本文選題：雙側(cè)壁導(dǎo)坑法　切入點(diǎn)：開挖步序　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國(guó)國(guó)民經(jīng)濟(jì)的不斷發(fā)展,城市化進(jìn)程不斷加快,城市人口和城市中的機(jī)動(dòng)車輛越來越多,無形中給地面交通增加了很大壓力。由于現(xiàn)代化城市要向高效率和集約化方向發(fā)展,城市總體規(guī)劃要在一定空間范圍內(nèi),因而城市地上空間的利用率越來越高,為了城市更好的發(fā)展,人們開始利用城市的地下空間,特別是像蘭州這樣處在群山環(huán)抱中的城市,由于地上空間有限,因而未來開發(fā)利用地下空間是一種趨勢(shì)。開發(fā)城市的地下空間,比如修建地鐵,開挖地下隧道或者修建地下停車場(chǎng),修建地下商場(chǎng)等等,無疑會(huì)對(duì)地上建筑造成影響。本論文依托蘭州市白塔山隧道下穿古建筑群這一工程,利用理論和Flac3D數(shù)值分析兩種方法,研究了隧道開挖和地表建筑之間的相互影響。主要的研究?jī)?nèi)容和成果為:1采用有限元差分軟件Flac3D研究了雙側(cè)壁導(dǎo)坑法適用于本工程的開挖步序,為了更好的控制地表沉降,開挖雙線隧道時(shí),優(yōu)先開挖深埋側(cè)隧道,并優(yōu)先開挖淺埋側(cè)導(dǎo)洞。2通過有限元差分軟件Flac3D研究了隧道開挖時(shí)的地表沉降,從中總結(jié)出雙側(cè)壁導(dǎo)坑法施工時(shí)隧道沉降規(guī)律:開挖中導(dǎo)洞時(shí)引起的拱頂沉降最大,能占到拱頂沉降的30%到40%;隧道的拱頂沉降深埋側(cè)要大于淺埋側(cè);水平收斂淺埋側(cè)要大于深埋側(cè)。3總結(jié)了前人對(duì)Peck公式的研究成果,對(duì)Peck公式中主要的兩個(gè)參數(shù)采用下列方法計(jì)算:沉降槽寬度系數(shù)i通過前人總結(jié)的三種不同公式求平均值得到;地層損失通過經(jīng)驗(yàn)總結(jié)得到,本文選取偏保守的1%和3%作為最小和最大地層損失率求出地層損失的一個(gè)范圍。隨后利用Peck公式計(jì)算了隧道關(guān)鍵點(diǎn)處的沉降范圍,作為后續(xù)研究的一個(gè)理論參考范圍。同時(shí),還利用數(shù)值模擬的方法驗(yàn)證了Peck公式的合理性。4在Peck公式計(jì)算所得理論值的基礎(chǔ)上,結(jié)合數(shù)值模擬方法研究了隧道開挖和地表建筑的相互影響,發(fā)現(xiàn)地表建筑對(duì)隧道沉降影響很小,但隧道開挖會(huì)引起某些位置建筑的不均勻沉降。5研究了控制隧道沉降的一些因素,通過選擇恰當(dāng)?shù)拈_挖步序,及時(shí)支護(hù),選擇合適的支護(hù)方式以及支護(hù)參數(shù)能有效控制地表沉降。
[Abstract]:With the development of our national economy and the accelerating process of urbanization, there are more and more urban population and motor vehicles in cities. As a result of the development of modern cities towards high efficiency and intensive development, the overall urban planning should be within a certain space range, so the utilization rate of urban land space is becoming higher and higher. For the better development of the city, people began to make use of the underground space of the city, especially the city such as Lanzhou, which is surrounded by mountains, because of the limited space on the ground. Therefore, the future development and utilization of underground space is a trend. Underground space in developing cities, such as the construction of subways, excavation of underground tunnels or underground parking lots, construction of underground shopping malls, and so on. There is no doubt that the above ground building will be affected. Based on the project of Baitashan Tunnel in Lanzhou City, this paper makes use of two methods: theory and Flac3D numerical analysis. This paper studies the interaction between tunnel excavation and surface building. The main research contents and results are as follows: 1. Using finite element difference software Flac3D, the two-side wall guide pit method is applied to the excavation sequence of the project, in order to better control the surface settlement, In the excavation of double-line tunnel, priority is given to excavation of deep buried side tunnel, and preferential excavation of shallow buried side tunnel .2 through finite element difference software Flac3D to study the surface settlement during tunnel excavation. This paper summarizes the settlement law of the tunnel in the construction of double-side wall guide pit method: the settlement of arch roof caused by excavation is the largest, which can account for 30% to 40 percent of the settlement of arch roof, the deep buried side of tunnel dome settlement is larger than that of shallow buried side; The horizontal convergence of shallow buried side is greater than that of deep buried side. 3. The results of previous researches on Peck formula are summarized. The two main parameters of the Peck formula are calculated by the following methods: the width coefficient of the settlement trough I is obtained by the average value of three different formulas summarized by the predecessors, the formation loss is obtained by the experience summary, In this paper, the conservative values of 1% and 3% are selected as a range of minimum and maximum formation loss rates. Then the settlement range at the key points of the tunnel is calculated by using Peck formula, which is used as a theoretical reference range for further study. The rationality of Peck formula is verified by numerical simulation. 4 based on the theoretical value calculated by Peck formula, the interaction between tunnel excavation and surface building is studied in combination with numerical simulation method. It is found that the surface building has little influence on the tunnel settlement, but the uneven settlement of the building caused by the excavation of the tunnel will cause some factors to control the settlement of the tunnel. The surface subsidence can be effectively controlled by selecting appropriate supporting methods and supporting parameters.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455;TU433

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本文編號(hào)：1641605