菱形楔形混合掏槽爆破的数值模拟研究与应用

发布时间：2018-04-30 11:01

本文选题：坚硬岩石 + 菱形楔形混合掏槽　；参考：《爆破》2016年04期

【摘要】：为了提高隧道在坚硬岩石条件下深孔爆破的掘进效率,首先提出了菱形楔形混合掏槽技术,计算了掏槽爆破技术参数;然后采用数值模拟研究了混合掏槽的爆破成腔过程及应力波的传播规律,实现了槽腔过程的可视化,并提取了关键部位的有效应力峰值;最后进行了现场应用试验。研究表明:该掏槽方式形成了多级多段掏槽,增加了爆炸应力波对坚硬岩体拉伸压缩破坏的次数,有利于破碎坚硬岩石;菱形掏槽炮孔侧面单元的有效应力峰值上下波动小,能量分布平均,能减弱炮孔过长引起的岩石夹制作用,形成稳定成型的槽腔;经测试,平均炮孔利用率达到了94%,验证了菱形楔形混合掏槽爆破参数的合理性。
[Abstract]:In order to improve the tunneling efficiency of deep hole blasting under the condition of hard rock, the rhombic wedge mixed cutting technology is put forward, and the technical parameters of cutting blasting are calculated. Then, numerical simulation is used to study the process of cavity formation and propagation of stress wave in mixed cutting blasting. The visualization of cavity process is realized, and the peak value of effective stress is extracted from the key position. Finally, the field application experiment is carried out. The results show that this cutting method forms multistage and multi-section cutting, which increases the number of tensile compression failure of hard rock by explosive stress wave, and is favorable to breaking hard rock, and the peak value of effective stress in the side unit of rhombic cut hole is small. The average energy distribution can attenuate the rock clamping caused by too long hole to form a stable forming groove cavity and the average hole utilization ratio reaches 94 by testing which verifies the rationality of the parameters of diamond wedge mixed cutting blasting.
【作者单位】：长沙理工大学土木与建筑学院;长沙理工大学桥梁工程湖南省高校重点实验室;新余学院建筑工程学院;
【基金】：国家自然科学基金项目(51278071;51308072) 湖南省研究生科研创新资助项目(CX2016B389) 长沙理工大学桥梁工程湖南省高校重点实验室开放基金资助项目(15KA03)
【分类号】：TD236

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