本文提出荷载一结构模式进行随机反分析方法，从隧道支护结构变形反推估计对应于支护结构上各部位的夕卜荷载。提出了以实测位移为基础的样条函数插值,以插值位移补充大量的实测值,满足了反分析所需众多的已知位移数。本文通过一施工实例对该方法的可用性进行了检验。

A stochastic back analysis method of load — structure model is proposed to esti?mate load on tunnel lining according to the measured displacements. The spline interpolation function was calculated by the field measured displacements of key lining points and was used to replace approximately the real displacement function of tunneL The interpolation displace?ments of lining points can provide the necessary number of measured data in this back analy?sis. A case study on a tunnelling is presented to illustrate the effectiveness of this method.