發(fā)布時間：2018-04-14 18:52

  本文選題：發(fā)散布孔 + 溫度場��； 參考：《中國礦業(yè)大學(xué)》2014年碩士論文

【摘要】：廣佛線普君北路站～朝安站區(qū)間隧道管片處理凍結(jié)封水工程于隧道底部布置了發(fā)散的凍結(jié)管來進(jìn)行堵水。為了獲得凍結(jié)管發(fā)散布置條件下的凍結(jié)溫度場分布及其發(fā)展規(guī)律，本文采用數(shù)值模擬和模型試驗(yàn)相結(jié)合的方法進(jìn)行研究分析。 建立Ansys數(shù)值模擬模型，進(jìn)行單因素、正交分析以及多因素回歸分析研究不同因素對發(fā)散布孔條件下凍結(jié)溫度場的影響規(guī)律，并獲得回歸公式。通過單因素分析，，得到凍結(jié)壁厚度隨著初始地溫和相鄰凍結(jié)管夾角的增大而減小、隨著相鄰凍結(jié)管排間距的增大而增大以及隨著凍結(jié)管外壁溫度的降低而增大等規(guī)律，而土體凍結(jié)溫度對溫度場影響不明顯；凍結(jié)壁平均溫度則呈現(xiàn)與凍結(jié)壁厚度相反的變化規(guī)律，其中，排間距對凍結(jié)壁平均溫度的影響表現(xiàn)為先降低后升高；文章通過安排正交試驗(yàn)，得到了發(fā)散布孔條件下凍結(jié)溫度場的顯著性影響因素。其中，凍結(jié)壁厚度的顯著性影響因素為凍結(jié)管外壁溫度以及相鄰凍結(jié)管的夾角。凍結(jié)壁平均溫度的顯著性影響因素為凍結(jié)管外壁溫度、相鄰凍結(jié)管夾角以及相鄰凍結(jié)管排間距；而后，安排正交表利用數(shù)值模擬進(jìn)行了多因素回歸試驗(yàn)，通過計(jì)算結(jié)果分別得出凍結(jié)壁厚度、平均溫度以及凍結(jié)壁軸面上環(huán)向發(fā)展寬度等目標(biāo)量的多因素回歸公式。 通過物理模擬實(shí)驗(yàn)，研究了相鄰凍結(jié)管夾角為10o和14o兩個模型的凍結(jié)溫度場，分析各特征面測點(diǎn)溫度的變化情況以及特征面上的溫度分布規(guī)律，并對比不同凍結(jié)管夾角的模型溫度場分布的異同。通過模型試驗(yàn)得出，凍結(jié)初期，界面凍結(jié)溫度場的發(fā)展要小于主面，在凍結(jié)后期，二者達(dá)到相近水平；增大凍結(jié)管間的夾角，將使凍結(jié)壁厚度降低，平均溫度升高，凍結(jié)壁的環(huán)向凍結(jié)范圍增大。文章通過對凍結(jié)壁厚度、平均溫度以及凍結(jié)壁環(huán)向發(fā)展寬度隨時間的變化曲線進(jìn)行擬合，得出擬合公式，并進(jìn)行求導(dǎo)，得出發(fā)散布孔條件下凍結(jié)溫度場的發(fā)展速度公式。 將數(shù)值模擬的計(jì)算結(jié)果與模型實(shí)驗(yàn)的結(jié)果進(jìn)行比較，得出二者所得的溫度場分布規(guī)律一致，但實(shí)驗(yàn)測值要小于數(shù)值模擬的數(shù)值，且在凍結(jié)管區(qū)域，數(shù)值模擬更能細(xì)致地反映出溫度場的分布規(guī)律。 綜上所述，發(fā)散布孔條件下，各因素對其溫度場具有不同程度的影響，其中凍結(jié)管外壁溫度、相鄰凍結(jié)管夾角以及凍結(jié)管排間距影響較為顯著。在實(shí)驗(yàn)條件下，應(yīng)嚴(yán)格控制實(shí)驗(yàn)過程，避免實(shí)驗(yàn)誤差，并結(jié)合數(shù)值模擬分析凍結(jié)管附近區(qū)域的凍結(jié)溫度場分布規(guī)律。本文通過多因素回歸分析以及實(shí)驗(yàn)數(shù)據(jù)擬合得到的凍結(jié)壁厚度、平均溫度及其發(fā)展速度公式，對相關(guān)工程有一定的參考指導(dǎo)作用。
[Abstract]:In order to obtain the frozen temperature field distribution and its development law under the condition of divergent placement of frozen pipe , the numerical simulation and model test are used to study the freezing temperature field distribution and its development law .

An Ansys numerical simulation model is established , and the influence law of different factors on freezing temperature field under the condition of distribution holes is studied by single factor , orthogonal analysis and multi - factor regression analysis .
The average temperature of the frozen wall is the opposite of the thickness of the frozen wall , where the influence of the row spacing on the average temperature of the frozen wall is decreased firstly and then raised ;
In this paper , the influence factors of freezing temperature field were obtained by arranging orthogonal test . Among them , the influence factors of freezing wall thickness were freezing tube outer wall temperature and the included angle of adjacent freezing tube . The significant influence factors of freezing wall ' s average temperature were freezing tube outer wall temperature , adjacent freezing tube included angle and adjacent freezing tube row spacing ;
Then , the orthogonal table is arranged to use the numerical simulation to carry out the multi - factor regression test , and the multi - factor regression formula of the target quantity such as the thickness of the frozen wall , the average temperature and the circumferential development width of the frozen wall axis is obtained through the calculation results .

Through the physical simulation experiment , the freezing temperature field of the two models with the included angle of 10o and 14o of the adjacent freezing tube is studied , the temperature distribution law of each characteristic surface temperature measuring point is analyzed , and the variation of the temperature distribution of the model of the included angle of the freezing tube is compared .
By increasing the angle between freezing tubes , the thickness of frozen wall is decreased , the average temperature is raised , and the freezing range of frozen wall is increased . By fitting the frozen wall thickness , the average temperature and the curve of frozen wall to the development width with time , the fitting formula is obtained .

The results of the numerical simulation are compared with the results of the model experiment , and the distribution law of the temperature field obtained by the numerical simulation is consistent , but the experimental values are smaller than those of the numerical simulation , and the numerical simulation can accurately reflect the distribution law of the temperature field in the freezing tube area .

In conclusion , the influence of various factors on the temperature field of the frozen pipe under the condition of distributing holes is significant . Under the experimental conditions , the experimental process should be strictly controlled to avoid the experimental error , and the distribution law of freezing temperature field in the area near the freezing tube should be analyzed by numerical simulation .

【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451

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