【摘要】：實際工程中,盾構隧道縱向彎矩和軸力可能同時存在,若按傳統(tǒng)的純彎等效抗彎剛度計算可能會帶來較大誤差。考慮軸力和彎矩共同作用對縱向彎曲變形的影響,提出5種彎曲模式,在經(jīng)典的志波模型的基礎上,建立盾構隧道縱向等效抗彎剛度計算模型,基于該模型開發(fā)了計算程序,以成都地鐵3號線盾構隧道為實例,對其縱向等效抗彎剛度和管環(huán)張開量隨軸力和彎矩的發(fā)展規(guī)律進行分析,并討論彎曲模式的實用判別方法,求出變形過程的臨界彎矩,最后給出縱向彎曲變形為線性和非線性的內力條件。研究發(fā)現(xiàn):盾構隧道縱向變形隨彎矩的發(fā)展過程可按軸力分為4類,各過程下管環(huán)張開量和等效抗彎剛度隨彎矩的發(fā)展規(guī)律十分不同;軸力對等效抗彎剛度有顯著影響,一般呈現(xiàn)壓彎純彎拉彎的規(guī)律。研究成果可應用于盾構隧道結構縱向力學分析、抗彎剛度分析等方面。
[Abstract]:In practical engineering, the longitudinal bending moment and axial force of shield tunnel may exist at the same time. If the traditional calculation of equivalent bending stiffness of shield tunnel is taken into account, there may be a large error in calculating the equivalent bending stiffness of shield tunnel. Considering the influence of axial force and bending moment on longitudinal bending deformation, five bending modes are put forward. Based on the classical log wave model, the calculation model of longitudinal equivalent bending stiffness of shield tunnel is established, and the calculation program is developed based on this model. Taking the shield tunnel of Chengdu Metro Line 3 as an example, the development law of longitudinal equivalent bending stiffness and pipe ring opening with axial force and bending moment is analyzed, and the practical discrimination method of bending mode is discussed, and the critical moment of deformation process is obtained. Finally, the internal force conditions under which the longitudinal bending deformation is linear and nonlinear are given. It is found that the longitudinal deformation of shield tunnel can be divided into four types according to the axial force with the development of bending moment. The opening amount of the pipe ring and the equivalent bending stiffness under each process are very different with the development rule of the bending moment. Axial force has a significant effect on the equivalent bending stiffness, and generally presents the law of pure bending and tension bending. The research results can be applied to longitudinal mechanics analysis and bending stiffness analysis of shield tunnel structure.
【作者單位】： 西南交通大學交通隧道工程教育部重點實驗室;
【基金】：國家自然科學基金資助項目(51378433,51578457) 國家重點研發(fā)計劃(2016YFC082202)~~
【分類號】：U455.43

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