摘要
为了研究隧道施工对既有高压电塔的影响,本文结合宁波市小松山1号隧道施工对既有高压电塔影响的工程实例,初步拟定了4种电塔改造方案。文章运用有限元软件对各方案隧道施工中动力影响源(隧道爆破)进行安全距离敏感性分析和安全评估,以电塔安全振速为指标,判断各方案电塔是否安全,或对方案的爆破距离及炸药量提出要求。结果表明:隧道爆破对电塔基础的影响比上部电塔大的多;电塔基础振动速度与电塔基础外边缘至隧道中心的水平距离(安全距离)有关,安全距离越短振速越大,反之越小;此外,通过控制安全距离或削减炸药量,方案也可以满足隧道爆破对电塔基础安全振速的要求。通过隧道施工对既有电塔影响的实例研究,可为隧道爆破对既有高压电塔影响的相关工程提供参考。
To study the influence of tunnel construction on the existing high-voltage power transmission tower, this paper invesitages the influence of tunnel construction on an existing high-voltage power transmission tower in Xiaosong Mountain 1, Ningbo, and preliminarily considers four renovation schemes. The finite element software is used to carry out a safety distance sensitivity analysis and safety assessment of the powerful influence source(tunnel blasting) in each option of tunnel construction. The safe vibration speed of the high-voltage power transmission tower is used as an indicator to determine the safety of the high-voltage power transmission tower for each scheme and the requirements for the blasting distance and explosive quantity. The results show that tunnel blasting has much greater influence on the tower foundations than the upper towers. The vibration velocity of the tower foundations is related to the horizontal distance from the outer edge of the tower foundations to the centre of the tunnel(safety distance), and the shorter the safety distance the greater the vibration velocity and vice versa. In addition, by controlling the safety distance or reducing the number of explosives, the program can also meet the requirements of the safe vibration velocity of the tower foundations caused by tunnel blasting.The study of the effect of tunnel construction on existing high-voltage power transmission towers can provide a reference for the related works on the effect of tunnel blasting.
作者
林权威
LIN Quan-wei(Pingyang County Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Wenzhou 325401,Zhejiang,China)
出处
《地基处理》
2022年第1期48-57,共10页
Journal of Ground Improvement
关键词
山岭隧道
隧道施工
爆破振动
数值模拟
既有高压电塔
安全评估
mountain tunnel
tunnel construction
blasting vibration
numerical simulation
existing high-voltage power transmission tower
safety assessment
