爆炸焊接冲击载荷下土壤应力测试  

Stress Waves in Soil under Impact Loading of Explosive Welding

作　　者：鲁植雄[1] 王耀华[2] 潘君拯[1] 

机构地区：[1]南京农业大学农业工程学院,南京市210032 [2]解放军理工大学工程兵工程学院,南京市210007

出　　处：《农业机械学报》2000年第2期22-26,共5页Transactions of the Chinese Society for Agricultural Machinery

摘　　要：在野外爆炸焊接现场 ,用压电式传感器测试了粘土和砂土两种地基的应力波波形。分析得出 :应力波峰值在粘土和砂土中的衰减系数α分别为 1 9.30 5和 1 0 .6 70 ;在同一水平面上压力的分布规律与起爆方式有关 ,中心起爆中间压力大 ,两边压力小 ,而边缘起爆起爆端压力小 ,尾部压力大 ,近似线性关系 ;粘土中应力波波速 D与质点速度 u的近似关系式为 D=1 2 4.6 9+36 .72 5 u,砂土中应力波波速 D与质点速度 u的近似关系式为 D=2 0 5 .1 6+7.85 0A 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.

关 键 词：爆炸焊接 应力波 土壤 压电式传感器 

分 类 号：O382.2[理学—流体力学]