Safety Control and Practise of Blasting in the Site Preparation for Shaft Sinking in an Iron Mine
The blasting zone was very dose to many buildings. In order to control flying rocks, to improve Masting fragmentation and reduce wall damage, a ditch (or a narrow canal) of 8 m long was excavated from west to east at the center of the blasting zone. Then referring to the canal as the new free surface, there were two blasting work-faces driving to the south and north respectively. While one work-face was driven to the side slope in the north, wall-control blasting method was adopted to produce smooth slopes for the long term stability of the slope just north the future production shaft. On the south side, blasting continues until reaching a protection wall which was 2.5-meter-wide at bottom and a 4-meter-wide on top. This temporary protection was later demolished by loosening blast method and/or by mechanical rock breakers. For every bench, the same excavation sequence was followed until reaching the designed elevation for shaft sinking. In such process of blasting, shallow-hole benches were excavated by the making canals and then surface stripping from southern and northern faces. Towards the final walls of permanent slopes, smooth wall control blasting method was used to improve long term slope stability. During the blasting project, designed blasting parameters were strictly followed for the quality of work and good blasting results were obtained. There is a lot of reference value to similar projects.
smooth blasting bench blasting blasting safety ditch blasting surface preparation
JIA Hu ZHOU Guangyou
School of Civil Engineering and Architecture, Nanyang Normal University, Nanyang, Henan, China China · Ershisanye Construction Group Co. , Ltd, Changsha, Hunan, 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
175-177
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）