摘要
在保护层开挖中,孔底空腔装药爆破的方法被证明对保护建基面是行之有效的。为了研究炮孔孔底空腔装药结构的爆炸作用机理,运用动光弹试验模拟介质受到爆炸载荷作用下的动态响应,分析了不同装药结构的孔底应力场分布情况及其作用规律;文中介绍了动光弹模型试验设计参数,通过对试验中条纹级数与比例距离曲线的对比分析,得出了合理的孔底空腔能有效地降低爆炸峰值压力和有利于保护建基面的结论。
The blasting method with charging structure of vacuum space at the blasting-hole bottom is applied to the bracer digging engineering. In order to explore the explosion mechanism of the charging method, the dynamic photo-elasticity equipment was applied to simulate the dynamic response of the medium when loaded by explosion. In the paper, the design parameter of the dynamic photo-elasticity test model was described. In the test, the stress diffusion was explored and recorded really-time. According to the data from the experimentation, the curves N-R(X/r) (stripe series to scale distance) corresponding to different vacuum space length were described and contrasted in the picture. The result from the test shows that the larger the vacuum space the less the peak pressure will be. Therefore, the method can adjust the blasting process availably, including reducing the peak value of pressure, prolonging the time of blasting action and reducing the destroying to the construction foundation.
出处
《实验力学》
CSCD
北大核心
2005年第4期623-627,共5页
Journal of Experimental Mechanics
关键词
中深孔爆破
孔底空腔
动光弹
应力场分布
mid-deep hole blasting
vacuum space blasting
dynamic photo-elasticity
stress distribution