發(fā)布時(shí)間：2018-07-10 15:09

  本文選題：地鐵施工 + 盾構(gòu)　； 參考：《武漢理工大學(xué)》2015年碩士論文

【摘要】：城市人口密度的增加對(duì)公共交通的發(fā)展提出了更高要求,地鐵由于安全、高效和環(huán)保而被廣泛應(yīng)用。我國(guó)正處于城市化建設(shè)高速發(fā)展階段,許多城市都積極進(jìn)行地鐵修建。然而地鐵線路規(guī)劃需綜合考慮地上、地下各方面因素,故地鐵線路在鋪設(shè)時(shí)無可避免地會(huì)下穿現(xiàn)有建筑,而地鐵施工引起的地層沉降必將對(duì)地表建筑產(chǎn)生一定的影響。故在施工前期需對(duì)這些結(jié)構(gòu)的安全性能進(jìn)行預(yù)評(píng)估,判斷地鐵施工引起的地層沉降是否會(huì)影響臨近結(jié)構(gòu)的正常使用和結(jié)構(gòu)安全。基于大量工程經(jīng)驗(yàn),目前我國(guó)普遍規(guī)定地鐵施工引起的地層沉降不超過3cm。但由于各地地質(zhì)條件、結(jié)構(gòu)形式、隧道半徑和埋深等方面的差異,該規(guī)定值的實(shí)用性面臨很大的爭(zhēng)議:對(duì)施工環(huán)境地質(zhì)條件較好,且周邊建筑基礎(chǔ)埋深較深的施工工況而言,該值可能過于嚴(yán)格,從而增大施工難度;但對(duì)于施工環(huán)境地質(zhì)條件較差,且周邊建筑為歷史建筑的施工工況而言,該值可能并不能保證結(jié)構(gòu)的安全。由此可見,要確定地鐵施工引起的地層沉降對(duì)周邊結(jié)構(gòu)的影響限值,應(yīng)當(dāng)針對(duì)不同的地質(zhì)條件、建筑結(jié)構(gòu)形式及基礎(chǔ)形式等進(jìn)行具體研究。本文以某九層框架結(jié)構(gòu)為研究對(duì)象,分別采用整體有限元方法和基于Peck公式的簡(jiǎn)化方法,研究地鐵施工引起的地層沉降對(duì)結(jié)構(gòu)受力和變形的影響。具體研究工作包括:1)總結(jié)歸納目前地鐵施工引起地層沉降的預(yù)測(cè)方法,并采用Peck經(jīng)驗(yàn)公式給出了北京、上海、廣州三地的地層沉降預(yù)測(cè)模型。研究了隧道埋深、地質(zhì)條件及沉降槽寬度等關(guān)鍵參數(shù)變化對(duì)沉降曲線的影響。2)建立隧道-土層-框架結(jié)構(gòu)整體有限元模型,采用單元生死的方法模擬盾構(gòu)施工過程,分析結(jié)構(gòu)的受力和變形特征。3)基于上述Peck公式確定的不同關(guān)鍵參數(shù)下的沉降曲線,將其作為外荷載在某九層框架結(jié)構(gòu)基礎(chǔ)底部輸入,分析結(jié)構(gòu)的受力和變形特征。4)基于受力分析的結(jié)構(gòu)安全性評(píng)價(jià),選取結(jié)構(gòu)柱的開裂荷載為結(jié)構(gòu)安全性評(píng)判指標(biāo),討論不同基礎(chǔ)形式、隧道與結(jié)構(gòu)相對(duì)位置、隧道埋深等不同沉降曲線下結(jié)構(gòu)的安全性。5)在基于變形的結(jié)構(gòu)安全性評(píng)價(jià),系統(tǒng)總結(jié)目前國(guó)內(nèi)外對(duì)地鐵施工引起沉降的評(píng)估指標(biāo)和評(píng)價(jià)方法,并在歸納總結(jié)的基礎(chǔ)上選用我國(guó)規(guī)范的相關(guān)指標(biāo)作為評(píng)價(jià)指標(biāo),對(duì)該九層框架在不同沉降值下的安全性能進(jìn)行了評(píng)估。研究結(jié)果表明:采用整體有限元法和簡(jiǎn)化的Peck公式法均可分析地鐵施工引起的地層變形對(duì)結(jié)構(gòu)的影響,但顯然簡(jiǎn)化公式法更為簡(jiǎn)單、實(shí)用;基于結(jié)構(gòu)受力和變形兩方面的評(píng)價(jià)指標(biāo)得到的評(píng)價(jià)結(jié)果是相同的,即表明二者的統(tǒng)一性。
[Abstract]:The increase of urban population density puts forward higher requirements for the development of public transport. Subway is widely used because of its safety, efficiency and environmental protection. Our country is in the urbanization construction high-speed development stage, many cities are carrying on the subway construction positively. However, it is necessary to take all factors above ground and underground into consideration in subway line planning, so it is inevitable that subway line will go through the existing building when laying, and the ground settlement caused by subway construction will have certain influence on the surface building. Therefore, it is necessary to pre-evaluate the safety performance of these structures in the early stage of construction to determine whether the ground settlement caused by subway construction will affect the normal use of adjacent structures and structural safety. Based on a large amount of engineering experience, it is generally stipulated that the ground settlement caused by subway construction in China is not more than 3 cm at present. However, due to the differences in geological conditions, structural forms, tunnel radius and burial depth in various places, the practicability of the specified values faces great controversy: for the construction conditions where the geological conditions of the construction environment are good, and the foundation of the surrounding buildings is buried deeper, This value may be too strict to make the construction more difficult, but it may not guarantee the safety of the structure when the construction environment and geological conditions are poor, and the surrounding building is the construction condition of the historical building. It can be seen that in order to determine the limit value of the influence of ground subsidence caused by subway construction on the surrounding structure, it is necessary to study the different geological conditions, the form of building structure and the form of foundation, etc. In this paper, a nine-story frame structure is taken as the research object, and the global finite element method and the simplified method based on Peck formula are used to study the influence of ground settlement caused by subway construction on the stress and deformation of the structure. The concrete research work includes: 1) summing up and summing up the prediction methods of ground subsidence caused by subway construction at present, and using Peck empirical formula to give the prediction models of ground subsidence in Beijing, Shanghai and Guangzhou. The influence of the key parameters such as depth of tunnel, geological condition and width of settlement trough on settlement curve is studied. 2) the integral finite element model of tunnel-soil-frame structure is established, and the method of element birth and death is used to simulate the construction process of shield tunneling. Based on the settlement curves of different key parameters determined by the Peck formula above, the settlement curves are input as external loads at the base of a nine-story frame structure. Based on the structural safety evaluation of the stress analysis, the cracking load of the structural column is selected as the structural safety evaluation index, and the different foundation forms, the relative position of the tunnel and the structure are discussed. Safety evaluation of structures under different settlement curves, such as tunnel depth, is based on deformation-based structural safety evaluation. The evaluation indexes and methods of settlement caused by subway construction at home and abroad are systematically summarized. On the basis of summing up and summarizing, the safety performance of the nine-story frame under different settlement values is evaluated by selecting the relevant indexes of the code of our country as the evaluation index. The results show that the whole finite element method and the simplified Peck formula method can be used to analyze the influence of formation deformation caused by subway construction on the structure, but it is obvious that the simplified formula method is simpler and more practical. The evaluation results based on the structural stress and deformation are the same, that is to say, the unity of the two.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U231.3;U455.43;TU433

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