000004935 001__ 4935 000004935 005__ 20141119144606.0 000004935 04107 $$aeng 000004935 046__ $$k2002-06-02 000004935 100__ $$aIskander, Magued 000004935 24500 $$aDISPLACEMENT FIELD MEASUREMENT IN TRANSPARENT SOILS 000004935 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference 000004935 260__ $$bColumbia University in the City of New York 000004935 506__ $$arestricted 000004935 520__ $$2eng$$aModel tests to measure three-dimensional deformation patterns within a soil mass are limited by the fact that soil sensors do not provide a continuous image of the measured continuum. Additionally, soil sensors exhibit static and dynamic characteristics, which are different from those of the surrounding soils, and therefore can change the response of the measured continuum. The fundamental premise of this research is that transparent synthetic soil surrogates can be used to overcome these difficulties using optical techniques. Transparent synthetic soil models are formed using transparent particles made of amorphous silica powders or gels and pore fluid of matching refractive index. A system consisting of a laser source and a line-generating lens was used to optically slice transparent synthetic soil models. A digital camera was used to capture speckle images of the laser slices before and after deformation. Next digital image correlation (DIC) was performed by comparing the two images to obtain the displacement field in the transparent soil model. The accuracy of the DIC technique was evaluated. An example model consisting of a strip footing on transparent amorphous silica gel is presented, where spatial deformations in the model were measured using the proposed methodology and compared to finite element analysis. 000004935 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000004935 653__ $$aModel tests, Soil deformation, Tomography, Optical, Spatial, Cross Correlation, Silica 000004935 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002 000004935 720__ $$aIskander, Magued$$iSadek, Samer$$iLiu, Jinyuan 000004935 8560_ $$ffischerc@itam.cas.cz 000004935 8564_ $$s1452408$$uhttps://invenio.itam.cas.cz/record/4935/files/580.pdf$$yOriginal version of the author's contribution as presented on CD, . 000004935 962__ $$r4594 000004935 980__ $$aPAPER