Experimental Study on Damage and Gas Migration Characteristics of Gas-Bearing Coal with Different Pore Structures under Sorption-Sudden Unloading of Methane

<div>The schematic and operation steps of experimental system for sudden unloading of gas-bearing coal samples. (a) Schematic of the system principle: ① air-conducting tube, ② gas pressure detector, ③ solenoid valve, ④ strain gauge 1, and ⑤ strain gauge 2. (b) Apparatus system and its operation steps.</div>

Geofluids

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Figure 4: Experimental Study on Damage and Gas Migration Characteristics of Gas-Bearing Coal with Different Pore Structures under Sorption-Sudden Unloading of Methane 

Figure 4 | Experimental Study on Damage and Gas Migration Characteristics of Gas-Bearing Coal with Different Pore Structures under Sorption-Sudden Unloading of Methane 