Effects of Mechanical Properties on Gas-Water Flow Characteristics around Boreholes: Implementation of Damage-Based Coupling Models.

At the extraction time of 10 days, the extraction rate decreases from 48 m 3 /d to 45 m 3 /d as the lateral pressure coefficient increases from 0.56 to 0.78. However, extraction rate shows a slightly increasing trend as lateral pressure coefficient continues to increase. 4.2.3 Effect of Internal Friction Angle During gas extraction, the internal friction angle is a significant parameter affecting the interaction between coal particles and, thus, coal damage.

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