摘要
为查明贵阳不同碳酸盐母岩风化红黏土物理力学性质差异原因,取贵阳市不同碳酸盐母岩风化的原状红黏土样品6份,进行固结不排水剪(CU)、无侧限抗压强度(QU)、固结压缩、X射线衍射(XRD)、X射线荧光光谱(XRF)、电子扫描显微镜(SEM)、能谱扫描(EDS)、颗粒分析等试验研究。结果表明:两种红黏土(粒径大于250μm)的体积分数具有明显差异,且灰岩风化红黏土中含有铁橄榄石,不含绿泥石,白云岩风化红黏土与之相反;两种红黏土的微观结构、排列方式和孔隙类型具有明显差异;物理性质指标除相对体积质量外,其余指标都是灰岩风化红黏土的大于白云岩风化红黏土的;灰岩风化红黏土的压缩性小于白云岩风化红黏土的,但灰岩风化红黏土的抗剪强度和抗压强度都大于白云岩风化红黏土的,尤其在含水率35%和55%时最为明显。研究结果可为今后红黏土的改性加固研究及工程建设提供依据和指导。
In order to find out the physical and mechanical properties of weathered red clay from different carbonate parent rocks in Guiyang,six undisturbed red clay samples with different parent rock weathering were taken and tested to conduct the study including consolidation undrained shear(CU),unconfined compressive strength(QU),consolidation compression,X-ray diffraction(XRD),X-ray fluorescence spectrum(XRF),electron scanning microscope(SEM),energy spectrum scanning(EDS)and particle analysis.The results showed that there was a significant difference in the volume fraction of the two kinds of red clay whose particle size was more than 250μm,and the weathered red clay of limestone contained ferroolivine and did not contain chlorite,while the weathered red clay of dolomite was on the contrary;There were obvious differences in microstructure,arrangement and pore type between the two red clays;The other physical indicators of limestone weathered red clay were larger than dolomite weathered red clay except the specific gravity;The compressibility of limestone weathered red clay was lower than that of dolomite weathered red clay,but the shear strength and compressive strength of limestone weathered red clay were higher than that of dolomite weathered red clay,especially when the water content was 35%and 55%.The research results could provide basis and guidance for the research of modification and reinforcement of red clay and the engineering construction in the future.
作者
谢延江
王中美
孙乾征
杨洲
付海
XIE Yanjiang;WANG Zhongmei;SUN Qianzheng;YANG Zhou;FU Hai(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2021年第4期98-106,共9页
Journal of Henan Polytechnic University（Natural Science）
基金
贵州省科学技术厅社会发展科技攻关项目(黔科合支撑[2017]2866)
贵州省科技计划联合基金资助项目(黔科合LH字[2017]7284号)
贵州省科学技术厅科技平台及人才团队计划项目(黔科合平台人才〔2017〕5402号)。
关键词
贵阳红黏土
物质组成
微观结构
物理性质
力学性质
差异
Guiyang red clay
material composition
microstructure
physical property
mechanical property
difference
