer 11.In shaketalle test process, in the model clay at model casing middle part, be evenly arranged four acceleration transducers along soil body height.
In cating nipple wherein, be provided with height adjustment mechanism, as Fig. 4, universal caster wheel or universal joint 2 are arranged on vertical vibration isolation bearing 3, and vertical vibration isolation bearing 3 arranges Height Adjustable bolt 4 below; Height Adjustable bolt 4 is arranged on billet 9.
Screw mandrel telescoping mechanism 12 wherein as shown in Figure 5, U-steel frame 10 welds together with the base plate of model casing, the side welded sleeve 15 of U-steel frame 10, screw mandrel 13 is through sleeve 15, the upper end of screw mandrel 13 is connected with film band or rope 8, the bottom cover of screw mandrel 13 has the setting nut 14 coordinating with wire rod thread, and setting nut 14 is by stepper motor driven rotary.
Described dynamometer 11 is received the control desk being made up of computing machine; Described acceleration transducer is received vibrating tester, and control desk is received in the output of vibrating tester; Control desk outputs a control signal to described stepper motor.
At described model casing inwall, one deck rubber diaphragm 16 is set, with rubber asphalt bonding agent, model grogs is bonded on the face that rubber diaphragm 16 contacts with model clay simultaneously.At the inside surface spraying Teflon coating of Aluminum Hollow alloy closed circle 6, form Teflon coating.On model casing base plate 7 with grout bonding rubble 17.
More than form adjustable stratum oscillatory shear model casing device for shaketalle test of the present invention.
Utilize this device and coordinate corresponding program, can apply prestress to the cable wire of suspended model casing (film), for model casing provides shear stiffness between layers, and by adjusting the mode of the prestress size that applies, change the vibration shape of model casing, so that model casing has enough horizontal rigidities in horizontal all directions, also can ensure that detrusion occurs model clay in shaketalle test, and can be according to the kinematic behavior of model clay, the vibration shape of adjustment model case, make the basic vibration mode of model casing consistent with the basic vibration mode of the model soil body, utilize the natural frequency of vibration of model casing to be far smaller than the natural frequency of vibration of model clay simultaneously, slacken the impact of model casing on model clay dynamic response.The present invention is according to the power performance of the power performance adjustment model case of model clay, the vibration shape of having realized model casing approaches model soil body vibration shape, and in process of the test, make the vibration shape of model casing change with the change of model clay vibration shape, further slacken model casing effect., model grogs is bonded on the face that rubber diaphragm contacts with model clay with rubber asphalt bonding agent meanwhile, rubber diaphragm is contacted with model clay well, to prevent forming straight joint between rubber diaphragm and the model soil body, avoid the water in model clay to overflow along the straight joint forming.The coating or the coating lubricating oil that reduce friction in the inside surface spraying of Aluminum Hollow alloy closed circle, reduce the impact of model casing on the vertical displacement of the model soil body, effectively to simulate the vertical deformation of the soil body.Binder Materials bonding rubble or cobble for model casing base plate, effectively to simulate the surface of contact between prototype ground and structure.Above measure makes the seismic response of the more effective simulation prototype of the model system soil layer of model casing and model clay composition.
Claims (9)
1. adjustable stratum oscillatory shear model casing device for shaketalle test, is installed on by enclosure wall shape suspension holdfast and bottom the model casing that shaking table, top hang in suspension holdfast and forms; Described model casing is made up of 10 layers of above deck structure and the roof beam structure of rigidity and the base plate of rigidity, described deck structure is rigidity and lightweight, its flat shape is any and identical, each deck structure is vertically equidistantly arranged in parallel, be connected in series by six above film band or ropes of being evenly arranged, film band or rope top are fixed on described roof beam structure, and bottom is fixed on described base plate by screw mandrel telescoping mechanism; Described roof beam structure on described suspension holdfast, is provided with height adjustment mechanism in this cating nipple by the more than three groups cating nipple frame that is evenly arranged; Described suspension holdfast is rigidity enclosure wall, is arranged on described base plate; Described base plate and vibration table are fixed together; It is characterized in that: between each described film band or rope and described base plate, be connected by screw mandrel telescoping mechanism, this screw mandrel telescoping mechanism drives operation by stepper motor; Be provided with dynamometer at each described film band or rope with described roof beam structure junction; The center of the soil body in model casing, along short transverse from the soil body, bottom is evenly arranged at least four acceleration transducers to soil body top, the output access vibrating tester of this acceleration transducer; The control desk that computing machine forms is received in the output of described dynamometer and the output of described vibrating tester, and described stepper motor is received in the output of this control desk.
