Large-scale destress blasting for seismicity control in hard rock mines:A case study

作     者：Isaac Vennes Hani Mitri Damodara Reddy Chinnasane Mike Yao Isaac Vennes;Hani Mitri;Damodara Reddy Chinnasane;Mike Yao

作者机构：Department of Mining and Materials EngineeringMcGill UniversityMontrealQuebec H3A 0E8Canada Copper Cliff MineVale Canada LtdSudbury P0M 1N0Canada 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2020年第30卷第2期

页      面：141-149页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：This work is financially supported by a joint grant from MITACS Canada and Vale Canada Ltd the MEDA fellowship program of the McGill faculty of Engineering 

主　　题：Destress blasting Preconditioning Rockbursts Strainbursts Numerical modeling 

摘      要：Destress blasting is a rockburst control technique where highly stressed rock is blasted to reduce the local stress and stiffness of the rock,thereby reducing its burst *** technique is commonly practiced in deep hard rock mines in burst prone developments,as well as in sill or crown pillars which become burst-prone as the orebody is ***-scale destressing is a variant of destress blasting where panels are created parallel to the orebody strike with a longhole,fanning blast pattern from cross cut drifts situated in the host *** aim of panel destressing is to reduce the stress concentration in the ore blocks or pillars to be *** paper focuses on the large-scale destress blasting program conducted at Vale s Copper Cliff Mine(CCM)in Ontario,*** merits of panel destressing are examined through field measurements of mining induced stress changes in the *** destressing mechanism is simulated with a rock fragmentation factor(a)and stress reduction/dissipation factor(b).A 3D model is built and validated with measured induced stress *** is shown that the best correlation between the numerical model and field measurements is obtained when the combination of a and b indicates that the blast causes high fragmentation(a=0.05)and high stress release(b=0.95)in the destress *** is demonstrated that the burst proneness of the ore blocks in the panel stress shadow is reduced in terms of the brittle shear ratio(BSR)and the burst potential index(BPI).