【摘要】：作為重大基礎(chǔ)設(shè)施城市軌道交通多修建于地下,存在服役環(huán)境復(fù)雜、可維修性差以及維護(hù)成本高等特點(diǎn)。對(duì)于軌道交通普遍采用的盾構(gòu)隧道而言,其管片接頭是襯砌的連接的重要部位同時(shí)也是薄弱環(huán)節(jié),其耐久性問題相對(duì)突出且對(duì)隧道整體耐久性能有極其重要影響。 本文依托國(guó)家基礎(chǔ)研究發(fā)展計(jì)劃(973)《地下結(jié)構(gòu)性能與環(huán)境耦合作用機(jī)制》(2011CB013802)等課題為依托,以長(zhǎng)沙地鐵隧道實(shí)際工程為背景,采用理論分析,試驗(yàn)?zāi)M以及數(shù)值仿真等手段,對(duì)地下環(huán)境下地鐵隧道管片接頭耐久性能演化進(jìn)行系統(tǒng)地研究。 (1)在總結(jié)管片接頭服役環(huán)境常見影響因素的基礎(chǔ)上,從材料和結(jié)構(gòu)兩方面分析了管片接頭耐久性問題,提出了以抗?jié)B性能為指標(biāo)的耐久性能評(píng)價(jià)標(biāo)準(zhǔn)。 (2)針對(duì)管片接頭服役環(huán)境,進(jìn)行了地下水環(huán)境下管片接頭防水材料——三元乙丙橡膠加速老化試驗(yàn),得出了水環(huán)境下橡膠材料的性能劣化規(guī)律。由此構(gòu)建了接縫防水材料時(shí)變演化模型,分析了超彈性材料參數(shù)性能劣化規(guī)律。 (3)設(shè)計(jì)管片接頭抗?jié)B性能試驗(yàn)裝置,進(jìn)行了多種接觸狀態(tài)下接頭抗?jié)B性能試驗(yàn),著重研究了接頭滲流發(fā)生后其滲流變化規(guī)律。將接頭滲流視為平面狹縫滲流問題,提出了接頭應(yīng)力—滲流耦合模型,推導(dǎo)了接觸界面應(yīng)力—滲流耦合方程,分析了接頭變形狀態(tài)與滲流關(guān)系問題。 (4)采用數(shù)值計(jì)算方法,從局部與整體兩個(gè)層次分別建立管片接頭應(yīng)力松弛演化模型及盾構(gòu)隧道三維多尺度混合模型,引入防水材料時(shí)變演化模型,分析了襯砌結(jié)構(gòu)在服役周期內(nèi)接觸壓力變化及趨勢(shì),結(jié)合接觸邊界應(yīng)力—滲流耦合方程,揭示了管片接頭在全壽命周期內(nèi)的耐久性能演化過程,并據(jù)此對(duì)管片接頭維護(hù)提出了合理建議。 (5)通過盾構(gòu)隧道三維多尺度混合模型給出了隧道服役的一種典型差異沉降情況,分析計(jì)算了此工況下管片接頭在不同外界水壓下的耐久性能演化過程及壽命預(yù)測(cè)值,繪制了管片接頭壽命評(píng)估圖,并以此結(jié)果為基礎(chǔ)評(píng)估了管片接頭滿足耐久性要求的外界條件。
[Abstract]:As a major infrastructure urban rail transit is mostly built underground which has the characteristics of complex service environment poor maintainability and high maintenance cost. For shield tunnel which is widely used in rail transit, the segment joint is an important part of lining connection and is also a weak link. The durability problem is relatively prominent and has an extremely important impact on the overall durability of the tunnel. Based on the National basic Research and Development Program (973), "Coupling Mechanism of Underground structure performance and Environment" (2011CB013802), and taking the actual project of Changsha Metro Tunnel as the background, this paper adopts theoretical analysis. By means of experimental simulation and numerical simulation, the durability evolution of segment joints in underground subway tunnel is studied systematically. The main contents are as follows: (1) on the basis of summarizing the common influencing factors of segment joint service environment, the durability problem of segment joint is analyzed from two aspects of material and structure, and the evaluation standard of durability is put forward, which takes impermeability as index. (2) in view of the service environment of segment joint, the accelerated aging test of ethylene propylene diene rubber (EPDM), a waterproof material for segment joint under groundwater environment, was carried out, and the performance deterioration rule of rubber material in water environment was obtained. A time-varying evolution model of jointed waterproofing material was established, and the degradation rule of hyperelastic material parameters was analyzed. (3) the impermeability test equipment of segment joint is designed, and the seepage resistance test of joint under various contact conditions is carried out, and the seepage variation law of joint seepage is studied emphatically. The joint seepage is regarded as a plane slit seepage problem. A joint stress-seepage coupling model is proposed. The contact interface stress-seepage coupling equation is derived and the relationship between the joint deformation state and seepage flow is analyzed. (4) the stress relaxation evolution model of segment joint and the three-dimensional multi-scale mixed model of shield tunnel are established by numerical calculation method, and the time-varying evolution model of waterproof material is introduced. The variation and trend of contact pressure during the service cycle of lining structure are analyzed. Combined with the contact boundary stress-seepage coupling equation, the evolution process of durability performance of segment joints during the whole life cycle is revealed. Based on this, reasonable suggestions are put forward for segment joint maintenance. (5) A typical differential settlement of tunnel service is given by using the three-dimensional multi-scale hybrid model of shield tunnel, and the evolution process and life prediction value of segment joints under different external water pressure are analyzed and calculated. The life evaluation diagram of segment joint was drawn, and the external condition of segment joint meeting durability requirement was evaluated on the basis of the result.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U231.3;U455.43

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