考虑含石量与颗粒级配特征影响的土石混合体抗剪强度特性研究  

Research on Shear Strength Characteristics of Soil-rock Mixture Considering the Influence of Rock Content and Particle Gradation

作　　者：罗亚琼[1] 张超 马婷婷 LUO Ya-qiong;ZHANG Chao;MA Ting-ting(Department of Structural Engineering,Chongqing Creation Vocational College,Chongqing 402100,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Chongqing Yubei Vocational Education Center,Chongqing 402100,China)

机构地区：[1]重庆科创职业学院建筑工程系,重庆市402100 [2]湖南科技大学土木工程学院,湘潭市411201 [3]重庆市渝北职业教育中心,重庆市402100

出　　处：《公路》2022年第12期47-53,共7页Highway

基　　金：湖南省自然科学基金项目,项目编号2018JJ3163;湖南省教育厅科学研究项目,项目编号18C0356。

摘　　要：土石混合体抗剪强度特性是高填路堤填筑设计与计算的重要依据,目前尤其缺乏考虑含石量和颗粒级配特征等关键性参数影响的抗剪强度特性变化规律研究。选用实际路基工程中红黏土-角砾混合体,采用室内大型直剪仪,通过控制单一变量方式,探讨含石量、不均匀系数和曲率系数对土石混合体抗剪强度特性的影响规律。结果表明:土石混合体抗剪强度受多因素共同控制,其中含石量是关键因素;随着不均匀系数的增大,抗剪强度先增大后减小,黏聚力先减小后增大,内摩擦角先增大后减小;随着曲率系数的增大,抗剪强度、黏聚力和内摩擦角均不断减小。The shear strength characteristics of soil-rock mixture are an important basis for the design and calculation of high fill embankment. At present, especially the variation law of shear strength characteristics considering the influence of key parameters such as stone content and particle grading characteristics is lacking. In this paper, the red clay-breccia mixture in the actual subgrade engineering is selected, and the indoor large-scale direct shear instrument is used to explore the effects of stone content, non-uniformity coefficient and curvature coefficient on the shear strength characteristics of soil-rock mixture by controlling a single variable. The results show that the shear strength of soil-rock mixture is controlled by many factors, and the rock content is the key factor;with the increase of non-uniformity coefficient, the shear strength first increases and then decreases, the cohesion first decreases and then increases, and the internal friction angle first increases and then decreases;and with the increase of curvature coefficient, the shear strength, cohesion and internal friction angle decrease continuously.

关 键 词：路基工程 土石混合体 大型直剪试验 含石量 颗粒级配特征 抗剪强度 

分 类 号：U416.11[交通运输工程—道路与铁道工程]