本文關鍵詞：下穿既有建筑物暗挖地鐵隧道圍巖及地表變形規(guī)律研究　出處：《西安科技大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 既有建筑物 礦山法 地鐵隧道 FLAC模擬 變形監(jiān)測

【摘要】：開展黃土地區(qū)淺埋暗挖地鐵隧道下穿既有建筑物施工誘發(fā)的圍巖及地表變形規(guī)律研究具有重要價值。本文依托西安地鐵4號線某淺埋暗挖地鐵區(qū)間隧道工程,采用理論分析、數值模擬與現場監(jiān)測相結合的方法進行研究工作,主要結論有:(1)分析黃土地鐵隧道下穿既有建筑物礦山法施工的地表及建筑物沉降主要因素包括:工程地質條件、建筑物基礎類型、建筑物與隧道洞身的水平距離和豎直距離等。分析黃土地鐵隧道圍巖變形主要因素包括:隧道所處地層黃土物理力學特性、開挖斷面尺寸、隧道埋深、隧道開挖方法、地層損失、施工組織管理。對地層變形機理進行分析。(2)以西安地鐵4號線某暗挖區(qū)間隧道為工程依托,采用FLAC3D軟件建立下穿既有建筑的黃土地鐵隧道三維計算模型,對暗挖區(qū)間隧道可行的CD法、CRD法和上下臺階法等三種施工工法誘發(fā)的圍巖及地表變形規(guī)律進行仿真預測。結果表明,CRD工法施工在控制圍巖變形、地表及建筑物沉降上,效果最佳,CD工法次之,上下臺階預留核心土法誘發(fā)的地表及建筑物沉降最大。提出了下穿既有建筑物暗挖區(qū)間隧道礦山法施工采用CRD工法進行施工的建議。(3)FLAC分析表明,隧道正穿既有建筑物施工對建筑物的豎向沉降影響較大,建筑物的差異沉降較小,旁穿既有建筑物隧道施工后的建筑物的變形較小,但是引起的建筑物差異沉降較大,建筑物易發(fā)生不均勻沉降。下穿既有建筑物淺埋地鐵隧道暗挖施工引起的圍巖變形規(guī)律演化過程經歷了緩慢增長、急劇變形、基本穩(wěn)定三個階段。提出了暗挖地鐵隧道地層加固措施并進行了 FLAC分析,表明提出的采取加固措施的CRD工法可以保證隧道安全下穿既有建筑物。(4)制定了隧道礦山法施工降水方案、地表以及建筑物的沉降變形監(jiān)測方案。實踐表明,提出的暗挖隧道采用CRD工法施工后的圍巖變形、地表及建筑物沉降均在可控范圍內,監(jiān)測值與FLAC預測值基本吻合。
[Abstract]:In loess area of Shallow Metro Tunnel under has important value in research on deformation of surrounding rock and surface construction of buildings. This paper induced by relying on the Xi'an subway line 4 subway tunnel engineering, using theoretical analysis, numerical simulation and field monitoring method in combination with the research work, the main conclusions are: (1) analysis of loess subway tunnel under the main factors including the surface subsidence and building mine construction method: engineering geological conditions, type of building foundation, the building and the tunnel's horizontal and vertical distance. Including the analysis of surrounding rock of loess subway tunnel deformation factors: physical and mechanical properties of the strata at the loess tunnel the excavation, section size, tunnel depth, tunnel excavation method, ground loss, construction organization and management. The stratum deformation mechanism was analyzed. (2) in Xi'an Metro Line 4 A tunnel based on the project, using FLAC3D software to establish the crossing under the existing subway tunnel in Loess three-dimensional model building, the CD tunnel is feasible, this paper simulated the rules of deformation and surface CRD method and step method of three kinds of construction methods induced. The results show that the CRD method in the construction control surrounding rock deformation, surface subsidence and effect on buildings, the best, CD method of ground and building on the bench reservation core soil settlement induced by maximum is proposed. Through existing construction by using the CRD method of construction building the tunnel mining method is proposed. FLAC analysis showed that, (3) the tunnel is in both the vertical construction of buildings on building settlement influence, building the differential settlement is small, alongside a smaller deformation of existing buildings after the tunnel construction of the building, but the building caused by the difference The settlement of large buildings prone to uneven settlement. Beneath the existing building deformation law of surrounding rock of shallow buried subway tunnel caused by excavation construction of evolution has experienced slow growth, sharp deformation, the basic stability of three stages is proposed. The metro tunnel reinforcement measures and the FLAC analysis shows that the proposed by CRD method of reinforcing measures can ensure the safety of the tunnel beneath the existing buildings. (4) developed a mine tunnel construction dewatering scheme, and surface subsidence deformation monitoring scheme. Practice shows that the tunnel surrounding rock deformation by CRD construction method of ground and building settlement is in the controllable range, the value of monitoring and FLAC prediction value basically.

【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U451.2

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