多孔混凝土基层层流状态临界水力梯度研究  

Study on critical hydraulic gradient of streamline flow for porous concrete permeable base

作　　者：郑木莲[1] 陈拴发[1] 王秉纲[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《西安建筑科技大学学报（自然科学版）》2008年第4期457-461,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：交通部西部交通科技建设项目(200631800005);"十一五"国家科技支撑计划项目(2006BAF02A00)

摘　　要：渗透系数是表征多孔混凝土排水性能直接有效的指标,为应用Darcy定律测试多孔混凝土的渗透系数,必须首先给出Darcy定律对多孔混凝土的适用范围.从Darcy试验定律引出渗透系数的概念,分析了渗透系数的物理基础.通过类比管道流和多孔介质中的流动,提出Darcy定律对于多孔介质中流动的分类方法.利用自行研制的渗透仪,根据渗流速度与水力梯度的相关关系,得出为满足层流状态,不同级配、不同水泥用量多孔混凝土水力梯度的临界值,并提出常用配合比多孔混凝土的临界水力梯度建议值.Permeability coefficient is the directly effective target attributing the drainage performance of porous concrete. The application condition must be drawn before using Darcy Law to test the permeability coefficient of porous concrete. Authors of this paper deduced the concept of permeability coefficient from Darcy Law, analyzed the physics base, and put forward the classification method of flow in porous medium through comparing the flow in pipe with the porous medium. According to the relationship between permeability velocity and hydraulic gradient, the critical hydraulic gradient of porous concrete with different gradation and different cement dosage is adopted to meet streamline flow by the permeameter developed by themselves, and put forward the suggested value of critical hydraulic gradient for concrete of common mixture ratio.

关 键 词：道路工程 多孔混凝土 Darcy定律 渗透系数 渗透仪 临界水力梯度 

分 类 号：U414.18[交通运输工程—道路与铁道工程]