Discrete Element Simulation of Fracture Evolution around a Borehole for Gas Extraction in Coal Seams.

ACS Omega · 2022 · PMC9631414 · PMID 36340162

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an increasing trendno p-value reported

34 By comparing parts (a) and (b) in Figure 13 , it can be seen that when the drilling depth is less than half of the total length, the tangential force inside the model shows an increasing trend with the increase of drilling depth.

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