Understanding Stress-strain Hysteresis in Porous Rocks During Hydrostatic Loading

What is it about?

This paper presents a micro-mechanical model to predict the stress–strain hysteresis during the cyclic hydrostatic loading of fluid-saturated rocks. The model considers a spherical pore surrounded by a multi-cracked shell, where local stress develops despite overall hydrostatic loading. It examines how cracks within the shell close and slip under different conditions, affecting the material’s properties. The model’s predictions are compared with experimental data, showing good agreement, especially for rocks with higher porosity.

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Photo by Bozhin Karaivanov on Unsplash

Photo by Bozhin Karaivanov on Unsplash

Why is it important?

Our findings have significant implications for energy exploration, reservoir monitoring, and geotechnical engineering. By accurately predicting the stress-strain behaviour of these rocks, the model aids in optimizing oil and gas extraction, improving the management of underground reservoirs, and ensuring the stability of underground structures. Additionally, it helps mitigate environmental risks associated with subsurface activities like hydraulic fracturing, making these processes safer and more efficient.