Calculation Theory and Method of Safety Layer Thickness of Deep Underground Protection Engineering Under Coupling Effect of Static and Dynamic Loading

Abstract:

In view of the current situation of the foreign military ground-penetrating weapons， the calculation method of equivalent contained explosion equivalent is given through the coupling factor of ground shock energy. By introducing the dimensionless energy factor， a criterion of damage zones based on the energy factor is proposed. Based on the classical elastic-plastic mechanics， the formulas for calculating the self-supporting capacity of surrounding rock and the pressure of surrounding rock are obtained. It is revealed that the essence of the self-supporting capacity of surrounding rock is the shear strength of surrounding rock， and the expansion of the plastic zone is conducive to the improvement of self-supporting capacity. Combined with the energy factor and the surrounding rock pressure under dynamic load， the calculation method for the minimum thickness of the safety protective layer of deep buried protection engineering under the coupling effect of ground shock and in-situ stress is given. The results show that the high in-situ stress increases the damage effect of the ground shock， and the range of the damage area is larger than that without considering the in-situ stress.

Key words:underground explosion;ground shock effect;safety protective layer thickness