粗颗粒土击实特性试验研究  

Experimental Study on Compaction Characteristics of Coarse-grained Soil

作　　者：杨志浩 Yang Zhihao(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院

出　　处：《石家庄铁道大学学报（自然科学版）》2019年第3期24-26,33,共4页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：以优良路基填料级配碎石和细圆砾土为研究对象,通过自行改装的表面振动击实仪测定了粗颗粒土在干法、湿法以及在35 Hz和45 Hz击实频率条件下,不同击实振幅下的干密度,分析了干湿条件下粗颗粒土最大干密度随击实频率、击实振幅的变化规律。结果表明,采用湿法得到的最大干密度高于干法;存在一个最优的击实振幅,级配碎石最优击实振幅为1.4~1.6 mm,细圆砾土最优击实振幅为1.0~1.2 mm。小于最优振幅时,随振幅的增加,干密度增大;大于该振幅时,随振幅的增加,干密度反而减小。The graded crushed stone and fine-grained gravel were selected as the research object,and their dry density was measured at frequency of 35 Hz or 45 Hz under dry and wet conditions with the self-modified surface vibrating compactor.The change law of maximum dry density of coarse-grained soil with compaction frequency and amplitude under dry and wet conditions was analyzed.The results show that the maximum dry density obtained through the wet method is higher than that of the dry method.There is an optimal compaction amplitude.The optimal compaction amplitude of the graded crushed stone is between 1.4 mm and 1.6 mm,and 1.0 mm to 1.2 mm of the fine-grained gravel.The dry density increases with the increase of the amplitude when the amplitude is smaller than the optimal amplitude.The dry density decreases with the increase of the amplitude when the amplitude is larger than the optimal amplitude.

关 键 词：粗颗粒土 表面振动击实仪 最大干密度 击实振幅 

分 类 号：U215.2[交通运输工程—道路与铁道工程]