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Effect of variation of the Coefficient of Friction on the Temperature at the Level of the Fault Lips

Open Journal of Earthquake Research 2022年第3期11卷 45-72页

作者： Francis Olivier Djiogang Fidèle Koumetio David Yemele Guy Pascal Konga Guillaume L. Ymeli Unit of Research of Mechanics and Modelling of Physical Systems Department of Physics Faculty of Science University of Dschang Dschang Cameroon

Earth’s crust is an anisotropic and purely heterogeneous medium, which is justified by existence of different discontinuities;our study aims to show the effect of the variation of coefficient of friction on the evolution of temperature and its impact on seismic forecasting. In this work, we are model in 2D the variation of thermal energy and temperature produced by friction at the level of fault lip as function of depth of the seismic focus and at different value of time. Earthquakes are born when the energy accumulated by friction at the level of fault is suddenly released causing damage, sometimes noticeable on the surface of earth (macroseisms), and sometimes not at all noticeable on the surface of earth (microseisms), then energy which occurs before is important to forecasting earthquake. Assuming that coefficient of friction is variable, our results have enabled us to highlight the fact that, the greater the coefficient of friction, more the temperature increases, although the temperature profile increase over time but not linearly reflecting the presence of different asperities and discontinuities zone;slip generated at the level of fault occur a variation of temperature on specific points called roughness in common agreement with the literature. A large part of energy produced by friction is dissipated in heat causing a local increases in temperature which a very short duration and called flash contact temperature, and that despite the fact that the temperature evolved in time and space, it all converged towards a perfectly distinguishable fixed point.

关键词： Earthquakes Coefficient of Friction Nucleation Phase Temperature variation energy variation Asperity Point

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Dynamic analysis of granite rockburst based on the PIV technique

Dynamic analysis of granite rockburst based on the PIV techn...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Wang Hongjian Liu Da'an Gong Weili Li Liyun Key Laboratory of Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences School of Mechanics and Civil Engineering China University of Mining & Technology

This paper describes the deep rockburst simulation system to reproduce the granite instantaneous rockburst *** on the PIV(Particle Image Velocimetry)technique,quantitative analysis of a rockburst,the images of tracer particle,displacement and strain fields can be obtained,and the debris trajectory *** to the observation of on-site tests,the dynamic rockburst is actually a gas-solid high speed flow process,which is caused by the interaction of rock fragments and surrounding *** the help of analysis on high speed video and PIV images,the granite rockburst failure process is composed of six stages of platey fragment spalling and debris ***,the elastic energy for these six stages has been calculated to study the energy *** results indicate that the rockburst process can be summarized as:an initiating stage,intensive developing stage and gradual decay *** research will be helpful for our further understanding of the rockburst mechanism.

关键词： Rock mechanics Instantaneous rockburst Particle image velocimetry energy variation

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