CN210571263U

CN210571263U - Dam body anti-seismic test simulation device with controllable vibration frequency partitions

Info

Publication number: CN210571263U
Application number: CN201921245314.2U
Authority: CN
Inventors: 钟登华; 练继建; 燕翔; 王孝群; 刘铭劼
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-05-19
Anticipated expiration: 2029-08-02

Abstract

The utility model belongs to the technical field of seismic engineering simulation research, and discloses a dam body anti-seismic test simulation device with controllable vibration frequency partitions, which mainly comprises a data acquisition system, a vibration table module, a foundation box, a foundation and a dam body; the vibration table module comprises a high-frequency vibration table and a low-frequency vibration table; the dam body receives the vibration synthesized by the low frequency and the high frequency from conduction; the low-frequency vibration table is also fixedly provided with a water tank which is flexibly and hermetically communicated with the foundation box, the dam body divides the communicated area into an upstream water body area and a downstream water body area, one side of the water tank is an upstream water body area, and upstream water in the upstream water body area receives low-frequency vibration and acts on the dam body; a damping boundary body is arranged between the foundation box and the foundation. The utility model discloses the device makes the dam body shock resistance test simulation accord with the actual use condition of big scale high dam more through high low frequency vibration subregion simulation, and the experimental data that obtains tend to rationally, accurate, has reduced the testing cost simultaneously.

Description

Dam body anti-seismic test simulation device with controllable vibration frequency partitions

Technical Field

The utility model belongs to the technical field of seismic engineering simulation research, a dam body anti-seismic test analogue means that vibration frequency subregion is controllable is related to.

Background

In recent years, in order to adapt to the rapid development of the hydropower industry in China, a large number of high dam water body areas have been built or started to be built successively. At present, 20 dams in the first 100 dams with high dam height in the world occupy 20 in China, wherein 14 dams are available in the dam height of more than 200m, and the water conservancy dams with the dam height of more than 300m are not uncommon in China. As a plurality of earthquake zones run through the geographic structure of China, the earthquake resistance of the dam is a very important assessment index in design and project construction, and the earthquake resistance is related to the safety of the dam and the life and property safety of downstream cities and population, particularly high dam projects. Therefore, the research on the earthquake dynamic response of the dam body and the foundation of the high dam has important significance on the engineering safety of the high dam.

The earthquake-resistant test simulation device is the most effective facility for earthquake engineering simulation research, and generally comprises: pseudo-static force, pseudo-dynamic force, earthquake simulation vibration table, in-situ test and the like. The design of the dam body of the high dam especially needs a seismic test simulation device. The high dam body is placed on a vibration table to carry out a dynamic response simulation test, the anti-seismic performance of the dam can be verified and checked through comparison of collected test data and theoretical data, and favorable guarantee is provided for high dam engineering design and operation safety.

At present, the following significant problems exist when the earthquake-resistant test simulation device is applied to a high dam simulation test:

1. the simulation of the hydrodynamic pressure is crucial to the test of the high dam shaking table, and the influence degree can reach more than 10%. In actual earthquake, the water body in the water body area is influenced by earthquake vibration, and the phenomenon of dynamic water pressure change in the earthquake process cannot be completely reflected by a simple still water environment; however, if the water body area is reduced, a reduced scale model is established and is established on the vibration table, the vibration table needs to be larger in size, higher in load carrying capacity and wider in vibration frequency range, and the reduced scale proportion of the simulation test is restricted;

2. for a high dam, the loading frequency is in great contradiction with the geometric dimension and the load. The earthquake motion may affect the tenth-order self-vibration frequency of the dam, if a large-scale vibration table is adopted for simulation, the size can be enlarged, the simulation precision is improved, but the high frequency cannot be loaded; if a small vibration table is adopted for simulation, high-frequency loading can be carried out, but the geometric dimension is small, and the simulation precision is limited;

3. the frequency of the water body in the water body area is generally 1-2 Hz, and in the dam body earthquake resistance test simulation device, the high-frequency loading which is the same as that of the dam body is adopted in the water body area, so that the simulation cost is undoubtedly greatly increased, and the simulation effect is not greatly improved.

