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>Cloud pictures of roof stress of coal seam for the first time fracturing: (a) <i>t</i> = 200 s; (b) <i>t</i> = 800 s; (c) <i>t</i> = 1000 s; (d) <i>t</i> = 2000 s.</div>

Shock and Vibration

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Figure 7

Figure 7: 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 7 | 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 