隧道爆破开挖施工对古建筑振动速度的影响
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摘要
以南京古建筑鼓楼为研究对象,结合南京地铁四号线隧道施工方案,采用ANSYS通用有限元软件建立分析模型,模拟计算隧道爆破开挖施工引起的鼓楼振动情况,并用试验验证了数值分析方法的可行性和可靠性。分析结果表明:振动波在鼓楼城阙中传播以高频为主,在碑楼以低频为主;测点振动速度峰值随药量和进尺的增大而逐渐递增,随爆源距的增加而逐渐减小;高度放大效应让部分测点振动速度峰值随爆源距的增大出现增大现象;鼓楼爆破施工药量宜控制在60g以内,进尺宜采用0.5m,并采取微差爆破技术减小振动效应。
By taking the Drum Tower ancient buildings in Nanjing as the research object, with reference to the tunnel construction condition of Nanjing subway line No.4, the dimensional model was made by the finite element software ANSYS. The vibration velocity responses of the Drum Tower ancient buildings under the condition of blasting excavation in tunnel was simulated and the feasibility and reliability of the numerical analysis method were verified by experiments. the results show that the vibration wave propagate with high frequency mainly in palace, with low frequency in stele building; the peak vibration velocities of measuring points increase with the increase of period charges and excavation footage and decrease with the increase of explosive source; the amplification effect cause the peak vibration velocities of some measuring points to increase of explosive source distance. Blasting period charge should be controlled within 60 g, the excavation footage should be 0.5 m, and the millisecond blasting technology should be used to reduce vibration hazards.
By taking the Drum Tower ancient buildings in Nanjing as the research object, with reference to the tunnel construction condition of Nanjing subway line No.4, the dimensional model was made by the finite element software ANSYS. The vibration velocity responses of the Drum Tower ancient buildings under the condition of blasting excavation in tunnel was simulated and the feasibility and reliability of the numerical analysis method were verified by experiments. the results show that the vibration wave propagate with high frequency mainly in palace, with low frequency in stele building; the peak vibration velocities of measuring points increase with the increase of period charges and excavation footage and decrease with the increase of explosive source; the amplification effect cause the peak vibration velocities of some measuring points to increase of explosive source distance. Blasting period charge should be controlled within 60 g, the excavation footage should be 0.5 m, and the millisecond blasting technology should be used to reduce vibration hazards.
引文
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[2] 赵欣,何龙飞.大帽山隧道出口左侧导坑爆破地震波分段规律初步分析[J].建筑结构,2010,40(S1):149-151.
[3] 管晓明,傅洪贤,王梦恕.隧道近距下穿山坡楼房爆破振动测试研究[J].岩土力学,2014,35(7):1995-2003.
[4] 高文学,颜鹏程,李志星,等.浅埋隧道爆破开挖及其振动效应研究[J].岩石力学与工程学报,2011,30(S2):4153-4157.
[5] 陈士海,魏海霞,张安康,等.多维爆破地震动作用下框架结构动态响应有限元时程分析[J].振动与冲击,2010,29(9):134-137.
[6] 周铎.爆破振动对古建筑物的影响以及古建筑物的防震措施[D].包头:内蒙古科技大学,2010.
[7] 马辉.中国高台基木结构古建筑动力特性及地震反应研究[D].西安:西安建筑科技大学,2011.
[8] 曹孝君,张继春,吕和林.隧道掘进爆破引起地表震动的数值模拟与现场监测分析[J].中国公路学报,2007,20(2):87-91.
[9] 张玉成,杨光华,胡海英,等.爆破振动对建筑物影响数值计算模型及安全判据的研究[J].土木工程学报,2015,48(S2):22-29.
[10] 贾磊,解咏平,李慎奎.爆破振动对邻近隧道衬砌安全的数值模拟分析[J].振动与冲击,2015,34(11):173-177.
[11] 爆破安全规程:GB 6722—2014[S].北京:中国标准出版社,2014.