CN111999025A - Spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction - Google Patents
Spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction Download PDFInfo
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- CN111999025A CN111999025A CN202010741571.6A CN202010741571A CN111999025A CN 111999025 A CN111999025 A CN 111999025A CN 202010741571 A CN202010741571 A CN 202010741571A CN 111999025 A CN111999025 A CN 111999025A
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- 230000003993 interaction Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000013401 experimental design Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 12
- 230000005484 gravity Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
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- 230000007547 defect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 239000011150 reinforced concrete Substances 0.000 description 1
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- 238000010008 shearing Methods 0.000 description 1
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- 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
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Abstract
The invention discloses a quasi-static push-cover test device and method for an underground structure. Horizontal loading system is all carried the girder steel by counter-force wall, horizontal actuator and level and is constituteed, and vertical loading system is all carried the girder steel by top counter-force girder steel, vertical actuator and vertical and is constituteed, and interactive system comprises end reaction plate, spring and counter-force steelframe. The method comprises the following steps of arranging a model structure on a bottom reaction plate, arranging springs between the model structure and the bottom reaction plate and between the model structure and a counter-force steel frame, applying vertical force on the top of the model structure through a vertical actuator and an equal-load steel beam, and applying monotone increasing forced horizontal displacement of certain distribution to the structure along the height through a horizontal loading system until the underground structure is damaged. The invention can simulate the soil-structure interaction in the underground structure pseudo-static test through the spring, and has the advantages of good economy, large scale ratio, convenience for observing test phenomena and the like.
Description
Technical Field
The invention relates to the technical field of underground structure tests, in particular to a spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction.
Background
The recording of earthquake damage of the underground structure in the past earthquake shows that the underground structure can be seriously damaged under the action of strong earthquake, so that the reasonable earthquake-proof design of the underground structure is very necessary. The earthquake-resistant design based on the performance is a stage with milestone significance in the earthquake-resistant design concept of the underground structure, so that the method for researching the earthquake-resistant performance of the underground structure is perfected, the limit value of the displacement angle between the layers of the underground structure is quantized, and the method has important scientific significance.
Therefore, the research on the earthquake-resistant performance of the underground structure by means of a model test is also the development direction of the field at present. Common test methods in the underground structure earthquake-proof research include a common vibration table test, a centrifuge vibration table test and a pseudo-static test. The common vibration table test is carried out in a 1g gravity environment, the gravity distortion effect exists due to the adoption of a reduced scale model, and the axial pressure ratio of the underground structure is an important factor influencing the anti-seismic performance index of the underground structure, so that the common vibration table test has limitation on the research on the anti-seismic performance of the underground structure. The centrifuge shaking table test can better simulate the gravity environment close to the prototype gravity field, is widely applied to the underground structure anti-seismic model test at present, obtains good test effect, but is limited by the bearing capacity of the centrifuge, and has small test model size and difficult data test, so the study on the underground structure anti-seismic performance by the centrifuge shaking table test has obvious defects. The geometric scale ratio of the structure in the pseudo-static test is usually larger, and the axial pressure ratio and the soil stress level of the structure can be adjusted by applying overlying load, so that the seismic performance of the underground structure is reasonably researched by adopting the pseudo-static test. However, the following problems still exist in the pseudo-static test: the geometric scaling ratio of the pseudo-static test of the soil-structure system is smaller than that of the test of a single structure body, the test step sequence is relatively complex, and the economy is poor; the problem of soil-structure interaction cannot be reflected by a single structure body pseudo-static test; the single component pseudo-static test cannot reflect the structural weak link and can not reflect the soil-structure interaction.
In order to overcome the problems of the test methods for researching the earthquake resistance of the underground structure, the pseudo-static test device and the method for the underground structure, which have the advantages of strong economy, simple step sequence and consideration of soil-structure interaction, are urgently needed to be solved. Because the traditional soil body material is a loose medium, the shear modulus of the traditional soil body material is a function of confining pressure, a better result can be obtained only by simulating the stress state of real soil when the soil-structure interaction is considered, and the spring is adopted to replace the soil body to consider the soil-structure interaction, the rigidity of the spring can be adjusted by adjusting the size of a component, a large amount of soil body around the structure is not needed, and the soil body material has the advantages of good economy and large scale reduction ratio. One side of the spring is fixed on the bottom reaction plate and the reaction steel frame, and the other end of the spring is in close contact with the structure, so that the mechanical characteristics that the soil body can only be compressed but can not be pulled and the constraint effect of the surrounding soil body on the underground structure can be well simulated.
