摘要
为控制引水隧洞爆破施工产生的负面效应,以犬木塘水库工程中的狮子岭隧洞爆破施工为背景,基于现场多方案爆破振动监测和ANSYS/LS-DYNA数值模型,研究了爆破振动在地表的传播特性,探讨了邻近建筑最大主应力与峰值合振速的相关性。研究结果表明:地表不同方向的振速分布存在差异,其中垂直隧洞轴线方向的振速衰减更为缓慢;三向振速中,水平向振速在低频带区段具有较高的能量分布;爆破荷载作用下,邻近建筑结构构件的交接处会出现应力集中,结构最大主应力和峰值合振速的相关性较好,依据综合数值模拟结果、实测振动主频及规范允许值,确定场地爆破振速安全阈值为2.0cm/s。研究结果可为类似近接既有建筑物爆破施工的安全防护提供参考。
In order to control the negative effects of blasting construction of water tunnel,based on the blasting construction of Shiziling tun-nel in Quanmutang Reservoir project as the background,based on the on-site multi-scheme blasting vibration monitoring and ANSYS/LS-DYNA numerical model,the surface propagation characteristics of blasting vibration were studied,and the correlation between the maximum principal stress of adjacent buildings and the peak resultant vibration velocity was discussed.The results show that there are differences in the distribution of vibration velocity in different directions,and the attenuation of vibration velocity in the direction of vertical tunnel axis is slower.In the three-direction vibration velocity,the horizontal vibration velocity has a higher energy distribution in the low frequency band.Under the action of blasting load,stress concentration will occur at the junction of adjacent building structural members,and the correlation between the maximum principal stress of the structure and the peak combined vibration velocity is good.Based on the numerical simulation results,the measured main frequency of vibration and the allowable value of the code,the safety threshold of site blasting vibration velocity is determined to be 2.0 cm/s.The research results can provide reference for the safety protection of similar adjacent existing buildings.
作者
罗亮明
韦凡秋
李颂章
伍福寿
张学民
张聪
周峰
LUO Liang-ming;WEI Fan-qiu;LI Song-zhang;WU Fu-shou;ZHANG Xue-ming;ZHANG Cong;ZHOU Feng(Hunan Water Resources&Hydropower Survey,Design,Planning and Research Co.,Ltd.,Changsha 410007,Hunan Province,China;School of Civil Engineering,Central South University,Changsha 410075,Hunan Province,China;School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,Hunan Province,China;Hunan Jianzhi Engineering Technology Co.,Ltd.,Changsha 410017,Hunan Province,China)
出处
《中国农村水利水电》
北大核心
2024年第9期109-114,共6页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51978671)
湖南省水利水电勘测设计规划研究总院有限公司科技开发项目(HKF202300665)。
关键词
引水隧洞
爆破振动
传播特性
数值模拟
diversion tunnel
blasting vibration
propagation characteristics
numerical simulation
作者简介
罗亮明(1979-),男,高级工程师,主要从事水利水电工程施工组织设计。E-mail:5798196@qq.com。
