Device for measuring anisotropy of solid-liquid phase transformation stress and wave velocity of soil liquefaction in centrifugal field

Abstract

The invention discloses a device for measuring the anisotropy of solid-liquid phase transformation stress and the wave velocity of soil liquefaction in a centrifugal field. The device includes a base,the base includes a bottom plate and a vertical plate perpendicular to the bottom plate, a pore water pressure sensor, a horizontal soil pressure sensor and a vertically arranged piezoelectric ceramic shear wave velocity test part are arranged at the top of the bottom plate, and a vertical soil pressure sensor and a horizontally arranged piezoelectric ceramic shear wave velocity test part are arranged on the side wall of the vertical plate. Compared with the prior art, the device has the beneficial effects that the difficulties of high stress and high electromagnetic interference in the centrifugal field are effectively overcome, the measurement accuracy is high, and the errors are less, and test results have high reliability.

Description

technical field [0001] The invention relates to the technical field of geotechnical centrifugal model tests, in particular to a test device for joint measurement of the dynamic evolution of foundation stress anisotropy and elastic modulus anisotropy during earthquake liquefaction solid-liquid phase transition in a centrifugal field, belonging to a measurement and A test device for evaluating the static and dynamic properties of soil. Background technique [0002] Liquefaction is a typical seismic geotechnical engineering disaster. During the liquefaction process, the soil has a phase transition between solid and liquid. my country is located between the circum-Pacific seismic belt and the Eurasian seismic belt, with complex structures and frequent seismic activities. At the same time, liquefiable soils are distributed in most parts of my country, which means that the challenge of seismic liquefaction faced by my country is very severe. Therefore, it is extremely necessary t...

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Problems solved by technology

[0007] But this device has the following disadvantages: (1) the state of the soil in the device is significantly different from the real foundation

(2) The sealing of the loading plate is difficult to guarantee, and the waterproof problem cannot be solved, so the device cannot be applied to the field of seismic liquefaction of saturated sandy soil

(3) The friction between the soil inside the container and the side wall of the consolidation tester cannot be ignored, which reduces the reliability of the test results

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