In order to reasonably, efficiently and economically carry out seismic test simulation on dam body design under a large-scale condition, a seismic test simulation device which can load high frequency on the dam body and load low frequency on a water body area to simulate actual use conditions as accurately as possible needs to be developed, so that the technical bottleneck existing in seismic test simulation tests of large-scale high dam test models is solved.

Disclosure of Invention

In order to solve the problem, the utility model provides a controllable dam body anti-seismic test analogue means of vibration frequency subregion. The aim is to realize the vibration frequency zone controllable simulation of the large-scale high-dam anti-seismic simulation test, and improve the simulation accuracy, the reasonability and the economy of the anti-seismic test.

The utility model adopts the technical scheme as follows:

a dam body anti-seismic test simulation device with controllable vibration frequency partition comprises a data acquisition system, a vibration table module, a foundation box fixedly arranged on the vibration table module, a foundation fixedly arranged in the foundation box and a dam body fixedly arranged on the foundation; the vibration table module comprises a low-frequency vibration table and a high-frequency vibration table which is rigidly arranged on the low-frequency vibration table; the foundation box is fixedly arranged on the high-frequency vibration table, the dam body extends to the opposite side wall of the foundation in the foundation box, and the space in the foundation is divided into an upstream water body area and a downstream water body area; the low-frequency vibration table is also fixedly provided with a water tank, the water tank and the foundation box are arranged at intervals and in parallel, the adjacent side surfaces of the water tank and the foundation box are respectively corresponding to a groove opening, the water tank and the foundation box are connected at the groove openings through a sealing connection device, and an upstream water body area of the foundation box and the water tank are communicated into a whole; the upstream water area is filled with upstream water.

And a damping boundary body is fixedly arranged between the foundation box and the foundation and is used for simulating the radiation damping effect of the foundation.

The sealing connecting device is a flexible sealing connecting device.

The downstream water area is filled with downstream water with a lower water level relative to the upstream water.

The notch is consistent with the shape of the foundation, and the upper end face of the notch is not lower than the surface of the foundation.

The data acquisition system comprises a sensor and a data acquisition instrument, and the data transmission of the sensor and the data acquisition instrument is cable transmission and/or wireless transmission.

The sensors are one or more of a pore water pressure gauge and/or a soil pressure gauge distributed at the local part of the foundation, and an acceleration sensor, a speed sensor, a displacement sensor and a stress-strain sensor distributed at the local part of the dam body. .

Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:

(1) the utility model discloses in the low frequency shaking table on set firmly the scheme that sets firmly ground basic box on water tank, the high frequency shaking table, compare in current dam earthquake simulation shaking table experiment, creatively provides the low frequency vibration excitation for the water region, has realized the analog technology to the hydrodynamic pressure variation phenomenon among the seismic process. The method can solve the problem that the hydrostatic environment of the large-scale high dam body earthquake resistance test simulation device cannot completely reflect the variation of hydrodynamic pressure in the vibration process.

(2) The utility model discloses in the scheme of the high-frequency vibration platform that sets firmly on the low frequency shaking table, creatively combine together the characteristic of low frequency large stroke shaking table and high frequency small stroke shaking table, realized the high-low frequency loaded technique simultaneously of dam body and ground, can solve among the practical application big scale high dam body shock resistance test analogue means loading high-frequency vibration and do not influence the problem of simulation accuracy yet.

(3) The utility model relates to a controllable dam body antidetonation test analogue means of vibration frequency subregion can carry out the vibration excitation that different frequency was applyed in different regions to dam body antidetonation test analogue means, can be to water loading low frequency, to dam body loading high frequency and low frequency, need not the whole loading high frequency of high dam body antidetonation test analogue means of big scale to the test cost has been reduced.

