Research Article

A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention

Table 1

Mechanical parameters of coal in different states.

StateCohesion c (MPa)Internal friction angle φ (°)Slope of strength curve ξCompressive strength σc (MPa)

Pre-peak3.3222.29.78
Residual1.1313.123.89
After fracturing2.2181.896.06