Method for testing underground structure response model under direct ground impact action

Abstract

The invention discloses a method for testing an underground structure response model under a direct ground impact action. The method comprises the following steps: firstly, calculating out a dynamic response of a prototype structure under the direct ground impact action through theoretical calculation or numerical simulation, and determining power responses of a model size and a model structure under the direct ground impact action by the prototype structure and a reduced scale factor S; setting a reduction coefficient [mu] and charging mass, calculating a distance R between the model structure and a charging center, and judging a load type through a ratio of load action time to a natural vibration period of the structure; when an external load is a transient impulse load, calculating a reduction coefficient [mu] value according to a reduction coefficient value reference graph, and if the calculation is false, recalculating the distance R; and when the external load is a load with longaction time, assuming a distance R value to calculate a maximum value delta m of deformation of the model structure, and adjusting the explosive distance R according to whether the calculated maximumvalue delta m is consistent or not. According to the method, the limitation of laboratory places and equipment is reduced, and the test cost and the potential safety hazards are reduced.

Description

technical field [0001] The invention relates to a response model test method of an underground structure under direct impact, which can provide a theoretical basis and a test method for the implementation of the model test of an underground complex structure or a large component under the impact load of the ground, 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-by-year population growth and the constraints of land resources, the city's transportation and ecological environment are facing huge challenges. In order to overcome the above problems, underground structures such as subways and underground shopping malls have emerged one after another, and the underground space has been fully expanded and applied. However, due to its airtightness and difficulty in rescue, underground buildings have...

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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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