Evaluation of Sedimentary Environments of Holocene Deposits near Lake Jinzai in the Izumo Plain using CNS Elemental Analysis, and Its Application to Geotechnology.

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  • ＣＮＳ元素分析による出雲平野神西湖周辺の完新世堆積物の堆積環境評価とその地盤工学への応用
  • CNS ゲンソ ブンセキ ニ ヨル イズモ ヘイヤ ジンザイコ シュウヘン ノ カンシンセイ タイセキブツ ノ タイセキ カンキョウ ヒョウカ ト ソノ ジバン コウガク エ ノ オウヨウ

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This paper describes an integrated study on sedimentary environments of Holocene deposits near Lake Jinzai in the Izumo Plain using CNS elemental analysis and its application to geotechnology. The weight ratios of total organic carbon to pyrite sulfur (C/S ratio) and total organic carbon to total nitrogen (C/N ratio) and total sulfur (TS) are useful for evaluating sedimentary environment. The geological processes of the Lake Jinzai area during the Holocene is also described.<BR>In addition, the influence of variation of calcite (CaCO3) content on observed strength-deformation characteristics with depth is investigated. Quantitative relationships between CaCO3 content and strength-deformation characteristics for cohesive soils of the Lake Jinzai area have been developed as a result of this work, i. e, strength-defomation characteristics increase as the CaCO3 content of the soils increases. Finally, this study emphasizes to geotechnical engineers the necessity of integrated evaluation for the refinement of construction technology.

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