Optimization of Indirect Fracturing Process Parameters Based on Mechanical Properties of Fractured and Low-Permeability Coal

Figure 6

Numerical simulation and experimental results. (a) Numerical simulation and experimental results of mode I fracture. (A) Size of a specimen or numerical model with mode I fracture. (B) Specimen and fracture pattern of test [2]. (C) Fracture pattern from numerical calculation. (D) Comparison of traction-separation curves obtained by two methods. (b) Numerical simulation and experimental results of mode II fracture. (A) Size of a specimen or numerical model with mode II fracture. (The left one is the top view, and the right one is the B-B section. (B) Specimen and fracture pattern of laboratory test [2]. (C) Numerical calculation model and fracture pattern. (D) Comparison of traction-separation curves obtained by two methods.

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