摘要
黄土作为一种孔隙结构发育的特殊土壤,具有渗透性、湿陷性、崩解性等特性,容易引发地面裂缝、地表的不均匀沉降等问题。通过氮气吸附、硬度测试和SEM等室内试验对不同掺量水泥黄土孔隙结构和强度特征进行研究。结果表明:随着水泥掺量的逐渐增大,黄土水泥复合材料总孔容逐渐降低,水泥掺量为25%时总孔容较水泥掺量为10%时降低了40%;黄土水泥复合材料压痕硬度和强度与水泥掺量存在明显的正相关性,通过SEM从微观角度直观分析得出黄土水泥复合材料是通过改变土体颗粒大小、形状、连接方式,胶结物填充状态等来改变原土体的物理力学性质。研究可为黄土地区注浆材料的研发提供技术参考。
As a special soil with a well-developed pore structure,loess has characteristics such as permeability,collapsibility,and disintegration,which can easily lead to problems like ground fissures and uneven settlement of the surface.The pore structure and strength characteristics of loess with different dosage of cement were investigated by indoor tests such as nitrogen adsorption,hardness test and SEM.The results showed that the total pore volume of loess cement composites gradually decreased with the gradual increase of cement content,and the total pore volume decreased by 40%at 25%cement doping compared with that at 10%cement content;The indentation hardness and strength of loess cement composites have obvious positive correlation with the cement content,and the physical and mechanical properties of the original soil are changed by changing the size,shape,connection and cement filling state of the soil particles through SEM.The study can provide a technical reference for the research and development of grouting materials in loess areas.
作者
宋连喜
王忠伟
李鹏飞
孙强
SONG Lianxi;WANG Zhongwei;LI Pengfei;SUN Qiang(National Energy Group Coal Coking Co.,Ltd.,Wuhai 016031,China;College of Mining,Liaoning Technical University,Fuxin 123000,China;Geological Research Institute for Coal Green Mining,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《粉煤灰综合利用》
CAS
2024年第4期47-52,共6页
Fly Ash Comprehensive Utilization
基金
国家自然科学基金(41972288)。
