双圆盾构隧道施工偏转角对地表变形影响研究

发布时间：2018-05-14 08:11

本文选题：隧道工程 + 双圆盾构　；参考：《岩石力学与工程学报》2015年12期

【摘要】：双圆盾构隧道施工中土体变形控制和纠偏控制是其主要的技术难点。在分析双圆盾构隧道施工中盾构机偏转特性的基础上,基于随机介质理论,采用坐标变换和分区域积分,推导双圆盾构隧道施工中偏转角与地表沉降和水平变形的函数关系式。通过实例计算,分析偏转角对地表变形的影响规律。结果表明:偏转将导致地表产生附加变形,使地表变形曲线由对称变为非对称;地表沉降曲线存在3个焦点(V_1,V_2和V_3),水平变形曲线存在4个焦点(H_1,H_2,H_3和H_4),每个焦点左右两边土体的附加变形方向相反。对于逆时针偏转,V_1左边和V_2,V_3之间的土体附加竖向变形为隆起,V_3右边和V_1,V_2之间的土体附加竖向变形为沉降;H_1与H_2之间、H_3与H_4之间的土体产生正的附加水平变形,而H_2与H_3之间、H_1以左和H_4以右的土体产生负的附加水平变形。最大地表沉降随偏转角增大呈非线性增加,且其位置向左移动;最大右向水平地表变形呈线性增加,最大左向水平地表变形先减小后增加;水平地表变形的平衡点逐渐向左移动。对于顺时针偏转,焦点两边土体的附加变形方向与逆时针偏转相反,且最大右向水平地表变形随偏转角增大而减小,最大地表沉降位置和平衡点逐渐向右移动。
[Abstract]:Soil deformation control and deviation correction control are the main technical difficulties in the construction of double-circle shield tunnel. Based on the analysis of the deflection characteristics of shield machine in the construction of double circular shield tunnel, based on the theory of random medium, the functional expression of deflection angle, surface settlement and horizontal deformation in construction of double circle shield tunnel is derived by using coordinate transformation and regional integration. The influence of deflection angle on surface deformation is analyzed by example calculation. The results show that the deflection will result in additional deformation of the surface and change the deformation curve from symmetry to asymmetry. There are three focal points in the surface settlement curve, namely, V _ S _ 1 / V _ (2) and V _ (3), and there are four focal points on the horizontal deformation curve: H1D / H _ 2H _ (2) / H _ (4) and H _ (4). The direction of additional deformation of the soil on the left and right sides of each focal point is opposite. As for the additional vertical deformation of the soil between the left side of V _ S _ 1 and V _ 2V _ S _ 3, the additional vertical deformation of the soil mass between the right side of V _ S _ 3 and V _ 1 / V _ 2 is a positive horizontal deformation of the soil between H3 and H4, and the additional vertical deformation of the soil between V _ S _ 1 and V _ 1 / V _ 2 is a positive horizontal deformation of the soil between H3 and H4, However, between Hs _ 2 and H _ S _ 3, there is a negative additional horizontal deformation in the left and right soil. The maximum surface subsidence increases linearly with the increase of deflection angle, and its position moves to the left, the maximum horizontal surface deformation increases linearly, and the maximum left horizontal surface deformation decreases first and then increases. The equilibrium point of horizontal surface deformation gradually moves to the left. For clockwise deflection, the direction of additional deformation of soil on both sides of the focus is opposite to that of counterclockwise deflection, and the maximum horizontal surface deformation decreases with the increase of deflection angle, and the maximum ground subsidence position and equilibrium point gradually move to the right.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家自然科学基金面上项目(41172243) 中央高校基本科研业务费重点项目(CDJZR12205501)~~
【分类号】：U455.43

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