Analysis and Measure of Housing Land Deformation Caused by Hyogo-ken Nanbu Earthquake

兵库县南部地震造成宅基地变形的分析与对策

基本信息

批准号：
08650577
负责人：
OKIMURA Takashi
金额：
$ 1.47万
依托单位：
Research Center for Urban and Security, Kobe 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-08650577/
关键词：
Hyogo-ken Nanbu Earthquake Housing Land Deformation Seismic Prospecting Shear Wave Velocity Seismic Response Analysis Response Acceleration Response Shear Strain 動的斜面安定解析反射法地震探査宅地変状盛土

项目摘要

Housing land was damaged at about 5,100 locations in the foot of the Rokko Mountain system due to Hyogo-ken Nanbu Earthquake appeared in 1995, and it was evaluated that 2,400 out of 5,100 locations require some measures for the safety reason. In this project, the cause of deformation-induced damage of housing land is investigated through a dynamic response analysis. Damaged and undamaged sites appeared in a housing land were first chosen. In the housing land, a boring exploration was performed after the quake to know the underground condition. Then, seismic prospecting was carried out with reflection method to grasp the near-surface ground structure, and to know the shear wave velocity for damaged and undamaged sites. As the results, two-layr system, surface layr and base rock, was defined as a near-surface ground structure, and fill was thicher in the damaged site than the undamaged one. The shear wave velocity was obtained as 130m/s for the damaged site and 140m/s for the undamaged site. A seismic response analysis was performed using the input data and boundary condition determined based on the seismic prospecting. In the project, "Super FLUSH" which is a program for two dimensional FEM was used as a seismic response analysis. The results obtained were ; 1) the response acceleration was not so different between damaged and undamaged locations ; and 2) the response shear strain for undamaged location is small in comparison with that for damaged locations. Then, it was deduced that larger shear strain could develop in the damaged locations and that, as a result, deformation-induced damage occurred.

1995年，由于Hyogo-ken Nanbu地震而在Rokko山系统脚下的约5,100个地点损坏了住房土地，并评估了5,100个地点中有2400个在安全原因中需要采取一些措施。在该项目中，通过动态响应分析研究了变形引起的住房土地损坏的原因。首先选择了住房土地上出现的受损和未损坏的地点。在住房土地上，地震后进行了无聊的探索，以了解地下状况。然后，使用反射方法进行地震勘探，以掌握近地面的地面结构，并了解受损和未损坏位点的剪切波速度。由于结果，两层型系统，表面层和基岩石被定义为近乎表面的地面结构，而在受损部位的填充物比未损坏的位置被填充。对于受损部位的剪切波速度为130m/s，未损坏的位点获得140m/s。使用基于地震勘探确定的输入数据和边界条件进行了地震反应分析。在项目中，“超级冲洗”是一个二维FEM的程序，用作地震反应分析。获得的结果是； 1）响应加速度在受损和未受损的位置之间没有太大差异； 2）与损坏的位置相比，未损坏位置的响应剪切应变很小。然后，推断出在受损的位置可能会出现较大的剪切应变，结果发生了变形引起的损伤。