Dam body shock test simulation device with controllable vibration frequency zoning

Abstract

The invention belongs to the technical field of earthquake engineering simulation research, and discloses a dam body shock test simulation device with controllable vibration frequency zoning. The simulation device mainly comprises a data acquisition system, a vibration table module, a foundation box, a foundation and a dam body, wherein the vibration table module comprises a high-frequency vibration table and a low-frequency vibration table; the dam body receives transmitted low-frequency and high-frequency synthesized vibration; a water tank communicated with the foundation box in a flexiblesealing manner is fixedly arranged on the low-frequency vibration table; the dam body divides communicated zones into upstream and downstream water body zones; the upstream water body zone is arrangedon one side of the water tank; upstream water in the upstream water body zone receives low-frequency vibration; the low-frequency vibration acts on the dam body; and a damping boundary body is arranged between the foundation box and the foundation. The device adopts high- and low-frequency vibration zoning simulation, so that dam body shock test simulation more meets an actual use condition of alarge-scale high dam; obtained test data tends to be reasonable and accurate; and the test cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of earthquake engineering simulation research, and relates to a dam body seismic test simulation device with controllable vibration frequency divisions. Background technique [0002] In recent years, in order to adapt to the rapid development of my country's hydropower industry, a large number of high-dam water body areas have been built or started to be built. At present, among the top 100 dam heights in the world, my country accounts for 20, of which 14 are over 200m. It is not uncommon for water conservancy dams with dam heights over 300m to be found in my country. As my country's geographical structure runs through many earthquake zones, the seismic performance of dams is a very important assessment index in the design and construction of projects. It is related to the safety of dams, as well as the safety of life and property of downstream cities and population, especially High dam project. Therefore, ...

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Problems solved by technology

In an actual earthquake, the water body in the water body area is affected by the seismic vibration, and the simple still water environment cannot fully reflect the hydrodynamic pressure changes during the earthquake; however, if the water body area is scaled down, a scaled model is established, and the Above the vibration table, the size of the vibration table is required to be larger, the load capacity is stronger, and the vibration frequency range is wider, which in turn will restrict the scale ratio of the simulation test;

[0006] 2. For high dams, there is a big contradiction between the loading frequency and the geometric size and load

Earthquakes may affect the tenth-order self-vibration frequency of the dam. If a large-scale shaking table is used for simulation, the size can be enlarged and the simulation accuracy can be improved, but high-frequency loading cannot be performed; if a small-scale shaking table is used for simulation, high-frequency loading can be performed , but the geometric size is small and the simulation accuracy is limited;

[0007] 3. The frequency of the water body in the water body area is generally 1-2 Hz. In the dam body seismic test simulation device, the water body area adopts the same high-frequency loading as the dam body, which will undoubtedly greatly increase the simulation cost, and the simulation effect will not be greatly improved.

[0008] In order to reasonably, efficiently and economically conduct seismic test simulations for dam body design under large-scale conditions, it is urgent to develop a method that can load high frequencies on the dam body and low frequencies in the water body area to simulate the actual use as accurately as possible. In order to solve the technical bottleneck of the seismic test simulation test of the large-scale high dam test model

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