EPB shield is widely used in the construction of Metro tunnels. Ground surface settlement induced by shield tunneling directly affects the safety of the tunnel construction. The authors use different theoretical methods to calculate the range of the pressure on the tunnel face in a shieldbored tunnel on Line 3 of Chengdu Metro. The shield boring process with different ground loss ratios and different pressures on the tunnel face is simulated by ABAQUS software embedded by constitutive model of soil stress path. The law of ground surface settlement induced by shield boring in gravel strata is obtained. The comparison and contrast between the ground surface settlement measured in the field and that obtained by means of theoretical calculations proves that the constitutive model adopted is rational. Proper range of the pressure on the tunnel face is determined. In addition, the relationship between the pressure on the tunnel face and the ground loss ratio is investigated and summarized so as to provide reference for similar projects in the future.