漆涛,陶铁军,田兴朝,谢财进,万安桐,张厚英

• 1:贵州大学土木工程学院
• 2:贵州大学矿业学院
• 3:贵州大通路桥工程建设有限公司

摘要(Abstract)：

在大断面隧道爆破中，由于掏槽孔的位置布置不合理，导致掌子面中间岩体时常出现“鼓肚”现象。为解决大断面隧道爆破“鼓肚”现象，提出了一种“楔形掏槽+高能孔”的炮孔布设新方法。以云南省鲁巧高速共和村隧道为工程背景，采用有限元软件LS-DYNA建立“楔形掏槽+高能孔”的数值模型，研究了炮孔底部有效应力和岩体动态损伤，并与现场隧道掏槽爆破方案进行对比，同时结合现场爆破试验对所提新方法进行验证。研究结果表明：现场实验验证了“楔形掏槽+高能孔”炮孔布设方法可有效消除“鼓肚”现象，减少掏槽孔和数码电子雷管数量，确定了该方法的合理性以及适用性；主掏槽孔底部测点1、2和3产生的应力值较小，当高能孔爆炸后，应力急剧上升至454.9 MPa,可对主掏槽孔爆破后遗留的中间保留岩体进行有效破除；采用改进后的爆破方法，掘进效率提升16.9%,炮孔平均利用率达到91.5%,炸药单耗降低19.7%。提出的大断面隧道“楔形掏槽+高能孔”布设方法在保障施工安全的同时，达到了降低成本提高施工效率的效果，为大断面隧道爆破方案优化设计提供借鉴。

关键词(KeyWords)： 大断面隧道爆破;楔形掏槽;高能孔;“鼓肚”现象

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金地区科学基金项目（52064008）;; 贵州省科技计划项目（黔科合支撑[2023]一般358）~~

作者(Author): 漆涛,陶铁军,田兴朝,谢财进,万安桐,张厚英

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