不同掏槽孔角度下节理岩体隧道爆破效果研究
Study on Blasting Effect of Jointed Rock Mass Tunnels Under Different Slotted Hole Angles
卢剑1
作者信息
- 1. 中铁十七局集团第六工程有限公司 福建福州 350014
- 折叠
摘要
为探明节理岩体隧道中掏槽孔角度对掏槽爆破效果的影响,以节理裂隙发育严重的下寮隧道为工程依托,理论分析掏槽孔角度对掏槽爆破效果的影响,并列举选用掏槽孔角度常见的两种方法,最后结合数值模拟软件对掏槽孔角度分别为60°与70°的两种隧道模型进行数值仿真计算,量化分析两种模型的损伤面积与峰值有效应力,并基于结果选用合适的掏槽孔角度.结果表明:节理裂隙的存在会改变应力波的传播方向和能量分布,影响爆破效果;在Ⅴ级围岩中,70°的掏槽孔平均峰值有效应力是60°的1.36 倍,爆破损伤范围比60°大且分布连续,选用70°的掏槽孔有利于提高隧道掘进效率.
Abstract
In order to explore the influence of the angle of the slotted hole on the slotting blasting effect in the jointed rock mass tunnel,the influence of the slotting hole angle on the slotting blasting effect was theoretically analyzed based on the Xialiao Tunnel with serious joint fracture development,and two common methods were listed,and finally the two tunnel models with slotted hole angles of 60° and 70° were numerically simulated and calculated by combining numerical simulation software,and the damage area and peak effective stress of the two models were quantitatively analyzed.And the appropriate slotting hole angle is selected based on the results.The results show that the existence of joint fractures will change the propagation direction and energy distribution of stress waves,and affect the blasting effect.In the grade V surrounding rock,the average peak effective stress of the70° slotting hole is1.36 times that of 60°,and the blasting damage range is larger than that of 60° and the distribution is continuous,so the selection of 70° slotting hole is conducive to improving the tunneling efficiency.
关键词
节理岩体/隧道/掏槽孔/角度/爆破效果Key words
jointed rock mass/tunnel/slotted hole/angle/blasting effect引用本文复制引用
基金项目
中铁十七局集团有限公司科技研发项目(2023-A09)
出版年
2024
NETL
NSTL
万方数据