Predicting system of Shirasu slope failure in southern Kyushu

九州南部Shirasu边坡失稳预测系统

• 批准号: 12792009
• 负责人: KITAMURA Ryosuke
• 金额: $ 9.73万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for University and Society Collaboration
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12792009/
• 关键词: Prediction of slope failure; Field measurement; Unsaturated Shirasu; Suction; Remote sensing; Numerical & mechanical model; Probability of slope failure; Weathering matters; 斜面崩壊; シラス斜面; 斜面安定解析; 防災戦略; しらす斜面; 不飽和土; せん断強度パラメータ

This research aims to predict the place time and scale of slope failures due to rainfall in the southern part of Kyushu Island. The research project is mainly divided into three parts, i.e., (1) the in-situ and laboratory tests to make clear the inherent causes of slope failure due to rainfall, (2) field measuring system to acquire the information of rainfall, suction and temperature in soil that relate to the induced causes due to rainfall, and (3) numerical models to simulate the slope condition concerning the water content.To identify the dangerous places of slope failure the remote sensing technology was applied with the quantitative theories. The X ray reflection method was used to investigate the weathering process. The chemical analysis of pyroclastic flow deposits made clear the order of eruptions and sediments around Kagoshima Bay area.The field measurement of rainfall, suction and temperature in soil made clear the process of infiltration of rain and evaporation of pore water on Shirasu slope.The numerical experiments were carried out to simulate the condition of slope concerning the water content and proved the validity of numerical models which developed for this research.

这项研究旨在预测九州岛南部因降雨而发生滑坡的地点、时间和规模。研究项目主要分为三个部分，即(1)现场和室内试验，以弄清降雨导致边坡失稳的内在原因；(2)现场测量系统，获取与降雨诱发原因有关的土壤中的降雨、吸力和温度信息；(3)数值模型，模拟边坡的含水率状况。用X射线反射法对风化过程进行了研究。火山碎屑流沉积的化学分析清楚了鹿儿岛湾地区周围喷发和沉积的顺序；土壤中降雨、吸力和温度的现场测量清楚了雨水在石拉苏斜坡上的入渗和孔隙水的蒸发过程；数值试验模拟了坡面含水率的变化情况，验证了为本研究开发的数值模型的有效性。

项目成果

小島尚人: "衛星リモートセンシングデータを導入したシラス自然斜面の崩壊危険箇所評価精度の向上"土木学会論文集. No.707/VI-55. 165-176 (2002)

Naoto Kojima：“使用卫星遥感数据提高自然斜坡上容易发生故障的区域的评估准确性”，日本土木工程师学会会议记录第 707/VI-55 号（2002 年）。

Kitamura et al.: "Seepage & failure test on Shirasu slope by soil tank"Proc. Sympo. on mechanism of slope failure and its risk evaluation due to rainfall. JGS. 39-48 (2003)

Kitamura 等人：“渗漏

Kobayashi et al.: "Two large-scale earthquakes triggered by a 6.5 ka BP eruption from Kikai caldera, southern Kyushu, Japan"The Quaternary Research. 41(4). 287-299 (2002)

Kobayashi 等人：“日本九州南部 Kikai 火山口 6.5 ka BP 喷发引发的两次大规模地震”第四纪研究。

北村良介,坂元竜太,落合英俊,高田誠: "鹿児島県出水市でのサクションの現地計測"第19回日本自然災害学会年次講演会. 23-24 (2000)

Ryosuke Kitamura、Ryuta Sakamoto、Hidetoshi Ochiai、Makoto Takada：“鹿儿岛县泉市吸力的现场测量”第 19 届日本自然灾害学会年会 23-24（2000 年）。

松尾和昌: "斜面崩壊予知戦略-南九州シラス地帯を例として-"自然災害科学. 21-1. 25-33 (2002)

松尾一正：“边坡失稳预测策略——以九州南部白洲地区为例——”《自然灾害科学》21-1（2002）。