Re-examination of peak stress and scaled distance due to ground shock
Re-examination of peak stress and scaled distance due to ground shock
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DOI：
10.1016/j.ijimpeng.2006.10.009
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发表时间：
2007-09
影响因子：
5.1
通讯作者：
E. Leong;S. Anand;H. Cheong;C. H. Lim
中科院分区：
文献类型：
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作者：
E. Leong;S. Anand;H. Cheong;C. H. Lim
与爆炸瞬变过程有关的地面运动在两个方面很重要。首先，它们作为动压力脉冲的结果而发展，并且与土壤所遭受的应变整体相关。其次，地面运动使附近的结构，埋在地下或地上，受到可能的破坏性振动。因此，准确地评估地面冲击参数，特别是峰值应力，对于抗爆炸载荷的可靠设计至关重要。通过足尺试验或小尺寸试验并辅以数值分析，可以获得可靠的地震动参数。美国陆军工程兵团TM5 - 855 - 1手册被广泛用于地面冲击参数的估计。本文根据新加坡残积土中的小规模现场爆炸试验，检验了TM5 - 855 - 1峰值应力的估算。TM5 - 855 - 1地震预报方程在量纲上不一致，当需要单位转换时，变得很麻烦。为了克服这个问题，提出了无量纲参数。使用无量纲参数，可更好地理解TM5 - 855 - 1中的峰值压力比例距离图。
Ground motions associated with the passage of blast transients are important in two respects. Firstly, they develop as a result of the dynamic pressure pulse and are integrally related to the strains suffered by the soils. Secondly, ground motions subject nearby structures, buried or aboveground, to possible damaging vibrations. An accurate assessment of ground shock parameters, especially peak stresses, is thus essential for a reliable design against blast loading. Reliable ground shock parameters can be obtained from full-scale tests or small-scale tests complemented by numerical analyses. The US Army Corps of Engineers TM5-855-1 manual is widely used for estimates of ground shock parameters. This paper examines the TM5-855-1 estimation of the peak stresses in the light of small-scale field explosion tests in Singapore residual soils. The TM5-855-1 equations for ground shock predictions are not dimensionally consistent and become cumbersome when the need for units conversion arises. To overcome this problem, dimensionless parameters are proposed. A better understanding of the peak pressure–scaled distance plot in TM5-855-1 is provided using the dimensionless parameters.