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1、浙江大學(xué)碩士學(xué)位論文軟土基坑土釘支護(hù)計(jì)算分析姓名:朱益申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):巖土工程指導(dǎo)教師:徐日慶;楊曉軍20050201浙江大學(xué)碩士學(xué)位論文軟土基坑土釘支護(hù)計(jì)算分析朱益2005年2月軟土基坑土釘支護(hù)計(jì)算分析摘要近年來(lái)土釘支護(hù)結(jié)構(gòu)得到了廣泛的應(yīng)用,不僅在北方等土層性質(zhì)較好的地區(qū),在沿海等軟土地區(qū)也得NT越來(lái)越多的應(yīng)用,但相關(guān)的理論研究目前均落后于工程實(shí)踐。本文鑒于軟土地區(qū)深基坑工程土釘支護(hù)結(jié)構(gòu)的研究及設(shè)計(jì)現(xiàn)狀在前人研究的基礎(chǔ)上,主要完成了以下幾個(gè)方面的工作:t.土釘墻結(jié)構(gòu)的有限元數(shù)值模擬(包括內(nèi)
2、力和位移),分析比較土釘/JnA-前后基坑的水平位移、沉降以及塑性區(qū)開(kāi)展的不同,這樣可以方便的顯示結(jié)構(gòu)在加載過(guò)程中的逐步破壞過(guò)程以及各階段結(jié)構(gòu)的應(yīng)力和位移狀態(tài)。通過(guò)有限元模擬,能夠更加合理地模擬結(jié)構(gòu)的支護(hù)作用,更真實(shí)地揭示出結(jié)構(gòu)的破壞機(jī)制。2.土釘支護(hù)各項(xiàng)參數(shù)對(duì)基坑的影響,包括土釘長(zhǎng)度、布置方式、傾角、面層厚度、粘聚力、內(nèi)摩擦角。3.分析了復(fù)合土釘?shù)闹ёo(hù)機(jī)理,并得到土體參數(shù)和樁體參數(shù)與復(fù)合土釘支護(hù)之間的關(guān)系,得出土體的彈性模量和泊松比對(duì)復(fù)合土釘支護(hù)有重要影響,另外攪拌樁的插入深度和寬度都有臨界值。4
3、.對(duì)基坑被動(dòng)區(qū)加固穩(wěn)定進(jìn)行一些研究,對(duì)被動(dòng)區(qū)不同加固的范圍進(jìn)行對(duì)比,比較分析加固深度和寬度對(duì)復(fù)合土釘結(jié)構(gòu)性狀的影響,加固區(qū)的合理寬度和深度分別為O.8--1倍和02~O.4倍開(kāi)挖深度。關(guān)鍵詞:軟土基坑:土釘支護(hù);有限元;參數(shù);復(fù)合土釘;加固N(yùn)umericalAnalysisoftheSoilNailedRetainingStructurefortheExcavationinSoftSoilAbstractRecently,thesollnailedretainingstructurehasbeenp
4、opularfortheexcavationnotonlyinthenorthernhard—seilbutinthecoastalsoftsoll.ttowever.thetheoriesaboutthesoilnailedretainingstructurearelaggingbehindtheengineeringpraetice.Inthisthesis,thestudies1istedbelowwerecarriedout.consideringcurrentresearchanddesi
5、gnstatusofthesoilnailedretainingstructure.1.Thelateraldisplacement,settlementandplasticaeraofexcavationwereanalyzednumericallywhenthesoilnailedretainingstructurewasappliedtotheexcavation.Bythenumericalsimulation,thefailureprocessofthestructurewasahowed
6、andthustheretainingeffectwasobtained.2.TheeffecttotheexcavationwithregardtovariousparametersofthesoilnailedretainingstructureWaSstudied,includingthenaillength,thepatternofarrangement,theslopeangle,ere3.Theretainingmechanismofcompositenaiisandtherelatio
7、nshiDbetweentheParametersofsoliandpileandthecompositenailsWaSanalyzedinthisthesis.Theanalysisshowsthatthemodulusofsoiia】矧PoissonratiogreatIyaffecttheSollNailedRetainingStructureandthatthedepthandwidthofmixed—in-placepilebothhavecritiealvalues4,Thestabi
8、】ityofthepassivesoilaroundtheexcavationwasstudiedwithre空ardtovariousimprovedaerabycompositenailS,suchastheirdepthandwidth.Thestudyshewsthattheappropriatewidthanddepthofimprovedareashouldbe0.8to1.0timeand0.2to0.4timeofthedepthofexcavatio