【摘要】：黃土地鐵隧道盾構施工引起地層沉降,影響周圍既有建筑安全,并制約盾構快速施工。在理論分析飽和黃土地鐵隧道圍巖力學特性、變形機理以及地層沉降變形機理基礎上,總結地鐵隧道施工方案的可行性影響因素;結合工程實例,利用ANSYS建立三維模型,FLAC3D對飽和黃土隧道盾構施工進行數(shù)值模擬,研究隧道掘進在不同覆土層厚度、施工速度及壁后注漿加固條件下的地層沉降及隆起規(guī)律,并提出該工程隧道施工沉降預測及沉降控制措施。研究表明:(1)開挖距隧道模型邊界24m以后,地層的沉降及隆起位移開始增長緩慢;開挖至42m時,拱頂?shù)某两抵�、拱底的隆起值達到最大,分別為2.3719cm與2.5094cm。通過對研究結果和工程監(jiān)測數(shù)據(jù)進行對比分析,得出采用盾構法穿越飽和軟黃土地層是可行的,符合規(guī)范及工程實際要求。(2)覆土層厚度從8m增大到16m時,地表最大沉降由1.5057cm減小至1.1297cm,拱頂最大沉降由2.6497cm減小至2.2537cm,覆土層厚度在13m以后地表及拱頂沉降變化平緩,因此合理的覆土層厚度為取10m~13m。(3)施工速度從0.5m/d增大到4m/d時,地表最大沉降增加約31.91%,拱頂最大沉降增加約23.15%。在滿足工期的條件下,施工速度應控制在2m/d以內。(4)注漿材料彈性模量為0.46MPa、4.6MPa、46MPa時,地表最大沉降分別為1.2855cm、1.2245cm和1.1736cm,拱頂最大沉降量分別為2.4655cm、2.3719cm和2.2886cm。研究成果為類似工程施工提供了參考。
[Abstract]:The ground settlement caused by shield construction of loess subway tunnel affects the safety of existing buildings and restricts the rapid construction of shield tunneling. On the basis of theoretical analysis of mechanical characteristics, deformation mechanism and settlement deformation mechanism of surrounding rock of saturated loess subway tunnel, the paper summarizes the feasibility influencing factors of subway tunnel construction scheme, and combines with engineering examples, The numerical simulation of shield construction of saturated loess tunnel is carried out by using ANSYS model and FLAC3D, and the settlement and uplift law of tunnel excavation under different overburden thickness, construction speed and grouting reinforcement behind the wall are studied. The settlement prediction and settlement control measures of tunnel construction are put forward. The results show that: (1) after the excavation is 24m from the tunnel model boundary, the ground subsidence and uplift displacement increase slowly, and when excavation reaches 42m, the settlement value of the arch top and the uplift value of the arch bottom reach the maximum, which are 2.3719cm and 2.5094 cm, respectively. Through the comparison and analysis of the research results and the engineering monitoring data, it is concluded that it is feasible to use shield tunneling method to cross the saturated soft loess layer, which meets the requirements of the code and the engineering practice. (2) when the thickness of the overlying soil increases from 8 m to 16 m, The maximum surface settlement is reduced from 1.5057cm to 1.1297 cm, the maximum settlement of arch roof is reduced from 2.6497cm to 2.2537 cm, and the thickness of overlying soil layer changes slowly after 13 m. Therefore, the reasonable thickness of overlying soil layer is 10 m ~ (13) m. (3) when the construction speed is increased from 0.5m/d to 4m/d, The maximum settlement of the earth's surface increased about 31.91%, and the maximum settlement of the vault increased about 23.15%. Under the condition that the construction period is satisfied, the construction speed should be controlled within 2m/d. (4) when the elastic modulus of grouting material is 0.46 MPA, the maximum surface subsidence is 1.2855 cm ~ (-1) and 1.1736 cm, and the maximum settlement of arch is 2.4655 cm ~ (-1) ~ 2.3719 cm and 2.2886 cm ~ (-1) respectively. The research results provide a reference for the construction of similar projects.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U455.43;U231.3

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