摘要
针对粉细砂在银川地区分布广泛,埋藏浅,土层深厚,细粒含量变化大,部分具有轻微湿陷性等特点,以银川地区粉细砂为对象,干密度,含水率和细粒含量为因素,设计正交试验方案,应用全自动气压固结仪,试验研究了细粒含量对粉细砂压缩性和和压缩水敏性的影响,分析了各因素的作用规律及其显著性,结合土的颗粒组成和矿物组成分析了作用机理。研究结果表明:干密度增大能显著降低细砂的压缩性和压缩水敏性,随含水率和细粒含量增加,细砂的压缩性增大,而压缩水敏性降低,显著性由高到低顺序为干密度,含水率和细粒含量,提高密实度和含水率是降低细砂压缩水敏性的有效措施。
Because the fine sand in Yinchuan area is widely distributed and shallow buried with thick layers,the fine particle content varied greatly and some sand has a slight collapsibility,by taking the dry density,moisture content and fine grain content as the factors,the orthogonal experiment scheme was designed to study the effects of fine particle content on the compressibility and compressive water sensitivity of the fine sand through the automatic air pressure consolidation apparatus. Then the mechanism of each factor and its significance were analyzed in consideration of particle size and mineral composition. The results show that the increase of dry density can significantly reduce the compressibility and compressive water sensitivity of the fine sand. With the increase of water content and fine grain content,the compressibility of fine sand increases but the water sensitivity decreases. The dry density has the most significance,followed by the moisture and finally the fine particle content. An effective measure to reduce the sand compressibility and watersensitivity is increasing the density and moisture content.
作者
杨瑞雪
崔自治
郄玥颖
马俊斌
李英男
YANG Rui-xue;CUI Zi-zhi;QIE Yue-ying;MA Jun-bin;LI Ying-nan(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2018年第3期1143-1148,共6页
Journal of Guangxi University（Natural Science Edition）
基金
教育部"长江学者和创新团队发展计划"(IRT1067)
国家大学生创新训练项目(X201710749357)
关键词
粉细砂
细粒含量
压缩系数
压缩水敏性
fine sand
fine grain content
compressive coefficient
compressive water sensitivity
