本文關(guān)鍵詞： 地鐵盾構(gòu) 土壓平衡 地表沉降 數(shù)值模擬　出處：《安徽理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,隨著世.界人口的快速增長,土地資源顯得越來越緊缺。在我國伴著城.市化進(jìn).程步伐的加快,土地資源也越來越寶貴。為了充分利用土地,人們加大建筑高度,產(chǎn)生了高層建筑和超高.層建筑；開發(fā)利用地下空間資源,產(chǎn)生了地下建筑,地鐵等等；地鐵的產(chǎn)生使得地面交通壓力得到了相當(dāng)大的緩解,修建地鐵通常使用的一種重要施工方法就是盾構(gòu)法,主要因?yàn)槎軜?gòu)法在地鐵隧.道施工過程中有著其他施工方法所不具備的獨(dú)特優(yōu)勢。另外盾構(gòu)法對土體性質(zhì)的要求也不是很高。然而事情的兩面性決定了盾構(gòu)法也有不足之處。由盾構(gòu)法施工引起的地表沉降和地層移動規(guī)律一直都是盾構(gòu)隧道設(shè)計(jì)以及施工過程中非常關(guān)心的問題。地鐵隧道施工之時(shí)和施工后期誘發(fā)的地表沉陷是致使建、構(gòu)筑物產(chǎn)生外觀及功能上損害的主要原因,每年因此而產(chǎn)生的經(jīng)濟(jì)損失非常大。所以,研究分析由地鐵隧道.盾構(gòu)施.工引起的地表沉降規(guī)律是十分迫切和必要的。 文章依托南京地鐵4號線東流站～青龍站區(qū)間隧道為工程背景,并且從該隧道區(qū)間選取其中一段土層特性建立三維數(shù)值模擬模型。分析模擬開挖對于地表沉降地影響。通過分析研究,得出了一些有一定參考價(jià)值的結(jié)論：盾構(gòu)不斷向前推進(jìn)的進(jìn)程中,地表沉降值也是在逐漸增大的,在隧道開挖面后方40米左右處趨于穩(wěn)定。開挖面前方15米處土體出現(xiàn)輕微隆起現(xiàn)象；依照施工順序,左線隧道先行開挖,之后再進(jìn)行右線開挖,由于左線開挖對周圍土體產(chǎn)生擾動,導(dǎo)致右線土體強(qiáng)度弱化,從而使得在右線隧道中心線處上方的地表沉降最大值稍微大于左線；距盾構(gòu)機(jī)刀盤前方15米處,地表出現(xiàn)向上的隆起現(xiàn)象,初期的沉降值大致為1-2mm,在開挖面的前方大致為-2～-3mm。盾構(gòu)通過時(shí)的沉降值大致為-5～-7mm。盾尾間隙的沉降值大致為-8--14mm,它主要取決于所處地層的自穩(wěn)能力；當(dāng)盾構(gòu)的外徑一樣時(shí),地表沉降隨著隧道上覆土層深度的增大呈現(xiàn)減小趨勢,然而,當(dāng)深度增大到一定的程度時(shí),地表沉降減小的幅度越來越�。蛔{及時(shí)與否對于地表沉降值的影響很大,由于注漿不及時(shí)引起的地表最大沉降量是注漿及時(shí)狀態(tài)下的最大沉降量的至少2倍以上。研究所得的地鐵盾構(gòu)施工地層沉降機(jī)理和規(guī)律可以為類似工程方案的確定和施工組織設(shè)計(jì),提供一定的參照價(jià)值。
[Abstract]:At present, with the rapid growth of population in the world, land resources are becoming more and more scarce. In our country, with the rapid pace of city and city development, land resources are becoming more and more valuable in order to make full use of land. People increase the height of buildings, resulting in high-rise buildings and super-high buildings; Development and utilization of underground space resources, resulting in underground buildings, subway and so on; The ground traffic pressure has been greatly alleviated by the generation of subway. The shield method is one of the most important construction methods used in subway construction. This is mainly due to the unique advantages of shield method in the construction of subway tunnel and tunnel. In addition, the requirement of shield method for soil properties is not very high. However, the dual character of shield method determines the shield method. The law of ground subsidence and stratum movement caused by shield tunneling is always a problem of great concern in the design and construction of shield tunnel. ground subsidence induced by subway tunnel construction and late construction. Trapping is the cause of construction. The main cause of damage to appearance and function of the structure is that the economic loss caused by it is very large every year. It is very urgent and necessary to study and analyze the law of ground subsidence caused by subway tunnel and shield tunneling. This paper relies on the engineering background of the tunnel between East Stream Station and Azure Dragon Station of Nanjing Metro Line 4. And from the tunnel interval selected one of the soil layer characteristics to establish a three-dimensional numerical simulation model, analysis of the impact of simulated excavation on the ground subsidence. Through analysis and research. Some conclusions with certain reference value are obtained: the ground subsidence value is increasing gradually in the process of shield machine moving forward. It tends to be stable at about 40 meters behind the excavating surface, and the soil appears slight bulge at 15 meters in front of the excavating surface. According to the construction sequence, the left tunnel is excavated first, and then the right line is excavated. Because of the disturbance of the surrounding soil caused by the left line excavation, the strength of the right line soil is weakened. Therefore, the maximum value of surface subsidence above the center line of the right line tunnel is slightly larger than that of the left line. There is an upward uplift on the surface 15 meters from the front of the cutter head of the shield machine, and the initial settlement value is about 1-2mm. At the front of the excavating surface, the settlement of the shield is about -2 ~ 3mm. the settlement value of the shield is about -5 ~ 7mm. the settlement of the clearance between the shield and the tail is about -8mm to 14mm. It mainly depends on the self-stability ability of the strata in which it is located. When the outer diameter of shield machine is the same, the surface settlement decreases with the increase of the depth of the overlying soil layer. However, when the depth increases to a certain extent, the extent of the decrease of the surface settlement becomes smaller and smaller. Whether the grouting is timely or not has a great influence on the surface settlement value. The maximum surface settlement caused by late grouting is at least 2 times of the maximum settlement under the condition of grouting. The mechanism and law of ground subsidence in shield tunneling construction can be proved to be similar engineering schemes. Fixed and construction organization design. Provide certain reference value.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43;U456.3

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