The Effect of Pore Pressure on the Mechanical Behavior of Coal with Burst Tendency at a Constant Effective Stress

The mechanical evolution of coal is evident when the pore pressure and surrounding stress alone influence it. However, response saturated under coupling effect confining needs further investigation. This study identifies behaviors burst tendency dry condition where simultaneously increase but keep constant difference by conducting a series triaxial compressions on high samples. results show that elastic modulus (E) strength (?peak) from 3.4 to 4.8 GPa 78.5 92.6 MPa, respectively, macro shear failure angle decreases 64.2° 56.5° increases 9 15 MPa. these parameters opposite law increases. Furthermore, E ?peak decrease 3.84 2.75 73.4 60.3 64.7° 72.4° simultaneously. coefficient ? proposed reveal at effective pressure. Mohr–Coulomb criterion, including ?, ameliorated for application in conditions. In addition, model was developed pore-rich layer macrocracks, which confirmed acoustic emission. research reveals behavior Improved criterion criteria provide new guidance vision analysis instability seams.