浅埋暗挖隧道下穿古建筑相互影响研究

发布时间：2018-03-21 01:11

本文选题：双侧壁导坑法　切入点：开挖步序　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国国民经济的不断发展,城市化进程不断加快,城市人口和城市中的机动车辆越来越多,无形中给地面交通增加了很大压力。由于现代化城市要向高效率和集约化方向发展,城市总体规划要在一定空间范围内,因而城市地上空间的利用率越来越高,为了城市更好的发展,人们开始利用城市的地下空间,特别是像兰州这样处在群山环抱中的城市,由于地上空间有限,因而未来开发利用地下空间是一种趋势。开发城市的地下空间,比如修建地铁,开挖地下隧道或者修建地下停车场,修建地下商场等等,无疑会对地上建筑造成影响。本论文依托兰州市白塔山隧道下穿古建筑群这一工程,利用理论和Flac3D数值分析两种方法,研究了隧道开挖和地表建筑之间的相互影响。主要的研究内容和成果为:1采用有限元差分软件Flac3D研究了双侧壁导坑法适用于本工程的开挖步序,为了更好的控制地表沉降,开挖双线隧道时,优先开挖深埋侧隧道,并优先开挖浅埋侧导洞。2通过有限元差分软件Flac3D研究了隧道开挖时的地表沉降,从中总结出双侧壁导坑法施工时隧道沉降规律:开挖中导洞时引起的拱顶沉降最大,能占到拱顶沉降的30%到40%;隧道的拱顶沉降深埋侧要大于浅埋侧;水平收敛浅埋侧要大于深埋侧。3总结了前人对Peck公式的研究成果,对Peck公式中主要的两个参数采用下列方法计算:沉降槽宽度系数i通过前人总结的三种不同公式求平均值得到;地层损失通过经验总结得到,本文选取偏保守的1%和3%作为最小和最大地层损失率求出地层损失的一个范围。随后利用Peck公式计算了隧道关键点处的沉降范围,作为后续研究的一个理论参考范围。同时,还利用数值模拟的方法验证了Peck公式的合理性。4在Peck公式计算所得理论值的基础上,结合数值模拟方法研究了隧道开挖和地表建筑的相互影响,发现地表建筑对隧道沉降影响很小,但隧道开挖会引起某些位置建筑的不均匀沉降。5研究了控制隧道沉降的一些因素,通过选择恰当的开挖步序,及时支护,选择合适的支护方式以及支护参数能有效控制地表沉降。
[Abstract]:With the development of our national economy and the accelerating process of urbanization, there are more and more urban population and motor vehicles in cities. As a result of the development of modern cities towards high efficiency and intensive development, the overall urban planning should be within a certain space range, so the utilization rate of urban land space is becoming higher and higher. For the better development of the city, people began to make use of the underground space of the city, especially the city such as Lanzhou, which is surrounded by mountains, because of the limited space on the ground. Therefore, the future development and utilization of underground space is a trend. Underground space in developing cities, such as the construction of subways, excavation of underground tunnels or underground parking lots, construction of underground shopping malls, and so on. There is no doubt that the above ground building will be affected. Based on the project of Baitashan Tunnel in Lanzhou City, this paper makes use of two methods: theory and Flac3D numerical analysis. This paper studies the interaction between tunnel excavation and surface building. The main research contents and results are as follows: 1. Using finite element difference software Flac3D, the two-side wall guide pit method is applied to the excavation sequence of the project, in order to better control the surface settlement, In the excavation of double-line tunnel, priority is given to excavation of deep buried side tunnel, and preferential excavation of shallow buried side tunnel .2 through finite element difference software Flac3D to study the surface settlement during tunnel excavation. This paper summarizes the settlement law of the tunnel in the construction of double-side wall guide pit method: the settlement of arch roof caused by excavation is the largest, which can account for 30% to 40 percent of the settlement of arch roof, the deep buried side of tunnel dome settlement is larger than that of shallow buried side; The horizontal convergence of shallow buried side is greater than that of deep buried side. 3. The results of previous researches on Peck formula are summarized. The two main parameters of the Peck formula are calculated by the following methods: the width coefficient of the settlement trough I is obtained by the average value of three different formulas summarized by the predecessors, the formation loss is obtained by the experience summary, In this paper, the conservative values of 1% and 3% are selected as a range of minimum and maximum formation loss rates. Then the settlement range at the key points of the tunnel is calculated by using Peck formula, which is used as a theoretical reference range for further study. The rationality of Peck formula is verified by numerical simulation. 4 based on the theoretical value calculated by Peck formula, the interaction between tunnel excavation and surface building is studied in combination with numerical simulation method. It is found that the surface building has little influence on the tunnel settlement, but the uneven settlement of the building caused by the excavation of the tunnel will cause some factors to control the settlement of the tunnel. The surface subsidence can be effectively controlled by selecting appropriate supporting methods and supporting parameters.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455;TU433

【参考文献】