A layered vibrating shear soil box test device

Abstract

The invention discloses a layered vibration shearing soil box test device, which comprises a shearing soil box, a vibration device and a driving device. The shearing soil box includes a frame layer. The frame layers are connected longitudinally by lockable and loosenable sliders and linear guide rails, and horizontally connected by rebound leaf springs and hemispherical column hinges. The frame layer is placed on the bottom plate of the vibrating device. The pleated rubber membrane is arranged inside the soil cutting box, and the pleats are inserted into the gap between the frame layers and the bottom plate; the bottom plate of the vibrating device is supported on the bottom beam through leaf springs and springs respectively, and the bottom plate also has a bottom plate hole for installing permeable stones. The beam is fixed on the laboratory floor; the driving device includes an electric servo actuator set on the end face of the I-shaped steel beam and a force sensor connected with it, and the former is installed on the reaction wall by a connecting plate. This device can simulate the propagation process of shear wave in the soil layer with limited thickness during the earthquake. The layered vibrating shear soil box overcomes the limitation of the base shear force of the general shaking table, and has the advantages of simple structure, economical cost, convenient installation and application. features.

Description

technical field [0001] The invention relates to a layered shear test device for civil engineering tests, in particular to a layered vibration shear soil box test device. Background technique [0002] Further studies on the amplification effect of infinite soil sites under the action of earthquake vibrations, the dynamic characteristics of soil and the interaction between soil and structures are of great significance in geotechnical earthquake engineering. To study soil properties, such as stress-strain relationships and liquefaction, experimental studies on small numbers of soil samples are often carried out in laboratories using triaxial compressometers, single shear devices, and torsional shear tests under regular or irregular dynamic loads. In these types of tests, stresses and deformations in the soil foundation are significantly affected by boundary conditions. In addition, due to the limitations of the test loading device and sample size, there are differences between...

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Problems solved by technology

[0004] The shortcomings of the devices used in previous studies are: (1) the layered shear box cannot simulate the response characteristics of the soil under vibration; (2) in order to adapt to the shear capacity of the base of the shaking table, the shear box The size is too small; (3) The layer gap between the frame layer and the layer of the shear box is too large, which cannot well simulate the simple shear test of the soil under vibration; (4) The vibration test of the shear box must rely on the shaking table, The test is limited by the vibration capacity of the shaking table and the test cost is too high

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