桥梁桩基冲孔桩施工的微振动响应研究
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摘要
运用微地震监测系统对桥梁桩基冲孔桩施工的微振动响应进行了研究与探索。通过在施工现场进行的微震试验,分组采集施工荷载作用下的波形数据,对试验的数据进行相关分析,研究冲孔桩施工引起的地表振动加速度和能量的衰减规律,分析冲击能和桩孔深度对振动速度的影响。试验结果表明:冲孔桩施工时,岩土介质中冲击振动能量随传播距离的增加呈乘幂关系衰减;随着桩孔深度的增加,同一水平距离的振动速度逐渐降低,其衰减幅度与桩孔一定深度的地质条件有关。
The vibration response of punched pile construction of bridge pile foundation is studied and discussed for the first time,by use of the micro-seismic monitoring system,which is internationally advanced.Through the micro-seismic monitoring experiment on the construction site,wave data of loads acting on the construction is collected in group.Then the waveform of testing data is analyzed.According to the results,the weakening rules of vibration acceleration and energy are studied,and the effect of impact energy and pile depth on the vibration velocity is analyzed.Experiment results reveal that impact energy attenuates exponentially with the distance from the explosive center.Moreover,the vibration velocity of the same horizontal distance gradually decreases with increase of pile depth,and the attenuation amplitude is related to the geological conditions.
The vibration response of punched pile construction of bridge pile foundation is studied and discussed for the first time,by use of the micro-seismic monitoring system,which is internationally advanced.Through the micro-seismic monitoring experiment on the construction site,wave data of loads acting on the construction is collected in group.Then the waveform of testing data is analyzed.According to the results,the weakening rules of vibration acceleration and energy are studied,and the effect of impact energy and pile depth on the vibration velocity is analyzed.Experiment results reveal that impact energy attenuates exponentially with the distance from the explosive center.Moreover,the vibration velocity of the same horizontal distance gradually decreases with increase of pile depth,and the attenuation amplitude is related to the geological conditions.
引文
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[2]宗琦,汪海波,周胜兵.爆破地震效应的监测和控制技术研究[J].岩石力学与工程学报,2008,27(5):938-945.ZONG Qi,WANG Hai-bo,ZHOU Sheng-bing.Research onmonitoring and controlling techniques considering effects of seismicshock[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(5):938-945.
[3]梁向前,谢明利,冯启,等.地下管线的爆破振动安全试验与监测[J].工程爆破,2009,15(4):66-68.LIANG Xiang-qian,XIE Ming-li,FENG Qi,et al.Safety tes-ting and monitoring of blasting vibration on underground pipeline[J].Engineering Blasting,2009,15(4):66-68.
[4]孙进忠,谭捍华,祁生文,等.强夯振动的频域分析[J].岩土工程学报,2000,22(4):412-415.SUN Jin-zhong,TAN Han-hua,QI Sheng-wen,et al.Fre-quency analysis of dynamic compaction vibration[J].ChineseJournal of Geotechnical Engineering,2000,22(4):412-415.
[5]刘国振,吕淑然,杨军.强夯振动效应研究[J].安全与环境学报,2003,3(6):14-17.LIUGuo-zhen,LVShu-ran,YANG Jun.Study on effect of vi-bration caused by heavy tampers[J].Journal of Safety and Envi-ronment,2003,3(6):14-17.
[6]施有志.强夯引起的振动规律及环境效应分析[J].岩土工程技术,2007,21(3):144-148.SHI You-zhi.Vibration produced by heavy tamping and its envi-ronmental effect[J].Geotrchnical Engineering Technique,2007,21(3):144-148.
[7]佘艳华,苏华友,肖正学.交通荷载作用下路面结构的微地震试验[J].中国公路学报,2009,22(6):40-46.SHE Yan-hua,SU Hua-you,XIAO Zheng-Xue.Micro-seis-mic experiment of pavement structure under traffic load[J].Chi-na Journal of Highway and Transport,2009,22(6):40-46.
[8]赵向东,陈波,姜福兴.微地震工程应用研究[J].岩石力学与工程学报,2002,21(增2):2609-2612.ZHAO Xiang-dong,CHEN Bo,JIANG Fu-xing.Study of mi-cro-seismic engineering applications[J].Chinese Journal of RockMechanics and Engineering,2002,21(suppl 2):2609-2612.
[9]成都环洲科技有限公司.HZ-MS48型微地震监测系统使用说明书[R].成都:成都环洲科技有限公司,2005:6-29.Chengdu Huanzhou Limited Company of Science and Technology.Using manual of HZ-MS48 Microseismic Monitoring System[R].Chengdu:Chengdu Huanzhou Limited Company of Science andTechnology,2005:6-29.
[10]高明仕,窦林名,张农,等.岩土介质中冲击振动波传播规律的微地震试验研究[J].岩石力学与工程学报,2007,26(7):1365-1371.GAO Ming-shi,DOULin-ming,ZHANG Nong,et al.Experi-mental study on earthquake tremor for transmitting lawof rockburstin geomaterials[J].Chinese Journal of Rock Mechanics and En-gineering,2007,26(7):1365-1371.
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