深埋防护工程静动耦合作用下安全层厚度计算理论与方法

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

摘要:

针对外军钻地武器列装现状，通过地冲击能量耦合系数给出了等效封闭爆炸当量的计算方法。通过引入地冲击能量因子，提出了以能量因子为统一判据的破坏分区评判标准。利用经典弹塑性力学理论得到了围岩自承能力及围岩压力计算公式，揭示了围岩自承能力的本质是围岩剪切强度，且塑性区的扩展有利于自承能力提高。结合地冲击能量因子和动载作用下围岩压力，给出了地应力与地冲击耦合作用下深埋防护工程最小安全层厚度计算方法。计算结果表明，高地应力增大了地冲击的破坏效应，破坏区范围要大于不考虑地应力的情况。

关键词:地下爆炸;地冲击效应;安全层厚度

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