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针对接头对盾构隧道衬砌内力和位移的影响,提出了弹性铰管环结构力学改进模型.应用力法,推导出静水压力、水平及竖向地基抗力、土压力、管环自重4种荷载作用下管环内力和位移解析解.以北京地铁十号线为具体工程背景,研究了接头刚度、接头位置和接头数目对管环结构内力的影响规律,并与Lee的模型计算结果进行了对比分析,结果发现,接头刚度对管环弯矩、管环轴力的影响较大;接头数目和接头位置对管环弯矩、轴力的影响较小;两模型计算值差异主要体现在当160°≤φ≤180°时,改进模型计算弯矩呈下降趋势,而Lee的模型计算弯矩呈上升趋势。改进模型的计算结果与实际较为吻合.
Aiming at the influence of joints on internal force and displacement of shield tunnel lining, a mechanics improvement model of elastic hinge pipe ring structure is put forward. Four load effects of hydrostatic pressure, horizontal and vertical foundation resistance, earth pressure and pipe loop weight are deduced. The analysis of internal forces and displacements of the lower tube ring.Based on the background of Beijing Metro Line 10, the influence of joint stiffness, joint position and number of joints on the internal force of tube-ring structure was studied and compared with the results of Lee’s model calculation The results show that the joint stiffness has a great influence on the bending moment of the pipe ring and the axial force of the pipe ring. The number of joints and the location of the joints have less influence on the bending moment and axial force of the pipe ring. ≤ φ ≤ 180 °, the bending moment of the improved model shows a downward trend, while the bending moment of Lee’s model shows an upward trend. The results of the improved model are in good agreement with the actual ones.