Development of Liquefaction Detective Sensor Installing with Strong Ground Motion Accerelometer

强地震动加速度计液化检测传感器的研制

• 批准号: 11555122
• 负责人: MIYAJIMA Masakatsu
• 金额: $ 4.93万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555122/
• 关键词: Sensor for liquefaction detective; Real time management; Spatial distribution; Strong ground motion record; 液状化センサー; 強震記録; 強震計

The present study is focusing on the monitoring of ground motion in order to detect liquefaction. The importance of monitoring system was recognized in the lifeline earthquake engineering after the 1995 Hyogoken Nambu earthquake in Japan. The monitoring system in the lifeline earthquake engineering is classified into two aspects. One is the monitoring of lifeline facilities and the other is the monitoring of ground motion and ground failure. The present study is focusing on the monitoring of the ground motion in order to detect liquefaction.The study tries to use the strong ground motion records for detection of liquefaction. First, amplitude characteristics of strong ground motion records were investigated. Time histories of ratio of vertical ground acceleration to the horizontal one was calculated from response acceleration records at ground surface in liquefied and non-liquefied areas. If the ratio of vertical ground acceleration to the horizontal one is calculated at each time step, the ratio is remarkably great when the horizontal ground acceleration is close to zero instantaneously. Therefore, the ratio was calculated from the maximum accelerations for every 0.3 seconds in order to avoid the instantaneous great value. Next, frequency characteristics of the response acceleration records were studied. The average predominant frequency of the strong motion and decrease rate of the predominant frequency was calculated. Finally these indices were verified by using more than one hundred response acceleration records at ground surface including the 1999 Ji-Ji Earthquake in Taiwan and 2000 Tottoriken Seibu Earthquake.

本研究的重点是监测地面运动，以检测液化。1995年日本兵库县南部大地震后，人们认识到监测系统在生命线地震工程中的重要性。生命线地震工程的监测系统分为两个方面。一个是生命线设施的监测，另一个是地面运动和地面破坏的监测。本研究的重点是利用地震动监测来检测液化，尝试利用强震记录来检测液化。首先，研究了强震记录的幅值特性。根据液化区和非液化区地表的反应加速度记录，计算了竖向地面加速度与水平地面加速度之比的时程。如果计算每个时间步的垂直地面加速度与水平地面加速度的比值，则当水平地面加速度瞬时接近零时，该比值显着较大。因此，为了避免瞬时大值，根据每0.3秒的最大加速度计算比率。其次，研究了响应加速度记录的频率特性。计算了强震的平均卓越频率和卓越频率的下降率。最后，利用1999年台湾集集地震和2000年西武鸟取县地震等100多个地面反应加速度记录对这些指标进行了验证。

项目成果

Miyajima, M.and Kitaura, M.: "Detection of Liquefaction Using Response Acceleration Records at Ground Surface"Proc.of International Conference on Geotechnical and Geological Engineering. No.103(CD-ROM). (2000)

Miyajima, M. 和 Kitaura, M.：“利用地表响应加速度记录检测液化”岩土与地质工程国际会议论文集。

Takao HASHIMOTO: "Damage Characteristics of Buildings Close to Fault in the 1999 Ji-Ji Earthquake, Taiwan"Proc.of 6th International Conference on Seismic Zonation. (CD-ROM). No.29 (2000)

Takao HASHIMOTO：“1999 年台湾集集地震中靠近断层的建筑物的损坏特征”，第六届国际地震分区会议记录。

Miyajima, M., Nozu, S., Kitaura, M.and Yamamoto M.: "Study on Liquefaction Detective Method Using Strong Ground Motion Records"Journal of Structural Mechanics and Earthquake Engineering, JSCE(in Japanese). No.647. 405-414 (2000)

Miyajima, M.、Nozu, S.、Kitaura, M.和Yamamoto M.：“利用强地震动记录的液化探测方法研究”日本结构力学与地震工程学报（日文）。

Ikemoto, T., Takabatake, H., Kitaura, M.and Miyajima, M.: "An Evaluation of Dynamic Properties of Nonlinear System by Using Wavelet Transform"Journal of Structural Engineering(in Japanese). Vol.46A. 627-632 (2000)

Ikemoto, T.、Takabatake, H.、Kitaura, M. 和 Miyajima, M.：“利用小波变换评估非线性系统的动态特性”结构工程学报（日文）。

山本真樹: "強震記録を用いた液状化検知指標の提案とその検証"第25回地震工学研究発表会発表論文集. 1. 417-420 (1999)

山本真希：《利用强震动记录的液化探测指标的提出与验证》第25届地震工程研究会议论文集1. 417-420（1999）。