PANORAMIC INSPECT AND EVALUATON ON BLAST EFFECTING OF INDUCTION CAVING IN HARD ROCK ROOF
Technology of induction caving roof is based on the successive mining, and it is said that the zone of fracturing is controlled through the pre-splitting blast and induce fracture was developed by the forced blast. With the development and expansion of the cracks, the rock mass would have been instability and caving in the roof. But, due to the process of the induction caving roof by the blast in the underground mine, the effects were invisible to the pre-sphtting blast and the force blast. It is difficult to evaluate the effect of blast. Using the borehole camera system, the technique of front view and digital panoramic were used to inspect the effect of blast. The shape of the hole was detected before blast, and the blast effect was inspected after the blast. Especially, after blasting, the cracks character is described by the digital panoramic borehole camera. The photographs were analyzed by the viewing them digitally. The results of the digital panoramic borehole camera show: (1) To pre-splitting blast, the pre-splitting cracks were formed after the blast. Its width is up to 20～40 mm, and the half wall of hole could be seen in the bottom of the hole. (2) Large amounts of secondary cracks were formed in the rock mass of the roof. The crack form is an X, and the original cracks were expanded. The mass shapes of blast was right, the rock stacked by the natural angle of slope. It is an advantage to induction caving roof to the large cracks and ruptured structural rock mass.
JIAN-HUA HU KE-PENG ZHOU XIAN-WEI LUO
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechan School of Resources and Safety Engineering, Central South University Changsha, 410083, P.R.China Tongkeng Mine, Liuzhou China Tin Group Company Ltd Liuzhou, 545000, PR.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
929-936
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）