欢迎来到天天文库
浏览记录
ID:33336517
大小:2.10 MB
页数:9页
时间:2019-02-24
《城市隧道下穿密集建筑区静,动力响应特征分析①》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第12卷第2期铁道科学与工程学报Volume12Number22015年4月JournalofRailwayScienceandEngineeringApril2015城市隧道下穿密集建筑区静、动力响应特征分析①李铮,汪波,骆耀文,郭新新(西南交通大学交通隧道工程教育部重点实验室,四川成都610031)摘要:以莞惠城际隧道下穿密集建筑区段为依托,利用现场监测结果、室内模型试验以及动静结合的数值模拟方法,对城市隧道穿越不同结构类型、位置和高度的既有房屋时的综合影响进行研究。研究结果表明:房屋基础埋置较浅的浅埋隧道段,砌体结构房屋变形和振速均比框架结构大,随
2、着楼层高度增加,房屋水平位移的影响明显大于竖向位移,且低层结构更易发生受拉破坏,同时振速呈现出放大效应;隧道静力开挖时,位于掌子面前方的结构受力和位移均明显大于后方的房屋结构;随着爆心距增大,振速逐渐变小,但到达远端墙体时振速出现放大趋势,在确定监控方案时,需考虑对远方墙体的振动监控;爆心距离越小,其振速高度效应越明显,需重点监测顶层的振速;在上软下硬复合地层中,隧道开挖影响范围距掌子面约20m,偏离隧道中心线超过20m时,沉降速率增大,量值呈明显减小的趋势。关键词:既有建筑;动静结合;城市隧道;室内模型试验;现场试验段中图分类号:U455文献标志码:A
3、文章编号:1672-7029(2015)02-0384-09Analysisofstaticanddynamicresponsecharacteristicsofurbantunnelspassingunderneathdense-constructedareasLIZheng,WANGBo,LUOYaowen,GUOXinxin(KeyLaboratoryofTransportationTunnelEngineeringofMinistryofEducation,SouthwestJiaotongUniversity,Chengdu610031,Chi
4、na)Abstract:BasedonGuanhuiintercitytunnelpassingunderneathdense-constructedareas,thispaperusedthefieldmonitoringresults,laboratorymodeltests,dynamicandstaticcombiningnumericalsimulationmethod,toanalyzethecomprehensiveinfluenceswhenurbantunnelspassingexistingbuildingswithdifferent
5、structuraltypes,locationandheight.Theresearchshowsthatundertheshallowburiedtunnelsectionoftheshallowbuildingfoundation,thedeformationandvibrationvelocityofmasonrystructuresarelargerthanframestructures.Withtheincreaseoffloorheight,theinfluenceofhorizontaldisplacementissignificant
6、lygreaterthanverticaldisplacement,thetensiledamageoflowerstructuresismorelikelytooccur,andatthesametime,vibrationvelocitypresentstheamplificationeffect.Atthetimeofstatictunnelexcavation,thestressanddisplacementofstructureslocatedinfrontoftunnelfacearesignificantlygreaterthanth
7、osebehindthetunnelface.Whentheblastcenterdistanceincreases,thevibrationvelocitydecreasesgradually;however,whenitarrivesatthedistalwallthevibrationvelocityincreases.Consequently,whendeterminingthemonitoringplan,thevibrationmonitoringofdistantwallshouldbeconsidered.Thesmallerthebla
8、stcenterdistance,themoreobviouseffectofv
此文档下载收益归作者所有