Physical model layered preparation and test method for controlling soil body state parameters

Abstract

The invention discloses a physical model layered preparation and test method for controlling soil body state parameters. The method comprises the steps of: carrying out an indoor triaxial test and a basic physical property test on the test soil body; placing the model box on the vibration table, placing a test soil body in the model box, and determining a test geometric similarity scale; determining centrifugal acceleration; setting the number of layers of the prototype and the model; obtaining the state of the prototype at the center of each layer of soil body according to layering processing, and obtaining the state of the model at the center of each layer of soil body through iterative processing; preparing a model; determining waveform parameters input by the vibration table and the viscosity of saturated fluid used for the test; and carrying out a vibration table test to obtain a model response result, and deducing to obtain a prototype response result. The defect of soil body response distortion of a traditional small-scale unequal-stress model test is overcome, the problem that an existing centrifugal machine is insufficient in load capacity and supergravity vibration tableperformance is solved, the scale reduction range is widened, and the strain level of a prototype is accurately simulated.

Description

technical field [0001] The invention belongs to the technical field of physical model test theory, and in particular relates to a layered preparation technology of a physical model for controlling soil state parameters and a test method thereof. Background technique [0002] At present, the construction of a large number of high dams and large reservoirs in Southwest my country, the construction of new feeder airports in mountainous areas, the construction of offshore ports and islands and reefs in the sea, and the construction of major infrastructure such as the "Sichuan-Tibet Railway" are all threatened by strong earthquakes. my country is one of the countries with the most active seismic activity and the most serious earthquake disasters in the world. In recent years, Wenchuan in Sichuan (Mg 8.0, 2008), Yushu in Qinghai (Mg 7.1, 2010) and Ya'an in Sichuan (Mg 7.0, 2013) have occurred in recent years. The earthquake caused damage to many large geotechnical structures (such ...

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Problems solved by technology

[0006] In order to solve the problems existing in the high-gravity physical model test of large-scale geotechnical engineering problems in the background technology, the present invention discloses a physical model layered preparation and test method for controlling soil state parameters, mainly considering the control of the soil state constituting the model To control the stress-strain relationship and dilation / shrinkage of the soil, the model can realize equal strain simulation, which can solve the technical problem of directly carrying out model tests for large-scale complex geotechnical engineering problems

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