任少峰,吴立波,王大龙,彭世刚,刘恺,陶明,徐源泉

• 1:贵州福麟矿业有限公司
• 2:中南大学资源与安全工程学院

摘要(Abstract)：

针对分段空场嗣后充填采矿法中扇形孔爆破易引发充填体损伤及采场边界超欠挖等问题，以新桥磷矿地下采场为背景，采用有限元软件LS-DYNA构建数值模型，系统开展不同工况下的扇形中深孔爆破计算分析。将采场实测爆破轮廓与数值模拟结果进行对比，分析了不同荷载施加方式对爆破损伤预测精度的影响。数值模拟中分别引入实测孔壁压力时程加载及基于炸药材料—JWL状态方程的加载方法，实测荷载时程更能准确表征爆破效应。在此基础上，以两帮距和起爆微差时间为主要变量，对一步骤回采、二步骤回采及特殊采场条件下的扇形孔爆破过程开展系统模拟分析，并分析了围岩损伤分布规律及爆破振动特性。结果显示:一步骤回采两帮距对围岩稳定性影响较小，而起爆微差时间是控制爆破块度的主导因素。当两帮距在0.3 m时，爆破损伤主要集中于落矿区内，既能实现岩体整体破碎，又可显著降低围岩损伤风险。二步骤回采充填体稳定性对孔底距高度敏感，当孔底距大于0.6 m时可显著降低破坏风险，逐孔起爆虽能改善块度，但会加剧充填体损伤。特殊采场中，两帮参数不宜采用对称设计，应通过优化布孔降低充填体受损概率。基于研究成果，提出了适用于新桥磷矿a层矿的扇形孔爆破参数优化方案，为充填采矿法中的爆破设计提供参考。

关键词(KeyWords)： 扇形孔爆破;数值模拟;参数优化;孔壁压力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(52274105)~~

作者(Author): 任少峰,吴立波,王大龙,彭世刚,刘恺,陶明,徐源泉

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