本文關(guān)鍵詞： 基坑支護(hù) 復(fù)合土釘墻 預(yù)應(yīng)力錨索 土壓力 數(shù)值模擬　出處：《東華理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在科學(xué)技術(shù)日益發(fā)展的今天,隨著各種高層建筑的地下室和地鐵的建設(shè),深基坑支護(hù)工程也將會越來越多,就目前而言,深基坑的支護(hù)形式很多,按照其結(jié)構(gòu)受力的情況特點可以分為樁墻聯(lián)合支護(hù)結(jié)構(gòu),土釘墻結(jié)構(gòu),重力式擋墻結(jié)構(gòu),拱墻結(jié)構(gòu)等幾種類型,在實際工程中,土釘墻支護(hù)結(jié)構(gòu)應(yīng)用最廣,但卻存在很多問題,例如在一些變形控制比較嚴(yán)格的場地中變形超過允許值,因此,土釘墻支護(hù)結(jié)構(gòu)往往和灌注樁、微型樁、預(yù)應(yīng)力錨桿(錨索)等一些結(jié)構(gòu)聯(lián)合使用,然而目前的設(shè)計計算理論卻并不完善、對一些重要性的問題例如現(xiàn)有的土壓力計算理論和實際情況的比較,支護(hù)結(jié)構(gòu)的內(nèi)力變化等問題并沒有很好的闡述,本文主要就以預(yù)應(yīng)力錨索型復(fù)合土釘墻和傳統(tǒng)土釘墻的實際工程應(yīng)用效果作出定量分析,并結(jié)合實際工程,進(jìn)行數(shù)值模擬計算,對支護(hù)效果進(jìn)行相應(yīng)的評價。本文的主要內(nèi)容有:首先討論土釘墻的支護(hù)形式,發(fā)展概況和應(yīng)用情況以及目前的國內(nèi)外土釘支護(hù)結(jié)構(gòu)的發(fā)展情況和研究情況,并提出土釘支護(hù)中所存在的一些問題,如實際施工過程中土壓力的分布情況,現(xiàn)有的土壓力計算理論是否符合實際情況,并對各種土壓力計算方法進(jìn)行比較分析,確定一種比較適用的計算理論。其次,在上文討論的基礎(chǔ)上分別對傳統(tǒng)土釘墻以及預(yù)應(yīng)力錨索型復(fù)合土釘墻的設(shè)計方法以及工作機(jī)理進(jìn)行介紹,并對影響復(fù)合土釘墻穩(wěn)定性的因素進(jìn)行分析,提出相應(yīng)的計算方法。然后,根據(jù)實際工程情況,對預(yù)應(yīng)力錨索復(fù)合土釘墻的應(yīng)用效果從如下幾個方面進(jìn)行評價、如土釘應(yīng)力的變化,在預(yù)應(yīng)力錨索作用下土釘應(yīng)力的變化,復(fù)合土釘墻的水平和垂直位移的變化情況,并對實際土壓力、新土壓力公式、傳統(tǒng)計算公式的結(jié)果進(jìn)行對比、并結(jié)合數(shù)值模擬的結(jié)果來綜合反映預(yù)應(yīng)力錨索復(fù)合土釘墻在基坑工程中應(yīng)用效果。最后對全文進(jìn)行總結(jié),提出研究成果,提出不足之處并對復(fù)合土釘墻技術(shù)提出展望。
[Abstract]:With the development of science and technology, with the construction of basement and subway of various high-rise buildings, the support works of deep foundation pit will be more and more. At present, there are a lot of support forms of deep foundation pit. According to the characteristics of the structure, it can be divided into pile wall combined support structure, soil nail wall structure, gravity retaining wall structure, arch wall structure and other types. In actual engineering, soil nail wall support structure is the most widely used. However, there are many problems, for example, in some places where deformation control is more strict than the allowable value, therefore, the soil nailing wall support structure and cast-in-place pile, micro-pile. Some structures such as prestressed anchors (anchor cables) are used together, however, the current design and calculation theory is not perfect, and some important problems such as the existing theory of earth pressure calculation and the actual situation are compared. The change of internal force of supporting structure is not well elaborated. This paper mainly makes quantitative analysis on the actual engineering application effect of prestressed anchor cable composite soil nailing wall and traditional soil nailing wall, and combines with actual engineering. The main contents of this paper are as follows: firstly, the support form of soil nailing wall is discussed. The development and application of soil nailing support structure at home and abroad are reviewed. Some problems existing in soil nailing support are put forward, such as the distribution of earth pressure in actual construction process. The existing earth pressure calculation theory is in line with the actual situation, and a variety of earth pressure calculation methods are compared and analyzed to determine a more suitable calculation theory. Secondly. Based on the discussion above, the design method and working mechanism of traditional soil nailing wall and prestressed anchor cable composite soil nailing wall are introduced, and the factors influencing the stability of composite soil nailing wall are analyzed. Then, according to the actual engineering situation, the application effect of prestressed anchor cable composite soil nailing wall is evaluated from the following aspects, such as the change of soil nailing stress. Under the action of prestressed anchor cable, the change of soil nailing stress and the change of horizontal and vertical displacement of composite soil nailing wall are compared, and the results of actual earth pressure, new earth pressure formula and traditional calculation formula are compared. Combined with the results of numerical simulation to reflect the application effect of prestressed anchor cable composite soil nailing wall in foundation pit engineering. Finally the full text is summarized and the research results are put forward. The inadequacies and the prospect of composite soil nailing wall technology are put forward.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU476

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