基于颗粒堆积算法的堆石料压实密度预测研究  

Study on predicting the compacted density of rockfill materials based on the granular packing algorithm

作　　者：沈超敏[1,2] 邓刚 刘斯宏[1] 严俊[2] 毛航宇[1] 王柳江 SHEN Chaomin;DENG Gang;LIU Sihong;YAN Jun;MAO Hangyu;WANG Liujiang(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Construction and Safety of Water Engineering of Ministry of Water Resources,China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]中国水利水电科学研究院水利部水工程建设与安全重点实验室,北京100048

出　　处：《水利学报》2023年第8期920-929,共10页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(52009036,52209160,51979091);中国水利水电科学研究院水利部水工程建设与安全重点实验室开放研究基金项目(NO.202001)。

摘　　要：堆石料的压实密度是反映其工程力学特性的重要指标。提出了一种基于降维映射的颗粒堆积算法,仅有一个模型参数即可在给定堆石料级配的情况下实时预测当前级配下的最大干密度。与试验结果对比发现,该算法能够较好预测给定的连续、间断级配堆石料最大干密度,为堆石料级配的高效优化设计提供了新思路。采用该算法模拟了堆石料细料截断和缩尺对堆石料压实密度的影响,结果表明:本算法可以较好地根据缩尺后的结果预测原型级配的堆石料压实密度,但堆石料压实密度的缩尺效应预测存在细料截断误差,误差与细料含量呈正相关;堆石料缩尺后粗料部分骨架的孔隙尺寸降低,有降低压实密度的趋势,而缩尺时增加的细料含量对密度的影响并无统一的规律,而是与粗料和细料的具体粒径分布相关。The compacted density of rockfill materials is an important index to reflect their engineering and mechanical properties.A numerical granular packing algorithm,which is based on the dimension-reduction mapping and contains only one parameter,is proposed to determine the maximum density of rockfill materials in real time when the particle size distributions is given.Compared with the experimental results in the literature,the proposed algorithm can predict the maximum density of both well-graded and gap-graded rockfill materials,which provides a new idea for the effective optimization of the grading curve of rockfill materials.The effects of fines truncation and downscaling on the compacted density are analyzed using the proposed algorithm and it is found that:the proposed method can well predict the compacted density of the prototype rockfill materials based on the result of the downscaled sample.The performance of the prediction of the scale effect is influence by the fines truncation,and the error of the predicted compacted densify is proportional to the fines content;From the point of view of granular packing,the skeleton voids of coarse content decreases for the downscaled specimens,disfavoring the filling of fines,while the increasing fines content with the downscaling procedure has no consistent effect on the compacted density of rockfill materials,and depends on both the particle size distributions of both the coarse and fine particles.

关 键 词：堆石料 颗粒堆积 最大干密度 缩尺效应 级配曲线 

分 类 号：TU431[建筑科学—岩土工程]