【作者】 应涛涛； 龚礼岳； 吴则祥； 苏张凡； 刘海涛； 魏良针；

【Author】 YING Taotao;GONG Liyue;WU Zexiang;SU Zhangfan;LIU Haitao;WEI Liangzhen;Wenzhou Mass Transit Railway Investment Group Co.,Ltd;Collage of Architecture and Civil engineering,Wenzhou University;

【机构】 温州市铁路与轨道交通投资集团有限公司； 温州大学建筑与土木工程学院；

【摘要】 细粒含量对土石二元混合体的物理力学特征有着重要的影响。本文基于二元混合介质堆积理论,提出了一种简单的非线性最小二乘法,用于校准和确定岩土二元混合体的最大和最小孔隙比以及阈值孔隙比等材料参数,并计算细粒含量对岩土二元混合体摩擦角的影响。首先,对人工配制的粗砂与细砂混合体的最小和最大密度进行了试验,并基于二元堆积理论对最大最小孔隙比进行预测,得到了细粒含量的阈值。此外,获得了临界内摩擦角(或临界应力比)与细粒含量之间的关系。结果表明,基于二元堆积理论对最大最小孔隙比的预测较为准确,且细粒含量对土石混合体的内摩擦角有较大影响。更多还原

【Abstract】 Fines content has an important effect on the physical and mechanical characteristics of the binary mixture.In this study,a simple nonlinear least square method is proposed based on the binary packing theory to calibrate and determine material parameters,such as the maximum and minimum void ratio and threshold void ratio of mixtures.Then the influence of fines content on the friction angle is calculated.First,the minimum and maximum density of sand particles were tested,and the maximum and minimum void ratio was predicted based on the binary accumulation theory.Then,the threshold value of the fine content was obtained.In addition,the relationship between the critical internal friction angle(or critical stress ratio) and the fines content is obtained.The results show that the prediction of the maximum and minimum void ratio based on the binary accumulation theory is relatively accurate,and the fine content has a great impact on the internal friction angle of the soil-rock mixture.更多还原