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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures, Part Ⅰ. Ground motion characteristics
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Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures, Part Ⅰ. Ground motion characteristics

机译：地下爆炸诱发地表运动特征及其对地上结构影响的数值研究，第一部分。地面运动特征

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摘要

Current codes of practice in assessing the blast ground motion effect on structures are mainly based on the ground peak particle velocity (PPV) or PPV and the principal frequency (PF) of the ground motion. PPV and PF of ground motion from underground explosions are usually estimated by empirical formulae derived from field blast tests. Not many empirical formulae for PF, but many empirical formulae for PPV are available in the literature. They were obtained from recorded data either on ground surface or in the free field (inside the geological medium). Owing to the effect of surface reflection, blast motions on ground surface and in the free field are very different. But not many publications in the open literature discuss the differences of blast motions on ground surface and in the free field. Moreover, very few publications discuss the blast ground motion spatial variation characteristics. As ground motion directly affects structural responses, it is very important to study its characteristics in order to more reliably assess its effects on structures. In this paper, a validated numerical model is used to simulate stress wave at a granite site owing to explosion in an underground chamber. Using the simulated stress wave, the relations such as PPV and PF attenuation as well as spatial variation of motions on ground surface and in the free field are derived. Discussions on the differences of the characteristics of surface and free field motions are made. Results presented in this paper can be used in a more detailed assessment of ground motion effect on structures.
机译：当前评估爆炸对结构的地震动影响的实践准则主要是基于地震动峰值速度（PPV）或PPV以及地震动的主要频率（PF）。地下爆炸产生的地面运动的PPV和PF通常是根据野外爆炸试验得出的经验公式估算的。文献中没有很多关于PF的经验公式，但是有很多关于PPV的经验公式。它们是从地面或自由场（地质介质内部）的记录数据中获得的。由于表面反射的影响，爆炸在地面和自由场中的运动非常不同。但是，公开文献中没有多少出版物讨论爆炸作用在地面和自由领域的差异。而且，很少有出版物讨论爆炸地震动的空间变化特征。由于地面运动直接影响结构响应，因此研究其特性以更可靠地评估其对结构的影响非常重要。在本文中，使用了经过验证的数值模型来模拟地下室爆炸引起的花岗岩现场应力波。利用模拟的应力波，推导了PPV和PF衰减之间的关系，以及地表和自由场中运动的空间变化。讨论了表面运动和自由场运动的特性差异。本文介绍的结果可用于更详细地评估地震动对结构的影响。

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