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  本文關(guān)鍵詞： 雙隧道影響 地質(zhì)單元 橫向沉降 Peck公式 縱向沉降　出處：《廣西大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著城市建設的不斷發(fā)展,城市地鐵成為越來越受歡迎的交通方式,而目前南寧的地鐵建設正在火熱的進行中。地鐵隧道的修建往往是以雙孔平行的形式進行的,由于滯后的第二條隧道與第一條隧道間的相互影響,就使得雙孔平行隧道的施工比單孔的復雜。南寧地鐵主要穿越膨脹泥巖地區(qū),也有大部分穿過圓礫夾層,這樣由于施工引起的地表沉降對周邊及隧道施工有著重要的影響,有必要對南寧地鐵隧道施工雙線影響的地表沉降進行研究,這將對工程的研究分析提供一定的參考作用。本文根據(jù)南寧地鐵幾個區(qū)間段的的施工地表沉降實測資料,利用Peck公式研究地鐵隧道施工時由于雙線疊加影響地表最終沉降的規(guī)律特點,得出到適用于南寧盆地隧道作業(yè)面穿越圓礫層、粉砂巖層地質(zhì)單元的橫向預測公式的參數(shù)及沉降規(guī)律。主要研究內(nèi)容包括:1.分析地鐵隧道雙線施工影響下地表沉降的原理及測點的布置概況。2.根據(jù)收集到的實測資料,分析地表橫斷面沉降的特點,利用Peck公式進行計算擬合,并對比分析兩種典型地質(zhì)單元下地表總沉降的形成規(guī)律。3.根據(jù)實測資料,對隧道地表縱向沉降數(shù)據(jù)進行分析,研究南寧盆地隧道作業(yè)面穿越粉砂巖地區(qū)的縱向沉降滯后發(fā)展的規(guī)律。經(jīng)過上述研究主要結(jié)論有:考慮雙線疊加影響,南寧盆地隧道作業(yè)面穿圓礫層區(qū),地表橫斷面沉降曲線基本呈現(xiàn)單峰特征,穿粉砂巖區(qū),地表橫斷面沉降曲線基本呈現(xiàn)雙峰特征,利用考慮雙線影響下的Peck公式擬合效果良好,本文給出的這兩種作業(yè)面地質(zhì)條件下的地表橫向預測公式有實際研究意義;考慮雙線隧道開挖相互的疊加作用,在這兩種地質(zhì)條件下,對地表縱向沉降規(guī)律進行分析,發(fā)現(xiàn)地質(zhì)條件和相對水平系數(shù)都對該沉降有重要影響;施工中,地鐵兩隧道滯后修建的影響,Peck三維修正公式并不適用于南寧盆地穿圓礫層和粉砂巖層地質(zhì)單元條件下地鐵雙線施工引起的地表縱向沉降的預測。
[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.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455;P642.26

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