本文選題：聯(lián)絡(luò)通道　切入點：凍結(jié)施工　出處：《中國礦業(yè)大學》2014年碩士論文

【摘要】：本文以武漢市軌道交通4號線2期工程復(fù)興路站～攔江路站越江區(qū)間隧道1#聯(lián)絡(luò)通道凍結(jié)工程為背景，運用數(shù)值模擬和實測分析手段，深入研究越江隧道聯(lián)絡(luò)通道凍結(jié)法施工引起的土體凍脹以及施工過程對襯砌結(jié)構(gòu)受力變形造成的影響。主要的研究內(nèi)容和成果如下： 首先開展數(shù)據(jù)模擬研究。研究實際工況下的凍結(jié)溫度場發(fā)展規(guī)律，得出在凍結(jié)前期，，土體溫度呈直線下降，凍結(jié)后期，土體溫度平穩(wěn)下降；研究施工過程中各個工況下襯砌結(jié)構(gòu)受力變形規(guī)律，得出拉開鋼管片時，管片應(yīng)力明顯增大，管片受力狀態(tài)較為不利，工況三對左線隧道管片測點水平位移和豎向位移影響最為明顯，工況四對右線隧道管片測點水平位移和豎向位移影響最為明顯。 其次進行現(xiàn)場實測數(shù)據(jù)分析。分析了凍結(jié)施工中溫度場、凍脹壓力、襯砌結(jié)構(gòu)的變形規(guī)律，得出凍結(jié)初期，各測點溫度顯著下降，凍結(jié)后期，各測點溫度下降平緩；凍土帷幕交圈前，凍脹力緩慢增大，凍土帷幕開始交圈，土體中的凍脹力開始急劇增長；隧道沉降相對于聯(lián)絡(luò)通道開挖施工有滯后效應(yīng)，在通道開挖前，橫徑收斂逐漸縮小，通道開挖后，橫徑收斂開始逐漸增大，待永久襯砌構(gòu)筑完成后，橫徑收斂值趨于穩(wěn)定，靠近聯(lián)絡(luò)通道近的各測點在不同工況下沉降位移和橫徑收斂受到的影響較其它測點更顯著。 最后，通過數(shù)值模擬結(jié)果和現(xiàn)場實測結(jié)果的對比，綜合分析了凍結(jié)施工中凍結(jié)溫度場、襯砌結(jié)構(gòu)的受力與變形規(guī)律，得出了兩者變形規(guī)律是一致的。 本文的研究對越江隧道聯(lián)絡(luò)通道凍結(jié)的設(shè)計與施工以及襯砌結(jié)構(gòu)的設(shè)計具有重要的指導(dǎo)意義，對保證此類越江隧道聯(lián)絡(luò)通道凍結(jié)工程的安全具有重要的參考價值。
[Abstract]:In this paper , the influence of the frost heaving and the construction process on the stress deformation of the lining structure caused by the construction process of the crossing section tunnel of the crossing section of the crossing section of the crossing section of the crossing section of the No . 4 project of Wuhan Rail Transit Line 4 and the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the crossing section of the river crossing section of Wuhan City are studied . The main research contents and achievements are as follows :

Firstly , the data simulation research is carried out . The law of freezing temperature field in the actual working condition is studied , and the temperature of soil body decreases linearly in the early stage of freezing , and the temperature of soil body decreases steadily in the later stage .
The stress deformation law of the lining structure under each working condition during the course of construction is studied . It is concluded that the stress of the pipe piece is obviously increased when the steel pipe sheet is pulled apart , the stress state of the pipe piece is relatively unfavorable , the working condition is the most obvious influence on the horizontal displacement and vertical displacement of the measuring point of the left - line tunnel tube sheet , and the working condition four is the most obvious influence on the horizontal displacement and vertical displacement of the measuring point of the right - line tunnel segment .

Secondly , the field test data analysis is carried out . The deformation law of temperature field , frost heaving pressure and lining structure in freezing construction is analyzed , and it is concluded that the temperature of each measuring point decreases significantly during the initial freezing period .
The frost heaving force increases slowly before the frozen soil curtain crosses the circle , and the frost heaving force in the soil starts to grow rapidly after the frozen soil curtain starts to turn into the circle ;
The tunnel settlement has a lag effect relative to the excavation and construction of the connecting channel . Before the channel is excavated , the transverse diameter convergence gradually decreases , and after the passage is excavated , the transverse diameter convergence starts to increase gradually . After the construction of the permanent lining is completed , the transverse diameter convergence value tends to be stable , and the settlement displacement and the transverse diameter convergence of each measuring point close to the contact channel are affected more significantly under different working conditions .

Finally , through the comparison of numerical simulation results and field test results , the stress and deformation law of freezing temperature field and lining structure in frozen construction are analyzed , and the deformation law of the two is consistent .

The research of this paper has important guiding significance for the design and construction of the freezing of the contact channel of the crossing tunnel and the design of the lining structure , and has important reference value for ensuring the safety of the freezing project of the connecting channel of the river tunnel .

【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U459.5

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