Abstract：
Considering that the safety factor method used for traditional structural tunnel design cannot indicate the variability of a structure due to the complex underground environment, and using a U-shaped bored metro station as an example, this paper verifies the scientific validity of the reliability design method based on an ANSYS model and a response surface method. Specifically, it obtains the distribution of the reliability indexes of the lining section by establishing a limit equation with the lining deformation and compares the two design methods by using the sections with the lowest and most suddenly-changed reliability indexes as control sections. The results show that the two methods are consistent, with the reliability design being more intuitive and scientific compared to the safety factor method during design and evaluation of the engineering structure, and therefore it may become the main method in future tunnel structural design.
2016, Vol. 53 