碎石土管涌判断准则的研究  

Criterion for the Piping of Gravely Soils

作　　者：严佳捷 柳彤晖 YAN Jiajie;LIU Tonghui(Fujian Geotechnical Engineering Survey and Research Institute Co.Ltd.,Fuzhou 350108)

机构地区：[1]福建岩土工程勘察研究院有限公司,福州350108

出　　处：《土工基础》2025年第1期67-72,共6页Soil Engineering and Foundation

摘　　要：目前关于无粘性土稳定的判定准则过于广泛,对碎石土的适用性仍有待商榷,基于碎石土渗流稳定性试验数据,分析常用的3种无粘性土管涌判定准则(H/F准则、Wan&Fell准则、细颗粒含量准则)对碎石土管涌判定的适用性,结合数据统计及理论分析确定影响碎石土管涌的主控因素,改进常用准则并提出适用于碎石土管涌判定的准则。研究结果表明,无粘性土常用判定准则对碎石土的误判率较高;判定准则受多种土体结构因素作用,影响碎石土管涌的主要因素为不均匀系数、孔隙度、颗粒粒径范围占比等;当碎石土不均匀系数大于80、小于20时,不均匀系数为影响碎石土管涌的主导因素,当土体不均匀系数在20~80之间时,不同粒径范围占比为主要影响因素,用于计算判定准则界限粒径的粒径分布特性参数随不均匀系数和不同颗粒直径范围占比改变。At present,the judgment criteria for the stability of the cohesionless soil are too broad,and the applicability to grav-elly soil is still to be discussed.Therefore,based on the gravely soil seepage stability test data,the applicability of three com-monly used judgment criteria for the cohesionless soil piping(H/F criterion,Wan&Fell criterion,and fine particle content criterion)to the determination of gravely soil piping is analyzed,and the main control factors affecting gravely soil piping are determined by combining data statistics and theoretical analysis.The commonly used criteria are improved and the criteria ap-plicable to the determination of the gravely soil piping are proposed.The research results show that the common judgment cri-teria for cohesionless soil have a high rate of misjudgment for gravelly soil.The judgment criteria are affected by a variety of soil structure factors,and the main factors that affect the piping of the gravely soil are the nonuniformity coefficient,porosity,the proportion of particle size range,etc.When the nonuniformity coefficient of the gravely soil is greater than 80 and less than 2o,the nonuniformity coefficient is the dominant factor that affects the piping of gravely soil.When the nonuniformity coeffi-cient of soil is between 20 and 80,the proportion of different particle size ranges is the main influencing factor.The particle size distribution characteristic parameters used to calculate the boundary particle size of the judgment criteria change with the non-uniformity coefficient and the proportion of different particle size ranges.

关 键 词：碎石土 数理统计 无粘性土准则 管涌 

分 类 号：TU441[建筑科学—岩土工程]