透明土物理模拟试验技术现状与趋势
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TD313

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国家自然科学基金高铁联合基金重点支持项目(U1934210);北京市自然科学基金资助项目(8202037);中央高校基本科研业务费专项资金资助项目(2020YJS126,2020JBM126)


The present and development trend of physical simulation experiment technology for transparent soils
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    摘要:

    透明土物理模拟试验技术是研究解决岩土工程基础科学与工程技术问题的重要手段之一,了解并掌握其当前技术现状与发展趋势对透明土物理模拟试验技术应用及进一步发展都有重要的指导作用。本文对当前透明土物理模拟试验技术的基本原理、主要内容、工程应用以及当前存在问题与未来发展趋势进行了系统归纳与总结分类。通过探索研究:发现利用激光制斑的透明砂土可以二次复用,极大的降低了实验成本;在透明度确定的原则下可以适当增大模型尺寸以减小边界效应带来的负面影响;在保证模型透明度的前提下,可以适量保留模型内部空气以提高模型各项异性和非均质性。未来,利用人工制斑和数字照相量测技术相结合有望实现模型双轴或真三轴加载,建议对透明土试样的力学特性进行定性化分类与定量化测试相结合,以便建立一套与天然土体力学特性相对应的完整指标系统。

    Abstract:

    Physical simulation experiment technology for transparent soils is one of the important means to study and solve the problem of geotechnical engineering science and technology. Understanding and mastering the present technology development status has an important guiding role to the application and development of future physical simulation experimental technology for transparent soils. In this paper, the basic principle, main contents, engineering application, the current problems and future development trends of the physical simulation test technology for transparent soils was systematic induction and summary classification. Through exploratory research, the transparent sand for laser speckle can be reused, which greatly reduces the experimental cost. The size of model can be increased appropriately under the principle of transparency to reduce the negative influence of the boundary effect. In order to improve the anisotropy and heterogeneity of transparent soil samples, an appropriate amount of air inside the model can be retained on the premise of ensuring the transparency of the model. In the future, the biaxial or true triaxial loading of physical model can be realized by using artificial speckles and digital photographic measurement technology. It is suggested that the engineering properties of transparent soils samples was qualitatively classified and quantitatively tested, and a complete index system was established which corresponding to the mechanical properties of nature soil.

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杜建明,房倩,刘翔,等. 透明土物理模拟试验技术现状与趋势[J]. 科学技术与工程, 2021, 21(3): 852-861.
Du Jianming, Fang Qian, Liu Xiang, et al. The present and development trend of physical simulation experiment technology for transparent soils[J]. Science Technology and Engineering,2021,21(3):852-861.

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  • 收稿日期:2020-05-14
  • 最后修改日期:2020-10-22
  • 录用日期:2020-07-04
  • 在线发布日期: 2021-02-09
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