摘要
通过对黏土质砾土样进行室内物理力学试验,研究了黏土质砾抗剪强度和承载强度的主要影响因素。研究表明,细粒土含量、含水率对黏土质砾土样的黏聚力、内摩擦角和加州承载比CBR强度有显著影响。含水率研究范围覆盖最佳含水率和天然含水率。随着细粒土含量增多,黏聚力逐渐增大,而内摩擦角逐渐减小;随含水率增大,黏聚力和内摩擦角均减小,细粒含量增多对黏聚力下降明显,而对内摩擦角影响较小;细粒土含量越多,CBR越小;当含水率超过最大CBR含水率时,击实功效果随含水率增大逐渐减弱,细粒土含量越多,不同击实功之间差异性越小。建立了黏聚力、内摩擦角及CBR同含水率和细粒土含量的关系,提出的经验公式可为现场填料的强度预估提供理论依据。
The main factors influencing the shear strength and bearing strength of clay-gravel mixture were studied by laboratory physical and mechanical tests.The results show that fine grained soil content and water content have significant effects on cohesion,internal friction angle and CBR of the samples.The water content in study covers optimal water content and natural water content.With the increase of fine grained soil content,the cohesion increases and the internal friction angle decreases.With the increase of water content,the cohesion and internal friction angle decrease,but the cohesion with more fine particle content has a significant effect,while the internal friction angle has a small effect.The higher the content of fine soil,the smaller the CBR;when the water content exceeds the maximum CBR water content,the effect of compaction work gradually decreases with the increase of water content.The more the content of fine soil,the smaller the difference between different compaction work.The relationships of cohesion,internal friction angle and CBR with water content and fine soil content were established.The empirical formula presented can provide theoretical basis for the strength prediction of fillers in the field.
作者
刘峥嵘
刘江鑫
蔡利平
万齐
宋常军
LIU Zhengrong;LIU Jiangxin;CAI Liping;WAN Qi;SONG Changjun(Hunan Hengyong Expressway Construction and Development Co.,Ltd.,Hengyang,Hunan 421600,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《公路工程》
2023年第4期127-133,共7页
Highway Engineering
基金
湖南省交通科技项目(202214)。
关键词
黏土质砾
抗剪强度
加州承载比
细粒土含量
含水率
clay-gravel mixture
shear strength
CBR
fine grained soil content
water content
