粗粒料的单参数级配方程及其适用性研究  

Single-parameter gradation equation for coarse-grained soil and its applicability

作　　者：吴二鲁 朱俊高[1,2] 王龙 陈鸽[1,2] WU Er-lu;ZHU Jun-gao;WANG Long;CHEN Ge(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Jiangsu Research Center for Geotechnical Engineering Technology,Hohai University,Nanjing,Jiangsu 210098,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,江苏南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210098

出　　处：《岩土力学》2020年第3期831-836,共6页Rock and Soil Mechanics

基　　金：国家重点研发计划项目(No.2018YFC1508505);中央高校基本科研业务费专项资金资助(No.2018B668X14);江苏省研究生科研与实践创新计划项目(No.KYCX18_0566);国家自然科学基金委员会−雅砻江流域水电开发有限公司联合基金(No.U1865104);国家自然科学基金(No.51479052);111计划项目(No.B13024)。

摘　　要：提出了一个适用于描述粗粒料连续级配的单参数级配方程,研究了方程的基本性质,分析了方程对连续级配粗粒料两种典型级配曲线的反映能力,利用多个土石坝工程粗粒料级配曲线验证该方程的适用性,推导了方程表示良好级配的参数范围。结果表明:提出的级配方程能够描述反S形和双曲线形两种典型的粗粒料级配曲线。方程参数β的范围为(0,1),当β值较小时,方程表示的级配曲线为双曲线形;当β值较大时,方程表示的级配曲线为反S形。提出的级配方程对土石坝工程中各种粗粒料的级配具有较好的适用性。与分形级配方程和连续级配方程相比,该单参数级配方程更具有实用价值。当β>0.13时,方程表示的级配为良好级配,该范围的确定可以为筑坝粗粒料的级配设计提供依据。A gradation equation with one parameter is derived to describe continuous gradation of coarse-grained soil.The basic properties of the gradation equation are studied,and the ability of the gradation equation to reflect two typical gradation curves of continuous gradation is analyzed.The applicability of the gradation equation is verified by several gradation curves of coarse-grained soil used in earth-rock dam engineering,and the range ofβdeduced for the gradation is well represented.The study shows that the gradation equation can reflect the two typical hyperbolic and sigmoidal,gradation curves.The range of gradation parameter is 0–1.the curve gradation equation expresses is hyperbolic for small value of the parameter,and is sigmoidal for large value of the parameter.The gradation equation widely applies for gradations of different coarse-grained soils used in earth-rock dam,and it is more practical than fractal gradation equation and continuous gradation equation.The equation parameter greater than 0.13 implies well representation of the gradation,which provides a basis for the gradation design of coarse-grained soil for earth-rock dam.

关 键 词：级配曲线 级配方程 粗粒料 适用性 单参数 

分 类 号：TU411[建筑科学—岩土工程]