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Experimental Study and Numerical Simulation Using Extended Finite Element Method (XFEM) Combined with Cohesive Zone Model (CZM), of Crack Growth Induced by Non-Explosive Expansive Material on Two Neighboring Circular Holes of A Gneiss Rock

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Document pages: 21 pages

Abstract: TheNon-explosive expansion material (NEEM) is a method more environmentallyfriendly than the harmful conventional rock fracturing techniques. However, itis slower and very costly. Thus, any means of economizing their use is verydesirable. This paper investigates the crack growth between two neighboringholes of a gneiss rock internally pressurized by NEEM mixed with water with theaim to evaluate the influence of holes spacing (center-to-center distance), onthe initiation and growth of cracks. Field experimental results reveal thatcrack starts earlier and grows faster with increasing ambient temperature. Butwhen the ambient temperature is above 28°C, the NEEM is “blown out” of theholes. At these ambient temperatures, the surrounding rocks are hot and cannotdissipate efficiently the heat generated by the hydration reaction. The bestfilling time was found to be in the evening when the daily hot temperature hasdrooped. The time to first crack increases as hole diameter decreases. The 3D numericalmodeling and simulation of crack growth between two neighboring holesinternally pressurized by NEEM using ABAQUS (XFEM CZM) software shows a good agreement with thetheoretical and experimental results.

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