粗粒料级配缩尺中相似比例对密度影响的试验研究  

Experimental study on influence of similar proportion on density in grading scale of coarse-grained material

作　　者：万其微 刘斌云[1] 张延亿[2] 温彦锋[2] 邓刚[2] 赵梦阳 WAN Qiwei;LIU Binyun;ZHANG Yanyi;WEN Yanfeng;DENG Gang;ZHAO Mengyang(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《水利水电技术》2020年第6期157-163,共7页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目课题(2018YFC1508502,2017YFC0404803);中国水科院基本科研业务费项目(GE0145B562017);中国华能集团总部科技项目(HNKJ17-H18)。

摘　　要：针对粗粒料密度研究中变量复杂问题,为探究不同相似比例n值对试验材料密度变化的影响规律,以红石岩堰塞坝料的两条代表性级配为研究对象,在相同的试验条件和参数标准下,分别研究不同变量指标对密度的影响。结果显示:最大干密度和最小干密度均随相似比例n值的增加呈先增加后减小的变化趋势;同时,由于相似比例n值的不同引起了其它级配特征值的变化,材料P5含量在小于30%范围内变化时对最大干密度的影响较为明显,随P5含量的增大呈增大趋势;Cu/Cc对密度的影响与P5相似,下凹型级配中最大干密度和最小干密度随中值粒径d50增大呈先增大后减小,总体趋于减小的变化规律。结果表明:相似比例n值会影响材料之间粗细颗粒的填充关系,对下凹型级配曲线密度产生明显影响,对平均级配曲线影响较小,室内试验时需选择适宜的相似比例。In order to explore the law of the influences from the different similar proportion n values on the density variation of the experimental materials for the problem of that the variables are complicated in the study of the density of the coarse-grained material,the influences from the different indexes of the variables on the density are respectively studied under the same experimental condition and the parameter criteria by taking two representative gradations of the materials of Hongshiyan Barrier Dam as the study objects.The result shows that the maximum and the minimum dry densities both exhibit the changing trends of increasing at first and then decreasing later along with the increases of the similar proportions.Meanwhile,due to the changes of the other grading characteristic values caused by the difference between the similar proportion n values,the influence from the change of the P5 content in the material within the range less than 30% on the maximum dry density is more significant and exhibits an increasing trend along with the increase of the P5 content.The influence from Cu/Cc on the density is similar to that of the P5,while both the maximum and the minimum dry densities in the concave gradation exhibit that increasing at first and then decreasing later along with the increase of the median particle size d50 and tend to the changing trend of decrease generally.The result indicates that the similar proportion n value can influence the filling relationship of coarse and fine particles between the materials and has significant influence on the density of the concave gradation curve with less influence on the mean gradation curve,thus a suitable similar proportion is necessary to be selected in the indoor experiment concerned.

关 键 词：粗粒料 级配缩尺 相似比例 最大干密度 最小干密度 试验 影响因素 

分 类 号：TU411[建筑科学—岩土工程]