基于无限元边界的输水隧洞爆破振动对周边高压输电铁塔的安全评估与优化  

Safety Assessment and Optimization of High-Voltage Transmission Towers Affected by Blasting Vibration of Adjacent Outlet Tunnel Based on Infinite Element Boundary

作　　者：赵勇 豆红强[2] 王鹏 孙永鑫 ZHAO Yong;DOU Hongqiang;WANG Peng;SUN Yongxin(State Grid Shandong Electric Power Company,Jinan 250001,China;Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,China;Economic and Technology Research Institute,State Grid Shandong Electric Power Company,Jinan 250000,China)

机构地区：[1]国网山东省电力公司,济南250001 [2]福州大学紫金地质与矿业学院,福州350108 [3]国网山东省电力公司经济技术研究院,济南250000

出　　处：《工业建筑》2023年第4期22-28,共7页Industrial Construction

基　　金：山东省自然科学青年基金项目(ZR2021QE259)。

摘　　要：以周边临近多条高压输电铁塔且采用钻爆法施工的某拟建输水隧洞为工程依托,建立了爆破动荷载下基于无限元边界的动力数值计算模型,借此研究了高压输电铁塔的动力响应特征与隧洞围岩振速的衰减规律,并结合相应规范对拟订爆破施工方案予以评估与优化。研究结果表明,无限元边界可较好地反映爆破能量向半无限介质传播的真实情况,避免其在计算域内往复震荡;在爆破荷载作用下,隧洞围岩合振速随距爆破中心点距离的增加大致呈指数级衰减。基于相应规范选取了以2.0 cm/s的峰值振动速度为安全判定标准,借此确定了三种拟订爆破施工方案的临界安全距离,进一步根据输水隧洞围岩工程特性与高压输电铁塔的相对位置关系,明确并优化了三种爆破施工方案在该输水隧洞中的分区施工范围。An outlet tunnel adjacent to multiple high-voltage towers will be constructed by borehole-blasting method.Based on this project a dynamic numerical calculation model with infinite element boundary under blasting dynamic load was established.The characteristics of the dynamic response for high-voltage transmission towers were studied,and the attenuation law of the surrounding rock vibration velocity was also discussed.Then the proposed construction schemes were evaluated and optimized in accordance with the corresponding specifications.The research results showed that the infinite element boundary could better reflect the actual situation of the blasting energy propagating to the semi-infinite medium and avoid oscillations in the computing domain.Under the action of the blasting load,the resultant vibration velocity of the surrounding rock decreased with the increase of the distance from the blasting center.Based on the corresponding specifications,a 2.0 cm/s peak vibration velocity was selected as the safety criterion,and the critical safety distances of the three proposed blasting construction schemes were determined.Furthermore,in consideration of the surrounding rock engineering characteristics of the outlet tunnel and the relative position of the high-voltage tower,the respective working area for the three blasting construction schemes was clarified and optimized.

关 键 词：高压输电铁塔 爆破振动 无限元 安全评估 优化设计 

分 类 号：TV554[水利工程—水利水电工程] TV542