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《中国海洋工程(英文版)》 2009-02
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Macro-and Micro-Properties of Two Natural Marine Clays in China

JIANG Ming-jing a,PENG Li-cai a,b,ZHU He-hua a,LIN Yi-xi b and HUANG Liang-ji baDepartment of Geotechnical Engineering,Tongji University,Shanghai 200092,ChinabZhuhai Center for Supervision and Inspection on Quality of Infrastructure Engineering,Zhuhai 519015,China  
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.
【Fund】: 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);; the Shanghai Pujiang Program(Grant No.06PJ14088);; the Zhuhai city Science Technology Program(Grant No.PA200310064)
【CateGory Index】: P642.1
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