AN INTEGRATED STUDY OF GEOTECHNOLOGY AND SEDIMENTARY ENVIRONMENT IN BRACKISH AREAS

本研究综合了地质历史、地质化学（硫化物、硝基和有机碳集中）和日本西南伊苏莫平原大屠杀沉积物的地质技术特征。Total sulfur（TS）、total nitrogen（TN）和total organic carbon（TOC） relationships in Holocene sedements have been to characterize depositional environments， namely normal marine， brackish water， freshwater and euuxinic sedements。有机碳与燃烧硫酸盐的重量比率（C/S比率）是用来评估环境的。到目前为止， CNS基本已经得到了更好地理解环境的支持。Izumo平原的几何学过程，由于对全息物的海平面变化的重视，也被描述为添加，数据对计算（CaCO-y D23-y D2）中的自然淤泥和粘土部分及其深度及其对强度变形特征的影响的内容。CaCO-D23-D2内容和强度变形特征的定量关系，Izumo地区的相干土壤已被开发为这一工作的一个结果，即，strength-deformation characteristics increase as the CaCOy D23 y D2 content of the sils increases.We have attempted in this paper to demonstrate the importance of integrated studies of sidimentary environments， geotechnology， geomorphological processes during the Holocene and the usefulness of CNS elementary analysis。本研究提供了一个更好的基于全息沉积物的机械行为的设计，并导致对现有建筑技术的完善。

This study integrates geological histories, geochemistry (sulfur, nitrogen and organic carbon concentration) and geotechnical characteristics of Holocene deposits in the Izumo Plains, southwest Japan. Total sulfur(TS), total nitrogen(TN) and total organic carbon(TOC) relationships in Holocene sediments have been used to characterize depositional environments, namely normal marine, brackish water, freshwater and euxinic sediments. The weight ratio of organic carbon to pyrite sulfur (C/S ratio) is useful for evaluating sedimentary environments. To this end, CNS elemental has led to a better understanding of sedimentary environments. The geomorphological processes of Izumo Plains with respect to sea level change during the Holocene is also described.In addition, data regarding calcite(CaCOィイD23ィエD2) content within natural silt and clay sediments with depth and its effect on strength-deformation characteristics is presented. Quantitative relationships between CaCOィイD23ィエD2 content and strength-deformation characteristics for cohesive soils of the Izumo area have been developed as a result of this work, i.e., strength-deformation characteristics increase as the CaCOィイD23ィエD2 content of the soils increases.We have attempted in this paper to demonstrate the importance of integrated studies of sedimentary environments, geotechnology, geomorphological processes during the Holocene and the usefulness of CNS elemental analysis. This study offers the designer a better understanding of mechanical behavior of Holocene deposits, leading to refinement of existing construction technology.