【摘要】：當前合肥正處在高速發(fā)展的狀態(tài),城市規(guī)模不斷擴大,原有的地面交通已經(jīng)不能滿足日益擁堵的城市交通,地鐵的建設可以有效的解決城市交通問題。同時城市地面建筑的發(fā)展也相當迅速,這就涉及到在地鐵隧道上方施工的基坑開挖工程。上部的基坑開挖會影響下部地鐵隧道結(jié)構(gòu)的穩(wěn)定性。因此基坑開挖對下部既有隧道變形機理的研究具有重要的意義。本文以合肥高鐵南站南廣場工程為背景,采用有限元軟件MIDAS/GTS進行數(shù)值模擬的方法,分析比較基坑不同開挖方式對下部既有隧道變形的影響,整理分析監(jiān)測數(shù)據(jù),并將模擬值與監(jiān)測數(shù)據(jù)比較,探討基坑開挖對下部既有隧道縱向變形的影響,主要工作和結(jié)論如下:1.對國內(nèi)外關(guān)于基坑開挖對下部既有隧道變形的研究進行了總結(jié),得出了地鐵隧道的相關(guān)變形規(guī)律,提出了本文的研究方法。2.研究基坑開挖對下部既有隧道變形的影響,總結(jié)了土壓力的計算方法,基坑開挖的時空效應,隧道隆起值的計算方法。得出了基坑開挖對下部既有隧道變形的影響規(guī)律,提出了合理的開挖方式。3.根據(jù)實際的施工方案,選取合適的本構(gòu)模型,采用有限元軟件MIDAS/GTS分別對不同的施工方案進行數(shù)值模擬。分析比較不同施工方案的隧道變形的結(jié)果,研究基坑開挖對下部隧道拱頂隆起變形的規(guī)律,選取合理的開挖方式。通過分析模擬結(jié)果可以看出,基坑開挖會引起下部地鐵隧道的縱向變形,隧道拱頂呈現(xiàn)隆起的趨勢。拱頂隆起變形呈現(xiàn)兩邊小,中間大的弓形。方案三的模擬值要小于方案二的模擬值,因此方案三的開挖方式更有利于控制隧道的縱向變形。4.分析整理監(jiān)測數(shù)據(jù),并且與數(shù)值模擬的數(shù)據(jù)進行對比分析,驗證了模型的合理性。根據(jù)數(shù)據(jù)分析基坑開挖對下部既有隧道的變形的影響。基坑開挖對下部既有地鐵隧道縱向變形的影響與距離有關(guān),隧道距離開挖土體越近,隧道拱頂?shù)目v向變形越大,反之越小。
[Abstract]:At present, Hefei is in a state of rapid development, the scale of the city continues to expand, the original ground traffic can no longer meet the increasing congestion of urban traffic, subway construction can effectively solve the urban traffic problems. At the same time, the development of urban ground building is very rapid, which involves excavation of foundation pit over subway tunnel. The excavation of the upper excavation will affect the stability of the lower subway tunnel structure. Therefore, the excavation of foundation pit is of great significance to the study of deformation mechanism of the existing tunnel in the lower part. Based on the South Square Project of Hefei South Railway Station, this paper analyzes and compares the influence of different excavation methods on the deformation of the existing tunnel in the lower part of the foundation pit by using the finite element software MIDAS/GTS to carry out numerical simulation, and collates and analyzes the monitoring data. The effects of excavation on the longitudinal deformation of the existing tunnel in the lower part of the tunnel are discussed by comparing the simulated values with the monitoring data. The main work and conclusions are as follows: 1. This paper summarizes the research on the deformation of the existing tunnel in the lower part of the foundation pit excavation at home and abroad, obtains the relevant deformation law of the subway tunnel, and puts forward the research method of this paper. The influence of foundation pit excavation on the deformation of the existing tunnel is studied. The calculation method of earth pressure, the space-time effect of foundation pit excavation and the calculation method of tunnel uplift are summarized. The influence law of foundation pit excavation on the deformation of the existing tunnel in the lower part is obtained, and the reasonable excavation method is put forward. According to the actual construction scheme, the appropriate constitutive model is selected, and the numerical simulation of different construction schemes is carried out by using the finite element software MIDAS/GTS. This paper analyzes and compares the results of tunnel deformation with different construction schemes, studies the regularity of excavation deformation to the arch top of the lower tunnel, and selects a reasonable excavation method. Through the analysis of the simulation results, it can be seen that the excavation of foundation pit will cause longitudinal deformation of the lower subway tunnel, and the vault of the tunnel will show a tendency of uplift. The dome is shaped like a small arch in the middle. The simulation value of scheme 3 is smaller than that of scheme 2, so the excavation mode of scheme 3 is more favorable to control the longitudinal deformation of tunnel. 4. The rationality of the model is verified by comparing the monitoring data with the numerical simulation data. According to the data, the influence of excavation on the deformation of the existing tunnel in the lower part is analyzed. The influence of foundation pit excavation on the longitudinal deformation of the existing subway tunnel is related to the distance. The closer the tunnel is to the excavation soil, the greater the longitudinal deformation of the tunnel vault is, and the less the vertical deformation is.
【學位授予單位】：安徽建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U456.3

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