Mechanics of Fluid Saturated, Slip-Weakening Fault Zones

流体饱和、滑动减弱的断裂带的力学

• 批准号: 9526767
• 负责人: John Rudnicki
• 金额: $ 10.59万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-15 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526767&HistoricalAwards=false
• 关键词: Mechanics; Fluid; Saturated; Slip; Weakening

9526767 Rudnicki This research is a theoretical examination of the effects of coupling of shear deformation with pore fluid pressure changes on the stability of slip in fault gouge zones. Pore pressure alterations arise from shear-induced dilatancy or compaction and shear heating. The model incorporates idealizations of material behavior observed in laboratory experiments and estimated and measured in situ conditions. Numerical and asymptotic solution of the equations describing the model yield predictions of the evolution of fault slip and the temperature and pore pressure in the fault zone. The pressure and temperature changes predicted by the analysis provide a basis for the interpretation of hydrothermal mineralization and chemical alterations often observed in exhumed fault gouge zones. This research is a component of the National Earthquake Hazard Reduction Program. *** ??

9526767 Rudicki这项研究是对剪切变形与孔隙流体压力变化耦合对断层泥中滑动稳定性的影响的理论检验。孔压变化是由剪切引起的扩容或压实和剪切加热引起的。该模型结合了在实验室实验中观察到的材料行为的理想化以及在现场条件下的估计和测量。描述模型的方程的数值解和渐近解给出了断层滑动的演化以及断裂带内的温度和孔压的预测。通过分析预测的压力和温度变化为解释在折返断层泥带中经常观察到的热液成矿和化学蚀变提供了依据。这项研究是国家减少地震灾害计划的一部分。*？？