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《錨固系統(tǒng)應(yīng)力傳遞規(guī)律及內(nèi)錨固段設(shè)計方法研究》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、中南大學(xué)碩士學(xué)位論文錨固系統(tǒng)應(yīng)力傳遞規(guī)律及內(nèi)錨固段設(shè)計方法研究姓名:馮金健申請學(xué)位級別:碩士專業(yè):巖土工程指導(dǎo)教師:胡毅夫;鄧志斌200904碩士學(xué)位論文摘要為探索預(yù)應(yīng)力錨索荷載在坡面和內(nèi)錨固段的傳遞規(guī)律及其更加符合實際的錨固段長度設(shè)計計算方法,本文采用多種手段和方法,對預(yù)應(yīng)力錨索的力學(xué)傳遞過程進行了系統(tǒng)深入的分析和研究。主要研究內(nèi)容如下:1.基于彈性力學(xué)的空間半無限體理論,對單錨、群錨預(yù)應(yīng)力在坡面巖土體中的傳遞規(guī)律進行了研究,分析錨墩尺寸、預(yù)應(yīng)力大小、錨索間距等因素對應(yīng)力分布形態(tài)的影響,并采用FLAC3D數(shù)值分析軟件進行驗證。2.根據(jù)群錨應(yīng)力分布規(guī)律,闡明錨固應(yīng)力外墻的概念
2、,提出錨固應(yīng)力外墻有效厚度的計算公式,探討錨索間距及無應(yīng)力十字錐區(qū)的加固設(shè)計方法。3.研究內(nèi)錨固段界面剪應(yīng)力分布規(guī)律,分析不同荷載、錨固體直徑、巖體性質(zhì)等對應(yīng)力分布形態(tài)的影響;考慮界面破裂后錨索的極限抗拔力口4.對現(xiàn)行巖錨界面粘結(jié)強度的確定方法進行比較研究,考慮了孔壁粗糙度及高壓注漿對巖錨界面粘結(jié)強度的影響,提出相應(yīng)的修正公式。5.利用理論分析結(jié)果對傳統(tǒng)的基于錨固段剪應(yīng)力是均勻分布假設(shè)的錨索設(shè)計計算方法進行了修正,提出了一種關(guān)于錨索錨固段長度設(shè)計計算新方法。關(guān)鍵詞預(yù)應(yīng)力錨索,力學(xué)傳遞規(guī)律,錨固應(yīng)力外墻,剪應(yīng)力分布,巖錨界面粘結(jié)強度,錨固段長度,設(shè)計方法碩士學(xué)位論文ABSTRA
3、CTInordertoresearchintothelawoftheprestressedanchor’Sloadtransferringandthemethodaboutdesigningprestressedanchorwhichaccordingtothefact,severalmeanswereadoptedinthisthesistoanalyzeandstudythoroughly.111emainstudyworksareasfollowing:1.Thelawofloadtransferringonthesurfaceofrockmasswithsinglea
4、nchorandcompoundanchorswasresearchedbyusingthehalfspacetheoryoftheelasticity,andthepierdimensionofanchor,prestressedsize,anchorspacingandotherfactorsofinfluencesonstressdistributionpattemswereanalyzed.TheFLAC3Dwasusedtoverifythat.2.Theconceptofanchoredstress—dikewasclarifiedbasedonthestress
5、distributinglawofcompoundanchors,andtheeffectivethicknessformulaofanchoredstress—dikewasproposed.Thereinforcementdesignmethodofcablespacingandnon—stressedzonewasexplored.3.Theshearstressdistributionofprestressedcablesanchorwasstudied,andtheinfluencingfactorssuchasload,rockandsoilpropertyand
6、diameterofanchoragewereanalyzed.Theultimatepull-outforcewereconsideredinconditionthatinterfacewasfailed.4.Currentmethodstodetermineanchoragecohesivestrengthwerecompared.Theeffectsofhigh—pressuregroutingandroughnessofholesidewereconsideredandtheamendmentsontheformulawasproposed.5.Byusingthec
7、onclusionoftheoreticalanalysis.theorthodoxmethodofdesigninganchorropethatbasedonthehypothesisofshearingstrengthuniforlndistributingwasmodified,anewandmorereasonablemethodaboutdesigningthelengthofanchoringsectionwaspresented.KEYWORDS:Prestressedanchorrope