【摘要】：現(xiàn)今,采用錯(cuò)縫拼裝的通用管片形式已經(jīng)在國(guó)內(nèi)取得了廣泛的應(yīng)用,同時(shí)由于諸多的原因,某些采用此種管片形式的盾構(gòu)隧道出現(xiàn)了結(jié)構(gòu)及耐久性損傷。結(jié)構(gòu)損傷會(huì)影響地鐵線路的正常運(yùn)營(yíng),尤其是整體變形不僅會(huì)影響到盾構(gòu)隧道各項(xiàng)行車(chē)指標(biāo)的變化,也會(huì)降低盾構(gòu)管片結(jié)構(gòu)的整體承載力,對(duì)盾構(gòu)隧道的安全性和可靠度產(chǎn)生威脅。因此,通用管片的安全和使用性能受到了社會(huì)的廣泛關(guān)注和運(yùn)營(yíng)單位的高度重視,通用管片隧道的變形機(jī)理和影響因素需要進(jìn)行更深入的研究。由于地鐵隧道周邊城市開(kāi)發(fā)的滯后性,在地鐵保護(hù)區(qū)范圍內(nèi)進(jìn)行后期施工建設(shè)不可避免,尤其是緊鄰隧道的深基坑施工會(huì)對(duì)盾構(gòu)結(jié)構(gòu)的安全性產(chǎn)生較為嚴(yán)重的影響。深圳1號(hào)線前鯉區(qū)間在國(guó)內(nèi)較早地采用了通用管片結(jié)構(gòu),并且由于周邊歷史堆載和降水原因,管片結(jié)構(gòu)已經(jīng)產(chǎn)生了較為嚴(yán)重的收斂變形和損傷。同時(shí),深圳前海交易廣場(chǎng)深基坑工程上跨區(qū)間盾構(gòu)隧道,其基坑施工活動(dòng)會(huì)對(duì)該段區(qū)間盾構(gòu)隧道的運(yùn)營(yíng)和結(jié)構(gòu)安全產(chǎn)生較大的影響。該現(xiàn)狀區(qū)間隧道能否承受后續(xù)的施工荷載變化需要驗(yàn)證和研究。本文針對(duì)上述工程和研究需要,進(jìn)行了如下方面的工作:(1)錯(cuò)縫拼裝整環(huán)足尺試驗(yàn)研究結(jié)合前鯉區(qū)間歷史原因造成的已有損傷,設(shè)計(jì)了包含前鯉區(qū)間200環(huán)及其鄰近環(huán)的三環(huán)錯(cuò)縫拼裝整環(huán)足尺承載力試驗(yàn),確定了管片環(huán)正常使用和承載力極限受力變形狀態(tài),驗(yàn)證了盾構(gòu)隧道在后續(xù)施工工況下的安全性和可靠性。(2)三維非線性接觸有限元仿真計(jì)算同步建立了與管片試驗(yàn)一致的仿真模型,采用仿真重演方式進(jìn)行了模型驗(yàn)證,通過(guò)對(duì)比分析闡述了試驗(yàn)管片結(jié)構(gòu)的變形機(jī)理,明確了接縫位置形成塑性鉸和管片環(huán)間作用對(duì)中環(huán)腰部收斂變形和破壞分布的決定性影響。對(duì)環(huán)間摩擦系數(shù)的敏感性進(jìn)行了參數(shù)分析,并以此明確了管片結(jié)構(gòu)的傳力路徑。(3)盾構(gòu)隧道變形影響分析在試驗(yàn)仿真模型的基礎(chǔ)上,分析了隧道頂部超載、側(cè)向卸載、周邊降水等不同工況以及封頂塊不同拼裝角度對(duì)盾構(gòu)隧道的影響,明確了管片環(huán)頂側(cè)加載力差值對(duì)收斂變形發(fā)展的控制性作用,以及封頂塊的拼裝方式對(duì)管片環(huán)變形性能的顯著性影響。
[Abstract]:Nowadays, the universal segment form with staggered joints has been widely used in our country. At the same time, for many reasons, some shield tunnels with this kind of segment form have been damaged in structure and durability. Structural damage will affect the normal operation of subway lines, especially the overall deformation will not only affect the change of driving index of shield tunnel, but also reduce the overall bearing capacity of shield segment structure. It threatens the safety and reliability of shield tunnel. Therefore, the safety and performance of the universal segment have been paid more attention by the society and the operation units. The deformation mechanism and the influencing factors of the universal segment tunnel need to be further studied. Due to the lag in the development of metro tunnel surrounding cities, it is inevitable to carry out the later construction in the subway protection area, especially the construction of deep foundation pit next to the tunnel will have a serious impact on the safety of shield structure. The common segment structure was adopted in the front common carp section of Shenzhen No. 1 Line earlier in China, and the segment structure has already produced serious convergent deformation and damage due to the historical heaped load and precipitation around it. At the same time, the operation and structural safety of shield tunnel in Shenzhen Qianhai Exchange Square will be greatly affected by the foundation pit construction activity of the cross-section shield tunnel on the deep foundation pit project of Shenzhen Qianhai Exchange Square. It is necessary to verify and study whether the tunnel can withstand the subsequent construction load change. According to the above engineering and research needs, the following works have been done in this paper: (1) the full-scale experimental study of the dislocation joint assembly ring combined with the existing damage caused by the historical causes of the former common carp section, In this paper, the full-scale bearing capacity test of three-ring staggered joints including 200 rings in front carp section and its adjacent rings is designed, and the normal use of segment rings and ultimate bearing capacity deformation state are determined. The safety and reliability of shield tunnel under subsequent construction conditions are verified. (2) Three-dimensional nonlinear contact finite element simulation calculation synchronously establishes the simulation model consistent with the segment test. By comparing and analyzing the deformation mechanism of the experimental segment structure, the decisive influence of the plastic hinge formed at the joint position and the interaction between the segment ring and the segment ring on the convergent deformation and failure distribution in the waist of the ring is clarified. The sensitivity of friction coefficient between rings is analyzed, and the load transfer path of segment structure is determined. (3) on the basis of the experimental simulation model, the overload and lateral unloading of the top of the shield tunnel are analyzed. The influence of different working conditions such as peripheral precipitation and different assembling angle of roof block on shield tunnel is made clear, and the controlling effect of the difference of loading force on the development of convergent deformation is made clear. And the significant influence of the assembling method of the top block on the deformation performance of the segment ring.
【學(xué)位授予單位】：中國(guó)鐵道科學(xué)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U455.43

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