The Formula of Calculating Charge for Blasting in Rock Mass by Dimensional Analysis
In the design of rock mass blasting engineering the specific charge is an important parameter for promoting blasting efficiency and meeting engineering demand. In practice the parameter changes in 0.3～0.8kg/m3 or more. In order to get the parameter engineers usually do small-scale test of crater blasting in site. In the paper a new dimensional table is given for finding di-menstonless variable. The failure mechanism is discussed about both crater blasting and loose blasting. It is suggested that specific charge is related to the strength of rock mass and the explosion energy and the shear strength and tensile strength of rock are introduced into formula for calculating charge in crater blasting and loose blasting respectively. Furthermore the strength of rock mass relates to the distribution of joints. A relationship between equivalent rock mass strength and the space of joints is given. By comparing with case history date a simple formula of calculating charge in crater and loose blasting in rock mass is given.
formula for calculating charge specific charge crater and loose blasting
LI Shihai XIAO Nan LIU Xiaoyu
Institute of Mechanics of Chinese Academy of Sciences, Beijing, China
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
39-46
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）