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AN INTEGRATED STUDY OF GEOTECHNOLOGY AND SEDIMENTARY ENVIRONMENT IN BRACKISH AREAS

咸水地区岩土技术与沉积环境综合研究

基本信息

批准号：
10650486
负责人：
KAMEI Takeshi
金额：
$ 1.54万
依托单位：
SHIMANE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

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.

本研究整合了日本西南部出云平原全新世沉积物的地质历史、地球化学（硫、氮和有机碳浓度）和岩土特征。全新世沉积物中总硫（TS）、总氮（TN）和总有机碳（TOC）的关系可用来表征沉积环境，即正常海水、微咸水、淡水和富氧沉积物。有机碳与黄铁矿硫的重量比（C/S比）可用于评价沉积环境。为此目的，CNS元素导致更好地了解沉积环境。此外，还介绍了出云平原的地貌过程与全新世海平面变化的关系，以及天然粉土和粘土沉积物中方解石（CaCO_（23）O_（23）O_（22））含量随深度的变化及其对强度-变形特性的影响。作为这项工作的结果，已经建立了出云地区粘性土的CaCO_2D_23_2D_2含量与强度-变形特性之间的定量关系，即，强度-变形特性随土壤中CaCO_（23）O_（23）O_（23）D_（22）含量的增加而增强。本文试图说明全新世沉积环境、岩土工程、地貌过程综合研究的重要性以及CNS元素分析的有用性。这项研究使设计师更好地了解全新世沉积物的力学行为，从而改进现有的施工技术。