南宁盆地地铁双隧道施工地表沉降规律研究

发布时间：2018-02-25 00:24

本文关键词： 双隧道影响地质单元横向沉降 Peck公式纵向沉降　出处：《广西大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着城市建设的不断发展,城市地铁成为越来越受欢迎的交通方式,而目前南宁的地铁建设正在火热的进行中。地铁隧道的修建往往是以双孔平行的形式进行的,由于滞后的第二条隧道与第一条隧道间的相互影响,就使得双孔平行隧道的施工比单孔的复杂。南宁地铁主要穿越膨胀泥岩地区,也有大部分穿过圆砾夹层,这样由于施工引起的地表沉降对周边及隧道施工有着重要的影响,有必要对南宁地铁隧道施工双线影响的地表沉降进行研究,这将对工程的研究分析提供一定的参考作用。本文根据南宁地铁几个区间段的的施工地表沉降实测资料,利用Peck公式研究地铁隧道施工时由于双线叠加影响地表最终沉降的规律特点,得出到适用于南宁盆地隧道作业面穿越圆砾层、粉砂岩层地质单元的横向预测公式的参数及沉降规律。主要研究内容包括:1.分析地铁隧道双线施工影响下地表沉降的原理及测点的布置概况。2.根据收集到的实测资料,分析地表横断面沉降的特点,利用Peck公式进行计算拟合,并对比分析两种典型地质单元下地表总沉降的形成规律。3.根据实测资料,对隧道地表纵向沉降数据进行分析,研究南宁盆地隧道作业面穿越粉砂岩地区的纵向沉降滞后发展的规律。经过上述研究主要结论有:考虑双线叠加影响,南宁盆地隧道作业面穿圆砾层区,地表横断面沉降曲线基本呈现单峰特征,穿粉砂岩区,地表横断面沉降曲线基本呈现双峰特征,利用考虑双线影响下的Peck公式拟合效果良好,本文给出的这两种作业面地质条件下的地表横向预测公式有实际研究意义;考虑双线隧道开挖相互的叠加作用,在这两种地质条件下,对地表纵向沉降规律进行分析,发现地质条件和相对水平系数都对该沉降有重要影响;施工中,地铁两隧道滞后修建的影响,Peck三维修正公式并不适用于南宁盆地穿圆砾层和粉砂岩层地质单元条件下地铁双线施工引起的地表纵向沉降的预测。
[Abstract]:With the continuous development of urban construction, urban subway has become a more and more popular mode of transportation, and the subway construction in Nanning is in hot progress. The construction of subway tunnel is often carried out in the form of two-hole parallel. Due to the interaction between the second tunnel and the first tunnel, the construction of two-hole parallel tunnel is more complicated than that of single hole. As the ground subsidence caused by construction has an important influence on the surrounding and tunnel construction, it is necessary to study the surface settlement of Nanning subway tunnel. This will provide a certain reference for the research and analysis of the project. Using Peck formula to study the characteristics of the law that the double line superposition affects the final subsidence of the ground surface in the subway tunnel construction, it is concluded that it is suitable for the tunnel operation surface of Nanning Basin to cross the round gravel layer. Parameters and settlement rules of lateral prediction formula for silty rock geological units. The main research contents include: 1. Analysis of the principle of ground subsidence and survey points layout under the influence of double-line construction of subway tunnel. 2. According to the measured data collected, This paper analyzes the characteristics of surface cross-section settlement, calculates and fits it by using Peck formula, and compares and analyzes the formation rule of total surface subsidence under two typical geological units .3.According to the measured data, the longitudinal settlement data of tunnel surface are analyzed. This paper studies the law of longitudinal subsidence lag development of tunnel surface crossing siltstone area in Nanning basin. The main conclusions are as follows: considering the influence of double line superposition, the tunnel surface of Nanning basin passes through round gravel zone, The surface cross section settlement curve basically presents the single peak characteristic, the surface cross section settlement curve basically presents the double peak characteristic in the siltstone area, and the fitting effect is good by using the Peck formula considering the influence of the double lines. In this paper, it is of practical significance to study the formula of surface lateral prediction under these two kinds of geological conditions, considering the superposition of the excavation of double-line tunnel, the law of surface longitudinal subsidence is analyzed under these two geological conditions. It is found that both geological conditions and relative horizontal coefficients have important effects on the settlement. The influence of the delayed construction of two subway tunnels on the Peck three-dimensional correction formula is not suitable for the prediction of the longitudinal subsidence of the surface caused by the double-line construction of the subway in Nanning Basin under the condition of the geological unit of the round gravel and silty rock strata.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455;P642.26

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