Disclosure of Invention
The invention discloses a spring-underground structure system pseudo-static force push-cover test device and method considering soil-structure interaction aiming at the defects of the existing underground structure anti-seismic test technology in the research of the anti-seismic performance of an underground structure.
The invention adopts the following specific technical scheme: the utility model provides a spring-underground structure system of considering soil-structure interaction plans static and pushes away and covers test device, includes bottom plate, horizontal loading system, vertical loading system, interaction system and underground structure model, its characterized in that:
the bottom plate (1), the bottom reaction plate (2) and the reaction wall (3) are made of reinforced concrete materials, and the bottom reaction plate (2) and the reaction wall (7) are anchored on the bottom plate (1).
Horizontal loading system carries girder steel (5) by counterforce wall (3), horizontal actuator (4) and level and constitutes, horizontal actuator (4) are arranged according to actual conditions along vertical, should arrange as close as possible, and horizontal actuator (4) all carry girder steel (5) with the level and articulate.
The interaction system consists of the spring (9), a counterforce bolt (12) and a spring guide steel groove (13). The elastic modulus of the spring can be adjusted by adjusting the material parameters, the size and the like of the spring; applying a vertical load through a vertical loading system to generate an interaction force between the bottom spring and the underground structure model so as to simulate the interaction between the bottom of the structure and the bottom soil body; the lateral springs are closely contacted with the underground structure model through measures of fixing a horizontal loading system, tightening a counter-force bolt and the like, and a horizontal interaction force is generated so as to simulate the interaction between the side surface of the structure and the side soil body. The elastic modulus of the bottommost spring in the lateral springs of the structure can be increased to consider the tangential force action of the underground structure bottom plate and the bottom soil body, so that the structure is prevented from being subjected to overlarge horizontal translational deformation.
The working principle of the invention is as follows: the dimensions of an underground structure model, a bottom reaction plate, a steel spring and a counterforce steel frame are determined according to model test requirements, test sites, test equipment and other overall conditions, a vertical loading system is used for applying vertical load to the underground structure model to simulate the axial pressure of the structure in a real state, the springs, the bottom reaction plate, the counterforce bolts, the spring guide steel grooves and the counterforce steel frames are arranged to simulate soil-structure interaction, the horizontal actuators and the horizontal load-sharing steel beams are used for applying forced horizontal displacement of certain distribution to the underground structure model at different height positions to simulate the horizontal earthquake action suffered by the structure, and the structure is subjected to monotonously increasing unidirectional thrust until the underground structure model is damaged. Measures such as pasting strain gauges on the structure, arranging cameras and the like can analyze the earthquake resistance and earthquake damage modes of the underground structure.
The invention has the advantages that: the geometric similarity of the tests is large; soil-structure interactions may be considered; by adjusting the spring parameters, the size, the spring prestress value, the displacement input of the horizontal actuator and the vertical load, the earthquake resistance of the underground structure under different surrounding rock conditions and different burial depths can be simulated; the test has simple step sequence and good economical efficiency, and can accurately obtain the earthquake resistance and the failure mode of the underground structure.
Drawings
FIG. 1 is an overall side view of the test apparatus.
Fig. 2 is a plan view of the bottom reaction plate.
FIG. 3 is an elevation view of a side edge interaction system.
FIG. 4 is a side view of a side interaction system.
FIG. 5 is an overall three-dimensional side view of the test apparatus.
Fig. 6 is a three-dimensional side view of a spring guide slot.
Fig. 7 is a three-dimensional side view of a spring.
