考虑接头影响的盾构法隧道衬砌管环力学模型

回顾并总结了国内外学者对侧向地层抗力分布的研究.考虑接头和侧向地层抗力分布变化对盾构隧道衬砌内力和位移的影响,建立了改进的弹性铰管环结构力学模型,同时应用结构力学力法原理,推导出土压力、静水压力、竖向地基抗力、侧向地层抗力变化分布、管环自重5种荷载共同作用下管环内力的解析解.通过工程实例分析表明,采用推导的计算模型得到的计算结果与惯用法和数值方法计算的结果吻合较好,改进的力学模型是合理的.

Mechanical model of shield method tunnel segment lining considering joint effect

This paper reviews and summarizes the research of lateral soil resistance changing in distribution at home and abroad,an improved mechanical model that considers the effects of joints and changing distribution of soil resistant pressure on internal forces and displacements acting on shield tunnel segments rings is proposed.The segmental lining suffers the action of ground pressures,hydrostatic pressure,vertical soil resistance,lateral soil resistance changing in distribution and dead loading.The mechanical method is used to obtain an analytical solution to the internal forces of the lining under these loads.Some practical engineering cases were studied,and the calculation results obtained by the deduced mechanical model agree with routine method and numerical simulation method.The improved mechanical model is reasonable.