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

本研究旨在发展地震动与生命线设施之混合式监测系统，以早期侦测其地震破坏。首先，研究了地面破坏，特别是土壤液化的监测，因为液化是地震中最重要的岩土灾害之一。在这项研究中，强地面运动记录用于检测液化。研究了强地震动记录的幅值特性。根据液化区和非液化区的强地震动记录，计算了竖向加速度与水平加速度比值的时程。液化发生后，该比值增大，可作为液化检测指标之一。研究了强地震动记录的频率特性。液化和非液化条件下强地震动记录卓越频率的运行谱和时程 ...更多信息 d计算面积。在此基础上，提出了空间液化势的估算方法。该方法是一种地质统计学过程，称为克里格技术使用半变异函数。利用新泻、能代和科比市有限场地的钻孔数据，将该方法应用于液化场地的估算。对1964年新泻、1983年日本海中部和1995年兵库县南部地震的液化区域进行了预测，并以金泽市为例，探讨了生命线设施的最佳监测点。通过震后的流量分析，明确了管网的临界点，并结合综合医院、避难场所等震后的关键基础，确定了重点监测点。

项目成果

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）。

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)。

Yoshida, Masaho: "A Simplified Procedure to Estimate Liquefaction-Induced Large Ground Displacement Using Spatial Liquefaction Potential" Proc.of 7th ICOSSAR. (in press)

Yoshida, Masaho：“利用空间液化势估计液化引起的大地面位移的简化程序”第七届 ICOSSAR 论文集。

Yoshida, M., Miyajima, M.and Kitaura, M.: "Evaluation of Liquefied Ground Flow Based on Estimation of Spatial Liquefaction Potential" Proc.of 11WCEE. (CD). (1996)

Yoshida, M.、Miyajima, M. 和 Kitaura, M.：“基于空间液化潜力估计的液化地流评估”Proc.of 11WCEE。

宮島昌克: "リアルタイム地震防災のための強震記録を用いた液状化検知法" 第16回日本自然災害学会学術講演会講演概要集. 83-84 (1997)

宫岛正胜：“利用强震动记录进行实时地震防灾的液化检测方法”日本自然灾害学会第16届学术会议摘要83-84（1997）。