Numerical Investigation of Influences of Drilling Arrangements on the Mechanical Behavior and Energy Evolution of Coal Models

<div>Failure modes of specimens with various drilling arrangements. (a) Different drilling diameters. (b) Different numbers of drilling holes in one row. (c) Different numbers of drilling rows.</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Numerical Investigation of Influences of Drilling Arrangements on the Mechanical Behavior and Energy Evolution of Coal Models 