掏槽孔爆破作用下隧道掌子面应力传播与衰减规律研究
Study on Stress Propagation and Attenuation Law of Tunnel Cutting Holes Under Blasting Action
许文祥 1张浩 1马鑫炎1
作者信息
- 1. 北京科技大学土木与资源工程学院,北京 100083
- 折叠
摘要
为明晰掏槽孔爆破作用下隧道掌子面应力传播与衰减规律,借助爆破试验分析隧道掌子面在掏槽孔爆破作用下水平方向、竖向和斜向的振动速度变化规律,同时采用ANSYS/LS-DYNA模拟掏槽孔爆破作用下隧道围岩同一截面内应力传播特点.研究结果表明:隧道掌子面边缘测点振动速度大于距爆源近测点振动速度,最小爆源距测点振动速度大于中间位置测点振动速度;隧道掌子面的拱顶和拱肩位置振动速度较大,上部测点振动速度大于下部测点;隧道掌子面应力主要集中在水平方向和竖向,纵向应力较小,水平方向和竖向应力变化时刻主要集中在0～5 ms,水平方向应力传播范围更广;隧道掌子面炮孔下方测点应力大于同爆源距上方测点.相关结论可为类似隧道动力响应分析提供参考.
Abstract
In order to make clear the stress propagation and attenuation law of tunnel face under the action of cutting hole blasting,blasting tests were applied to analyze the horizontal,vertical and oblique vibration velocity.At the same time,ANSYS/LS-DYNA was used to simulate the internal stress propagation characteristics of the surrounding rock of the tunnel in the same section.The results show that the vibration velocity of the measurement point at the edge of the tunnel face is greater than that of the measurement point near the explosion source.The vibration velocity from the measurement point of the minimum explosion source is greater than the vibration velocity of the measure-ment point at the middle position;The vibration velocities of the vault and spandrel of the tunnel face are larger,and the upper measurement point is greater than the lower ones;The tunnel face stress is mainly concentrated in the horizontal and vertical directions,the oblique one is smaller.The stress change times in horizontal and vertical di-rections are mainly concentrated in 0～5 ms.The horizontal stress propagation range is wider;The stress of the measurement point below the blast hole of the tunnel face is greater than that above the same explosion source.The relevant conclusions can provide reference for the dynamic response analysis of similar tunnels.
关键词
隧道掌子面/掏槽孔/爆破/应力传播/衰减规律Key words
tunnel face/cutting holes/blasting/stress propagation/attenuation law引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据