In this paper,macro-and micro-properties of natural marine clay in two different and representative regions of China are investigated in detail.In addition to in-situ tests,soil samples are collected by use of Shelby ...In this paper,macro-and micro-properties of natural marine clay in two different and representative regions of China are investigated in detail.In addition to in-situ tests,soil samples are collected by use of Shelby tubes for laboratory examination in Shanghai and Zhuhai respectively,two coastal cities in China.In the laboratory tests,macro-properties such as consolidation characteristics and undrained shear strength are measured.Moreover,X-ray diffraction test,scanning electron microscope test,and mercury intrusion test are carried out for the investigation of their micro-properties including clay minerals and microstructure.The study shows that：（1）both clays are Holocene series formations,classified as either normal or underconsolidated soils.The initial gradient of the stress-strain curves shows their increase with increasing consolidation pressure;however,the Shanghai and the Zhuhai clays are both structural soils with the latter shown to be more structured than the former.As a result,the Zhuhai clay shows strain softening behavior at low confining pressures,but strain hardening at high pressures.In contrast,the Shanghai clay mainly manifests strain-hardening.（2）An activity ranges from 0.75 to 1.30 for the Shanghai marine clay and from 0.5 to 0.85 for the Zhuhai marine clay.The main clay mineral is illite in the Shanghai clay and kaolinite in the Zhuhai clay.The Zhuhai clay is mainly characterized by a flocculated structure,while the typical Shanghai clay shows a dispersed structure.The porous structure of the Shanghai clay is characterized mainly by large and medium-sized pores,while the Zhuhai clay porous structure is mainly featured by small and medium-sized pores.The differences in their macro-and micro-properties can be attributed to different sedimentation environments.展开更多
微政务作为迅速发展的跨学科研究领域,已经初步形成了完整的知识体系。本文选取2010-2016年间WOS(Web of Science数据库)、CNKI(中国知网)以微政务为关键词的期刊论文,以文献计量学为基础理论和方法,以Cite SpaceⅢ为数据分析和可视化工...微政务作为迅速发展的跨学科研究领域,已经初步形成了完整的知识体系。本文选取2010-2016年间WOS(Web of Science数据库)、CNKI(中国知网)以微政务为关键词的期刊论文,以文献计量学为基础理论和方法,以Cite SpaceⅢ为数据分析和可视化工具,通过高频关键词的时区图和网络图、学科分布图、期刊分布图等,对比分析了国内外微政务研究所处的研究阶段与发展脉络、研究流派与主体、研究主题与方法,并提出了未来的研究趋势。展开更多
基金supported bythe National Natural Science Foundation of China(Grant No.50679057)the National High Technology Research and Development Program of China(863 Program,Grnat No.2006AA11Z102)+1 种基金the Shanghai Pujiang Program(Grant No.06PJ14088)the Zhuhai city Science Technology Program(Grant No.PA200310064)
文摘In this paper,macro-and micro-properties of natural marine clay in two different and representative regions of China are investigated in detail.In addition to in-situ tests,soil samples are collected by use of Shelby tubes for laboratory examination in Shanghai and Zhuhai respectively,two coastal cities in China.In the laboratory tests,macro-properties such as consolidation characteristics and undrained shear strength are measured.Moreover,X-ray diffraction test,scanning electron microscope test,and mercury intrusion test are carried out for the investigation of their micro-properties including clay minerals and microstructure.The study shows that：（1）both clays are Holocene series formations,classified as either normal or underconsolidated soils.The initial gradient of the stress-strain curves shows their increase with increasing consolidation pressure;however,the Shanghai and the Zhuhai clays are both structural soils with the latter shown to be more structured than the former.As a result,the Zhuhai clay shows strain softening behavior at low confining pressures,but strain hardening at high pressures.In contrast,the Shanghai clay mainly manifests strain-hardening.（2）An activity ranges from 0.75 to 1.30 for the Shanghai marine clay and from 0.5 to 0.85 for the Zhuhai marine clay.The main clay mineral is illite in the Shanghai clay and kaolinite in the Zhuhai clay.The Zhuhai clay is mainly characterized by a flocculated structure,while the typical Shanghai clay shows a dispersed structure.The porous structure of the Shanghai clay is characterized mainly by large and medium-sized pores,while the Zhuhai clay porous structure is mainly featured by small and medium-sized pores.The differences in their macro-and micro-properties can be attributed to different sedimentation environments.
文摘微政务作为迅速发展的跨学科研究领域,已经初步形成了完整的知识体系。本文选取2010-2016年间WOS(Web of Science数据库)、CNKI(中国知网)以微政务为关键词的期刊论文,以文献计量学为基础理论和方法,以Cite SpaceⅢ为数据分析和可视化工具,通过高频关键词的时区图和网络图、学科分布图、期刊分布图等,对比分析了国内外微政务研究所处的研究阶段与发展脉络、研究流派与主体、研究主题与方法,并提出了未来的研究趋势。
