Response Characteristics of Coal-Like Material Subjected to Repeated Hydraulic Fracturing: An Evaluation Based on Real-Time Monitoring of Water Injection Pressure and Roof Stress Distribution

<div>Comparisons of roof stress distributions of coal seam during each hydraulic fracturing: (a) t = 200 s; (b) t = 800 s; (c) t = 1000 s; (d) t = 2000 s (the abscissa in the figure represents the offset in the X direction from the fracturing hole, and the ordinate represents the offset in the Y direction from the fracturing hole, and the field value refers to stress level).</div>

Shock and Vibration

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Figure 8

Figure 8: Response Characteristics of Coal-Like Material Subjected to Repeated Hydraulic Fracturing: An Evaluation Based on Real-Time Monitoring of Water Injection Pressure and Roof Stress Distribution 

Figure 8 | Response Characteristics of Coal-Like Material Subjected to Repeated Hydraulic Fracturing: An Evaluation Based on Real-Time Monitoring of Water Injection Pressure and Roof Stress Distribution 