In the figure: 1. the bottom plate, 2, end reaction plate, 3, counterforce wall, 4, horizontal actuator, 5, the level all carries the girder steel, 6, top counterforce girder steel, 7, vertical actuator, 8, the vertical girder steel that all carries, 9, spring, 10, counterforce steelframe, 11, underground structure model, 12, counterforce bolt, 13, spring direction steel bay.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1 to 7, a spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction are characterized in that: the steel beam counter-force device comprises a bottom plate (1), a bottom counter-force plate (2), a counter-force wall (3), a horizontal actuator (4), a horizontal uniform load steel beam (5), a top counter-force steel beam (6), a vertical actuator (7), a vertical uniform load steel beam (8), a spring (9), a counter-force steel frame (10), an underground structure model (11), a counter-force bolt (12) and a spring guide steel groove (13).
The bottom reaction plate (2) is fixed on the bottom plate (1) through bolts, the spring guide steel groove (13) is arranged in a reserved groove in the bottom reaction plate (2), and then the spring (9) is installed in the spring guide steel groove (13). And arranging the underground structure model (11) on a spring on a bottom reaction plate, installing a vertical loading system consisting of the top reaction steel beam (6), the vertical actuator (7) and the vertical uniform load steel beam (8), and starting the vertical loading system to apply a designed vertical load on the underground structure model (11). And a horizontal loading system consisting of a horizontal actuator (4) and horizontal uniform-load steel beams (5) is arranged between the underground structure model (11) and the reaction wall (3). And installing the reaction steel frame (10), arranging the spring guide steel groove (13) and the spring (9) between the reaction steel frame (10) and the underground structure model (11), and arranging a reaction bolt (12) at the position corresponding to the spring (9) on the other side of the reaction steel frame. Tightening the reaction bolt (12) to a certain position applies a certain initial prestress to the structure, and when the bolt is kept tightened, the horizontal actuator is kept from displacing. After the test device is assembled, horizontal displacement in a certain distribution form is applied to the layered shearing boxes with different heights by adopting the horizontal actuator (4), and the horizontal displacement is gradually increased until the structure is damaged, so that the seismic performance of the underground structure is inspected.
In the present example, the size parameters of the springs (9) at the bottom and the side can be adjusted to take account of the seismic response of the underground structure under different surrounding rock conditions.
In the example, the earthquake-resistant performance of underground structures with different axial pressures can be examined by adjusting the force applied by the vertical actuator (7) to apply different axial pressures to the structures.
Claims (8)
1. A spring-underground structure system pseudo-static force push test device considering soil-structure interaction is characterized in that: the pseudo-static test device is composed of a bottom plate (1), a bottom reaction plate (2), a reaction wall (3), a horizontal actuator (4), a horizontal load-sharing steel beam (5), a top reaction steel beam (6), a vertical actuator (7), a vertical load-sharing steel beam (8), a spring (9), a reaction steel frame (10), an underground structure model (11), a reaction bolt (12) and a spring guide steel groove (13); the horizontal loading system consists of the counterforce wall (3), the horizontal actuator (4) and the horizontal load-bearing steel beam (5); the vertical loading system consists of the top reaction steel beam (6), the vertical actuator (7) and the vertical uniform loading steel beam (8); the interaction system consists of a bottom reaction plate (2), a spring (9) and a reaction steel frame (10); a spring guide groove is formed in the bottom reaction plate (2), the spring (9) is arranged in the spring guide groove in the bottom reaction plate (2), the underground structure model (11) is arranged on the spring (9), the reaction steel frame (10) is fixed at the corresponding position of the bottom plate (1), the spring (9) is arranged in the spring guide groove (13) at the corresponding position of the reaction steel frame (10), and the spring (9) is positioned between the reaction steel frame (10) and the underground structure model (11); and starting a vertical loading system to apply a designed vertical load to the underground structure model (11), adjusting the lateral spring pre-stressing force on the counterforce steel frame (10) by screwing the counterforce bolt (12) after the vertical load is stable, and keeping the displacement of the horizontal actuator unchanged when the spring pre-stressing force is applied so as to balance the side spring pre-stressing force.
2. The spring-underground structure system pseudo-static push test device considering soil-structure interaction of claim 1, wherein: the bottom reaction plate (2) is anchored on the bottom plate (1), and a spring guide groove is arranged at the corresponding position of the bottom reaction plate (2).
