基于级配方程的粗粒土渗透系数经验公式及其验证  

Empirical formula for permeability coefficient of coarse grained soil based on gradation equation and its verification

作　　者：包孟碟[1,2] 朱俊高[1,2] 吴二鲁 王龙[1,2] 陈鸽 BAO Meng-die;ZHU Jun-gao;WU Er-lu;WANG Long;CHEN Ge(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Jiangsu Research Center for Geotechnical Engineering Technology,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210024

出　　处：《岩土工程学报》2020年第8期1571-1576,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2018YFC1508505);国家自然科学基金委员会–雅砻江流域水电开发有限公司雅砻江联合基金项目(U1865104);国家自然科学基金项目(51479052)。

摘　　要：粗粒土广泛应用于土石坝工程和道路工程,其渗流特性关系到工程的稳定性和安全性,渗透系数是衡量其渗流特性的基本参数,其中级配是影响渗流的关键影响因素。为研究级配对粗粒土渗透系数的影响,基于已有研究的渗透试验成果,采用连续级配方程对级配连粗粒土试验级配进行定量描述,研究级配与渗透系数的关系,建立了考虑级配曲线面积的渗透系数经验公式,并用现有其它文献的渗透试验成果验证所建立公式的适用性。结果表明,采用连续级配方程可以较好地定量描述级配连续粗粒土的级配曲线;基于级配面积建立的渗透系数经验公式适用于不同最大粒径及不同级配的粗粒土。The coarse-grained soil is widely used in earth-rock dams and road projects.Its seepage characteristics are related to the stability and safety of the projects.The permeability coefficient is the basic parameter of seepage characteristics,and the gradation is the key factor affecting seepage.In order to study the effect of gradation on the permeability coefficient of the coarse-grained soil,based on the results of permeability tests in the existing literatures,a continuous gradation equation is used to describe the gradation of quantitatively graded coarse-grained soil,the relationship between the gradation and the permeability coefficient is studied,and an empirical formula for the permeability coefficient considering the area of gradation curve is established,and other literatures are used to study the relationship between the gradation and the permeability coefficient.The results show that the gradation curve of graded continuous coarse-grained soil can be quantitatively described by the continuous gradation equation,and the empirical formula for the permeability coefficient based on gradation area can be applied to the coarse-grained soil with different maximum particle sizes and gradations.

关 键 词：粗粒土 级配方程 渗透系数 级配曲线面积 适用性 

分 类 号：TU43[建筑科学—岩土工程]