Re-examination of the shock wave's peak pressure attenuation in soils
Re-examination of the shock wave's peak pressure attenuation in soils
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DOI：
10.1016/j.ijimpeng.2011.05.011
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发表时间：
2011-11
影响因子：
5.1
通讯作者：
D. Yankelevsky;Y. Karinski;V. Feldgun
中科院分区：
文献类型：
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作者：
D. Yankelevsky;Y. Karinski;V. Feldgun
本文研究了装药在土壤中爆炸的问题，重点研究了冲击波的峰值压力衰减特性。对现有经验资料的分析发现，在某些类型的土壤中，衰减系数明显相似，而在其他类型的土壤中，衰减系数没有显著差异。研究还发现，现有幂律经验公式对激波峰值压力的预测与试验数据存在较大差异。即使在使用特定测试土壤参数的情况下，这种差异也是显著的。这些观察结果以及其他因素促使了这项研究。通过对不同土壤中激波传播的数值模拟，研究了幂律关系。将土体建模为一种体积不可逆的可压缩弹塑性介质，包括完全体积锁定和当前偏屈服应力与压力的依赖关系。采用拉格朗日方法和改进的变分差分方法对该过程进行了模拟。研究表明，对于某些类型的土壤，激波峰值压力衰减可以用指数恒定的幂律来表示，而其他类型的土壤在有限的距离范围内可以用幂律来表示，在较宽的距离范围内，它们的行为不能用对数尺度上的线性关系来描述，而是用双线性或三线性关系来很好地表示。这些发现解释了上面提到的一些观察结果。
The paper investigates the problem of a charge exploding in soil and focuses on the characteristics of the shock wave’s peak pressure attenuation. Analysis of existing empirical data observes different attenuation factors for apparently similar certain types of soils whereas for other types of soils there is no significant difference. It was also observed that prediction of the shock wave’s peak pressure with existing power law empirical formulas yields a large discrepancy in comparison to test data. The discrepancy is significant even in case where the specific tested soil parameters are used. These observations among others motivated this study. The power law relationship has been investigated through numerical simulations of the shock wave propagation in different soils. The soil is modeled as a bulk irreversible compressible elastic plastic medium, including full bulk locking and dependence of the current deviatoric yield stress on the pressure. The Lagrange approach and the modified variational difference methods are used to simulate the process. The study shows that the shock wave’s peak pressure attenuation for certain types of soils may be well presented by a power law with a constant exponent, whereas other types of soils may be presented by a power law for a limited distance range and their behavior for a wide distance range is poorly described by a linear relationship on a logarithmic scale but is well represented by a bi-linear or a tri-linear realtionship. These findings explain some of the above mentioned observations.