Characterization of Fault-slip Taking Place in a Fractured Fault Damage Zone
Characterization of Fault-slip Taking Place in a Fractured Fault Damage Zone
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破碎断层损伤带断层滑移特征
DOI：
10.1088/1755-1315/861/5/052038
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Asahina D
中科院分区：
文献类型：
--
作者：
Sainoki A;Iwata N;Asahina D
摘要在断层带人为地震活动的数值模拟方面做了大量的工作。然而，这种研究没有充分考虑断层破坏带内复杂的地质结构和应力状态。本研究旨在探讨近断层复杂应力状态对断层滑动强度的影响。为此，构造了一个包括断层核及其损伤区的三维数值模型，该模型采用相当于损伤区内裂缝弹性的各向异性柔度张量和界面单元来模拟沿岩心发生的断层滑动。分析结果表明，该模型产生的最大剪切位移为0.14m(MW=2.55)，而均匀各向同性模型产生的最大剪切位移仅为0.038 m(MW=2.03)，这表明断层破坏带产生的应力集中对断层的剪切行为有重要影响。这项研究强调了在估计诱发地震活动强度时考虑断层破坏带的复杂机制的重要性，并为更准确地预测诱发地震活动的震源参数的方法的发展提供了洞察。断层滑动是一种与各种工程项目相关的重要物理现象，它可以在深部引起显著的应力变化，从而重新激活先前存在的地质结构，如深部地下采矿、地热能开发、石油和天然气生产以及隧道施工。重要的是，断层滑动引起的地震波以及正在滑动的断层的无震变形可能会对地下洞口和/或地面设施造成毁灭性的破坏。这可能会构成危及生命的风险。此外，断层滑动引起的剪切位移会改变断层的水力性质，从而直接影响断裂带内流体和气体的流动，从而影响流体和天然气的产能及其可持续性。因此，准确估计断层滑动的震源参数，如位置、震级和动力学参数，对于实现地下资源的可持续开发，同时降低致命事故的风险至关重要。
AbstractSignificant efforts have been made in numerically simulating anthropogenic seismicity in fault zones. However, such studies do not adequately consider the complex geological structure and stress state within a fault damage zone. The present study aims at investigating the effect of the near-fault complex stress state on the intensity of fault-slip. To this end, a three-dimensional numerical model including a fault core and its damage zone is constructed with an anisotropic compliance tensor equivalent to the elasticity of fractures within the damage zone as well as interface elements to model fault-slip occurring along the core. The analysis result shows that the model yields a fault-slip with the maximum shear displacement as much as 0.14 m (Mw= 2.55), whilst the maximum shear displacement produced in a homogeneous, isotropic model is merely 0.038 m (Mw= 2.03), implying the significant influence of stress concentrations generated in the fault damage zone on the shear behaviour of the fault. This study emphasizes the importance of considering the complex mechanics of fault damage zone in estimating the intensity of induced seismicity and provides an insight into the development of methodologies to predict source parameters of induced seismicity more accurately.1. IntroductionFault-slip is an important physical phenomenon pertinent to various engineering projects that could induce significant stress change at great depths, thereby re-activating pre-existing geological structures, e.g., deep underground mining, geothermal energy development, oil and gas production, and tunnelling. Importantly, seismic waves arising from fault-slip as well as the aseismic deformation of the fault undergoing slip can inflict devastating damage to underground openings and/or surface facilities. This could pose a life-threatening risk. Furthermore, the shear displacement induced by fault-slip can change the hydraulic properties of the fault, thus exerting a direct influence on fluid and gas flow in the fault zone and thus affecting the productivity of fluid and gas and their sustainability. Hence, an accurate estimation of seismic source parameters of fault-slip, such as location, magnitude, and dynamic parameters, is crucial to accomplish the sustainable development of underground resources whilst mitigating the risk for fatal accidents.
结晶岩发震断层损伤带的非均质性；
影响因子：
3.1
作者：
G. Ostermeijer;T. Mitchell;F. Aben;M. T. Dorsey;John Browning;T. Rockwell;J. Fletcher;F. Ostermeijer
通讯作者：
F. Ostermeijer
Vale Inco 岩爆管理的地质力学策略
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Creighton Mine;F. Malek;P. Eng;M. Sc;Fidelis T. Suorineni;P. Vašák
通讯作者：
P. Vašák