预裂光面爆破中预裂缝减震效果分析

Analysis of Shock Absorption Effect of Pre-split Cracks in Smooth Face Blasting

为探索预裂缝参数,文章以大理州宾川海稍水库扩建工程第三标段引水管道工程一号段管槽为例,应用LS-DYNA软件构建预裂缝爆破数值计算模型,分别对预裂缝深度、预裂缝长度、预裂缝内充水高度对减隔震效果的影响展开分析研究。结果表明,为取得较好的减隔震效果,应将预裂缝长度和深度控制在爆破孔深度的一定范围内;预裂缝内充水后的减隔震效果明显弱于无充水,在因工程原因必须充填水的情况下,应将预裂缝内充水高度控制在预裂缝深度的0.4倍以内。

In order to explore the parameters of pre-split cracks,taking the pipeline excavation of section 1 of the third section of the expansion project of Haishao Reservoir in Binchuan County,Dali Prefecture as an example,a numerical calculation model of pre-split crack blasting was constructed using LS-DYNA software.The study analyzes the effects of pre-split crack depth,length,and water filling height on the shock absorption effect.The results indicate that,to achieve better shock absorption effects,the length and depth of pre-split cracks should be controlled within a certain range of blast hole depth.The shock absorption effect after filling water into the pre-split cracks is significantly weaker than without filling.In cases where water filling is necessary due to engineering reasons,the water filling height in the pre-split cracks should be controlled within 0.4 times the depth of the pre-split cracks.