水利学报2016，Vol.47Issue(2)：200-208,218,10.DOI:10.13243/j.cnki.slxb.20150703
颗粒级配对管涌发展的影响试验研究
Experimental study of particle grading impact on piping mechanism
摘要
Abstract
Combined with fine measuring equipment, vertical seepage sand piping tests were carried out through a self-designed model slot. The geometry and hydraulic parameters of soils and the particles move⁃ment characteristics are obtained during the tests to study the particle grading impact on piping develop⁃ment and to explore the mesoscopic mechanism of piping. In piping type soils, the gradation of movable particles does not affect the final particles loss fraction, while the maximum size and distribution law of loss particles are influenced. Whether the seepage failure occurs or not and the corrosion process are affect⁃ed greatly by the movable particle content, and the critical content of movable particles and the self-filter⁃ing phenomenon should be considered fully. Through the stereo microscope, the self-filtering and self-stabi⁃lizing process internal the sand soil with critical content of fine particles is obtained during seepage from the mesoscopic view. It further reveals the interlayer value of D15/d85 resulting from interaction of soil and wa⁃ter is in line with the self-stabilizing gradation characteristics, which leads to the system self-stabilizing, In order to discriminate the seepage failure mode and critical hydraulic gradient magnitude in the case of sand with wide grade distribution and lack of middle size,it is necessary to carry out experimental demon⁃stration for the complex interaction of soil and water, according to the accrual grading feature of engineer⁃ing soils and the hydraulic conditions based on the traditional judgment formula or experience curves.关键词
砂土管涌/细观试验/颗粒级配/渗漏通道/层间系数/水土相互作用Key words
sandy piping/small scale model/particle grading/leakage/interlayer value/interaction of soil and water分类
建筑与水利引用本文复制引用
姚志雄,周健,张刚,吴波..颗粒级配对管涌发展的影响试验研究[J].水利学报,2016,47(2):200-208,218,10.基金项目
国家自然科学基金项目（50379037，51478118）；福建工程学院科研启动基金资助项目 （）
