【摘要】：隨著城市交通隧道的不斷發(fā)展,越來越多的水下交通隧道工程正在開展,我國沿海地區(qū)處于環(huán)太平洋地震帶,水下交通隧道不可避免的會穿越這些地區(qū),水下盾構(gòu)隧道受到復(fù)雜地質(zhì)環(huán)境、高水壓、侵蝕環(huán)境等因素的影響,隧道結(jié)構(gòu)在侵蝕環(huán)境中發(fā)生劣化后的抗震性能更是無法估計,因此,侵蝕環(huán)境和地震荷載共同影響下的隧道結(jié)構(gòu)安全和穩(wěn)定性評價十分必要。本文依托廈門地鐵2號線過海段工程,對荷載和侵蝕共同作用下的隧道結(jié)構(gòu)進(jìn)行了抗震性能分析,得到了如下主要研究成果:(1)介紹了隧道結(jié)構(gòu)耐久性的影響因素,其中水土荷載和氯離子侵蝕是水下盾構(gòu)隧道結(jié)構(gòu)性能劣化的主要因素,分析了水下盾構(gòu)隧道在荷載和氯離子侵蝕作用下的劣化機(jī)理。(2)基于現(xiàn)有的荷載和氯離子侵蝕作用下管片劣化本構(gòu)模型,依托廈門地鐵過海段工程,對劣化隧道結(jié)構(gòu)在地震作用下的響應(yīng)進(jìn)行了分析。(3)結(jié)合現(xiàn)有隧道結(jié)構(gòu)性能水平劃分方式,初步提出適用于圓形盾構(gòu)隧道的性能水平量化指標(biāo),并根據(jù)已有管片鋼筋銹蝕率計算公式,建立管片不同鋼筋銹蝕率區(qū)間與其抗震性能的對應(yīng)關(guān)系。(4)根據(jù)結(jié)構(gòu)容許應(yīng)力和損傷程度,初步給出了適用于圓形盾構(gòu)隧道各性能水平的量化指標(biāo)限值,并對管片不同鋼筋銹蝕率區(qū)間對應(yīng)的結(jié)構(gòu)性能水平進(jìn)行確定。
[Abstract]:With the continuous development of urban traffic tunnels, more and more underwater traffic tunnel projects are being carried out. The coastal areas of our country are located in the seismic belt around the Pacific Ocean, and the underwater traffic tunnels will inevitably cross these areas. The underwater shield tunnel is affected by complex geological environment, high water pressure, erosion environment and so on. The seismic performance of tunnel structure after deterioration in the erosion environment is even more difficult to estimate. It is necessary to evaluate the safety and stability of tunnel structure under the influence of erosion environment and seismic load. In this paper, based on the Xiamen Metro Line 2 cross sea section project, the seismic performance of the tunnel structure under the combined action of load and erosion is analyzed. The main research results are as follows: (1) the factors affecting the durability of the tunnel structure are introduced. Among them, soil and water load and chloride erosion are the main factors of structural deterioration of underwater shield tunnel. The degradation mechanism of underwater shield tunnel under load and chloride ion erosion is analyzed. (2) based on the existing constitutive model of segment deterioration under the action of load and chloride ion erosion, Xiamen subway cross sea section project is relied on. The response of the degraded tunnel structure under earthquake action is analyzed. (3) combined with the existing ways of dividing the tunnel structure performance level, the performance level quantification index suitable for circular shield tunnel is put forward preliminarily. According to the formula of corrosion rate of steel bar, the relationship between corrosion rate and seismic performance of steel bar is established. (4) according to the allowable stress and damage degree of the structure, The quantitative index limits applicable to each performance level of circular shield tunneling are preliminarily given, and the structural performance levels corresponding to different sections of steel bar corrosion rate are determined.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.43

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