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时间:2019-05-31
《深基坑附近房屋出现裂缝的施工监测分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第3期岩石力学与工程学报Vol.28No.32009年3月ChineseJournalofRockMechanicsandEngineeringMarch,2009深基坑附近房屋出现裂缝的施工监测分析1213覃卫民,逄铁铮,王浩,孔文涛(1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071;2.厦门路桥建设集团有限公司,福建厦门361026;3.武汉大学土木建筑工程学院,湖北武汉430072)#摘要:针对明挖隧道深基坑旁6房屋出现明显的墙体裂缝,结合施工设计开展相应的安全监测工作,监测内容主要有房屋裂缝、房屋沉降、土体深部位移、支护桩水平位移及爆
2、破振动等。根据对典型裂缝测点和房屋周边环境的跟踪监测成果,对裂缝成因进行分析,推断出施工动荷载是房屋裂缝出现较快扩展的主要因素,冲孔桩施工使房屋墙体力学性能弱化,爆破开挖施工造成墙体出现裂缝,连续几天爆破振速超过1.0cm/s时产生的已有裂缝将#持续扩展;而环境温差对裂缝宽度变化有一定的影响。将分析成果应用于后续施工中,对7房屋附近区域的爆破#作业提出严格的振速控制要求,使7房屋裂缝扩展速率得到很好的控制。关键词:桩基工程;深基坑;砌体结构;裂缝监测;爆破振动中图分类号:TU473文献标识码:A文章编号:1000–6915(2009)03–0533–08ANALYSISOFEXCAV
3、ATIONMONITORINGFORHOUSECRACKINGNEARBYDEEPPITFOUNDATION1213QINWeimin,PANGTiezheng,WANGHao,KONGWentao(1.StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan,Hubei430071,China;2.XiamenRoadandBridgeConstructionGroupCo.,Ltd.,Xiamen
4、,Fujian361026,China;3.SchoolofCivilandArchitecturalEngineering,WuhanUniversity,Wuhan,Hubei430072,China)Abstract:ObviouswallcracksappearonthehouseNo.6nearthedeeppitfoundationofopen-cuttunnel.Withthecharacteristicsofthecracksandconstructiondesign,safetymonitoringintheareaisconducted,whichincludeh
5、ousecracks,housesettlement,displacementsofdeepsoil,horizontaldisplacementsofpiles,blastingvibration,etc..Accordingtothenumericalsimulationandthemonitoringresultswithrapidcrackinginthreestages,thecausesofcrackingareanalysed,whichexcludethefactorssuchasunevensettlement,temperaturedifference,slope
6、instability,anchortension,etc..Theresultsshowthatdynamicloadisthemainfactorwhichcausestherapidexpansioncracks;andthemechanicalpropertiesofthewallareweakenedbypunchpileconstructionaswellascracksinducedbyblasting,andtheoriginalcrackswillexpandcontinuouslyifthevibrationvelocityofthewallisgreaterth
7、an1.0cm/sinseveraldays.Itisalsoshownthatthetemperaturedifferenceofenvironmenthaseffectonexpansionwidthofcrack.Basedontheaboveresults,strictcontrolmeasuresforvibrationvelocityareadoptedinblastingoperationnearthehouseNo.7,makingtheo
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