本文選題：盾構(gòu)隧道　切入點：管片接頭　出處：《中國公路學報》2017年08期 　論文類型：期刊論文

【摘要】：針對鋼纖維混凝土管片在盾構(gòu)隧道工程中應用日益頻繁的現(xiàn)狀,以盾構(gòu)隧道鋼纖維混凝土管片接頭為試驗對象,采用足尺試驗方法對鋼纖維混凝土管片接頭和傳統(tǒng)鋼筋混凝土管片接頭的極限承載能力進行研究,歸納宏觀破壞現(xiàn)象,獲得了荷載-撓度曲線和彎矩-轉(zhuǎn)角曲線等整體力學響應特性,得到了荷載-螺栓應變關系和荷載-混凝土表面應變等局部力學響應特性,分析了受壓區(qū)剪裂縫的擴展規(guī)律,探討了接頭的延性指標,并對接頭進行了基于性能的極限承載能力評價。研究結(jié)果表明:鋼纖維混凝土管片接頭的開裂荷載比鋼筋混凝土管片接頭提高12.9%;鋼纖維混凝土管片接頭的極限荷載與鋼筋混凝土管片接頭基本一致(略微增加4.4%);鋼纖維混凝土管片接頭具有優(yōu)良的抗裂能力,受壓區(qū)剪裂縫數(shù)量為1個,少于鋼筋混凝土管片接頭的3個,承載能力極限狀態(tài)時的最大裂縫寬度從3.82mm減少到1.35mm,正常使用狀態(tài)時的最大允許裂縫寬度(0.2mm)對應的荷載抗力提高了43.75%;鋼纖維混凝土管片接頭的受力性能優(yōu)于鋼筋混凝土管片接頭;研究成果可為鋼纖維混凝土管片在盾構(gòu)隧道工程中的應用提供理論支撐和技術(shù)參考。
[Abstract]:In view of the increasingly frequent application of steel fiber reinforced concrete (SFRC) segments in shield tunnel engineering, the steel fiber reinforced concrete segment joint of shield tunnel is taken as the test object. The ultimate bearing capacity of steel fiber reinforced concrete segment joint and traditional reinforced concrete segment joint is studied by means of full-scale test, and the macroscopic failure phenomenon is summarized. The overall mechanical response characteristics such as load-deflection curve and moment-angle curve are obtained. The local mechanical response characteristics such as load-bolt strain relation and load-concrete surface strain are obtained. The propagation law of shear crack in compression zone is analyzed. The ductility index of the joint is discussed. The ultimate load-bearing capacity of steel fiber reinforced concrete segment joint is evaluated based on performance. The results show that the cracking load of steel fiber reinforced concrete segment joint is 12.9 higher than that of reinforced concrete segment joint, and the ultimate load of steel fiber concrete segment joint is higher than that of reinforced concrete segment joint. The load is basically the same as the reinforced concrete segment joint (a slight increase of 4.4%); the steel fiber reinforced concrete segment joint has excellent crack resistance, The number of shear cracks in compression zone is 1, which is less than 3 joints of reinforced concrete segments. The maximum crack width is reduced from 3.82 mm to 1.35 mm in the ultimate state of load-carrying capacity, and the load resistance corresponding to the maximum allowable crack width of 0.2mm in normal condition is increased by 43.75 mm, and the mechanical properties of the steel fiber reinforced concrete segment joint are better than that of the reinforced concrete segment joint. The research results can provide theoretical support and technical reference for the application of steel fiber reinforced concrete segment in shield tunnel engineering.
【作者單位】： 同濟大學地下建筑與工程系;同濟大學巖土及地下工程教育部重點實驗室;
【基金】：國家自然科學基金項目(51378388) 上海市科學技術(shù)委員會項目(15XD1522500,15DZ1204003)
【分類號】：U455.43

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1 陶雙龍;裝配式大孔徑鋼筋混凝土管型通道接觸模型研究[D];合肥工業(yè)大學;2010年

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本文編號：1601821