基于根底控制的深孔台阶爆破超深优选方法An Ultra-deep Subdrilling Optimization Method for Deep-hole Bench Blasting based on Toe Rock Control
王洪刚,贾永胜,余浩天,罗鹏,黄炳林,周俊汝
摘要(Abstract):
在露天台阶爆破中,根底是衡量爆破效果的一个重要指标,其中爆破参数钻孔超深对根底的形成有着最为直接的影响。为探究深孔台阶爆破中钻孔超深对爆后台阶面平整度的影响,基于岩石损伤力学等基本理论,通过对工程中岩体损伤变量与波速间关系的统计分析,定义岩体发生损伤的临界损伤变量阈值D_d为0.2,临界破碎状态岩体的损伤阈值D_t为0.8。在综合考虑拉压损伤效应的岩石动力学损伤模型的基础上,利用LS-DYNA动力有限元软件,模拟不同钻孔超深条件下的台阶爆破损伤范围;基于岩体临界破碎状态的损伤变量阈值,绘制爆后台阶面的起伏分布图像,并利用图像进行量化分析,通过比较确定最优的钻孔超深,保证上台阶岩体充分破坏的同时,不影响下台阶面的施工。最后,结合鄂州机场土石方深孔台阶爆破的实际情况,验证了钻孔超深对爆破根底的影响机制,总结得到一种确定深孔台阶爆破最佳超深取值的优选方法,通过优化超深取值改善爆后新台阶面的平整度。
关键词(KeyWords): 台阶爆破;钻孔超深;爆破根底;临界损伤阈值;数值模拟
基金项目(Foundation): 国家自然科学基金项目(编号:51904210);; 江汉大学省部共建精细爆破国家重点实验室、江汉大学爆破工程湖北省重点实验室联合开放基金资助(编号:PBSKL2022D07);; 爆破工程湖北省重点实验室基金项目(编号:BL2021-11);; 湖北省重点研发计划项目(编号:2020BCA084)~~
作者(Author): 王洪刚,贾永胜,余浩天,罗鹏,黄炳林,周俊汝
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