深埋隧道在地表高层建筑物影响下的受力分析
发布时间：2018-11-16 08:57
【摘要】：新建建筑物尤其是基础荷载较大的高层建筑物会对位于其附近的已建隧道结构造成不利影响。在实际工程监测中发现,当高层建筑物的基础在土体中产生的附加荷载较大时,其临近的隧道在附加荷载影响下会沿着一定方向发生一定程度的偏移、隧道管片外表面出现一定程度的微小变形。本文从理论上分析了在高层建筑物不同基础类型作用下临近深埋隧道的横截面受力以及隧道沿着其轴线方向受弯情况。本文主要研究工作如下:(1)本文将土体简化为半无限大弹性空间体,将两种常见的建筑物基础类型(群桩基础和箱型基础)产生的荷载分布形式简化为线性分布形式,同时运用无限大空间体中作用一竖向集中力的Mindlin应力解,通过积分得到了不同建筑物基础作用在隧道周围的荷载的理论表达式。(2)运用应力叠加原理,将隧道横截面周边受力分解为隧道四周受相同压力和只有剪力作用两种情况对隧道横截面受力进行分析:其中,在分析隧道横截面只受剪力作用时,本文将隧道和其周围土体简化为两相复合材料,运用细观力学自洽法中求解纤维状两相复合材料剪切模量提出的位移通式,通过建筑物荷载在隧道周边产生的应力边界条件和变形连续性条件,推导出了隧道横截面内的应力表达式;接着讨论了基础埋深、基础形状、基础与隧道相对距离、基础类型和衬砌厚度对横截面应力的影响;并与只有土体自重作用时隧道内横截面应力分布情况进行了对比。(3)本文通过将沿着隧道轴线方向一定长度的隧道管线简化为无限长连续弹性地基梁,运用考虑了附近土体剪切作用的Pasternak双参数弹性地基模型和Euler-Bernoulli梁理论,对在建筑物影响下隧道沿着其轴线方向产生的竖向位移w和在隧道内部产生的弯矩M进行了理论求解;讨论了建筑物基础与隧道之间的相对距离对隧道变形和受弯的影响,并与Winkler地基模型和仅有土体自重作用时的结果进行了对比。本文的相关理论解答一方面可以直接用于评估拟建建筑物对附近已建隧道的结构影响;同时,本文结论还可以应用于具有简单地层条件的实际工程中,对评估新建建筑物对其附近隧道的影响具有理论指导意义。
[Abstract]:New buildings, especially high-rise buildings with large foundation loads, will adversely affect the existing tunnel structures located near them. In the actual engineering monitoring, it is found that when the foundation of the high-rise building generates a large additional load in the soil, the adjacent tunnel will deviate in a certain direction under the influence of the additional load. The outer surface of the tunnel segment is slightly deformed to a certain extent. This paper theoretically analyses the cross section force of the adjacent deep buried tunnel under the action of different foundation types of high-rise buildings and the bending of the tunnel along its axis. The main work of this paper is as follows: (1) in this paper, the soil mass is simplified as a semi-infinite elastic space, and the load distribution forms of two common building foundation types (pile group foundation and box foundation) are simplified to linear distribution form. At the same time, by using the Mindlin stress solution of a vertical concentrated force acting on an infinite space body, the theoretical expressions of the loads acting on different building foundations around the tunnel are obtained by integral. (2) the principle of stress superposition is used. The forces around the tunnel cross section are decomposed into two situations: the same pressure around the tunnel and only shear force acting on the tunnel cross section, in which the tunnel cross section is only subjected to shear force. In this paper, the tunnel and its surrounding soil are simplified as two-phase composite materials, and the general displacement formula for the shearing modulus of fibrous two-phase composites is obtained by using the meso-mechanical self-consistent method. Based on the stress boundary conditions and deformation continuity conditions of the surrounding tunnel caused by the building load, the stress expression in the tunnel cross section is derived. Then the influence of the depth of foundation, the shape of foundation, the relative distance between foundation and tunnel, the type of foundation and the thickness of lining on the cross-section stress is discussed. The stress distribution of cross section in tunnel is compared with only soil mass. (3) in this paper, the tunnel pipeline with certain length along the tunnel axis is simplified as an infinite continuous elastic foundation beam. Based on the Pasternak two-parameter elastic foundation model and the Euler-Bernoulli beam theory, the vertical displacement w produced by the tunnel along its axis under the influence of the building and the bending moment M generated inside the tunnel are solved theoretically by using the Pasternak two-parameter elastic foundation model and the Euler-Bernoulli beam theory. The influence of the relative distance between the building foundation and the tunnel on the deformation and bending of the tunnel is discussed, and the results are compared with the Winkler foundation model and the results of the soil mass only. On the one hand, the theoretical solution of this paper can be directly used to evaluate the structural impact of the proposed building on the nearby tunnel. At the same time, the conclusion of this paper can also be applied to the practical engineering with simple formation conditions, which has theoretical guidance significance for evaluating the influence of new buildings on the tunnel nearby.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U451
本文编号：2335082
[Abstract]:New buildings, especially high-rise buildings with large foundation loads, will adversely affect the existing tunnel structures located near them. In the actual engineering monitoring, it is found that when the foundation of the high-rise building generates a large additional load in the soil, the adjacent tunnel will deviate in a certain direction under the influence of the additional load. The outer surface of the tunnel segment is slightly deformed to a certain extent. This paper theoretically analyses the cross section force of the adjacent deep buried tunnel under the action of different foundation types of high-rise buildings and the bending of the tunnel along its axis. The main work of this paper is as follows: (1) in this paper, the soil mass is simplified as a semi-infinite elastic space, and the load distribution forms of two common building foundation types (pile group foundation and box foundation) are simplified to linear distribution form. At the same time, by using the Mindlin stress solution of a vertical concentrated force acting on an infinite space body, the theoretical expressions of the loads acting on different building foundations around the tunnel are obtained by integral. (2) the principle of stress superposition is used. The forces around the tunnel cross section are decomposed into two situations: the same pressure around the tunnel and only shear force acting on the tunnel cross section, in which the tunnel cross section is only subjected to shear force. In this paper, the tunnel and its surrounding soil are simplified as two-phase composite materials, and the general displacement formula for the shearing modulus of fibrous two-phase composites is obtained by using the meso-mechanical self-consistent method. Based on the stress boundary conditions and deformation continuity conditions of the surrounding tunnel caused by the building load, the stress expression in the tunnel cross section is derived. Then the influence of the depth of foundation, the shape of foundation, the relative distance between foundation and tunnel, the type of foundation and the thickness of lining on the cross-section stress is discussed. The stress distribution of cross section in tunnel is compared with only soil mass. (3) in this paper, the tunnel pipeline with certain length along the tunnel axis is simplified as an infinite continuous elastic foundation beam. Based on the Pasternak two-parameter elastic foundation model and the Euler-Bernoulli beam theory, the vertical displacement w produced by the tunnel along its axis under the influence of the building and the bending moment M generated inside the tunnel are solved theoretically by using the Pasternak two-parameter elastic foundation model and the Euler-Bernoulli beam theory. The influence of the relative distance between the building foundation and the tunnel on the deformation and bending of the tunnel is discussed, and the results are compared with the Winkler foundation model and the results of the soil mass only. On the one hand, the theoretical solution of this paper can be directly used to evaluate the structural impact of the proposed building on the nearby tunnel. At the same time, the conclusion of this paper can also be applied to the practical engineering with simple formation conditions, which has theoretical guidance significance for evaluating the influence of new buildings on the tunnel nearby.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U451
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