拱形隧道弹性抗力的确定方法

Method of Determining the Elastic Resistance for Arched Tunnel

隧道衬砌结构计算中弹性抗力的分布,目前采用布佳耶娃法假定弹性抗力,由于此法不能满足局部变形理论,对隧道衬砌结构内力的计算结果影响很大。本文提出了准确确定拱形隧道结构弹性抗力分布规律的新方法—迭代法;详细介绍了迭代法的基本思想、影响弹性抗力分布规律的因素、具体方法以及如何提高迭代速度,并给出采用迭代法计算结构内力的具体过程;通过实际算例,对比迭代法与布佳耶娃法结构内力计算结果的差异。最后指出迭代法的适用范围及有待进一步研究的必要。

For calculation of the distribution of elastic resistance in tunnel lining structure, at present the Buddehiarieva method is adopted to assume the elastic resistance, because this method can＇t meet the local deformation theory, there are big differences in the calculation results of internal force of the tunnel lining structure . This paper puts forward a new calculation method - Iterative method which can accurately determine the elastic resistance distribution law of curved wall tunnel, and introduces basic idea, influencing factor of elastic resistance distribution law, practical approach of Iterative method, and the method of improving iterative speed, then, the process for calculating internal force of structure is given using Iterative method; the differences in calculation results of internal force of structure by Iterative method and Budd-chiarieva method are compared by practical calculation examples. Finally, the application scope of iterative method and necessity for further study are suggested.