Study on the development of earthquake motion taking into account the stick-slip shear failure

考虑粘滑剪切破坏的地震运动发展研究

• 批准号: 07650547
• 负责人: MIURA Fusanori
• 金额: $ 1.28万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650547/
• 关键词: Pile foundation; Aseismic join; Ductility; Liquefaction; Lateral spreading; Response of pile; Large deformation analyzes; 固着すべり; 構成式

The purpose of this study is first to develop a nonlinear finite element method to simulate the results from experiments on stick-slip shear failure of rock masses and to investigate the near filed strong earthquake motions. We introduced the constitutive relationships obtained from the experiments into joint elements which we employed to model the fault of rock masses. Then, we performed parametric study to investigate the effect of parameters which control the constitutive relationships on the rupture propagation. By comparing the results obtained from the proposed numerical method and experiments, we found the validity of the proposed method.Second, we analyzed the fault model of which fault parameters were known by the proposed method. We investigated the relationship between stress drop and dislocation, and found that the magnitude of dislocation was more than twice of that of known value. This discrepancy seems to be due to the two dimensional modeling of three dimensional fault system. Next we investigated the relation between rupture velocities and the magnitude of shear strength, taup, minus initial stress, taui.. The rupture velocity depended on the magnitude of taup-taui. When the value of taup-taui was small, the rupture velocity was greater than the S-wave velocity, but less than the P-wave velocity.

本研究的目的是首先发展一个非线性有限单元法来模拟岩体粘滑剪切破坏的实验结果，并研究近场强震运动。我们将实验得到的本构关系引入节理单元中，用来模拟岩体的断层。然后，我们进行了参数研究，以调查的影响，控制本构关系的参数上的破裂扩展。通过将数值计算结果与实验结果进行对比，验证了该方法的有效性。其次，对已知故障参数的故障模型进行了分析。我们研究了应力降与位错的关系，发现位错的大小是已知值的两倍多。这种差异似乎是由于三维断层系统的二维建模。其次，我们研究了破裂速度和剪切强度的大小之间的关系，taup，减去初始应力，taui。破裂速度取决于τ-τ的大小。当τ up-τ ui值较小时，破裂速度大于横波速度，但小于纵波速度。

项目成果

坪井 利弘, 三浦 房紀: "断層運動を模擬する岩石滑り破壊実験の有限要素解析" 土木学会論文集. No537/I-35. 61-76 (1996)

Toshihiro Tsuboi、Fusunori Miura：“模拟断层运动的岩石滑动破裂实验的有限元分析”，日本土木工程师学会论文集 No537/I-35 (1996)。

T.TSUBOI and F.MIURA: "Simulation of fault rupture mechanism by nonlinear finite element method." Proceedings of the 1st Symposium on Urban Earthquake Disasters due to Directly Underneath Earthquakes. 53-58 (1997)

T.TSUBOI 和 F.MIURA：“非线性有限元法模拟断层破裂机制”。

三浦 房則, 坪井 利弘: "2次元非線形FEMによる断層破壊過程の検討" 土木学会.第52回年次学術講演会概要集. I(印刷中). (1997)

Fusunori Miura，Toshihiro Tsuboi：“使用二维非线性有限元法研究断层破裂过程”日本土木工程师学会第52届学术会议摘要集I（正在出版）。

F.MIURA and T.TSUBOI: "Study on the fault rupture process by using2-D nonlinear finite element method." Abstracts of the 52nd Annual Meeting of JSCE. (in printing). (1997)

F.MIURA 和 T.TSUBOI：“利用二维非线性有限元方法研究断层破裂过程”。

坪井利弘,三浦房紀: "断層運動を模擬する岩石滑り破壊実験の有限要素解析" 土木学会論文集. No537/I-35. 61-76 (1996)

Toshihiro Tsuboi、Fusunori Miura：“模拟断层运动的岩石滑动破裂实验的有限元分析”，日本土木工程师学会论文集 No537/I-35 (1996)。