Development of numerical simulation method for prediction of surface earthquake fault behavior

地面地震断层行为预测数值模拟方法的发展

• 批准号: 12555125
• 负责人: HORI Muneo
• 金额: $ 8.32万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555125/
• 关键词: Active fault; Numerical simulation; Model experiment for faulting; Inverse analysis; 3D photoelasticity; Fault displacement; Crack propagation; Probability of faulting; ラドン変換; 応力分布推定

This research is aimed at developing a new numerical analysis method for prediction of fault behavior, based on model experiments which are to clarify the mechanism of rupture processes of faulting. New experiment techniques using CT scanner and 3D photoelasticity are developed ; the 3D photoelasticity uses new devices and data analysis method. It is shown in the model experiments that the governing mechanism of faulting is the bifurcation that leads to highly variable fault behaviors. Based on this observation, a new analysis method, called non-linear stochastic finite element method (NL-SSFEM) has been developed. This method analyzes the stochastic behavior of unconsolidated soil layers and find the most unstable bifurcated solution that corresponds to the actual faulting.The NL-SSFEM is tuned in applying geo-materials. The validity of the method is verified by reproducing several model experiments carried out by other researchers. For two-dimensional problem of normal or reverse faulting and for three-dimensional problem of lateral sliding, the NL-SSFEM is able to give fairly good evaluation of several parameters of fault configuration and loading. It should be emphasized the variability of these parameters is also well evaluated and that the NL-SSFEM is able to compute the probability of failure. Actual faulting is next studied. The targets are the Nojima Fault (coupled reverse and lateral faulting) and the Shirlongpong Fault (reverse faulting). Constructing a computer model for actual unconsolidated layers, the NL-SSFEM simulates the faulting, and the configuration of simulated faults is compared with observed ones. Good agreement supports the usefulness of the NL-SSFEM as a tool for predicting the fault behavior. The NL-SSFEM provides information about the faulting probability, as the amount of base movement that leads to the surface faulting. Although not verified, the values of the probability seems reasonable from the past data of faulting.

本研究旨在开发一种基于模型实验的预测断层行为的新数值分析方法，以阐明断层破裂过程的机制。开发了使用 CT 扫描仪和 3D 光弹性的新实验技术； 3D光弹性采用新的设备和数据分析方法。模型实验表明，断层的控制机制是导致断层行为高度变化的分岔。基于这一观察，开发了一种新的分析方法，称为非线性随机有限元法（NL-SSFEM）。该方法分析松散土层的随机行为，并找到与实际断层相对应的最不稳定的分叉解。NL-SSFEM 在应用岩土材料时进行了调整。通过重现其他研究人员进行的多个模型实验，验证了该方法的有效性。对于正断层或反向断层的二维问题以及横向滑动的三维问题，NL-SSFEM能够对断层配置和加载的多个参数给出相当好的评估。应该强调的是，这些参数的可变性也得到了很好的评估，并且 NL-SSFEM 能够计算故障概率。接下来研究实际断层。目标是野岛断层（反向和侧向断层耦合）和 Shirlongpong 断层（反向断层）。 NL-SSFEM 为实际松散层构建计算机模型，模拟断层，并将模拟断层的配置与观测到的断层配置进行比较。良好的一致性支持 NL-SSFEM 作为预测故障行为的工具的有用性。 NL-SSFEM 提供有关断层概率的信息，即导致表面断层的基础移动量。尽管未经验证，但从过去的断层数据来看，概率值似乎是合理的。

项目成果

M.Hori: "Application of spectral decomposition of Green's function to linear inverse problem"Engineering Analysis with Boundary Elements(special issue on Inverse Problem and Optimization). (2003)

M.Hori：“格林函数谱分解在线性反问题中的应用”边界元工程分析（反问题和优化特刊）。

M.Hori, Y.Yamashita: "Proposal of health monitoring system using ACROSS technology"Structural Eng./Earthquake Eng., JSCE. 17. 37-46 (2000)

M.Hori、Y.Yamashita：“使用 ACROSS 技术的健康监测系统的提案”结构工程/地震工程，JSCE。

M.Hori, M.S.Anders, T.Mizutani: "Analysis of periodic shear band formation : model experiments and numerical simulation"Bifurcation and Localization Theory in Geomechanics. 311-319 (2001)

M.Hori、M.S.Anders、T.Mizutani：“周期性剪切带形成分析：模型实验和数值模拟”地质力学中的分岔和定位理论。

M.Hori, T.Kameda T.Kato: "Prediction of stress filed in Japan using GPS network data"Earth, Planets Space. 52. 1101-1105 (2000)

M.Hori、T.Kameda T.Kato：“使用 GPS 网络数据预测日本的压力”地球、行星空间。

M.Hori and T.Kameda: "Identification of stress from strain for body with not fully identified constitutive relations"in Proceedings of Field Analyses for Determination of Material Parameters-Experimental and Numerical Aspects- . 11-12 (2000)

M.Hori 和 T.Kameda：“确定材料参数测定现场分析记录 - 实验和数值方面 - 中未完全识别本构关系的物体应变应力的识别”。