本文關(guān)鍵詞：凍結(jié)降溫對(duì)地鐵盾構(gòu)隧道接縫影響的數(shù)值研究　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地鐵 盾構(gòu)隧道 凍結(jié)降溫 滲漏水 管片接縫 數(shù)值模擬

【摘要】：隨著地鐵沿線周邊物業(yè)高強(qiáng)度、高密度的開發(fā),在地鐵隧道正上方進(jìn)行的基坑工程日益增多。在隔水地層條件下,地鐵隧道正上方基坑工程已成功的案例較多,但針對(duì)強(qiáng)透水地層條件下,由于受下方隧道埋深及基坑止水帷幕無(wú)法超越隧道等條件的限制,基坑工程往往難以按常規(guī)的止水方法形成封閉的隔水體系,將可能影響甚至危及基坑工程的自身安全以及下方地鐵隧道的結(jié)構(gòu)安全和地鐵的運(yùn)營(yíng)安全。對(duì)基坑兩端圍護(hù)結(jié)構(gòu)和止水帷幕無(wú)法插入隔水地層的部位,采用凍結(jié)法實(shí)施凍結(jié)降溫以形成封閉的隔水體系,可有效解決此類特殊基坑工程的止水問(wèn)題,并對(duì)下方地鐵隧道結(jié)構(gòu)安全進(jìn)行保護(hù)。受局部?jī)鼋Y(jié)降溫的影響,下方地鐵盾構(gòu)隧道的力學(xué)行為將發(fā)生改變,如盾構(gòu)隧道接縫張開量增大,進(jìn)而可能誘發(fā)隧道滲漏水。然而,目前針對(duì)此類基坑工程凍結(jié)降溫對(duì)地鐵盾構(gòu)隧道接縫影響所開展的相關(guān)研究甚少。本文以某凍結(jié)法止水基坑工程下方運(yùn)營(yíng)地鐵盾構(gòu)隧道為研究對(duì)象,采用Midas FEA有限元軟件,建立了地鐵盾構(gòu)隧道的三維精細(xì)數(shù)值模型,研究了凍結(jié)降溫作用對(duì)盾構(gòu)隧道環(huán)縫、縱縫張開量及管片受力、變形等的影響,并初步分析了依托工程隧道滲漏水的原因。本文的主要工作和研究成果如下:(1)結(jié)合盾構(gòu)隧道管片通過(guò)環(huán)向螺栓和縱向螺栓連接這一結(jié)構(gòu)特點(diǎn),建立了橫向單環(huán)和縱向三環(huán)盾構(gòu)隧道的三維精細(xì)數(shù)值模型,考慮了管片接縫、連接螺栓、手孔、橡膠密封墊等細(xì)部構(gòu)造。(2)研究了四種不同凍結(jié)范圍情況下,單環(huán)管片的溫度場(chǎng)分布、縱縫張開量及單環(huán)管片的受力和變形受凍結(jié)降溫影響的變化規(guī)律。對(duì)比分析了在溫度工況、荷載-溫度工況下,縱縫張開量以及單環(huán)管片的受力和變形受對(duì)流系數(shù)、最低凍結(jié)溫度兩種因素影響的變化規(guī)律。(3)研究了不同凍結(jié)范圍情況下,環(huán)縫張開量及縱向三環(huán)管片的受力和變形受凍結(jié)降溫影響的變化規(guī)律。分析了在溫度工況下,環(huán)縫張開量以及縱向三環(huán)管片的受力和變形受對(duì)流系數(shù)、最低凍結(jié)溫度兩種因素影響的變化規(guī)律。(4)結(jié)合依托工程盾構(gòu)隧道滲漏水案例,通過(guò)對(duì)比分析凍結(jié)降溫作用下隧道的環(huán)縫、縱縫張開量,初步分析了隧道發(fā)生滲漏水的原因。
[Abstract]:Along with the MTR surrounding property of high strength, high density development, foundation pit engineering is above the subway tunnel is increasing. In the water formation condition, more cases are above the subway tunnel excavation project has been successful, but the strong permeable stratum conditions, due to tunnel buried depth and foundation pit waterproof curtain beyond tunnel conditions, excavation engineering is often difficult to stop according to conventional methods to form a closed water system, the structural safety and possible effects of iron and even endanger the safety and excavation of subway tunnel under the operation safety of foundation pit retaining structure. Both ends and waterproof curtain cannot be inserted into the water formation sites by freezing the implementation of the law of freezing temperature to form a closed water system, can effectively solve the water problem of this kind of special foundation pit, and the bottom of the subway tunnel construction safety. For protection. By partial freezing cooling effect, the mechanical behavior under the subway shield tunnel will be changed, such as the joint open shield tunnel increases, which may induce tunnel Water Leakage. However, at present this kind of foundation pit engineering research related to the freezing temperature for the metro shield tunnel joint influence carried out by little. Based on a freezing method water pit below the metro shield tunnel as the research object, using Midas finite element software FEA, 3D numerical model was established for the subway shield tunnel, the effect of freezing cooling effect of shield tunnel joints, longitudinal seam open and segment stress, deformation and so on, and analyzed the cause of tunnel project Water Leakage. The main work and research results are as follows: (1) combined with the shield tunnel segment by bolt and bolt connecting the vertical structure characteristics, establish the horizontal 3D numerical model of the single ring and vertical ring of shield tunnel, the segment joint, bolts, hand hole, rubber gaskets and other details. (2) studied four different freezing range, the temperature field distribution of single segment, longitudinal crack of single loop and the force effect of cooling and deformation by freezing. The variation regularity of comparative analysis on temperature, load and temperature conditions, and the opening of the longitudinal joints of single segment stress and deformation by the convection coefficient, variation of the minimum effect of freezing temperature two factors. (3) studied the different freezing range under the condition of ring seam open and longitudinal ring segment stress and deformation by the freezing effect of cooling were studied. Analysis of the temperature conditions, circular seam stretching and longitudinal ring segment stress and deformation by the convection coefficient, minimum freezing temperature two because of changes in the factors. (4) combined with the case of water leakage in the engineering shield tunnel, by comparing and analyzing the circumferential seam and longitudinal opening quantity of the tunnel under freezing and lowering temperature, the cause of water leakage in the tunnel is preliminarily analyzed.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.43;U231.3

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 潘軍;芳綸纖維布加固地鐵盾構(gòu)隧道承載性能數(shù)值研究[D];華南理工大學(xué);2016年

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本文編號(hào)：1414063