通过采用荷载结构模式中连续的自由变形圆环法，对某城市地铁区间隧道衬砌圆环内力的计算，发现土的侧向抗力、侧土压力值对内力影响很大，特别是对弯矩的影响，这将对工程造价产生很大影响。提出如将抗力系数取为实验值１／４到１／６，或土压力系数稍高于静止土压力系数，将侧向抗力和侧向土压力综合考虑，内力计算结果将是合理的。 Through the continuous free-form ring method in load structure mode, it is found that the lateral resistance and side earth pressure exert a great influence on the internal forces, especially for the bending moment Impact, which will have a great impact on project cost. It is suggested that if the resistance coefficient is taken as 1/4 to 1/6 of the experimental value or the earth pressure coefficient is slightly higher than the static earth pressure coefficient, the lateral resistance and the lateral earth pressure will be considered synthetically, and the calculation result of the internal force will be reasonable.