【摘要】：作為重大基礎設施城市軌道交通多修建于地下,存在服役環(huán)境復雜、可維修性差以及維護成本高等特點。對于軌道交通普遍采用的盾構隧道而言,其管片接頭是襯砌的連接的重要部位同時也是薄弱環(huán)節(jié),其耐久性問題相對突出且對隧道整體耐久性能有極其重要影響。 本文依托國家基礎研究發(fā)展計劃(973)《地下結構性能與環(huán)境耦合作用機制》(2011CB013802)等課題為依托,以長沙地鐵隧道實際工程為背景,采用理論分析,試驗模擬以及數值仿真等手段,對地下環(huán)境下地鐵隧道管片接頭耐久性能演化進行系統(tǒng)地研究。 (1)在總結管片接頭服役環(huán)境常見影響因素的基礎上,從材料和結構兩方面分析了管片接頭耐久性問題,提出了以抗?jié)B性能為指標的耐久性能評價標準。 (2)針對管片接頭服役環(huán)境,進行了地下水環(huán)境下管片接頭防水材料——三元乙丙橡膠加速老化試驗,得出了水環(huán)境下橡膠材料的性能劣化規(guī)律。由此構建了接縫防水材料時變演化模型,分析了超彈性材料參數性能劣化規(guī)律。 (3)設計管片接頭抗?jié)B性能試驗裝置,進行了多種接觸狀態(tài)下接頭抗?jié)B性能試驗,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,提出了接頭應力—滲流耦合模型,推導了接觸界面應力—滲流耦合方程,分析了接頭變形狀態(tài)與滲流關系問題。 (4)采用數值計算方法,從局部與整體兩個層次分別建立管片接頭應力松弛演化模型及盾構隧道三維多尺度混合模型,引入防水材料時變演化模型,分析了襯砌結構在服役周期內接觸壓力變化及趨勢,結合接觸邊界應力—滲流耦合方程,揭示了管片接頭在全壽命周期內的耐久性能演化過程,并據此對管片接頭維護提出了合理建議。 (5)通過盾構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測值,繪制了管片接頭壽命評估圖,并以此結果為基礎評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.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U231.3;U455.43

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