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ID:34300535
大小:3.39 MB
页数:85页
时间:2019-03-04
《地下洞室围岩压力分析及深圳地铁盾构法施工地数值模拟》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、攘要围岩压力是洞室经过开挖爱豹应力遂分布形成的应力,它楚遴行洞室支拶t设计对盛不爵少熬参数。嚣羹乏磷究它怒必要靛。本文运潮鸯疆元滚戆摹率蒙理,采用有限元分析软件ANSYS对备种洞室的围岩鹿力状态进行了数值模拟分析。并将其分橱结果与靓范规定及传统方法冉勺简化公式求得的结果作了比较,得出了一些套盏鹣结谂,同时掇毒在实筏中联罴注意豹闽越。本文系绕禽绍了藩葵戮岩嚣力懿各耪基本方法<包据规范方法、警氏理论、太沙基法、瓣梭理论等简化方法),荠燧糟这些方法对各耱漏室避行{卡葬。育黼元软件分析中,考虑了糟,
2、书的材料非线性
3、,网格划分对采用了四结点的等参元。考虑耋懿变形对,应趸了德整竞一酱挝话(Drueker-Prager)嚣黢溶粼。交鼹露,运用了牛顿一控酱森法进行迭代求解。文中,列举出了大量的算例,并对这些簿铆遗{亍了缡致躲有限元分耩,为实践中应用某魑篱纯公式提供了胃靠熬参考穰据,并鬻量爨各转蔼纯方法的逶蠲范潮,提出了~浆枣益熬建议。弱时,总缝了深溪瀚室、浅堙灞室及浚堙由壤处溺寰匿砉聪力躺分布趣豫,考痿了各静聪潦(如涮室形状、埋景潆度、粘聚力、摩擦角等)对围岩压力的影响。曩势,奉文还锌露嶷黼工稷(源霉
4、{减毒鞔遂交邋二羯l号
5、绞续建工程),避符了数德壤羧与赣究。蠡予该王程为双线淹遂王疆,葵瓣距不簿会麓蕊要塞,鞭魏运蠲蠢隈元法对其避努较为綮确麴力学分援,从嚣撬基此工鞭懿可行瞧以及在施工过程中的需要注意的问题。关键词;露鞭元法尉瓣蓬力材瓣《#线性邈下濑璧ABS譬RACTAftertunneling,therockmassstressisformed.Itisoneofthemos[importantparameterswhendesigningtunnels.ThenitisnecessaITtoresearchtherockmas
6、sstress。Theprincipleoffinite—elementmethodisusedtOanalyzemanykindsoftheundergroundopenings.AndsomenumericalsimulationswerecarriedOutwithANSYSprogram,The糟sul抟arecomparedwiththatcomingfromsimplifiedformulas.Someknowledgehasbeenachievedaccordingtothecalculate
7、dresultsofsomeexamples.Atthesametime,itispointedoutthatsomeproblemsshouldbeconsideredinpractice.Inthispaper,manybasicwaysofcalculatingrockmassstressareintroducedandtheresultsarefiguredoutinthelightoftheseways.Intheanalysisofthefinite·element,thematerialnon
8、linearityofrockisconsidered;isoperimetricelementoffour-nodeisusedinthecourseofmeshing.DruckermPragercriterionisappliedwhenplasticdeformationisconsidered.ThenNewton-Raphsonmethodisusedinsolvingprocess.Theealelotsofexamples,whichareanalyzedinfinite—elementwa
9、ys,andthentheyofferreferencevaluesforsimplifiedformulasandjudgetherangeofthebasicways.Atthemeantime,itisgeneralizedthathowtherockmassstressinshallowsubway,indeepsubwayandshallowhillslopedistribute。ItisalsoconsideredthatmanyNcmrs,suchastheshapeoftunnel,thed
10、epth,cohesivestren群handfrictionangle,Caninfluencethestress.Inaddition,theproject,tunnelsofShenzhensubwaysystem,isanalyzedandcalculatedbythewayof2DFEMnumericalsimulation.Duetotheillegaldistanceofthetwolines,th
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