摘要
为研究隧道爆破施工对邻近桥梁的振动影响,运用FLAC3D建立数值模型,用瞬态动力学方法分析爆破振动对邻近桥梁桥面及桥桩的影响。分析结果表明,爆破对温州绕城高速公路下白岩桥桥面产生的振速最大值为1. 3 cm/s(左线)、1. 6 cm/s(右线);因承台的固定作用,爆破对桥桩中部和下部的影响相对较小(振速不超过0. 6 cm/s),均远小于安全设计振速2. 5 cm/s。
In order to research safety influence of tunnel blasting construction on adjacent existing bridge, this paper built a numerical model with FLAC3D, and the impact of blasting vibration on the deck and pile of adjacent bridges was analyzed by using transient dynamics method. The results show that under the action of blasting, the maximum vibration velocity on the bridge deck of Xiabaiyan Bridge on highway around Wenzhou is 1.3 cm/ s (in left line) and 1.6 cm/ s (in right line);because of the fixed function of pile caps, the impact of blasting on the middle and lower part of the pile is relatively small(the vibration velocity shall not exceed 0.6 cm/ s), which is far less than the safe vibration speed of 2.5 cm/ s.
作者
孟灵鑫
陈德云
Meng Lingxin;Chen Deyun(Wen Zhou XinDa Trasportation Engineering Testing CO. , LTD, Wenzhou 325000, China)
出处
《铁道勘察》
2019年第5期54-58,64,共5页
Railway Investigation and Surveying
关键词
隧道
爆破振动
施工
邻近桥梁
Tunnel
Blasting vibration
Construction
Adjacent bridge
