为分析非同源炸药包起爆后应力波叠加过程的破岩特性,以同时起爆相同球状药包为对象建立物理模型,根据所定义的破岩角β分析爆炸应力波叠加后的应力状态并构建斜交叠加的峰值应力变化函数,在此基础上利用LS-DYNA软件进行等效数值模型验证,对所建立的数值模型提取一系列监测单元,结果表明:依据应力函数得出了球状药包间爆炸应力波叠加时易产生破坏的应力交角β范围在arctan λ≤β<90°内(λ为侧压应力系数);通过观测不同监测单元对应爆炸应力峰值的变化趋势发现与所建立的理论峰值应力函数模型变化趋势基本吻合,证明所总结球状药包产生的爆炸应力波叠加过程破岩规律特性与理论规律效果相符合。研究成果可为采用球状药包的破岩工程提供理论参考和依据。
Abstract
A physical model of identical spherical charges that explode synchronously was built in this research to investigate the rock-breaking characteristics of stress wave superposition between explosive packages in different sources. According to the stress state after stress superposition between two spherical charges, the function of peak stress with oblique superposition is established. Furthermore, LS-DYNA software is employed to build an equivalent numerical model to verify the formulae obtained as aforementioned. The range of rock-breaking angle (β) where the rock can be easily destroyed is acquired as arctan λ≤β<90° (λ is the coefficient of lateral compressive stress). A sequence of peak points in stress superposition area was selected as unit points to obtain the curve of numerical stress change. The theoretical result of peak stress trend is consistent in general with the numerical result, implying that the rock-breaking characteristics in stress superposition process of spherical charges in the present research accord well with theoretical characteristics. The results offer theoretical reference and guidance for blasting project with spherical charges.
关键词
爆炸应力波 /
应力波叠加 /
破岩角 /
破岩特性 /
球状药包
Key words
blasting stress wave /
stress wave superposition /
rock breaking angles /
rock breaking characteristics /
spherical charge
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基金
国家自然科学基金项目(51566010);甘肃省自然科学基金项目(B061709)
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