向华仙,苗涛,郭骏飞,黄刚,陈姗姗,张峰,张建华

• 1:中能建绿色建材有限公司
• 2:易普力股份有限公司
• 3:武汉理工大学资源与环境工程学院

摘要(Abstract)：

软弱夹层易导致边坡预裂爆破出现超挖、欠挖及半孔率低等问题，明确其角度对爆破效果的影响对优化爆破参数至关重要。采用数值模拟方法，以ANSYS/LS-DYNA有限元程序为技术平台，系统探究多条软弱夹层角度对预裂爆破效果的作用机制。基于岩石、节理、空气及炸药的物理特性，分别选取四类材料模型：HJC混凝土模型模拟岩石，PK双线性随动硬化模型表征节理(软弱夹层),ALE模型代表空气，HEB模型描述炸药；引入无反射边界条件以消减边界应力波反射干扰，将研究参数化以量化分析。构建三维数值模型，含8个炮孔，底部与上部台阶高分别为200 cm、1200 cm,坡面角80°;划分网格时对炮孔及附近区域加密，全局网格长50 cm以平衡计算效率与精度。模拟工况包括完整边坡、含与炮孔成45°及90°夹角的多条软弱夹层边坡，通过监测点(模型中部、底部)追踪应力变化，分析应力波传播、预裂缝成缝过程及超挖特征。最终结果显示：软弱夹层会加剧应力集中，45°夹角时超挖更严重，预裂缝平整度差、半孔率低；90°夹角时超挖程度相对较轻。软弱夹层的阻隔与吸能作用随夹角增大而减弱，随数量增多而增强。研究为含软弱夹层边坡的预裂爆破参数优化提供了量化依据。

关键词(KeyWords)： 软弱夹层;预裂爆破;数值模拟;裂缝扩展;边坡稳定性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(42271296)~~

作者(Author): 向华仙,苗涛,郭骏飞,黄刚,陈姗姗,张峰,张建华

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