Model differential settlement controlling device of geotechnical centrifuge test

Abstract

A model differential settlement controlling device of a geotechnical centrifuge test. Composition of the model differential settlement controlling device is as below: two rows of support piers are fixed on one side of a model box bottom, and a dead flat on the two rows of support piers is supported by the support piers; two rows of elevators are fixed on the other side of the box bottom, and flange plates on upper parts of the elevators are fixed with a lifting plate; an embankment model is filled on the dead flat and the lifting plate; and elevators are connected with a step servo motor through a steering box arranged on the model box bottom, and the step servo motor is electrically connected with an external control system of the geotechnical centrifuge. According to the apparatus, accurate control of model differential settlement can be realized under a centrifuge running state, so as to master transmission and diffusion rules of nonuniform deformation of foundation in embankment soil filling and influences of the nonuniform deformation of foundation on characteristics of road bed nonuniform settlement, so as to provide reliable test basis for improving uniform transitioning technology of different structures in railway and road engineering.

Description

Technical field [0001] The invention relates to a geotechnical centrifugal model test device, in particular to a model differential settlement control device for the geotechnical centrifugal model test. Background technique [0002] The railway and highway subgrade is a kind of belt-shaped structure. At the junction of the embankment and abutment, the junction of the subgrade and the lateral structure, the place where the foundation soil layer changes greatly, and the foundation treatment measures change, it is easy to produce differential settlement, resulting in track surface The unevenness of the road surface and the unevenness of the road cause severe vibration when the vehicle passes at high speed, which affects the comfort of riding and the stability of driving, and even endangers driving safety in severe cases. This differential settlement is mainly caused by the uneven deformation of the foundation. The transmission law of the uneven deformation of the foundation in the e...

AI Technical Summary

Problems solved by technology

At present, the commonly used simulation method for foundation differential settlement in geotechnical centrifugal model tests is: first fill model foundations with different strengths at the bottom of the model box, then place the model embankment on the model foundation, and apply centrifugal force to the model in the model box to cause different The model foundation with high strength produces differential deformation, which in turn causes uneven deformation of the model embankment fill and uneven settlement of the subgrade surface

Due to the poor controllability of the differential deformation of the model foundation with different strengths, it is impossible to accurately grasp the influence of the differential deformation of the foundation on the uneven deformation of the embankment filling and the uneven settlement of the subgrade surface

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