摘要
为降低隧道楔形掏槽爆破振动强度,基于Mohr-Coulomb强度准则及最大拉应力理论与Anderson叠加原理,提出隧道楔形掏槽爆破精确延时技术。通过理论分析,揭示了楔形掏槽延时爆破机理,优化了掏槽孔起爆顺序;引入Gauss函数,对爆破振动波型进行拟合,得到了对应的函数表达式;结合Matlab软件对其进行不同延期时间的叠加计算,得到了降低爆破振动的精确延期时间。以国道109齐家庄隧道为背景工程,结果表明:楔形掏槽延时爆破,降低了单段起爆药量、改善了后爆孔爆破破岩条件并减弱了爆破振动传播能量;当延期时间为13 ms时,与常规掏槽爆破相比,振动强度降低约60%;理论分析与现场监测数据相对误差13.9%,验证了该技术的有效性。
To reduce the vibration intensity of wedge-shape excavation blasting in tunnel,the precisely controlled delay time technology of tunnel V-cut blasting was proposed based on the Mohr-Coulomb strength criterion,the maximum tensile stress,and Anderson superposition theory.Firstly,the mechanism of segmental blasting of V-cut is revealed through theoretical analysis.Secondly,the function of blasting vibration waves was obtained by fitting the Gauss function.Finally,the precise delay time of reducing blasting vibration was obtained by superimposing different delay times with Matlab.The results show that:The stepped V-cut blasting improves the free surface conditions of blasting,and weakens the vibration propagation energy by reducing the amount of blasting charge in a single stage.Based on the Qi Jiazhuang tunnel of National Highway 109,the vibration strength of V-cut blasting was reduced by about 60%when the delay time was 13 ms.The engineering practice showed that the relative error between the theory and the field monitoring data was 13.9%,which verified the validity of the technology.
作者
胡宇
汪艮忠
周珉
高文学
张小军
Hu Yu;Wang Genzhong;Zhou Min;Gao Wenxue;Zhang Xiaojun(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,P.R.China;Zhejiang Lihua Blasting Engineering Co.,Ltd.,Lishui,Zhejiang 323300,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第3期1050-1056,共7页
Chinese Journal of Underground Space and Engineering
基金
爆破工程湖北省重点实验室开放基金(BL2021-23)。
关键词
隧道掘进
楔形掏槽延时爆破
爆破成腔判据
叠加原理
tunnel engineering
V-cut blasting
blasting cavity criterion
superposition theory
