反滤层设计原理与准则  

Design principles and guidelines of filters

作　　者：刘杰[1] 谢定松[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100048

出　　处：《岩土工程学报》2017年第4期609-616,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划("973"计划)项目(2014CB047004)

摘　　要：太沙基反滤层设计准则为反滤层的研究奠定了基础,对均匀无黏性土有足够的安全性,但对不均匀无黏性土是不安全的,而且不适用于其它类型的土料。阐述了在太沙基准则的基础上对渗透破坏型式各异的各种类型土反滤准则的研究结果,提出了不同类型土控制粒径确定的原则与方法,扩大了准则的适用范围。试验研究结果表明,不均匀无黏性土的反滤层,应当保护其中的细颗粒不流失,试验研究了确定细料的原则与方法,采用细料中的d_(70)为控制粒径,并回归为整个土体控制粒径的确定方法,最后给出了各类土保护细料的的反滤层设计准则。该研究成果可为实际工程的反滤层设计提供借鉴和指导意义。The design criteria of Terzaghi filter layer have laid the foundation for the researches on filter layers, which are safet enough for uniform cohesionless soil, but not secure for uneven cohesionless soil, and they are not suitable for other types of soil. The existing research results are reviewed based on the design criteria of Terzaghi filter layer for various types of filters with different permeability damages. The control principles and methods are put forward to determine the control grain sizes of different types of soil so as to expand the scope of the criteria. The research results show that for the uneven non-viscous filter layer of soil, the fine particles should be protected. Some experiments are performed to confirm the principles and methods to get the particle sizes of the fine materials. In the process of experiments, Using d_（70） of fine materials to be the control grain size, and the regression method is used to get the results to determine the control grain sizes of the entire soil. Finally, the design criteria of filter layers for different kinds of soil are obtained. The results may provide reference and guiding significance for engineering design of practical filter layers.

关 键 词：反滤层 等效粒径 控制粒径 砾石土 无黏性土 

分 类 号：TV641[水利工程—水利水电工程]