本文選題：盾構(gòu)隧道 + 裝配式襯砌��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著我國經(jīng)濟的發(fā)展和"十三五"期間城鎮(zhèn)化進程的加快,城市公共交通的大規(guī)模建設(shè)成為必然,在建設(shè)地鐵隧道時,盾構(gòu)施工法由于其受施工場地和道路交通限制少,對地面生產(chǎn)活動影響小的優(yōu)點,越來越多的成為修建城市地鐵隧道的首選工法。盾構(gòu)隧道裝配式襯砌設(shè)計的關(guān)鍵問題在于計算模型本身是否能夠真實反映襯砌的實際受力狀態(tài),目前用于盾構(gòu)隧道裝配式襯砌的橫向設(shè)計計算方法有慣用法、修正慣用法、多鉸圓環(huán)法、梁-彈簧模型和梁-接頭模型五種;縱向設(shè)計計算方法主要有縱向梁-彈簧模型、縱向等效連續(xù)化剛度折減模型兩種。上述模型都將盾構(gòu)隧道裝配式襯砌沿橫向和縱向簡化為梁結(jié)構(gòu),并且將盾構(gòu)隧道的橫向力學(xué)性能和縱向力學(xué)性能區(qū)分開來進行研究分析。然而,盾構(gòu)隧道的結(jié)構(gòu)形式非常復(fù)雜,縱向和橫向的結(jié)構(gòu)性能密不可分,現(xiàn)有的將盾構(gòu)隧道橫縱向簡化為梁的方法很多情況下無法準確反映襯砌整體的力學(xué)性能,與實際情況出現(xiàn)偏差。鑒于盾構(gòu)裝配式襯砌結(jié)構(gòu)靜力學(xué)的研究現(xiàn)狀,采用大型有限元軟件ANSYS及其二次開發(fā)語言APDL對盾構(gòu)隧道的接頭、襯砌的數(shù)值模擬以及既有隧道內(nèi)力、變形受新建隧道下穿施工的影響進行了分析研究,主要研究內(nèi)容如下:(1)對盾構(gòu)隧道接頭進行三維有限元建模,在模型幾何參數(shù)上更加接近實際設(shè)計施工情況的同時,對接頭處彈性密封襯墊的力學(xué)性能和防水效應(yīng)進行深入研究,并將襯墊的力學(xué)性能以本構(gòu)模型的方式應(yīng)用到接頭三維有限元模型計算中,得到盾構(gòu)管片的抗彎剛度,為殼-彈簧盾構(gòu)隧道襯砌模型的接頭抗彎剛度提供參數(shù)。(2)建立殼-彈簧盾構(gòu)襯砌模型,以殼單元模擬混凝土管片,以彈簧單元模擬接頭,對殼-彈簧模型承受不同軸力的接頭進行復(fù)雜非線性抗彎剛度的自動化迭代計算,得到不同拼裝方式下襯砌環(huán)的彎矩和軸力及其分布規(guī)律。(3)建立實體單元-彈簧模型,以實體單元模擬混凝土管片,以接觸單元實現(xiàn)管片間接觸作用,以不同方向的彈簧單元模擬螺栓,三者通過組合成構(gòu)件的形式模擬接頭的抗彎、抗拉壓和抗剪非線性效應(yīng)。研究了通縫、錯縫拼裝工況下襯砌彎矩和軸力分布的規(guī)律,并且將實體-彈簧模型,殼-彈簧模型的計算結(jié)果與慣用法和多鉸圓環(huán)法進行對比分析。(4)依托國內(nèi)某新建地鐵盾構(gòu)隧道下穿既有運營地鐵隧道實際工程,對施工進行全過程計算機仿真數(shù)值模擬。采用溫度應(yīng)變比擬的方式,模擬了新建隧道同步注漿漿液在凝固過程中的體積縮減效應(yīng),并通過將實體-彈簧模型引入到地層中構(gòu)成地層-結(jié)構(gòu)計算模型,模擬既有隧道在新建盾構(gòu)隧道開挖時,既有隧道的位移影響和結(jié)構(gòu)內(nèi)力影響。揭示了開挖過程對于既有線盾構(gòu)隧道管片彎矩,軸力,螺栓受力以及管片錯臺,接縫張開的變化規(guī)律。
[Abstract]:With the economic development of our country and the acceleration of urbanization during the 13th Five-Year Plan period, the large-scale construction of urban public transport becomes inevitable. In the construction of subway tunnel, the shield construction method is limited by the construction site and road traffic. The advantages of little influence on ground production activities have become the preferred method for the construction of urban subway tunnels. The key problem in the design of the assembled lining of shield tunnel is whether the calculation model itself can truly reflect the actual stress state of the lining. At present, the transverse design and calculation method for the assembled lining of shield tunnel has the customary method and the modified customary method. There are five kinds of multi-hinge ring method, beam-spring model and beam-joint model, and the longitudinal design calculation methods mainly include longitudinal beam-spring model and longitudinal equivalent continuous stiffness reduction model. The above models simplify the assembled lining of shield tunnel to beam structure along the transverse and longitudinal direction, and distinguish the transverse and longitudinal mechanical properties of shield tunnel. However, the structural form of shield tunnel is very complex, and the longitudinal and transverse structural properties are inseparable. The existing methods to simplify the transverse and longitudinal of shield tunnel to beam can not accurately reflect the mechanical properties of the lining in many cases. Deviate from the actual situation. In view of the present situation of the statics research of shield assembled lining structure, the joint of shield tunnel, the numerical simulation of lining and the internal force of existing tunnel are simulated by using ANSYS and APDL, a large-scale finite element software. The deformation affected by the underpass construction of the new tunnel is analyzed and studied. The main research contents are as follows: (1) the 3D finite element modeling of shield tunnel joint is carried out, and the geometric parameters of the model are more close to the actual design and construction situation at the same time. The mechanical properties and waterproof effect of elastic seal gasket at the joint are studied in depth. The mechanical properties of the gasket are applied to the three-dimensional finite element model calculation of the joint, and the bending stiffness of shield segment is obtained by applying the mechanical properties of the gasket to the three-dimensional finite element model of the joint. To provide parameters for the joint bending stiffness of the shell spring shield tunnel lining model, the shell spring shield lining model is established. The concrete segment is simulated by the shell element and the joint is simulated by the spring element. Automatic iterative calculation of complex nonlinear bending stiffness of joints with shell spring model subjected to different axial forces is carried out, and the bending moment and axial force of lining ring and its distribution law under different assembling modes are obtained. The concrete segment is simulated by solid element, the contact action between segments is realized by contact element, the bolt is simulated by spring element in different directions, and the bending, tension and compression and shearing nonlinear effects of joints are simulated by the combination of the three elements. The distribution of bending moment and axial force of lining under the condition of jointing and assembling joint is studied, and the solid-spring model is used. The calculation results of the shell-spring model are compared with the conventional method and the multi-hinged ring method. The numerical simulation of the whole process of construction is carried out by relying on the actual project of a newly built subway shield tunnel passing through the existing operating subway tunnel in China. In this paper, the volume reduction effect of synchronous grouting in new tunnel during solidification is simulated by using temperature-strain analogy, and the solid spring model is introduced into the stratum to form a stratigraphic structure calculation model. The influence of displacement and internal force of existing tunnel on the excavation of newly built shield tunnel is simulated. The variation of the moment, axial force, bolt force, segment stagger and joint opening of the existing shield tunnel segment during excavation is revealed.
【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

