資源描述:
《營口軟土地區(qū)樁網(wǎng)復(fù)合地基沉降規(guī)律研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫。
1、第35卷第5期世界科技研究與發(fā)展Vol.35No.52013年10月573-577頁WORLDSCITECHR&DOct.2013pp.573-577營口軟土地區(qū)樁網(wǎng)復(fù)合地基沉降規(guī)律研究劉浜葭張玲(遼寧工程技術(shù)大學(xué)建筑與工程學(xué)院,阜新123000)摘要:為研究濱海軟土地區(qū)高鐵地基的沉降問題,以哈大高鐵營口東站附近軟土地基處理工程為研究對(duì)象,對(duì)路基填筑過程和工后長期地基沉降進(jìn)行觀測。利用有限元數(shù)值分析軟件ADINA建立相應(yīng)的數(shù)值計(jì)算模型,研究了地基表面沉降規(guī)律。研究表明:地基沉降主要發(fā)生在路基填筑施
2、工期內(nèi),填筑期的沉降量占總沉降量的70%以上;路基填筑施工過程中,地基沉降曲線呈倒鐘形,刺入現(xiàn)象明顯,在CFG樁周沉降曲線呈“∩”形?;诂F(xiàn)場實(shí)測數(shù)據(jù),建立了工后長期地基沉降預(yù)測模型。對(duì)比分析結(jié)果表明,路基填筑完工三個(gè)月后(大約100d)預(yù)測公式精度較高,最終預(yù)測沉降量與觀測值誤差在021%~056%之間,可以滿足工后長期沉降預(yù)測要求。上述研究成果將為處理濱海地區(qū)高速軟土路基工程,預(yù)測和控制工后沉降提供了合理的依據(jù)。關(guān)鍵詞:濱海地區(qū);軟土路基;樁網(wǎng)復(fù)合地基;沉降;數(shù)值模擬中圖分類號(hào):TU472文獻(xiàn)標(biāo)
3、識(shí)碼:Adoi:10.3969/j.issn.1006-6055.2013.05.003ResearchonSettlementLawofPilenetCompositeFoundationofHighspeedRailwayinSoftSoilareainYingkouCityLIUBangjiaZHANGLing(CollegeofArchitectureandEngineering,LiaoningTechnicalUniversity,Fuxin123000)Abstract:Inord
4、ertoresearchthefoundationssettlement,thesoftsoilsfoundationtreatmentprojectinYingkoudongstationofHaDahighspeedrailwaywastakenastheresearchobjects.Thefoundationssettlementhasbeencontinuouslyobservedduringthefillingandpostconstruction.Thecalculationmo
5、delofthefoundationhasbeenestablishedbyADINAsoftwareandthesettlementlawofpilenetcompositefoundationwasresearched.Theresearchresultsshowthatthefoundationssettlementmainlyoccursintheembankmentfillingconstructionperiod.Thefoundationssettlementinfillingcon
6、structionperiodaccountsforabove70percentofthetotalsettlement.Thesettlementcurvesshowasinvertedbellshapedduringthefillingconstructionandhasanobviouspiercephenomenon.Thesettlementcurvesaroundthecementflyashgravepilesshowas‘∩’shape.Thesettlementspredictio
7、nempiricalformulaofthefoundationsgroundhasbeenestablishedbasingonthefieldmonitoringresults.Thecomparisonbetweentheresultsshowsthatpredictorformulahashighprecisionaftertheembankmentfillingconstructionaboutthreemonthor100days.Theerrorisbetween0.21%~0.56%b
8、etweenthefinalpredictvaluesandobservedvalues.Itspredictionprecisioncanmeetengineeringneed.Theaboveresearchachievementswillprovidearationalsuggestiononthefoundationssettlementpredictionandpostconstructioncontrolen