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ID:32390695
大小:1.39 MB
页数:7页
时间:2019-02-04
《旋喷桩加固黄土隧道地基固结分析》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36卷第2期长安大学学报(自然科学版)Vol.36No.22016年3月JournalofChanganUniversity(NaturalScienceEdition)Mar.2016文章编号:16718879(2016)02007307旋喷桩加固黄土隧道地基固结分析赖金星1,樊浩博1,谢永利1,刘邦哲2(1.长安大学公路学院,陕西西安710064;2.西安建筑科技大学理学院,陕西西安710055)摘要:为分析高压旋喷桩加固黄土隧道工后长期变形,以西宁西过境高速大酉山黄土隧道地基加固段为依托,采用数值模拟结合现场实测的方法,对依托工程进行了固结分析。研
2、究结果表明:仰拱回填后30d内,隧道变形增长较快,在2000d达到稳定,数值模拟的隧底最大沉降为6.64mm,现场监测30d内沉降量占总沉降量的82.0%~92.2%,最大沉降为7.5mm;选取50m范围内的沉降变形进行横向比较,距离隧道中心约4倍洞径处沉降十分微小,在0~50m范围内,最大沉降差为5mm,未出现不均匀沉降现象,数值计算结果与现场实测结果吻合;黄土隧道地基加固效果明显,能够满足隧道长期稳定性的要求。研究结果可为采用固结分析方法研究黄土隧道长期变形问题提供借鉴。关键词:隧道工程;黄土隧道;工后沉降;固结分析;高压旋喷桩;长期变形中图分类号:U451文
3、献标志码:A犆狅狀狊狅犾犻犱犪狋犻狅狀犪狀犪犾狔狊犻狊狅犳犼犲狋犵狉狅狌狋犻狀犵狆犻犾犲狉犲犻狀犳狅狉犮犲犿犲狀狋犻狀犾狅犲狊狊狋狌狀狀犲犾1,FANHaobo1,XIEYongli1,LIUBangzhe2LAIJinxing(1.SchoolofHighway,ChanganUniversity,Xian710064,Shaanxi,China;2.SchoolofScience,XianUniversityofArchitectureandTechnology,Xian710055,Shaanxi,China)犃犫狊狋狉犪犮狋:Inorder
4、toanalyzethepostconstructiondeformationlawofloesstunnelwhichisreinforcedbyhighpressurejetgroutingpile,basedonthefoundationstrengtheningsectionofDayoushanTunneloftransithighwayinwestXining,thepostconstructionconsolidationsettlementwasanalyzedthroughnumericalsimulationandfieldmonitori
5、ng.Theresultsshowthatthetunneldeformationgrowsrapidlywithin30daysafterpavementcompleted,anditbecomesstableonthe2000thday.Thebiggestsettlementoftunnelbottomgainedfromnumericalsimulationis6.64mm,whilewithinthe30thdaypavement,settlementoccupiesabout82.0%92.2%ofthetotalsettlement,andthem
6、aximumsettlementis7.5mmaccordingtomonitoringresults.Thedeformationofsettlementwithin50misselectedtomakehorizontalcomparison.Itisverysmallatthepointoffourtimesofholediameterfromthecenteroftunnel,andthetunneldoesntappearunevensettlementasthemaximumdifferentialsettlementisonly5mmwithin
7、thescopesof50m.Thenumericalcalculatedresultsfitwellwiththemonitoringresults.Thereinforcementeffectonloesstunnelisobvious,andthelongtermstabilityoftunnelcanbesatisfied.Theresultscanprovideareferenceforanalysisofloesstunnellongtermdeformationbyusingconsolidationmethod.2tabs,10figs,25r
8、efs.收
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