浅谈支护参数对隧道围岩影响的模拟研究

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1、摘要随着我国交通建设的快速发展，新奥法在我国隧道建设中得到了迅速推广。但是，利用支护结构加固隧道，喷射混凝土、锚杆和钢拱架等支护手段对控制围岩力学条件、变形作用如何，支护措施的作用是否得到充分的发挥，这个问题无论是对于隧道的结构安全，还是社会和经济效益都有重要的影响。论文结合毛坝隧道工程，首先，对隧道新奥法原理、施工的特点、实际应用等方面进行了探讨。介绍了隧道施工监控量测的过程与方法，对信息反馈与预测预报、量测数据的处理与分析进行了研究。其次，运用FLAC3D分析软件建立弹塑性模型，对毛坝隧道围岩进行数值模拟，得出喷锚支护后围岩和支护作为统一整体在位移、应力随喷射混凝土、锚

2、杆密度、锚杆长度、及钢拱架的变化规律，以此评价围岩的整体稳定性，进而提出优化初期锚喷支护结构的建议，达到指导施工的目的。关键词：公路隧道；围岩稳定性锚；喷支护；塑性圈；FLAC3DAbstractAbstract:Withtherapiddevelopmentofnationaltrafficconstruction,NewAustrianTunnellingMethodhasbeenappliedtotheconstructionoftunnelinChinaquickly.However,thesemakeussuspectwhetherthesupportsystem

3、consistofshotcrete,blotandsteelgantrycanguarneetthestructurestablityofthetunnel.Atthesometime,whethertheroleofsupportingmeasurestobebroughtintofullplaythisproblemhasgreatimportanceforthesocialandeconomicbenefits.ConbinewithMaobatunnel,fistly,theprincipleofNATMtunnel,constructionfeatures,pr

4、acticalapplicationsandsoonwerediscussed.Introducedthemonitoringoftunnelconstructionprocessandmethodofmeasurement,informationfeedbackandprediction,measurementdataprocessingandanalysiswerestudied.Secondly,theelastic-plasticmodelisestablishedbyusingtheanalysissoftware.Theelastic-plasticmodelo

5、fMaobatunnelwallrockissettedupbythesoftwareofFLAC3D.Theresultsshowthatthevariationofthedisplacementandstressisobtainedaccompanyingthechangeofshotcrete,Anchordensity,BoltLengthandtheSteelGantrywhentherockandtimberingafterthespray-anchorareregardedasawhole.Throughtheabovediscussion,thesemake

6、ustoevaluatethestabilityofsurroundingrock.Atthesametime,theadviceofoptimizingtheinitialanchorshotcretingisproposedsoastoguidetheconstructionpurposes.KeyWords：vehiculartunnel;surroundingrockstability;shotcretebolting;plasticitysphere;FLAC3D目录摘要Abstract1绪论....................................

7、..........................................................................11.1问题提出..............................................................................................11.2隧道支护理论的研究现状...................................................................11