The Principle of Invariant Stress of the Surrounding Rock of the Hole under the Condition of Equal Pressure in the Deep Rock Mass

<div>Plastic area of the surrounding rock of hole in coal body and its influence range: (a) H = 100 m; (b) H = 500 m; (c) H = 1000 m; (d) H = 1500 m; (e) H = 1600 m.</div>

Shock and Vibration

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Figure 2

Figure 2: The Principle of Invariant Stress of the Surrounding Rock of the Hole under the Condition of Equal Pressure in the Deep Rock Mass 