2. adjustable stratum oscillatory shear model casing device for shaketalle test as claimed in claim 1, is characterized in that: the aluminum alloy frame that described deck structure is planar structure or light-gauge steel section framework.
3. adjustable stratum oscillatory shear model casing device for shaketalle test as claimed in claim 2, is characterized in that: described aluminum alloy frame is Aluminum Hollow alloy closed circle.
4. adjustable stratum oscillatory shear model casing device for shaketalle test as claimed in claim 3, is characterized in that: described film is more than six the PVC film band being evenly arranged along Aluminum Hollow alloy closed circle.
5. adjustable stratum oscillatory shear model casing device for shaketalle test as claimed in claim 3, is characterized in that: described rope is more than six cable wire being evenly arranged along Aluminum Hollow alloy closed circle.
6. adjustable stratum oscillatory shear model casing device for the shaketalle test as described in any one in claim 1-5, is characterized in that: between described model casing body side surface and the soil body, be provided with the aspect that reduces friction; Paste rubble, cobble or grogs at model box bottom.
7. shaketalle test as claimed in claim 6 is characterized in that with adjustable stratum oscillatory shear model casing device: described in reduce friction aspect at described deck structure inner side spraying Teflon coating, form Teflon coating.
8. shaketalle test as claimed in claim 6 is characterized in that with adjustable stratum oscillatory shear model casing device: described in reduce friction aspect at described deck structure inner side spraying lubricating oil.
9. shaketalle test is characterized in that with adjustable stratum oscillatory shear model casing device as claimed in claim 7 or 8: between described model casing body side surface and the soil body, be provided with rubber diaphragm, and model grogs be bonded on the face that rubber diaphragm contacts with model clay with grout or other bonding agent.
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Cited By (9)
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| CN104406755A (en) * | 2014-12-11 | 2015-03-11 | 河南工业大学 | Laminar vibrating shear soil box testing apparatus |
| CN104609052A (en) * | 2015-01-28 | 2015-05-13 | 同济大学 | Flexible container for soil and structure interaction shaking table test |
| CN104634946A (en) * | 2015-02-05 | 2015-05-20 | 中国矿业大学(北京) | Slope model loading testing device |
| CN106680102A (en) * | 2017-01-13 | 2017-05-17 | 同济大学 | Servo pressure control high-pressure underground project test box system |
| CN106813887A (en) * | 2015-12-02 | 2017-06-09 | 中国石油大学(北京) | One kind layering brace type detrusion experimental provision |
| CN106940235A (en) * | 2017-03-07 | 2017-07-11 | 北京工业大学 | The shake table model clay case experimental rig of fast changeable model casing |
| CN108318206A (en) * | 2018-04-13 | 2018-07-24 | 广州建设工程质量安全检测中心有限公司 | The fundamental frequency regulatable vibration platform model test of multidirectional load shears case in a kind of face |
| CN109632228A (en) * | 2019-01-12 | 2019-04-16 | 天津大学 | A kind of equivalent shear beam model casing system of controllable wall stiffness |
| CN112781977A (en) * | 2021-01-27 | 2021-05-11 | 武汉理工大学 | Counter force type laminated shearing model box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104406755A (en) * | 2014-12-11 | 2015-03-11 | 河南工业大学 | Laminar vibrating shear soil box testing apparatus |
| CN104609052A (en) * | 2015-01-28 | 2015-05-13 | 同济大学 | Flexible container for soil and structure interaction shaking table test |
| CN104634946A (en) * | 2015-02-05 | 2015-05-20 | 中国矿业大学(北京) | Slope model loading testing device |
| CN106813887A (en) * | 2015-12-02 | 2017-06-09 | 中国石油大学(北京) | One kind layering brace type detrusion experimental provision |
| CN106680102A (en) * | 2017-01-13 | 2017-05-17 | 同济大学 | Servo pressure control high-pressure underground project test box system |
| CN106940235A (en) * | 2017-03-07 | 2017-07-11 | 北京工业大学 | The shake table model clay case experimental rig of fast changeable model casing |
| CN108318206A (en) * | 2018-04-13 | 2018-07-24 | 广州建设工程质量安全检测中心有限公司 | The fundamental frequency regulatable vibration platform model test of multidirectional load shears case in a kind of face |
| CN108318206B (en) * | 2018-04-13 | 2024-02-27 | 广州建设工程质量安全检测中心有限公司 | Base frequency adjustable vibrating table model test shear box with in-plane multidirectional loading |
| CN109632228A (en) * | 2019-01-12 | 2019-04-16 | 天津大学 | A kind of equivalent shear beam model casing system of controllable wall stiffness |
| CN112781977A (en) * | 2021-01-27 | 2021-05-11 | 武汉理工大学 | Counter force type laminated shearing model box |
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