摘要
通过拉普拉斯变换和Stehfest数值反演方法 ,得到了内爆炸荷载作用下柱形空腔周围弹性岩体介质中的动应力场。研究了爆炸载荷动态卸载对介质中应力分布的影响 ,发现爆炸荷载卸载过程中柱形空腔周围径向应力会由压转拉 ,该径向拉应力导致了钻孔爆破中环向裂纹的形成。此外 。
Through Laplace transformation and Stehfest numerical inversion,the dynamic stress field in elastic rock medium around the cylindrical cavity under inner explosion load is calculated The influence of dynamic unloading of explosion load on stress distribution in rock medium is discussed,and it is found that during the unloading process of explosion load,the radial stresses around cylindrical cavity change from compressive stresses to tensile stresses which leads to the formation of circumferential cracks In addition,a reasonable explanation to some phenomena observed in blasting engineering is made using the mechanism of dynamic unloading
出处
《工程爆破》
2003年第3期7-11,6,共6页
Engineering Blasting
基金
教育部优秀青年教师资助项目 (2 0 81)
留学回国人员科研启动基金资助[教外司留 (2 0 0 2 ) 2 47]
关键词
钻孔爆破
环向裂纹
爆炸荷载
介质
应力
柱形空腔
动态卸载效应
Drilling-and-blasting
Circumferential cracks
Laplace transformation
Numerical inversion
Cylindrical cavity
Dynamic unloading
