Abstract Ground vibration induced by subsurface detonations in geological media such as soil, termed as ground shock, has long been measured for decades, since the free field time history and peak intensity of the shock is the incident load to underground structures and important for design. To address the affected measurement accuracy due to acoustic impedance mismatch, a simple but effective approach is proposed: A sensor is embedded into a cellular solid casing before being installed in soil, whose acoustic impedance is designed to be the same as that of the surrounding soil to eliminate the reflection between the soil-casing interface while the relative motion between the sensor and casing is minimized. A field test and theoretical analysis are conducted to investigate the proposed approach, and it is found that the accuracy of ground shock measurement is improved.

中文翻译：

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用多孔固体精确测量地面冲击

摘要 在土壤等地质介质中由地下爆炸引起的地面振动，称为地面冲击，长期以来一直被测量，因为自由场时程和冲击的峰值强度是地下结构的入射载荷，对设计很重要。为了解决因声阻抗不匹配而影响测量精度的问题，提出了一种简单但有效的方法：将传感器嵌入蜂窝固体外壳中，然后安装到土壤中，其声阻抗设计为与周围土壤的声阻抗相同消除土壤-套管界面之间的反射，同时最大限度地减少传感器和套管之间的相对运动。进行了现场测试和理论分析以研究所提出的方法，