盾构隧道施工对既有建筑物桩基的影响分析
发布时间：2018-10-08 11:29
【摘要】：针对地铁隧道常用的盾构开挖方式,本文采用数值模拟和经验公式相结合的方法,研究了盾构隧道开挖对周围地层变形以及邻近桩基的影响规律,并进一步研究了在不同的地层损失率、土仓压力以及桩顶约束情况下盾构掘进对邻近桩基的影响。 本文主要研究结论如下： 1.在考虑了开挖面的扰动、土仓压力、盾壳与土层间的摩擦力以及注浆层对地表沉降影响的基础上,对盾构隧道的施工过程进行了模拟,研究了隧道轴线方向上盾构施工引起的地表沉降的影响区域。 2.研究了盾构施工对临近基桩的沉降及弯矩影响规律。结果表明,开挖至基桩位置时,基桩的沉降速率最大,垂直于隧道轴线方向的弯矩最大。 3.对比分析了盾构施工时不同的地层损失率和土仓压力对临近基桩沉降影响。结果表明,基桩桩顶沉降随着地层损失率的增大而增加,随着土仓压力的减小而增加。 4.研究了盾构施工过程时桩顶约束对对基桩的影响。结果表明,桩顶约束仅对桩身上部的变形和弯矩有较大影响,而对基桩沉降、附加轴力和侧摩阻力的影响较小。
[Abstract]:In this paper, the influence of shield tunnel excavation on surrounding ground deformation and adjacent pile foundation is studied by means of numerical simulation and empirical formula. The influence of shield tunneling on the adjacent pile foundation is further studied under the conditions of different loss rate of formation, pressure of soil bunker and the constraint of pile top. The main conclusions of this paper are as follows: 1. On the basis of considering the disturbance of excavating surface, the pressure of earth bunker, the friction between shield shell and soil layer and the influence of grouting layer on surface settlement, the construction process of shield tunnel is simulated. The influence area of ground subsidence caused by shield construction in the direction of tunnel axis is studied. 2. The influence of shield construction on settlement and bending moment of adjacent piles is studied. The results show that the settlement rate of the foundation pile is the largest and the bending moment perpendicular to the tunnel axis is the largest when the pile is excavated to the position of the foundation pile. 3. The effects of different ground loss rate and soil chamber pressure on the settlement of adjacent piles during shield construction are compared and analyzed. The results show that the settlement of the pile top increases with the increase of the loss rate of the ground and increases with the decrease of the pressure of the soil bunker. 4. The influence of pile top constraint on foundation pile during shield construction is studied. The results show that the top constraint of the pile only has a great effect on the deformation and bending moment of the pile body, but has little effect on the settlement of the foundation pile, the additional axial force and the lateral friction.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;TU473.1
本文编号：2256581
[Abstract]:In this paper, the influence of shield tunnel excavation on surrounding ground deformation and adjacent pile foundation is studied by means of numerical simulation and empirical formula. The influence of shield tunneling on the adjacent pile foundation is further studied under the conditions of different loss rate of formation, pressure of soil bunker and the constraint of pile top. The main conclusions of this paper are as follows: 1. On the basis of considering the disturbance of excavating surface, the pressure of earth bunker, the friction between shield shell and soil layer and the influence of grouting layer on surface settlement, the construction process of shield tunnel is simulated. The influence area of ground subsidence caused by shield construction in the direction of tunnel axis is studied. 2. The influence of shield construction on settlement and bending moment of adjacent piles is studied. The results show that the settlement rate of the foundation pile is the largest and the bending moment perpendicular to the tunnel axis is the largest when the pile is excavated to the position of the foundation pile. 3. The effects of different ground loss rate and soil chamber pressure on the settlement of adjacent piles during shield construction are compared and analyzed. The results show that the settlement of the pile top increases with the increase of the loss rate of the ground and increases with the decrease of the pressure of the soil bunker. 4. The influence of pile top constraint on foundation pile during shield construction is studied. The results show that the top constraint of the pile only has a great effect on the deformation and bending moment of the pile body, but has little effect on the settlement of the foundation pile, the additional axial force and the lateral friction.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;TU473.1
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