黄土地区地铁隧道施工对地下管线影响的研究

发布时间：2018-05-17 06:40

本文选题：地铁 + 临近管线　；参考：《西安科技大学》2017年硕士论文

【摘要】：城市基础建设发展迅速,国际化大都市已日渐形成,地铁项目已在全国一线城市全面兴建。然而,地下工程的施工扰动对地层环境的影响问题也日趋凸显,地铁隧道的建设对城市既有建筑环境具有潜在的威胁。城市地铁隧道沿着城市主干道方向布设,将不可避免的穿越大量的地下管线。地铁施工将导致地下管线产生附加应力和变形,从而影响地下管线的安全性。为了保证地铁施工能够在管线正常使用的前提下安全有序的进行,这就需要学者们深入研究地铁施工对临近管线影响的规律变化情况。本文以西安地铁5号线青岳区间隧道下穿地下管线为工程背景,通过地表和地下管线沉降的现场监测数据,选取典型的污水管线为研究对象,分析监测数据,并运用数值模拟的方法,详细分析了台阶法施工对地层以及管线造成的影响。系统研究了地铁施工对临近管线的影响规律。在分析研究的过程中得到了以下结论:1、隧道施工掌子面跨过地裂缝时,地裂缝与隧道掌子面相互作用引起的地表沉降影响范围主要是在地裂缝活动强烈的变形区,地表沉降变化趋势整体呈现台阶状变化。2、在采用台阶法施工时,地下管线在一台阶施工时产生的沉降更为突出,达到了总沉降量的44.3%,二台阶占28.7%,三台阶占19.9%。因此,在施工的过程中,注重对一台阶的施工控制,可以达到减小管线沉降的作用。3、台阶法施工时,隧道施工造成的地层沉降变化情况是最大地层沉降发生在拱顶范围,最大横向收敛发生在拱腰位置。4、黄土地区新建隧道施工对既有结构的沉降影响范围在0~3.2D(D为隧道外径),沉降率变化最大的位置在1.0D附近,因此,新建隧道与重要地下管线相交时可以通过加大二者间距来消除施工的影响。
[Abstract]:Urban infrastructure has developed rapidly, international metropolis has been formed day by day, and subway projects have been built all over the country. However, the influence of underground engineering construction disturbance on the formation environment is becoming increasingly prominent, and the construction of subway tunnel has a potential threat to the existing urban building environment. The urban subway tunnel is arranged along the main road of the city, which will inevitably pass through a large number of underground pipelines. Subway construction will result in additional stress and deformation of underground pipeline, which will affect the safety of underground pipeline. In order to ensure that the subway construction can be carried out safely and orderly under the premise of the normal use of pipelines, it is necessary for scholars to deeply study the influence of subway construction on adjacent pipelines. In this paper, the underground pipeline of Qingyue section of Xi'an Metro Line 5 is taken as the engineering background. Through the monitoring data of ground surface and underground pipeline settlement, the typical sewage pipeline is selected as the research object, and the monitoring data are analyzed. The influence of step method on formation and pipeline is analyzed in detail by numerical simulation. The influence of subway construction on adjacent pipelines is systematically studied. In the course of analysis and research, the following conclusion is drawn: 1. When the face of tunnel construction passes through the ground crack, the influence range of the ground subsidence caused by the interaction between the ground crack and the tunnel face is mainly in the deformation area with strong ground fissure activity. The variation trend of surface subsidence presents step shape change as a whole. When the step method is adopted, the settlement produced by underground pipeline in the first step construction is more prominent, reaching 44.33cm of the total settlement, the second step occupies 28.7 steps and the third step occupies 19.9. Therefore, in the construction process, pay attention to the construction control of one step, can achieve the function of reducing the pipeline settlement .3.When the step method is constructed, the variation of stratum settlement caused by the tunnel construction is that the maximum ground settlement occurs in the arch roof. The maximum lateral convergence occurs at the arch position. 4. The settlement influence range of the new tunnel construction on the existing structure in loess area is 0~3.2D(D as the tunnel outer diameter, and the position where the settlement rate changes the most is near 1.0D. When the new tunnel intersects with the important underground pipeline, the influence of construction can be eliminated by increasing the distance between the two.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3;U231.3;TU990.3

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