With the increasing trend of deep resource mining in China's alpine regions,the issue of suboptimal outcomes following charge blasting with various coupling medium frequently arises.To investigate the energy distribution of explosives in these alpine environments,and in alignment with the principles of precision blasting,this study first analyzed the explosion pressure transfer characteristics of different coupling media charges based on explosion dynamics theory.Subsequently,using LS-DYNA finite element software,a single-hole decoupling charge blasting funnel model for air,water,and ice was established.Secondly,based on the explosion damage cloud map,the volume of the blasting funnel for the uncoupled medium charge was determined.The attenuation characteristics of the explosion pressure and the energy absorption by the rock mass were subsequently analyzed.Finally,an optimization scheme was proposed based on the research findings and was implemented in on-site blasting operations.The results indicate that,under identical coupling coefficients,the initial pressure peak at the hole wall for water medium decoupling charge blasting increases by a factor of 1.14 to 2.60 compared to air decoupling charge blasting.Additionally,the radius of the blasting funnel crushing zone expands by a factor of 1.04 to 1.11,and the radius of the fracture zone enlarges by a factor of 1.19 to 1.48.For ice medium decoupling charge blasting,the radius of the blasting funnel crushing zone increases by a factor of 1.02 to 1.12,and the radius of the fracture zone expands by a factor of 1.15 to 1.48.The explosion pressure of uncoupled charge in air,water and ice media has an exponential relationship with the distance from the explosion center,when the coupling medium is water medium.
关键词
高原高寒/水耦合爆破/冰耦合爆破/数值模拟/能量分配/LS-DYNA
Key words
plateau high cold/water coupling blasting/ice coupled blasting/numerical simulation/energy distribution/LS-DYNA
维普
万方数据