利用人工合成透明土的岩土物理模拟试验

发布时间：2018-05-04 15:10

本文选题：岩土物理模拟 + 透明土　；参考：《岩土力学》2015年11期

【摘要】：结合粒子图像测速(PIV)和近景摄影技术,建立了一种利用人工合成透明土的岩土物理模拟试验方法,非侵入观测和记录了浅基础沉降(SFS)引起的土体变形,并与利用天然土的传统模型试验进行了对比研究。透明土是由与熔融石英的折射率相匹配的孔隙溶液组成。采用激光面照射透明土模型并拍摄下SFS引起变形的数字图像,利用基于MATLAB的Geo-PIV软件获得了所产生的位移场。试验结果对比分析显示:与天然砂土中的相比,在透明土中SFS引起的扰动区域较大,最大剪应变扩大了约1.5倍,表层隆起范围约增加了30~50%;然而透明土中土体单元的运动趋势总体上与天然砂土中的相似,表明所建立的试验方法在机制研究上具有一定程度的适用性。
[Abstract]:Combined with particle image velocimetry (PIV) and close-range photography, a geotechnical physical simulation test method using synthetic transparent soil was established. The deformation of soil caused by shallow foundation settlement was observed and recorded by non-invasive method. A comparative study was carried out with the traditional model test using natural soil. Transparent soil is composed of pore solutions that match the refractive index of fused quartz. The model of transparent soil irradiated by laser surface was used to capture the digital image of deformation caused by SFS, and the displacement field was obtained by using Geo-PIV software based on MATLAB. The comparative analysis of the test results shows that the disturbance area caused by SFS in the transparent soil is larger than that in the natural sand, and the maximum shear strain is about 1.5 times larger than that in the natural sand. The range of surface uplift increases about 30%, but the movement trend of soil element in transparent soil is similar to that in natural sand, which indicates that the established test method is applicable to some extent in mechanism research.
【作者单位】：宁波大学建筑工程与环境学院;浙江大学城市学院土木工程系;
【基金】：国家自然科学基金青年科学基金项目(No.51508282) 浙江省自然科学基金青年基金项目(No.LQ15E080002)~~
【分类号】：TU43

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