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Analytical solutions and in-situ measurements on the internal forces of segmental lining produced in the assembling process
Transportation Geotechnics ( IF 5.3 ) Pub Date : 2020-11-30 , DOI: 10.1016/j.trgeo.2020.100478
Meng-bo Liu , Shao-ming Liao , Jin Xu , Yan-qing Men

Most of the traditional design methods assumed shield tunnel lining as a perfectly formed ring, without special attention to the effect of pre-deformations and inaccuracies produced in the assembling process before the segmental ring is closed. However, these factors can significantly affect the mechanical performance and durability of the tunnel. To make up for the deficiencies of conventional design models, we contributed a new method to evaluate the internal forces of tunnel lining produced in the assembly, in which the key idea is to appropriately assume the assembly tolerance of bolt holes and pre-deformations of the lining ring. By applying the principle of minimum potential energy, analytical solutions for three cases (ALS-FF, ALS-FC, ALS-CC) were developed to determine the internal forces of segments produced in the assembly process. Then, an in-situ measurement was conducted to validate the method, and it showed a favorable agreement with the theoretical results. Furthermore, the critical parameters of the proposed model were verified by parametric studies, which revealed that the higher the tolerance space Tsp, the lower the internal forces induced by the assembly inaccuracy. According to the research results, the reasonable tolerance space Tsp and other critical design parameters can be determined for a shield tunnel to achieve optimal performance. The simplicity and practicability of the analytical method, as well as the quantitative evaluation of the effects of assembly inaccuracy on tunnel lining, would undoubtedly contribute to the improvements and optimizations of the design of segmental tunnel lining.



中文翻译:

组装过程中分段衬砌内力的解析解和现场测量

大多数传统设计方法都将盾构隧道衬砌视为完美成形的环,而没有特别注意分段环闭合之前的预变形和组装过程中产生的误差。但是,这些因素会严重影响隧道的机械性能和耐久性。为了弥补传统设计模型的不足,我们提供了一种新的方法来评估组件中产生的隧道衬砌的内力,其关键思想是适当地假定螺栓孔的组件公差和预变形。衬圈。通过应用最小势能原理,针对三种情况(ALS-FF,ALS-FC,ALS-CC)开发了分析解决方案,以确定组装过程中产生的扇形段的内力。然后,进行了现场测量以验证该方法的有效性,与理论结果吻合良好。此外,通过参数研究验证了所提出模型的关键参数,结果表明,公差空间越高T sp,由装配误差引起的内力越低。根据研究结果,可以确定盾构隧道的合理公差空间T sp和其他关键设计参数,以实现最佳性能。分析方法的简便性和实用性,以及对装配误差对隧道衬砌影响的定量评估,无疑将有助于分段隧道衬砌设计的改进和优化。

更新日期:2020-12-21
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