Drawings

FIG. 1 is the three-dimensional axial side structure schematic diagram of the dam body earthquake resistance test simulation device with controllable vibration frequency partitions

FIG. 2 is the utility model discloses dam body anti-seismic test analogue means with controllable vibration frequency partition overlook the schematic diagram

3 FIG. 3 3 3 is 3 a 3 schematic 3 view 3 of 3 the 3 section 3 A 3- 3 A 3 in 3 FIG. 3 2 3

FIG. 4 is a schematic structural view of the section B-B in FIG. 3

FIG. 5 is a schematic structural view of the C-C section in FIG. 3

Wherein: 1-high frequency vibration table 2-low frequency vibration table 3-foundation box 4-damping boundary body 5-foundation 6-dam body 7-sealing connecting device 8-water tank 9-upstream water body region 10-downstream water body region 11-notch 12-sensor 13-data acquisition instrument

Detailed Description

The utility model relates to a controllable dam body antidetonation test analogue means of vibration frequency subregion mainly used big scale high dam antidetonation test analogue means to solve the unreasonable, the not enough, the high technical problem of simulation cost of simulation environment of big scale high dam design analogue test in the simulation test.

The technical solution of the present invention is further explained by the embodiments with reference to the accompanying drawings 1-5:

a dam body anti-seismic test simulation device with controllable vibration frequency partition comprises a data acquisition system, a vibration table module, a foundation box 3 fixedly arranged on the vibration table module, a foundation 5 fixedly arranged in the foundation box 3 and a dam body 6 fixedly arranged on the foundation 5; the vibration table module comprises a low-frequency vibration table 2 and a high-frequency vibration table 1 which is rigidly arranged on the low-frequency vibration table 2; the foundation box 3 is fixedly arranged on the high-frequency vibration table 1, the dam body 6 extends to the opposite side wall of the foundation 5 in the foundation box 3, and the space in the foundation 5 is divided into an upstream water body area 9 and a downstream water body area 10; the low-frequency vibration table 2 is further fixedly provided with a water tank 8, the water tank 8 and the foundation box 3 are arranged in parallel at intervals, the adjacent side surfaces of the water tank 8 and the foundation box 3 are respectively corresponding to a notch 11, the notch 11 is connected with the water tank 8 and the foundation box 3 through a sealing connection device 7, and an upstream water body area 9 of the foundation box 3 is communicated with the water tank 8 into a whole;

the upstream water body region 9 contains upstream water.

And a damping boundary body 4 is fixedly arranged between the foundation box 3 and the foundation 5 and is used for simulating the radiation damping effect of the foundation 5.

The sealing connection means 7 is a flexible sealing connection means.

The downstream water body region 10 contains downstream water at a lower level relative to the upstream water.

The notch 11 is in accordance with the shape of the foundation 5, and the upper end surface of the notch 11 is not lower than the surface of the foundation 5.

The data acquisition system comprises a sensor 12 and a data acquisition instrument 13, and data transmission of the sensor 12 and the data acquisition instrument 13 is cable transmission and/or wireless transmission.

The sensor 12 is one or more of a pore water pressure gauge and/or a soil pressure gauge distributed at the local part of the foundation 5, and an acceleration sensor, a speed sensor, a displacement sensor and a stress-strain sensor distributed at the local part of the dam body 6.

The technical solution of the present invention is explained in more detail below with reference to the accompanying drawings 1 to 5:

both the high frequency 1 and low frequency 2 vibration tables should include a vibration table top and an excitation force generator to provide excitation. In the technical field, the excitation force generator generally comprises an oil source energy supply system, a hydraulic cylinder loading system and a data control system. The embodiment adopts the conventional technical means: the oil source energy supply system provides energy for the reciprocating motion of the hydraulic cylinder, and the hydraulic cylinder pushes the vibration table and drives the test object on the vibration table to vibrate together; the data control system can monitor the vibration amplitude and frequency of the vibration table and carry out real-time iterative correction according to the monitoring data so as to ensure that the vibration time course of the vibration table is in accordance with expectations and the operation safety of the vibration table is ensured. The present embodiment includes two frequency output excitation force generators, which provide excitation for the high frequency vibration table 1 and the low frequency vibration table 2. The high-frequency vibration table 1 receives high-frequency small-stroke excitation, and the low-frequency vibration table 2 receives low-frequency large-stroke vibration excitation.

