摘要
文中介绍了单组结构面有机玻璃模型爆破实验的结果,提出了“似漏斗效应”的概念,进而就铅垂结构面对台阶垂直中深孔爆破最小抵抗线方向的影响进行了分析。
Discontinuities in rock mass, such as joint, cracks and bedding plane, is an important factor controlling result of borehole bench blasting practices. This paper gives the results of a series of modal scale, two borehole blasting tests and analyses the effect of geological discontinuities on direction of the minimum resistance of the rock mass to hole firing. When a discontinuity is located nearby the hole, a phenomenon of 'quasi-cratering effect' will occur:the fracturing degree within the medium between the hole and the discontinuity is most severe, while the medium beyond the discontinuity can hardly receive any damage. Further analyses shows the direction of the minimum resistance of rock mass with unidirectional discontinuities is theretically opposite to the composition of the vectors (1/ N_1) and (1/N_2) , which coincide with N_1 and N_2, the resistances from free face and the neighbouring discontinuity respectively. The direction of the minimum resistance to hole firing for rock mass with two sets of discontinuities, neglecting the effect of free face, will be normal to the longer diagonal of the parallelogram.
出处
《爆破器材》
CAS
北大核心
1993年第2期7-16,共10页
Explosive Materials
关键词
岩体
结构面
深孔爆破
爆破
rock mass constitution face
medium and long hole blasting
line of least resistance
quasi-cratering effect
