盾构隧道注浆压力对变形影响的敏感性数值分析与研究
发布时间：2018-07-17 20:48
【摘要】：国内外的实践表明，土体的沉降变形对于使用盾构法进行施工的隧道来说是难以避免的，从安全以及工程质量等方面考虑，有必要将变形控制在合理的范围之内。诸多主要施工因素中，盾尾注浆的控制是影响土体变形沉降的最为重要的因素之一。为此，本文针对盾尾注浆出现相对于正常注浆的压力偏差时，对土体以及隧道衬砌变形的影响规律进行研究。 有限差分法是土工数值分析的重要方法，本文以广州地铁三号线某盾构区间作为数值模拟的工程基础，利用有限差分软件FLAC3D，针对不同长度的施工区间出现注浆压力偏差的情况进行模拟，对土体以及衬砌的变形规律进行了分析。 结果表明，，盾尾注浆压力偏差及偏差范围的增大引起的土体竖向变形的变化规律，在盾构掘进方向上不同长度范围内随土体的埋深、与隧道的相对距离的不同而表现出不同的规律。注浆压力偏差幅值维持不变时，对于压力偏差产生的变形，其变形收敛性受到土体所在位置以及偏差范围大小的影响。据此，本文提出，将隧道上方受压力偏差影响土体划分为注浆压力偏差范围敏感区与非敏感区。
[Abstract]:The practice at home and abroad shows that the settlement deformation of soil is unavoidable for the tunnel constructed by shield method. Considering the safety and engineering quality, it is necessary to control the deformation within a reasonable range. Among the main construction factors, the control of shield tail grouting is one of the most important factors affecting soil deformation and settlement. Therefore, this paper studies the influence law of soil and tunnel lining deformation when shield tail grouting appears relative to the normal grouting pressure deviation. The finite difference method is an important method for geotechnical numerical analysis. In this paper, a shield section of Guangzhou Metro Line 3 is taken as the engineering foundation of numerical simulation. The finite difference software FLAC3D is used to simulate the deviation of grouting pressure in different length construction sections. The deformation law of soil and lining is analyzed. The results show that the variation law of vertical deformation of soil caused by the deviation of grouting pressure and deviation range of shield tail grouting varies with the depth of soil in the different length range in the heading direction of shield tunneling. The relative distance from the tunnel shows different laws. When the amplitude of grouting pressure deviation remains constant, the deformation convergence of grouting pressure deviation is affected by the position of soil and the range of deviation. According to this, the soil affected by pressure deviation above the tunnel can be divided into sensitive zone and non-sensitive area in the range of grouting pressure deviation.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
本文编号：2130891
[Abstract]:The practice at home and abroad shows that the settlement deformation of soil is unavoidable for the tunnel constructed by shield method. Considering the safety and engineering quality, it is necessary to control the deformation within a reasonable range. Among the main construction factors, the control of shield tail grouting is one of the most important factors affecting soil deformation and settlement. Therefore, this paper studies the influence law of soil and tunnel lining deformation when shield tail grouting appears relative to the normal grouting pressure deviation. The finite difference method is an important method for geotechnical numerical analysis. In this paper, a shield section of Guangzhou Metro Line 3 is taken as the engineering foundation of numerical simulation. The finite difference software FLAC3D is used to simulate the deviation of grouting pressure in different length construction sections. The deformation law of soil and lining is analyzed. The results show that the variation law of vertical deformation of soil caused by the deviation of grouting pressure and deviation range of shield tail grouting varies with the depth of soil in the different length range in the heading direction of shield tunneling. The relative distance from the tunnel shows different laws. When the amplitude of grouting pressure deviation remains constant, the deformation convergence of grouting pressure deviation is affected by the position of soil and the range of deviation. According to this, the soil affected by pressure deviation above the tunnel can be divided into sensitive zone and non-sensitive area in the range of grouting pressure deviation.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
【参考文献】
相关期刊论文 前1条
1 范晓秋;洪宝宁;胡昕;蒋敏敏;;水泥砂浆固化土物理力学特性试验研究[J];岩土工程学报;2008年04期
本文编号：2130891
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