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Stress Waves in Soil under Impact Loading of Explosive Welding

Lu Zhixiong Pan Junzheng (Nanjing Agricultural University) Wang Yaohua (University of Science and Technology, PLA)  
A series of stress waves was successfully detected on explosive welding site, using piezoelectric crystal sensors pre positioned at different depth of soil anvil. Measured results show that the stress wave crest decreased exponentially with increasing soil anvil depth. Attenuation coefficients α of shock wave in clay and sand are 19 305 and 10 670 respectively. The decreasing speed was related to “over pressure” time and soil anvil characteristics. The pressure distribution in soil varied with the location of explosive point. The pressure at the center was higher than other parts with central explosive. The pressure at the initial explosive point with edge explosive was lower than that at end point. The relationship between stress wave velocity D and soil particle velocity u was found to be D =205 16+7 850 3 u for sandy soil anvil, and D =124 69+ 36.725 u for clay soil anvil.
【CateGory Index】: S220
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