3. The spring-underground structure system pseudo-static push test device considering soil-structure interaction of claim 1, wherein: the nut part of the counterforce bolt (12) is connected with the counterforce steel frame (10) in a welding mode, and the spring (9) generates controllable deformation by rotating the screw rod part.
4. The spring-underground structure system pseudo-static push test device considering soil-structure interaction of claim 1, wherein: the horizontal actuator (4) is hinged with the horizontal load-bearing steel beam (5).
5. The spring-underground structure system pseudo-static push test device considering soil-structure interaction of claim 1, wherein: the spring (9) needs to be manufactured by selecting corresponding material sizes according to the spring stiffness value of the experimental design, so that the interaction between the spring and the structure reflects the actual soil-structure interaction as much as possible.
6. The spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction according to claim 1, wherein: the vertical actuator (7) applies constant vertical load, and the axial pressure ratio of each vertical component of the underground structure model (11) is improved to reach and stabilize at a test design value.
7. The spring-underground structure system pseudo-static force push test device and method considering soil-structure interaction according to claim 1, wherein: vertical actuator (7) with vertical all carry the girder steel (8) and take place between along pushing away the free slip that covers the direction.
8. A spring-underground structure system quasi-static push test method considering soil-structure interaction by using the device of claim 1, which is characterized in that the test method specifically comprises the following steps:
the method comprises the following steps: placing and fixing the bottom reaction plate (2) at a corresponding position of the bottom plate (1), placing the spring (9) in a spring guide groove on the bottom reaction plate (2), and placing the underground structure model (11) on the spring (9);
step two: installing a horizontal loading system, starting the horizontal loading system to enable the horizontal loading steel beam (5) to be closely attached to the underground structural model (11), then fixing the counterforce steel frame (10) at a corresponding position of the bottom plate (1), and placing the spring (9) in the spring guide groove (13) at the corresponding position on the counterforce steel frame (10) to enable the spring (9) to be located between the counterforce steel frame (10) and the underground structural model (11);
step three: installing a vertical loading system, and starting the vertical loading system to apply designed vertical load to the underground structure model (11);
step four: after the vertical load is stable, the horizontal displacement of the horizontal load-bearing steel beam (5) is kept, and the lateral spring prestress on the counterforce steel frame (10) is adjusted by screwing the counterforce bolt (12);
step five: and starting a horizontal loading system to apply certain distribution of forced horizontal displacement to the underground structure model (11) until the structure is damaged so as to obtain the structure anti-seismic performance and the damage mode considering the soil-structure interaction.
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Citations (6)
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|---|---|---|---|---|
| ES2308891A1 (en) * | 2006-06-01 | 2008-12-01 | Universitat Politecnica De Catalunya | Plant for the axial and transversal dynamic characterization of springs and vibration insulators. (Machine-translation by Google Translate, not legally binding) |
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| CN108267284A (en) * | 2018-03-08 | 2018-07-10 | 大连理工大学 | A kind of dam structure library water pressure simulation system |
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-
2020
- 2020-07-29 CN CN202010741571.6A patent/CN111999025A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2308891A1 (en) * | 2006-06-01 | 2008-12-01 | Universitat Politecnica De Catalunya | Plant for the axial and transversal dynamic characterization of springs and vibration insulators. (Machine-translation by Google Translate, not legally binding) |
| CN106500941A (en) * | 2016-11-02 | 2017-03-15 | 同济大学 | Small two-dimension vibration test platform |
| CN107132034A (en) * | 2017-05-09 | 2017-09-05 | 昆明理工大学 | A kind of underground structure pseudo static testing device and method |
| CN107228803A (en) * | 2017-05-09 | 2017-10-03 | 昆明理工大学 | A kind of composite structure pseudo static testing device and method |
| CN108267284A (en) * | 2018-03-08 | 2018-07-10 | 大连理工大学 | A kind of dam structure library water pressure simulation system |
| CN111141607A (en) * | 2020-01-13 | 2020-05-12 | 北京工业大学 | Self-balancing multi-loading-path unidirectional shearing box for pile-soil test |
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Application publication date: 20201127 |