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时间:2019-02-25
《盾构隧道壁后注浆扩散模式及对管片地压力分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据第30卷第5期2009年5月文章编号l1000--7598(2009)05--1307--06岩土力学RockandSollMechanics、,01.30NO.5Mav2009盾构隧道壁后注浆扩散模式及对管片的压力分析叶飞1一,朱合华3,何川2(1,长安大学桥梁吲噬道陕西省重点实验室,西安710064:2.西南交通大学地FT程系,成都61003l;3同济大学岩十及地下工程教育部重点实验室,上海200092)摘要:在假定注浆浆液为牛顿流体,并在盾尾间隙影响厚度范围内均匀柱面扩散的前提下,通过引入等效
2、孔隙率替代土体本身的孔隙率来考虑建筑问隙的影响,对盾尾注浆和管片注浆2种情况下的浆液渗透范围及冈注浆而对管片造成的压力进行了理论推导,得到了浆液扩散半径及对管片产牛的压力计算式。结果表明,盾构隧道壁后注浆浆液的扩散半径及对管片产生的压力与注浆压力、注浆时问、土体特性及浆液性质等众多闪素有关,盾尾注浆对管片产生的注浆乐力小于管片注浆对管片产牛的压力。在假定其他参数已知的条件下,通过’‘具体实例,讨论了盾尾注浆时浆液扩散半径及注浆对管片产生的压力与注浆压力及注浆时间的火系。结果显示,虽然增人注浆压力、延长注浆时
3、间均能增人浆液的扩散半径及对管片产生的压力,但增长速度/1i尽相同。关键词:盾构;隧道;盾尾注浆:管片;管片注浆;注浆压力中图分类号:U45l文献标识码:ABack-filledgroutsdiffusionmodelanditspressuretosegmentsofshieldtunnelYEFeil一,ZHUHe.hua3,HEChuan2(1.ShaanxiProvincialMajorLaboratoryforHighwayBddge&Tunnel,Chang’anUniversity,Xi’al
4、l710064,China;2.DepartmentofUndergroundEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;3.KeyLab.ofGeotechnicalandUndergroundEngineefingofMinistryofEducation,TongjiUniversity,Shanghai200092,China)Abstract:Assumingthattheback-filledgroutsareNewto
5、nianfluids,andthegroutsdiffusewithcylindersurface,thegroutsdiffusionradiusandthepressuretoshieldtunnelsegmentsincaseofgroutingatthetailaswellasthroughsegments,arestudiedbysubstitutingtheintrinsicvoidpercentwiththeequivalentvoidpercentofthesoiltoconsiderthe
6、influenceofconstructiongap.Asaresult,theformulausedtocalculatetheradiusandthepressureareacquired.Itisshownthatthegroutsdiffusionradiusandthepressuretosegmentsarerelatedtomanyfactors,suchasthegroutingpressure,groutingtime,characteristicofthesurroundingsoila
7、ndthegrouts,etc.Itisalsoshownthatthepressuretothesegmentsproducedbygroutingatthetailislessthangroutingthroughsegments.Withotherparametersknown,therelationshipbetweenthegroutsdiffusionradius,pressuretosegments,andthegroutingpressure,groutingtimeisdiscussedb
8、yanengineeringexample,whichshowsthatboththediffusionradiusandthepressuretosegmentsincreasewiththeincreaseofthegroutingpressureandgroutingtime,buttheirspeedsaredifferent.Keywords:shield;tunnel;groutingatthetai
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