饱和软黄土地铁隧道盾构施工控制技术
发布时间：2018-08-12 12:16
【摘要】：黄土地铁隧道盾构施工引起地层沉降,影响周围既有建筑安全,并制约盾构快速施工。在理论分析饱和黄土地铁隧道围岩力学特性、变形机理以及地层沉降变形机理基础上,总结地铁隧道施工方案的可行性影响因素;结合工程实例,利用ANSYS建立三维模型,FLAC3D对饱和黄土隧道盾构施工进行数值模拟,研究隧道掘进在不同覆土层厚度、施工速度及壁后注浆加固条件下的地层沉降及隆起规律,并提出该工程隧道施工沉降预测及沉降控制措施。研究表明:(1)开挖距隧道模型边界24m以后,地层的沉降及隆起位移开始增长缓慢;开挖至42m时,拱顶的沉降值、拱底的隆起值达到最大,分别为2.3719cm与2.5094cm。通过对研究结果和工程监测数据进行对比分析,得出采用盾构法穿越饱和软黄土地层是可行的,符合规范及工程实际要求。(2)覆土层厚度从8m增大到16m时,地表最大沉降由1.5057cm减小至1.1297cm,拱顶最大沉降由2.6497cm减小至2.2537cm,覆土层厚度在13m以后地表及拱顶沉降变化平缓,因此合理的覆土层厚度为取10m~13m。(3)施工速度从0.5m/d增大到4m/d时,地表最大沉降增加约31.91%,拱顶最大沉降增加约23.15%。在满足工期的条件下,施工速度应控制在2m/d以内。(4)注浆材料弹性模量为0.46MPa、4.6MPa、46MPa时,地表最大沉降分别为1.2855cm、1.2245cm和1.1736cm,拱顶最大沉降量分别为2.4655cm、2.3719cm和2.2886cm。研究成果为类似工程施工提供了参考。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U455.43;U231.3
本文编号：2179030
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U455.43;U231.3
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