Transparent Synthetic Soil and Its Application in Modeling of Soil-Structure Interaction Using Optical System

Abstract

This article introduces the uses of transparent synthetic soil for geotechnical problems using optical system, including transparent materials, sample preparation, geotechnical properties, experimental methods, and applications in physical modeling. Four typical kinds of transparent synthetic soil are shown and compared. For amorphous silica powder, normally the consolidated amorphous silica has a higher normalized strength but a lower modulus than the natural clays. For amorphous silica gels, the stressstrain behaviors are consistent with the typical stress-strain behaviors of sand for both dense and loose conditions. For fused silica, it has a higher shearing strength and higher modulus than the natural sand does; the deviatoric stress increases with the confining pressure, but the stress-strain curves of fused silica and the natural sand are particularly similar. For glass sand, with increasing of the relative density, the strainstress relationship varies from strain hardening to stress softening, while its failure form is essentially the same as that of standard sand. According to the geotechnical properties of four typical materials of transparent synthetic soil grain, they are used to simulate different conditions and analyze practical engineering problems in different physical model tests. The process included the generation of a speckle pattern created by the interaction of laser light with transparent particles. Using digital image processing technology, speckle patterns can be obtained and used to calculate the displacement field. By utilizing this optical system, transparent synthetic soil can be used to nonintrusively investigate internal soil deformation, flow problems, and ground movement in physical model tests. Finally, both the advantages and disadvantages of the transparent soil experimental technique are analyzed.

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Study on Settlement and Deformation of Urban Viaduct Caused by Subway Station Construction under Complicated Conditions

“…e stability of rock strata and the safety of buildings in the intersecting area have become the focus and difficulty of research. More and more scholars will transfer the research center to the stability analysis of the building under the subway [7][8][9]. e stability analysis and emergency reinforcement treatment of the subway shield tunnel under existing structures are common.…”

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“…en, this frozen layer operates as a supporting and water insulation layer so that the tunnel can be excavated through the mining method. Although the artificial freezing method which is applied in cross passage freezing projects [9][10][11][12][13] is a relatively mature technology, further studies are required to determine the influence of different geological and surrounding environment conditions [14,15] on the key technical indices, including the thickness and average temperature of the frozen wall.…”