- 1Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China (christine.yang@connect.polyu.hk)
- 2Department of Civil and Mineral Engineering, University of Toronto, Toronto, ON, Canada
- 3Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China
- 4Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen, China
Understanding the interaction of stress waves with fluid-filled rock joints is crucial for seismic hazard assessment, hydrocarbon extraction, geological CO2 storage, geothermal energy exploration, and wastewater disposal. This study investigates dynamic mechanical behaviors (including elastic modulus and initial joint stiffness) and wave propagation characteristics (i.e., transmission and reflection coefficients, energy attenuation) of single fluid-filled rock joints under the normal incidence of high-intensity stress waves, with a focus on the effects of liquid content and viscosity. Dynamic compression tests were conducted using the split Hopkinson pressure bar (SHPB) technique combined with high-speed photography on rock joints with varying liquid content and viscosity. The results demonstrate that higher liquid content and viscosity increase the dynamic elastic modulus and initial joint stiffness of the joints. Increasing joint stiffness leads to an increase in wave transmission but a decrease in wave reflection. Besides, the increasing liquid viscosity reduces both wave transmission and reflection but enhances wave attenuation by individual fluid-filled rock joints. High-speed imaging revealed a transition from turbulent to laminar jet behavior with increasing liquid viscosity. These findings advance the understanding of fluid-rock interaction under dynamic conditions, offering valuable insights for theoretical development and practical applications in geophysical and geomechanical engineering.
How to cite: Yang, H., Duan, H., and Zhu, J.: The role of fluid viscosity in the interaction between individual fluid-filled rock joints and high-intensity stress waves , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-15332, https://doi.org/10.5194/egusphere-egu25-15332, 2025.
