The influence of rock joint characteristics on the effectiveness of liquid CO2 blasting
WANG Zhuoying
NAN Hua
WANG Shuai
Abstract：In order to study the influence of joint geometric characteristics on the effect of liquid CO2 blasting,based on the propagation characteristics of stress wave through liquid CO2 blas-ting,a incidence model of CO2 blasting stress wave was constructed under different joint geo-metric characteristics.Combined with LS-DYNA software and fractal dimension,the influence of joint length,width,inclination angle,curvature,and distance from the blast hole on the effect of liquid CO2 blasting was analyzed.The results show that joints have a significant bloc-king effect on the stress wave of liquid CO2 blasting,with a blocking coefficient generally be-tween 0.2 and 0.8.The degree of influence of the geometric characteristics of joints on the fluctuation of the blockage coefficient,from large to small,is as follows:joint spacing L,joint inclination angle θ,joint width d,joint curvature μ,joint length l.The rock damage caused by liquid CO2 blasting in jointed rock mass can be divided into two parts:fracture zone and blasting cracks.The fracture zone is mainly located between the blast hole and the joint,while the blasting cracks are mainly located around the blast hole and at the end of the joint.In addi-tion,by characterizing the damage of jointed rock mass through fractal dimension,it was found that the influence of joint geometric characteristics on the damage of liquid CO2 blasting rock masses,from large to small,is as follows:joint width d,joint length l,joint spacing L,joint inclination angle θ,joint curvature μ.A corresponding damage prediction model was es-tablished by combining regression analysis and linear fitting.The research results were experi-mentally verified in a gold mine in Song County,Luoyang,which effectively improved the blasting effect of jointed rock mass while reducing the construction amount,and promoted the promotion and application of liquid CO2 blasting technology.
Keywords：liquid CO2 blastingjointed rock massgeometric characteristicsblasting stress waverock mass damagefractal dimension
Publication Date：2025-09-30
Online Publishing Date：2025-10-31(First online date of this platform, not the publication date of the document)
Pages：16( 1096-1111 )