A physical model layered preparation and test method for controlling soil state parameters

Abstract

The invention discloses a physical model layered preparation and test method for controlling soil state parameters. Carry out indoor triaxial test and basic physical property test on the test soil; place the model box on the shaking table, place the test soil in the model box, determine the test geometric similarity scale; determine the centrifugal acceleration; set the layered layers of the prototype and the model The state of the prototype at the center of each layer of soil is obtained according to layered processing, and the state of the model at the center of each layer of soil is obtained through iterative processing; the model is prepared; the waveform parameters input by the shaking table and the viscosity of the saturated fluid used in the test are determined; Shaking table test to obtain the model response results and deduce the prototype response results. The invention overcomes the defects of soil response distortion in traditional small-scale unequal stress model tests, overcomes the problems of insufficient load capacity of existing centrifuges and insufficient performance of supergravity shaking tables, improves the scale range, and accurately simulates the strain level of the prototype.

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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