Abstract: Based on the Staheli’s method for calculating the vertical soil pressure on circular jacking pipes， a vertical earth pressure calculation model for the circular flanged jacking pipe in Shenyang sandy strata was derived. The mechanical parameters of the sandy strata were tested， and the friction coefficients between soil and pipe was measured using a modified direct-shear test. The changing rules of the jacking forces and the frictional forces during the jacking process were monitored in situ. Then， a new calculation method was proposed to estimate the frictional resistance of the flanged jacking pipe in the sandy strata of Shenyang. Results from the proposed method agree well with field monitoring data， which proves the feasibility of the proposed method.

Key words: Shenyang sandy strata, jacking pipe engineering, flanged jacking pipe, frictional force, jacking force