Transparent Synthetic Soil and Its Application in Modeling of Soil-Structure Interaction Using Optical System
Transparent Synthetic Soil and Its Application in Modeling of Soil-Structure Interaction Using Optical System
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DOI：
10.3389/feart.2019.00276
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发表时间：
2019-10
影响因子：
2.9
通讯作者：
Bingxiang Yuan;Lei Xiong;Li-hua Zhai;Yuefeng Zhou;Gongfa Chen;X. Gong;W. Zhang
中科院分区：
文献类型：
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作者：
Bingxiang Yuan;Lei Xiong;Li-hua Zhai;Yuefeng Zhou;Gongfa Chen;X. Gong;W. Zhang
本文介绍了利用光学系统研究透明合成土在岩土工程问题中的应用，包括透明材料、样品制备、岩土性质、实验方法以及在物理模拟中的应用。介绍了四种典型的透明合成土，并进行了比较.对于无定形二氧化硅粉末，通常固结的无定形二氧化硅具有比天然粘土更高的归一化强度但更低的模量。对于无定形硅凝胶，无论是在密实状态还是在松散状态下，其应力-应变行为都与砂土的典型应力-应变行为一致。对于熔融石英，其抗剪强度和模量均高于天然砂;偏应力随围压的增大而增大，但熔融石英和天然砂的应力-应变曲线特别相似。对于玻璃砂，随着相对密度的增加，其应变-应力关系由应变硬化向应力软化转变，但其破坏形式与标准砂基本相同。根据四种典型透明合成土颗粒材料的岩土工程性质，采用不同的物理模型试验，模拟不同的工况，分析实际工程问题。该过程包括激光与透明颗粒相互作用产生的散斑图案的产生。利用数字图像处理技术，可以获得散斑图，并利用散斑图计算位移场。通过利用该光学系统，透明的合成土壤可用于非侵入性地调查内部土壤变形，流动问题，和地面运动的物理模型试验。最后分析了透明土试验技术的优缺点。
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 stress-strain 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 strain-stress 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 non-intrusively 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.