A study on liquefaction of volcanic soils including a sedimentation of gravely debris avalanche

火山土液化包括砾石崩塌沉积的研究

• 批准号: 06680434
• 负责人: YASUDA Susumu
• 金额: $ 1.34万
• 依托单位: Tokyo Denki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680434/
• 关键词: Earthquake disaster; Liquefaction; Volcanic soil; Gravely soil

Liquefaction histories and strengths of several volcanic soils were studied. History of liquefaction at volcanic soils during past earthquakes in Japan was studied at first, by collecting reconnaissance reports and geological maps. It was demonstrated that liquefaction has been induced in the ground where volcanic ash, pumice and gravely debris avalanche were deposited. Existing boring data collected at the liquefied sites showed that liquefaction has occurred even though in gravely sand. Detailed soil investigation by borings, Swedish soundings and undisturbed samplings were carried out in Ebino City where liqufaction occurred during the Ebino earthquake at secondary sedimented pumice grounds. Undrain cyclic triaxial tests on undisturbed samples taken at several sites showed that liquefaction strength of secondary sedimented pumice is very low. Based on these studies, liquefiable areas where volcanic soils are sedimented during future earthquakes were pointed out.

对几种火山土的液化历史和强度进行了研究。首先，通过收集勘察报告和地质图，研究了日本历次地震期间火山土的液化历史。结果表明，在火山灰、浮石和严重的碎屑雪崩沉积的地面上发生了液化。在液化现场收集的现有钻探数据显示，即使在严重的沙子中也发生了液化。在埃比诺地震期间发生液化的埃比诺市，通过钻探、瑞典测深和原状取样进行了详细的土壤调查，次生沉积浮石场地。不排水循环三轴试验表明，二次沉积浮石的液化强度很低。在这些研究的基础上，指出了未来地震中火山岩土壤沉积的可液化区域。

项目成果

Wakamatsu K.: "Liquefaction case histories of volcanic deposits" Proc.,1st Int.Conf.on Earthquake Geotechnical Eng.(1995)

Wakamatsu K.：“火山沉积物的液化案例历史”Proc.，第一届地震岩土工程国际会议（1995）

永瀬英生: "2種類の火砕流堆積物の液状化特性" 第30回上質工学研究発表会講演集. (1995)

永濑秀夫：《两种类型火山碎屑流沉积物的液化特征》第30届质量工程研究会议论文集（1995）。

S.Yasuda: "Liquefaction of Volcanic Soils, Proc. of the Symposium on Volcanic Soils" The Japanese Geotechnical Society (in Japanese). 46-55 (1995)

S.Yasuda：“火山土壤的液化，火山土壤研讨会论文集”日本岩土工程学会（日语）。

安田 進: "火山性堆積物の液状化特性" 地盤工学会火山灰土の性質とその設計・施工シンポジウム. 46-55 (1995)

Susumu Yasuda：“火山沉积物的液化特征”火山灰土特性及其设计和施工研讨会，岩土工程师学会 46-55 (1995)。

安田進: "火山性堆積物の液状化特性" 地盤工学会火山灰土の性質とその設計・施工シンポジウム. 46-55 (1995)

Susumu Yasuda：“火山沉积物的液化特征”火山灰土特性及其设计和施工研讨会，岩土工程师学会 46-55 (1995)。