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.

本研究综合了日本西南部出云平原全新世矿床的地质历史、地球化学（硫、氮和有机碳浓度）和岩土工程特征，其中总硫（TS）、总氮（TN）和总有机碳（TOC）之间的关系。全新世沉积物已被用来表征沉积环境，即正常海洋、咸水、淡水和常生沉积物中有机碳与黄铁矿硫的重量比。（C/S 比）有助于评估沉积环境。为此，CNS 元素有助于更好地了解出云平原在全新世期间海平面变化的地貌过程。，提供了有关天然粉砂和粘土沉积物中方解石含量随深度的数据及其对强度-变形特征之间的影响的定量关系。这项工作的结果是出云地区粘性土的 CaCOiiD23ieD2 含量和强度-变形特征，即强度-变形特征随着土中 CaCOiiD23ieD2 含量的增加而增加。我们在本文中试图证明重要性这项研究提供了全新世沉积环境、地质技术、地貌过程的综合研究以及 CNS 元素分析的实用性。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。