Development of Hybrid Monitoring System for Early Detection of Earthquake Damage to Lifeline

开发混合监测系统以早期发现地震对生命线的损害

• 批准号: 08650545
• 负责人: MIYAJIMA Masakatsu
• 金额: $ 1.34万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650545/
• 关键词: Lifeline; Early Detection of Earthquake damage; Monitoring; Liquefaction; Water Supply System; Strong Ground Motion Records

This study deals with development of hybrid monitoring system of ground motion and lifeline facilities for early detection of their earthquake damage. First, the monitoring of ground failure, especially soil liquefaction was studied because liquefaction was one of the most crucial geotechnical hazards during an earthquake. In this study, strong ground motion records were used for detection of liquefaction. Amplitude characteristics of strong ground motion records were investigated. The time histories of the ratio of vertical ground acceleration to horizontal one was calculated from the strong ground motion records in liquefied and non-liquefied areas. As the ratio increased after the liquefaction occurred, the ratio seems to be one of the indices of detection of liquefaction. Frequency characteristics of the strong ground motion records were also studied. The running spectra and time histories of the predominant fequency of the strong ground motion records in liquefied and non-liquefie … More d areas were calculated. The decrease rate of the predominant frequency is the one of indices of detection of liquefaction.Next, the methodology for estimation of spatial liquefaction potential was proposed. The method was a geostatistical procedure which was called as Kriging technique using semi-variogram. This method was applied to estimation of liquefied sites by using the data obtained from boreholes at limited sites in Niigata, Noshiro and Kobe cities. The areas where the liquefaction occurred during the 1964 Niigata, 1983 Nihonkai Chubu and 1995 Hyogoken Nambu earthquakes, respectively, could be predicted relatively well.Furthermore, the optimum monitoring sites for lifeline facilities were investigated by case study of Kanazawa city. The critical points of pipeline network were clarified by the flow analysis after an earthquake, then the important sites for monitoring were determined in considering the crucial bases after an earthquake such as a general hospital, shelter, and so on. Less

本研究涉及开发地震动和生命线设施的混合监测系统，以早期发现地震损坏。首先，研究了地面破坏特别是土壤液化的监测，因为液化是地震期间最重要的岩土灾害之一。本研究利用强地震动记录进行液化检测，研究了液化强地震动记录中垂直地面加速度与水平加速度之比的时程。随着液化发生后比例的增加，该比例似乎是检测液化的指标之一，并对主要地震动记录的运行谱和时程进行了研究。计算了液化区和非液化区强地震动记录的频率，主频率的下降率是液化检测的指标之一。提出了利用半变异函数进行空间液化潜力估计的地质统计学方法，该方法利用从新泻、能代和神户的有限地点的钻孔获得的数据来估计液化地点。 1964年新泻地震、1983年日本海中部地震和1995年兵库县南部地震分别发生液化的地区并以金泽市为例，通过震后流量分析明确了管网的关键点，综合考虑确定了重要监测点。综合医院、避难所等震后重要基地较少。

项目成果

村田晶: "1995年兵庫県南部地震における地盤特性を考慮した上水道管路の被害要因分析" 土木学会第2回阪神・淡路大震災に関する学術講演会論文集. 1. 157-162 (1997)

Akira Murata：“1995 年兵库县南部地震期间考虑地面特征的供水管道损坏因素分析”第二届阪神淡路大地震学术会议论文集，日本土木工程学会 1. 157-162 (1997)。

村田 晶: "1994年三陸はるか沖地震における上水道管路被害の要因分析" 三陸はるか沖地震シンポジウム論文集. 109-116 (1998)

Akira Murata：“1994 年三陆遥冲地震中供水管道损坏的因素分析”三陆遥冲地震研讨会论文集 109-116（1998 年）。

Murata, A., Miyajima, M.and Kitaura, M.: "Damage Analysis of Water Supply Pipelines Considering Geological Characteristics in the 1995 Hyogoken-Nambu Earthquake (in Japanese)" Proc.of the 2nd Symposium on Hanshin-Awaji Great Earthquake Disaster. 157-162 (

Murata, A.、Miyajima, M.和 Kitaura, M.：“1995 年兵库县南部地震中考虑地质特征的供水管道损坏分析（日语）”第二届阪神淡路大地震研讨会论文集

Zhai, E., Miyajima, M.and Kitaura, M.: "Nonlinear Amplifications of Vertical Ground Motions in the 1995 Hyogoken Nambu Earthquake" Journal of Geotechnical Engineering, JSCE. No.582. 1-10 (1997)

Zhai, E.、Miyajima, M. 和 Kitaura, M.：“1995 年兵库县南部地震中垂直地面运动的非线性放大”岩土工程杂志，JSCE。

宮島 昌克: "強震記録を用いた液状化センサーの開発に関する基礎的研究" 土木学会中部支部平成9年度研究発表会講演概要集. 455-456 (1998)

Masakatsu Miyajima：“利用强运动记录开发液化传感器的基础研究”1997 年研究报告摘要，日本土木工程师学会中部分会 455-456 (1998)。