地雷埋藏深度对声波激发的地表振动影响的实验研究

Experimental study of the influence of the mine burial depth on the acoustically induced ground vibration

构建实验系统,研究地雷埋藏深度对声波激发的地表振动的影响。首先,简述声-地震耦合及其在地雷探测应用中的基本原理;其次,描述声波探雷实验系统及实验方案;最后,检测在没有埋藏物以及地雷埋藏深度在9 cm、11 cm和13 cm时声波激发的地表振动速度的幅频特性曲线。实验结果显示,有雷和无雷的地表振动速度比值的幅频特性曲线在120、210、420、450、550Hz存在明显大于1的极大值点,显示出土壤-地雷系统多模态共振的特征,而且共振强度随着埋藏深度的增加而减弱。

An experimental system is presented to investigate the influence of the mine burial depth on the acoustically induced ground vibration. Firstly, the mechanism of acoustic-to-seismic coupling is overviewed together with its appli- cation in buried mines detection. Then, the experimental system and scheme for acoustic mine detection are described. Finally, the amplitude-frequency characteristic curves of the ground vibration veiocity are pIotted for nothing buried and for mine buried at the depth of 9 cm, llcm and 13 cm respectively. The results indicate that the amplitude-frequency curves of the ratios of the ground vibration velocities with to without mine have maximal values greater than 1 at 120 Hz, 210 Hz, 420 Hz, 450 Hz and 550 Hz respectively, which reveal the characteristic of multi-modal resonance, however, the characteristic becomes weak as the mine burial depth increases.