摘要
为研究有限长柱形装药爆炸应力波的传播问题,首先进行了小装药量在模拟围岩介质自由场中的爆炸试验,所测得的应力时程曲线上先后出现两个应力峰值,依次对应纵波和横波,并且横波的应力峰值受柱形装药长径比变化的影响较大;在试验基础上采用椭球面波形式分析有限长柱形装药爆炸应力波的传播,椭球波阵面传播速度在沿r和φ两个方向衰减,随着波阵面的膨胀,沿φ方向传播速度逐渐趋于零,椭球波阵面逐渐过渡到球形波阵面;利用特征线法推得了椭球面波纵波和横波波速表达式,与爆炸试验中测得的应力时程曲线上出现纵波和横波两个峰值的试验现象相互印证。
In order to investigate the stress wave propagation problem of finite cylindrical charge explosion, a model explosion test was performed in a simulated wall rock free field. Two stress peaks at longitudinal and transverse waves occurred on the measured stress-time curve, and the stress peaks of shear wave were sensitive to the ratio of length to radius of cylindrical charge ; the stress wave propagation was studied in the form of ellipsoid based on the experiment result. It was shown that the propagation velocity of ellipsoidal wave front decayed along the directions r and φ and the ellipsoid wave front evolved to spherical as the wave front velocity of direction φ inclined to zero gradually. The velocity expressions of longitudinal wave and transverse wave were obtained by the method of characteristiclines and consistent with the phenomenon in explosion test where two stress peaks of longitudinal wave and transverse wave occurredon the stress time history curves.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第5期1030-1034,共5页
Chinese Journal of Underground Space and Engineering
基金
总后科研基金资助项目(080706)
关键词
柱形装药
椭球面波
应力波
爆炸
finite cylindrical charge
ellipsoid wave
stress wave
explosion
