Damage Characteristics of Surrounding Rock Subjected to VCR Mining Blasting
For limiting the damage range caused by explosive impact loads in vertical crater retreat (VCR) mining,the blasting damage characteristics of surrounding rock were studied by two methods-numerical simulation and ultrasonic testing.Combined with the mining blasting in Dongguashan Copper Mine,the VCR blasting characteristics under different conditions are obtained by using LSDYNA.Based on statistical fracture mechanics and damage mechanics theories,a damage constitutive model for rock mass subjected to blasting load was established.Then by using the fast Lagrange analysis codes FLAC3D,the blasting damage characteristics of surrounding rock were analyzed by applying the blasting loads obtained from the VCR mining and the damage zone is obtained.At last,the relationship between the amount of explosives and the radius of damaged surrounding rock mass was discussed,and its formula was also derived.The research provides a theoretical basis for rationally controlling stope boundaries and optimizing mining blasting parameters.
VCR blasting loads surrounding rock damage numerical simulation
JIANG Nan ZHOU Chuanbo LUO Xuedong LU Shiwei
Faulty of Engineering,China University of Geosciences,Wuhan,Hubei,China
国际会议
The 4th Asian-Pacific Symposium on Blasting Techniques(第四届亚洲太平洋地区爆破技术研讨会)
深圳
英文
68-74
2014-11-01（万方平台首次上网日期，不代表论文的发表时间）