宽级配弱固结土体内细颗粒迁移规律研究评述
发布时间:2018-06-20 01:13
本文选题:宽级配弱固结土 + 细颗粒迁移 ; 参考:《山地学报》2017年02期
【摘要】:宽级配弱固结土体中细颗粒的迁移是导致滑坡和泥石流的一个重要原因。本文总结了宽级配弱固结土和细颗粒分界粒径的基本概念,以及细颗粒迁移特性,并总结了现有细颗粒迁移在各学科研究的实验方法、数值模拟方法以及研究成果。现有研究表明在宏观尺度上,宽级配土体内细颗粒在水动力条件下的迁移,会导致土体孔隙堵塞,是土体渗透性的降低、发生滑坡泥石流的重要原因;同时亦影响水利科学中土石坝运行,甚至造成管涌破坏。在细观尺度上,相关成果仍旧不完善,亟待在今后进行深入研究。未来建议重点发展微观数值模拟技术,高精度的试验监测手段,并考虑孔隙结构和颗粒级配变化、细观-微观-宏观多尺度转换以及气、固、流多相流耦合条件下的细颗粒迁移规律。
[Abstract]:The migration of fine particles in wide gradation weakly consolidated soil is an important cause of landslide and debris flow. In this paper, the basic concepts of wide gradation weakly consolidated soil and fine particle boundary particle size, as well as the characteristics of fine particle migration are summarized, and the experimental methods, numerical simulation methods and research results of fine particle migration in various disciplines are summarized. The existing studies show that the migration of fine particles in the wide gradation soil under hydrodynamic conditions will lead to soil pore blockage, which is an important reason for the decrease of soil permeability and the occurrence of landslide and debris flow. At the same time, it also affects the operation of earth-rock dams in water conservancy science, and even causes pipeline failure. In the meso scale, the related results are still imperfect, and need to be further studied in the future. In the future, it is suggested that emphasis should be placed on the development of microscopic numerical simulation techniques, high-precision test and monitoring methods, taking into account changes in pore structure and particle gradation, meso-micro-macro multi-scale conversion, and gas, solid, etc. The migration of fine particles under the coupling condition of multiphase flow.
【作者单位】: 中国科学院山地灾害与地表过程重点实验室中国科学院水利部成都山地灾害与环境研究所;中国科学院大学;中国科学院青藏高原地球科学卓越创新中心;
【基金】:中科院国际合作局对外合作重点项目(131551KYSB20160002) 国家科技支撑项目(2014BAL05B01) 国际(地区)合作与交流项目(41520104002)~~
【分类号】:P642.2;TU43
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