Abstract: The STS (steel tube slab) method was applied in the Olympic metro station project in Shenyang. Based on the pressure arch theory， a formula of STS pipe-jacking friction resistance was deduced based on the cause of the earth pressure on the pipe week. The theoretical calculation result agrees well with the in-situ monitoring data. The influence of the fringe on the jacking force is obvious and the calculation of which cannot use the simple superposition method. Affected by the "embolism" effect， the soil pressure on the tube side is small. The jacking force of STS pipe calculated according to the international design codes is smaller than the monitoring results by 28% ~ 40% due to not taking the fringe effect into account.

Key words: STS method, jacking force, pipe-jacking, pressure arch theory, finite soil pressure theory