【參考文獻】

相關(guān)期刊論文 前10條

1 徐國文;王士民;汪冬兵;;基于接頭抗彎剛度非線性的殼-彈簧-接觸-地層模型的建立[J];工程力學(xué);2016年12期

2 周海鷹;布春磊;江明;;殼-矩陣-彈簧模型襯砌結(jié)構(gòu)受力性能研究[J];地下空間與工程學(xué)報;2016年03期

3 蘇宗賢;何川;;盾構(gòu)隧道縱向變形附加內(nèi)力的殼-彈簧-接觸模型數(shù)值分析[J];現(xiàn)代隧道技術(shù);2015年06期

4 李成強;郭冰;李明宇;王志良;;考慮收斂變形的通縫拼裝盾構(gòu)隧道縱向等效抗彎剛度計算分析[J];隧道建設(shè);2015年02期

5 馮士杰;來永玲;;盾構(gòu)隧道同步注漿漿液壓力變化規(guī)律研究[J];科學(xué)技術(shù)與工程;2014年33期

6 葉飛;楊鵬博;毛家驊;毛燕飛;陳治;孫昌海;;基于模型試驗的盾構(gòu)隧道縱向剛度分析[J];巖土工程學(xué)報;2015年01期

7 歐陽文彪;;盾構(gòu)隧道管片接頭受力的精細化三維有限元分析[J];中國市政工程;2014年04期

8 歐陽文彪;;盾構(gòu)隧道橡膠密封墊力學(xué)性能試驗及數(shù)值分析[J];隧道建設(shè);2013年11期

9 郭瑞;何川;封坤;肖明清;;大斷面水下盾構(gòu)隧道管片接頭抗彎剛度及其對管片內(nèi)力影響研究[J];中國鐵道科學(xué);2013年05期

10 拓勇飛;舒恒;郭小紅;丁文其;王建;;超高水壓大直徑盾構(gòu)隧道管片接縫防水設(shè)計與試驗研究[J];巖土工程學(xué)報;2013年S1期

相關(guān)會議論文 前1條

1 俞濤;何川;曾東洋;;地鐵盾構(gòu)隧道管片接頭的三維有限元分析[A];城市地下空間開發(fā)與地下工程施工技術(shù)高層論壇論文集[C];2004年

，

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