A large-scale quasi-static test device and method for soil-underground structure

Abstract

The invention discloses a large soil-underground structure pseudo-static test device and method. The device comprises a bottom plate, a rectangular laminar shearing box body, a lateral limiting framework, a horizontal loading system and a vertical loading system, wherein the rectangular laminar shearing box body comprises a rectangular steel framework and interlaminar rollers; the lateral limiting framework comprises steel stand columns, lateral universal rollers and tie bars; the horizontal loading system comprises horizontal actuators; the vertical loading system comprises vertical actuators, loading plates, top universal rollers and a top pressure-bearing steel plate. The vertical actuators apply vertical loads to the surface of a soil mass uniformly through the loading plate, the top universal rollers and the top pressure-bearing steel plates, and the rectangular laminar shearing box body generates horizontal displacement in a certain distribution form step by step by performing synchronous coordinate control on the horizontal loading system until an underground structure is damaged. The limit that the reduced scale in a test of a traditional underground structure anti-seismic model is small is eliminated, and the anti-seismic property of the underground structure under different vertical seismic motion is researched.

Description

technical field [0001] The invention relates to the technical field of underground structure tests, in particular to a large-scale quasi-static test device and method for soil-underground structures, and belongs to the technical field of seismic tests of underground structures. Background technique [0002] In recent years, with the continuous advancement of urbanization in various countries around the world, the urban population has expanded rapidly. In order to alleviate problems such as traffic congestion and environmental pollution, scholars at home and abroad have gradually realized that the development and utilization of underground space will become an important development direction. Underground structures have been more and more widely used in various fields such as urban construction, transportation, national defense projects, and water conservancy projects, such as railway tunnels, subway projects, underground shopping malls, and air defense projects. Practice sho...

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Problems solved by technology

Ordinary shaking table model tests are carried out under the gravitational acceleration environment of 1g. Since the geometric size of the model is reduced to a fraction of that of the prototype, under normal gravity conditions, the stress level of the model, especially the stress level of its own weight, is different from that of the prototype. There is a certain gap, which also leads to a certain gap between the ordinary shaking table test results and the actual situation.

The centrifuge shaking table model test is carried out under the environment of Ng gravity acceleration. At present, there are few centrifuge shaking table test equipment in my country, which directly restricts the development of the centrifuge shaking table test. In addition, the section size of the underground structure is generally large. However, the size of the vibrating table of the geotechnical centrifuge is relatively small. In some cases, the similar relationship of geometric dimensions cannot meet the requirement that the stress level of the prototype and the model are the same.

[0005] Generally speaking, the existing seismic model test devices for underground structures at home and abroad cannot accurately reflect the real seismic response of underground structures. In addition, due to the limitation of the test size, both the model making and processing before the test and the data processing after the test are limited. more difficult

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