地铁隧道下穿既有建筑物施工影响研究

发布时间：2018-07-17 00:38

【摘要】：在建筑密集的城市修建地铁,将不可避免的影响到邻近的建筑物。地铁施工必然会扰动周围的地层,致使邻近建筑物产生附加内力和变形,从而影响建筑物的正常使用和安全。为了保证地铁施工能在建筑物正常使用的前提下安全有序施工,迫切需要研究地铁施工对邻近建筑物的影响。本文以北京地铁14号线丽泽商务区-菜户营站暗挖区间隧道下穿6号温泉酒店(独立基础)1级风险源为工程背景,通过地表现场监测数据及数值模拟计算来研究隧道穿越中对建筑物的影响。展开的研究工作与得到的结果如下： (1)在隧道的开挖过程中,地层沉降等值线呈波浪形向前、向下扩散。在建筑物基础附近,扩散发生变异,表现为沉降等值线左右不对称。位于地表沉降槽凹型区A建筑下的地表沉降等值线基本沿着基础走向分布,而位于地表沉降槽的凸型区B建筑下的地表沉降等值线为一个个大小不等的封闭圆。 (2)在隧道掌子面通过的时候：位于凹型区A建筑基础产生的沉降约占整个穿越建筑总沉降73～94%,位于凸型区B建筑基础产生的沉降占整个穿越建筑总沉降的比例与基础离隧道的距离成反比,最大比例接近100%。 (3)在隧道穿越的前后,A、B建筑物轴力受施工影响较大的分布在第一层、第二层,最大轴力都在第一层；最大轴力分别增加了14.6%、11.7%。A、B建筑物剪力受施工影响较大的分布在第一层、第二层,A建筑最大剪力出现在第一层,B建筑最大剪力出现在第二层；最大剪力分别增加了9.9%、减小了11.6%。A、B建筑物框架柱最大弯矩都出现在第二层,框架梁最大弯矩都出现在顶层；最大弯矩分别减小了2.4%、减小了3.7%。 (4)位于沉降槽凹型区A建筑,框架柱轴力、弯矩的最大值出现在掌子面通过的时候,剪力最大值出现在穿越结束之后。框架梁轴力,剪力最大值出现在穿越结束之后,弯矩出现在掌子面经过的时候。 (5)位于沉降槽凸型区B建筑,框架柱与框架梁轴力、剪力、弯矩的最大值都出现在隧道第一个开挖循环中。 (6)凹型区与凸型区上方都有建筑时,地表的沉降不是凹型区与凸型区的地表沉降矢量相加。凹型区的建筑减小地表水平位移,而凸型区的建筑加大地表水平位移。
[Abstract]:The construction of subways in densely built cities will inevitably affect nearby buildings. Subway construction will inevitably disturb the surrounding strata, resulting in additional internal force and deformation of adjacent buildings, thus affecting the normal use and safety of buildings. In order to ensure that subway construction can be carried out safely and orderly under the premise of normal use of buildings, it is urgent to study the influence of subway construction on adjacent buildings. Based on the engineering background of Grade 1 risk source of No. 6 Hot Spring Hotel (independent foundation) in Lize Business District, Caihuying Station, Beijing Metro Line 14, this paper takes the tunneling under the tunnel of No. 6 Hot Spring Hotel as the engineering background. The influence of tunnel crossing on buildings is studied by surface monitoring data and numerical simulation. The results obtained are as follows: (1) during the excavation of the tunnel, the ground subsidence isoline is wave-shaped forward and diffuses downward. In the vicinity of the building foundation, the diffusion variation occurs, which is represented by the left and right asymmetries of the settlement isoline. The surface subsidence isoline located in the concave area A of the surface subsidence trough is distributed along the foundation direction. However, the contours of surface settlement under the convex area B building are closed circles of different sizes. (2) when the tunnel face passes through, the settlement of the foundation A in the concave area is about. The settlement of the B building foundation in the convex area is inversely proportional to the distance from the tunnel to the total settlement of the whole traversing building. The maximum ratio is close to 100. (3) the axial forces of the building are distributed in the first floor, the second floor and the maximum axial force in the first floor before and after the tunnel crossing. The maximum axial force is increased by 14.6B / 11.7. the shear force of the building is greatly affected by the construction in the first floor, and the maximum shear force of the second floor appears in the first floor and the second floor; The maximum shear force is increased by 9.9, and the maximum bending moment of the frame column of the 11.6.AnB building appears on the second floor, the maximum moment of the frame beam appears on the top floor, and the maximum bending moment decreases by 2.4 percent and 3.7 percent respectively. (4) A building located in the recess zone of the settlement groove, the maximum bending moment of the frame beam appears on the top floor, and the maximum bending moment decreases by 2.4 percent and 3.7 percent respectively. When the axial force and bending moment of frame column pass through the palm, the maximum shear force appears after the end of traversing. The maximum value of axial force and shear force of frame beam appears after the end of traversing, and the moment of bending appears when passing through the face of the palm. (5) the axial force and shear force of frame column and frame beam are located in B building in the convex zone of settlement slot. The maximum value of bending moment appears in the first excavation cycle of tunnel. (6) when there are buildings above the concave zone and convex zone, the surface settlement is not the addition of the surface settlement vector between the concave zone and convex zone. The concave building reduces the horizontal displacement of the surface, while the convex area increases the horizontal displacement of the surface.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455

【参考文献】