In the embodiment, the size of the table top of the low-frequency vibration table 2 is 20m multiplied by 15m, and the low-frequency vibration input below 25Hz is received; the table top of the high-frequency vibration table 1 is 6m multiplied by 10m in size and receives high-frequency vibration input of about 25-50 Hz; the high-frequency vibration table 1 and the low-frequency vibration table 2 are connected through bolts. The size of a foundation box 3 fixedly arranged on the high-frequency vibration table 1 is 6m multiplied by 7.5m multiplied by 10m, a foundation 5 and a dam body 6 are fixedly arranged in the foundation box 3, the dam height of the dam body 6 is 300m, tests are carried out according to a 1:80 scale, the dam height of the model dam body 6 is 3.75m, the depth, the upstream and downstream ranges of dam foundation soil bodies are 1 time of dam height, the ranges of the dam foundation soil bodies of the left and right banks are half times of dam height, and finally the total weight of the foundation box 3, the foundation 5 on the foundation box and the dam body 6 is 800 t. The 10 th order self-vibration frequency rate of the dam body 6 is about 5.0Hz, the calculation is carried out according to the gravity similarity criterion, and if the dynamic response of the order frequency is to be simulated, the high-frequency vibration table 1 needs to receive the vibration frequency input of 45 Hz; the high-frequency vibration table 1 in the device of the embodiment can meet the frequency requirement of the test; the frequency of the water body 9 required to be provided for the upstream water body area in the test is about 4.47 Hz-17.9 Hz, and the working frequency of the low-frequency vibration table 2 in the device can meet the frequency requirement of the test; during the test, the low-frequency vibration table 2 transmits the (earthquake) vibration wave input below 25Hz to the high-frequency vibration table 1, the high-frequency vibration table 1 independently provides the (earthquake) vibration wave input higher than 25Hz, and the (earthquake) vibration wave input is synthesized with the (earthquake) vibration wave transmitted by the low-frequency vibration table 2 and input to the bottom of the foundation 5; the foundation 5, the dam 6 thereon and the downstream water body 10 are all input by the synthesized (earthquake) vibration wave, wherein the downstream water body 10 is influenced by high-frequency vibration, but the influence on the overall test is limited due to the small water depth; the upstream water body 9 is not influenced by the high-frequency (earthquake) wave input of the high-frequency vibration table 1, and only influenced by the low-frequency (earthquake) wave input of the low-frequency vibration table 2, so that high-frequency and low-frequency partition simulation is realized. This simulation follows a near-real situation.

In the embodiment, the size of the water tank 8 for containing the upstream water is 6m × 7.5m × 6m, and the total weight of the water tank 8 and the water body is about 300 t.

In this embodiment, the damping boundary 4 is made of high polymer silicon rubber and is fixedly disposed between the contact surfaces of the foundation box 3 and the foundation 5.

In this embodiment, the foundation box 3 and the water tank 8 are respectively provided with notches 11. Notch 11 is opened on the ground case 3 that the parallel was placed, the just adjacent side of water tank 8, and is unanimous with the shape of ground, and notch 11 up end exceeds 5 surperficial take the altitude of ground (this embodiment exceeds 5 distance of ground and is the thickness of a water tank 8), for under the condition of guaranteeing 5 safety of ground, increase notch 11's opening area as far as possible, simulate the true condition, make things convenient for sealing connection device 7's installation simultaneously. The sealing connection device 7 is ensured to cross the sections of the notches 11 on the foundation box 3 and the water tank 8 on all cross sections, and two support legs of the sealing connection device 7 are respectively embedded into the foundation box 3 and the water tank 8 to ensure sealing.

The sealing connection device 7 is a flexible sealing connection device, and elastic parts such as a sealing ring and a rubber part or components containing the elastic parts can be adopted. This embodiment employs a waterstop.

In this embodiment, at least 1 sensor 12 is arranged on each dam section on the top of the dam body 6, and the sensors 12 may be one or any combination of an acceleration sensor, a velocity sensor and a displacement sensor; laying a stress-strain sensor at a proper position of a downstream dam face of the dam body 6; burying one or a combination of a soil pressure gauge and a void water pressure gauge at a proper position of the foundation 5; the data acquisition instrument 13 is matched and arranged according to the type of the sensor 12. In this embodiment, the data transmission between the sensor 12 and the data collector 13 is wired transmission.

