Abstract：Abstract ： Research purposes ： Witli the increasing development of railway tunnel design technology，compared witli the safety coefficient method，the probability limit state method can consider much more comprehensive factors to make safety assessment more reasonable and reliable. Combined with specific engineering case，based on the element software ANSYS modeling to solve structure internal force calculation， this paper usd MATLAB to compose the H - L method program to calculate the reliability of the diferent open cut tunnels，compared the reliability of the diferent open cut tunnels and explored the relationship between its reliability and the influence factors， to provide reference for the research of related tunnel. Research conclusions ：( 1) Limit state design method can comprehensively reflect the uncertainty of every factor and the integrity of the structure，which is much better than the safety factor method. (2) The safety stock of the open cut tunnel structure in every speed is very enough now. The double - line tunnel) s design parameters are more conservative than the single - line tunnel) s，but this phenomenon becomes not obvious with the increase of speed. (3) Excavation site and thickness of covering soil below 4 m have weak influence on the reliability of the open cut tunnel structure，but the stress form have significant influence on it. (4) Making the reasonable arch axis can greatly improve the overall reliability of theopen cut tunnel. (5) The research result can provide the reference for open cut tunnel design wit!i the probability limit state method.
2016, Vol. 33 
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