Experimental Study on the Deformation and Permeability Characteristics of Raw Coal under the Coupling Effect of Confining Pressure and Pore Pressure

<div>Stress-strain-permeability changes of raw coal at different gas pressures. (a) Stress-strain-permeability changes of raw coal at different gas pressures (confining pressure unloaded to 4 MPa). (b) Stress-strain-permeability changes of raw coal at different gas pressures (confining pressure unloaded to 6 MPa). (c) Stress-strain-permeability changes of raw coal at different gas pressures (confining pressure unloaded to 8 MPa).</div>

Advances in Materials Science and Engineering

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Figure 5

Figure 5: Experimental Study on the Deformation and Permeability Characteristics of Raw Coal under the Coupling Effect of Confining Pressure and Pore Pressure 

Figure 5 | Experimental Study on the Deformation and Permeability Characteristics of Raw Coal under the Coupling Effect of Confining Pressure and Pore Pressure 