High-frequency and low-frequency subarea simulation is carried out on water areas on two sides of the dam body 6, so that not only is the fine simulation of earthquake dynamic response realized, but also the technical requirements on the aspects of size, load and the like of a high-frequency vibration table are reduced to a certain extent, and further a model test with a larger scale can be realized.

In the embodiment, the test object on the high-frequency vibration table 1 is simultaneously loaded with high-frequency excitation and low-frequency excitation in a mode that the high-frequency vibration table 1 is arranged on the low-frequency vibration table 2; meanwhile, the low-frequency excitation is reserved for the test object directly fixed on the low-frequency vibration table without applying high-frequency excitation, and further the partition controllability of the vibration frequency is realized. The high and low frequencies are relative, and the high and low limits of the frequencies are different for different test objects, depending on the specifications of the specific vibration table size, load and its corresponding excitation frequency.

In practical application, the vibrating tables with different frequencies are distributed in various combination forms, can be distributed in an overlapping way, can be distributed independently, and the like; if necessary, vibration tables with more than two frequencies can be adopted to be combined and arranged in various forms according to specific tests. The change of the various combination layout forms of shaking table module all belongs to the utility model discloses an within the scope of protection.

The above is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. The present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive. Those skilled in the art can now make numerous changes in the form and arrangement of parts without departing from the spirit and scope of the invention as defined by the appended claims. All be through the simple transform of structure and spare part among the prior art to reach the utility model discloses a purpose all belongs to the utility model discloses a protection scope.

Claims

1. A dam body anti-seismic test simulation device with controllable vibration frequency partition comprises a data acquisition system, a vibration table module, a foundation box (3) fixedly arranged on the vibration table module, a foundation (5) fixedly arranged in the foundation box (3), and a dam body (6) fixedly arranged on the foundation (5);

the method is characterized in that:

the vibration table module comprises a low-frequency vibration table (2) and a high-frequency vibration table (1) which is rigidly arranged on the low-frequency vibration table (2); the foundation box (3) is fixedly arranged on the high-frequency vibration table (1), the dam body (6) extends to the opposite side wall of the foundation (5) in the foundation box (3) to separate the space in the foundation (5) into an upstream water body area (9) and a downstream water body area (10);

the low-frequency vibration table (2) is further fixedly provided with a water tank (8), the water tank (8) and the foundation box (3) are arranged in parallel at intervals, the adjacent side surfaces of the water tank (8) and the foundation box (3) are respectively corresponding to a notch (11), the notch (11) is connected with the water tank (8) and the foundation box (3) through a sealing connection device (7), and an upstream water body area (9) of the foundation box (3) is communicated with the water tank (8) into a whole;

upstream water is contained in the upstream water body area (9).

2. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 1, wherein: and a damping boundary body (4) is fixedly arranged between the foundation box (3) and the foundation (5) and is used for simulating the radiation damping effect of the foundation (5).

3. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 1, wherein: the sealing connection device (7) is a flexible sealing connection device.

4. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 1, wherein: the downstream water body area (10) is filled with downstream water with a lower water level relative to the upstream water.

5. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 1, wherein: the notch (11) is consistent with the shape of the foundation (5), and the upper end face of the notch (11) is not lower than the surface of the foundation (5).

6. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 1, wherein: the data acquisition system comprises a sensor (12) and a data acquisition instrument (13), and data transmission of the sensor (12) and the data acquisition instrument (13) is cable transmission and/or wireless transmission.

7. The dam body earthquake-proof test simulation device with the controllable vibration frequency partition according to claim 6, wherein: the sensors (12) are one or more of a pore water pressure gauge and/or a soil pressure gauge distributed at the local part of the foundation (5), and an acceleration sensor, a speed sensor, a displacement sensor and a stress-strain sensor distributed at the local part of the dam body (6).