Model test method for response of underground structures under direct impact

Abstract

The invention discloses a model test method for the response of an underground structure under the action of direct impact. Firstly, the dynamic response of the prototype structure under the action of direct impact is obtained through theoretical calculation or numerical simulation, and the size of the model is determined by the prototype structure and the scaling factor S respectively. and the dynamic response of the model structure under direct impact; set the reduction coefficient μ and the charge mass, calculate the distance R between the model structure and the charge center, and judge the load by the ratio of the load action time to the structure natural vibration period Type; when the external load is an instantaneous impulse load, the μ value needs to be calculated according to the reference diagram for the value of the reduction coefficient, and if the calculation is wrong, the R value needs to be recalculated; when the external load is a long-acting load, it needs to be calculated assuming the R value Maximum value δ of model structural deformation m , according to the calculation δ m Whether the value is consistent to adjust the explosion distance R. The invention reduces the limitations of laboratory sites and equipment, and reduces the test cost and safety hazard.

Description

Technical field[0001]The invention relates to an underground structure response model test method under direct impact, which can provide a theoretical basis and a test method for the implementation of a model test of an underground complex structure or a large component under a ground impact load, and belongs to the technical field of structural testing.Background technique[0002]With the development of social economy, the level of science and technology has been continuously improved. But at the same time, due to the year-on-year population growth and the constraints of land resources, urban transportation and ecological environment are facing huge challenges. In order to overcome the above-mentioned problems, underground structures such as subways and underground shopping malls have appeared one after another, and the underground space has been fully expanded and applied. However, underground buildings have become an important target of terrorist attacks due to their own airtightne...

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Problems solved by technology

[0004] Due to the complex physical properties of soil or rock, most of the current research is only on model explosion tests of above-ground structures, and there are few studies on model explosion tests of underground structures or components.

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