Permeability Variation and Fracture/Crack Effects in Concrete/Rocks based on Multi-laminate Model
Subject Areas : Analytical and Numerical Methods in Mechanical Design
1 - Department of Civil Engineering, QazvinBranch, Islamic Azad University Qazvin, Iran
Keywords: Fracture-matrix-interaction, crack opening, damage model, multi-laminate framework, conductivity coefficient,
Abstract :
The permeability matrix of rock is a physical/mechanical characteristic that closely relates to the microstructure of this heterogeneous geomaterial, and the orientation of micro-cracks led to some naturally existing micro-cracks. Upon the effects of loading/unloading and high-temperature development, micro-cracks appear in critical zones of rock media that can effectively change the conductivity against gas or other fluids. Finally, macro cracks are generated and increase the porosity of the rock matrix on the distribution and geometrical arrangement. Consequently, the permeability becomes higher and depends on the stress/strain level of the rock body during loading/unloading and the passing fluidity interaction process. The influence of stress level and high temperature on rock's gas and water permeability has been studied in the literature. Fractured rock formations show vastly different properties, such as adsorption, etc., concerning permeability and storage capacity, thus giving rise to mass exchange processes between fractures and the surrounding matrix. This interaction between fracture and matrix impacts the flow and transport processes in the fractured subsurface, which can be observed on each scale considered for investigation purposes. The influence of fracture-matrix interaction has to be scrutinized upon the planned tests conforming to the natural condition when dealing with safety investigations or remediation possibilities. This paper shows some of the effects of fracture-matrix interaction and its geometry on groundwater flow in a saturated fractured rock/concrete media and the parameters describing those processes concerning different scales. A damage model concept contains fracture network generation, mesh generation, and appropriate discretization techniques based on presumed sampling between planes and polygons. The influence of a polygon matrix of finite porosity on the effective hydraulic conductivity tensor of a fractured system is illustrated by an example. In this research, we focus on determining the gas and water permeability of rock commonly used in transportation works, including loose/low strength and high strength/dense rock/concrete in interaction with pre-peak stress and damage level in post-peak behavior of rocks.
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