现代隧道技术
現代隧道技術
현대수도기술
MODERN TUNNELLING TECHNOLOGY
2014年
6期
101-107
,共7页
PBA工法%地铁车站%下穿桥梁%临近桩基%数值模拟%层次分析法
PBA工法%地鐵車站%下穿橋樑%臨近樁基%數值模擬%層次分析法
PBA공법%지철차참%하천교량%림근장기%수치모의%층차분석법
PBA construction method%Subway station%Passing under a bridge%Adjacent pile foundation%Numerical simulation%Analytic hierarchy process
文章以北京地铁6号线花园桥站下穿花园桥为工程背景，采用FLAC3D数值模拟和层次分析法确定PBA工法(Pile-Beam-Arch Method)地铁车站下穿桥梁的最优方案，并结合监测结果分析了关键施工阶段对地层和桩基的影响。研究表明，同等注浆加固条件下4导洞法控制远、近侧桩基位移效果比5，6导洞法稍好，相同车站施工方法和结构型式下对近侧桥桩区域适当注浆加固和大范围注浆加固效果相近，因此，确定5导洞法及近侧桥桩区域内适当注浆加固为最优方案；导洞开挖、扣拱和其它工序地表沉降比例为0.38∶0.32∶0.30；导洞开挖和扣拱对近侧桩基位移影响较大，站台层开挖对远侧桩基沉降影响最大，导洞开挖和扣拱影响次之，但对水平位移影响较大。
文章以北京地鐵6號線花園橋站下穿花園橋為工程揹景，採用FLAC3D數值模擬和層次分析法確定PBA工法(Pile-Beam-Arch Method)地鐵車站下穿橋樑的最優方案，併結閤鑑測結果分析瞭關鍵施工階段對地層和樁基的影響。研究錶明，同等註漿加固條件下4導洞法控製遠、近側樁基位移效果比5，6導洞法稍好，相同車站施工方法和結構型式下對近側橋樁區域適噹註漿加固和大範圍註漿加固效果相近，因此，確定5導洞法及近側橋樁區域內適噹註漿加固為最優方案；導洞開挖、釦拱和其它工序地錶沉降比例為0.38∶0.32∶0.30；導洞開挖和釦拱對近側樁基位移影響較大，站檯層開挖對遠側樁基沉降影響最大，導洞開挖和釦拱影響次之，但對水平位移影響較大。
문장이북경지철6호선화완교참하천화완교위공정배경，채용FLAC3D수치모의화층차분석법학정PBA공법(Pile-Beam-Arch Method)지철차참하천교량적최우방안，병결합감측결과분석료관건시공계단대지층화장기적영향。연구표명，동등주장가고조건하4도동법공제원、근측장기위이효과비5，6도동법초호，상동차참시공방법화결구형식하대근측교장구역괄당주장가고화대범위주장가고효과상근，인차，학정5도동법급근측교장구역내괄당주장가고위최우방안；도동개알、구공화기타공서지표침강비례위0.38∶0.32∶0.30；도동개알화구공대근측장기위이영향교대，참태층개알대원측장기침강영향최대，도동개알화구공영향차지，단대수평위이영향교대。
Based on the Huayuanqiao station of Beijing Metro Line 6, which passes under the Huayuan bridge, an optimal scheme for the subway station, which is constructed by the Pile-Beam-Arch (PBA) method, is determined by FLAC3D numerical simulation and the analytic hierarchy process (AHP). The impact of key construction stages on the stratum and pile foundation is analyzed in conjunction with the monitoring results. The research shows that: the effects of the four-heading method on control of the pile foundation displacement at the far and near sides is better than that of the five/six-heading method under the same grouting reinforcement conditions;the effects of the appropriate grouting reinforcement on the bridge-pile area at the near side is similar to that of wide-range grouting reinforcement if the construction methods and structures of the stations are the same; after comprehensive consideration, a five-heading method with appropriate grouting reinforcement is determined to be the optimal scheme; the ratio of surface subsidence of the heading excavation, buckle arch, and other construction procedures is 0.38∶0.32∶0.30; construction of the heading and buckle arch has a large impact on pile foundation displacement at the near side; and excavation of the platform has the most serious impact on pile foundation settlement at the far side, with heading excavation and the buckle arch taking second place (the latter greatly affects horizontal displacement).
