| 路基边坡逐孔微差爆破对邻近桥梁的影响 |
| |
| 引用本文： | 罗如登①,鲍志斌①,王正阳②.路基边坡逐孔微差爆破对邻近桥梁的影响[J].爆破器材,2022,51(5):59-64. |
| |
| 作者姓名： | 罗如登① 鲍志斌① 王正阳② |
| |
| 作者单位： | ①中南大学土木工程学院(湖南长沙,410000)②中交二航局建筑科技有限公司(湖北武汉，430000） |
| |
| 摘 要： | 为控制山区路基爆破对邻近既有桥梁的危害效应，基于ANSYS/LS-DYNA软件建立路基边坡-炸药-桥梁三维有限元模型，结合爆破振动实测数据，进行路基边坡爆破振动载荷作用下邻近既有桥梁的振动响应规律分析。通过控制变量法对比分析发现，逐孔起爆微差时间对邻近既有桥梁的爆破振动响应具有非单调性影响规律。研究表明:本工程案例中雷管逐孔起爆延期时间0- 5 ms区间内，可使邻近既有桥梁振速响应取到极小值；桥梁墩柱的振速响应与爆心距离成反比，但桥梁梁体中靠近墩柱处的振速响应则并非随着爆源距离的增加而递减，而是出现一定幅度的上升，爆破安全校核时应充分重视。
|
| 关 键 词： | 边坡 微差爆破 有限元 振动响应 |
Influence of Hole-by-Hole Millisecond Blasting of Subgrade Slope on Adjacent Bridges |
| |
| LUO Rudeng①,BAO Zhibin①,WANG Zhengyang②.Influence of Hole-by-Hole Millisecond Blasting of Subgrade Slope on Adjacent Bridges[J].Explosive Materials,2022,51(5):59-64. |
| |
| Authors: | LUO Rudeng① BAO Zhibin① WANG Zhengyang② |
| |
| Affiliation: | ①School of Civil Engineering, Central South University (Hu’nan Changsha, 410000)②Construction Technology Co., Ltd., China Communications 2nd Navigational Bureau (Hubei Wuhan, 430000) |
| |
| Abstract: | In order to control the harmful effect of subgrade blasting on adjacent existing bridges in mountainous areas, a 3D finite element model of subgrade slope-explosive-bridge was established based on ANSYS/LS-DYNA software. Combined with the measured blasting vibration data, the vibration response law of adjacent existing bridges under the blasting vibration load of subgrade slope was analyzed. Comparative analysis results of control variable method show that the millisecond time of hole-by-hole initiation has a non-monotonic effect on the blasting vibration response of adjacent existing bridges. Research results show that the vibration velocity response of adjacent existing bridges can be minimized within the delay time 0-5 ms of detonator hole-by-hole initiation in this engineering case. Vibration velocity response of bridge pier column is inversely proportional to the distance from the explosion center. But vibration velocity response near the pier column in the bridge beam increases to a certain extent with the increase of the distance from the explosion source. It should be paid full attention to when checking blasting safety. |
| |
| Keywords: | slope excavation millisecond blasting finite element vibration response |
|
| 点击此处可从《爆破器材》浏览原始摘要信息 |
|
点击此处可从《爆破器材》下载全文 |
