软土地基支撑机械拆除及临近建筑动力响应研究
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摘要
以上海市某大型基坑内支撑机械拆除为例,在大量振动监测的基础上,研究了基坑内支撑机械拆除过程中产生的振动在基坑内部和基坑边缘挡土墙、高层建筑物竖直方向上的传播规律,监测同时考虑了临近建筑对机械振动的动力响应。研究表明:机械拆除基坑内支撑对周围建筑物所产生的振动速度较小,不足以影响构筑物结构安全,但由于振动信号的主频较低,接近于建筑物的固有频率,地震效应仍应该引起足够重视;利用小波包技术可得到振动信号各频带上的能量分布,从能量角度研究振动信号可以直观地了解信号在传播过程中的衰减特性。
Taking the mechanical demolition of foundation pit supporting in Shanghai as an example,a research was carried out on the propagation law of vibration caused by mechanical demolition of foundation pit support at different places,such as the inner of foundation pit,edge of foundation pit,different heights of the same building,based on a great number of vibration monitoring.During the monitoring,dynamic response of buildings around the foundation pit is taken into consideration simultaneously.Results show that the vertical vibration velocity of the constructions around caused by the mechanical demolition is very small and the velocity was not high enough to damage the constructions around.However,as the dominant frequency of vibration signal is low and closed to the natural frequency of buildings,the influence of vibration should be taken into consideration.The energy distribution at different frequency bands of the vibration signals with wavelet packet technique(WPT) and the propagation law of vibration could be directly achieved with energy analysis method.
Taking the mechanical demolition of foundation pit supporting in Shanghai as an example,a research was carried out on the propagation law of vibration caused by mechanical demolition of foundation pit support at different places,such as the inner of foundation pit,edge of foundation pit,different heights of the same building,based on a great number of vibration monitoring.During the monitoring,dynamic response of buildings around the foundation pit is taken into consideration simultaneously.Results show that the vertical vibration velocity of the constructions around caused by the mechanical demolition is very small and the velocity was not high enough to damage the constructions around.However,as the dominant frequency of vibration signal is low and closed to the natural frequency of buildings,the influence of vibration should be taken into consideration.The energy distribution at different frequency bands of the vibration signals with wavelet packet technique(WPT) and the propagation law of vibration could be directly achieved with energy analysis method.
引文
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[2]付晓峰.绳锯无损切割技术在城市地铁深基坑混凝土支撑拆除中的应用[J].隧道/地下工程,2009,(9):115-118.(Fu Xiaofeng.The application of non-destructive rope saw cutting technology in the demolitionof deep foundation concrete support in urban metro[J].Railway Construction Technology,2009,(9):115-118.(in Chinese))
[3]李建波,陈健云,李静,等.软土浅埋地铁车站地震响应的多因素影响分析[J].地下空间与工程学报,2009,5(2):395-401.(Li Jianbo,Chen Jianyun,LiJing,et al.Multi-factor influencing analysis on the seis-mic responses of subway station[J].Chinese Journal ofUnderground Space and Engineering,2009,5(2):395-401.(in Chinese))
[4]阳生权,廖先葵,刘宝琛.爆破地震安全判据的缺陷与改进[J].爆炸与冲击,2001,21(3):223-228.(Yang Shengquan,Liao Xiankui,Liu Baochen.Defaultof the judging standard of blasting vibration safety ab-stract[J].Explosion and Shock Waves,2001,21(3):223-228.(in Chinese))
[5]阳生权,刘宝琛.控爆中配电站等安全问题的处理[J].工程爆破,2000,6(3):89-92.(Yang Shengquan,Liu Baochen.Treatment of safety problems about distri-bution station in controlled blasting[J].EngineeringBlasting,2000,6(3),89-92.(in Chinese))
[6]中国生,房营光,徐国元.基于小波变换的建(构)筑物爆破振动效应评估研究[J].振动与冲击,2008,27(8):121-124.(Zhong Guosheng,Fang Yingguang,XuGuoyuan.Study on blasting vibration effect assessmentof structure based on wavelet transform.[J].Journal ofVibration and Shock,2008,27(8),121-124.(in Chi-nese))
[7]Daubechies I.The wavelet transform,time-frequencylocalization and single analysis[J].IEEE Transactionson Information Theory,1990,36(5):961-1005.
[8]刘爱华,黎鸿,罗荣武.时空效应理论在软土深基坑施工中的应用[J].地下空间与工程学报,2010,6(3):571-576.(Liu Aihua,Li Hong,Luo Rongwu.Ap-plication of the space time effect theory in the soft soilfoundation construction[J].Chinese Journal of Under-ground Space and Engineering,2010,6(3):571-576.(in Chinese))
[9]段绍伟,曾垂军.水平荷载对深基坑开挖变形的影响[J].地下空间与工程学报,2007,3(2):316-324.(Duan Shaowei,Zeng Chuijun.Effect of horizontal sim-ple harmonic load on the excavation deformation of deepfoundation pits[J].Chinese Journal of UndergroundSpace and Engineering,2007,3(2):316-324.(in Chi-nese))
[10]胡昌华,张军波,夏军,等.基于MATLAB的系统分析与设计—小波分析[M].西安:西安电子科技大学出版社,2000.(Hu Changhua,Zhang Junbo,Xia Jun.Wavelet Transform Based On Design And Analysis ofMATLAB[M].Xi’an:Xidian University Press,2000.(in Chinese))
[11]凌同华,李夕兵.多段微差爆破振动信号频带能量分布特征的小波包分析[J].岩石力学与工程学报,2005,24(7):1 117-1 122.(Ling Tonghua,Li Xibing.Analysis of energy distributions of millisecond blast vi-bration signals using the wavelet packet method[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1 117-1 122.(in Chinese))
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