分析了目前常见的两种计算基坑支撑刚度方法的差异、优缺点和适用范围。通过建模,用弹性支点法分别计算分析了单道支撑和两道支撑条件下,支撑刚度变化对支撑轴力及支护桩桩身内力的影响。计算结果表明:对于单层支撑系统,随着支撑刚度的增大,支护桩的最大弯矩和剪力稍有增加,而支撑轴力的增大幅度比较明显,且当支撑刚度增大到临界值后轴力趋于稳定;对于双层支撑系统,增加支撑刚度对支撑轴力起到增大的作用,但对支护桩内力的影响却各不相同。 The differences, advantages, disadvantages and applicable ranges of two methods for calculating the supporting stiffness of foundation pit are analyzed. Through the modeling, the influence of the support stiffness on the supporting axial force and the internal force of supporting piles under the condition of single support and two supports was calculated and analyzed respectively by the elastic fulcrum method. The calculation results show that for the single-story support system, the maximum moment and shear force of the supporting pile increase slightly with the increase of the supporting stiffness, while the increase of the supporting axial force is obvious. When the supporting stiffness increases to The critical axial force tends to be stable. For the double-support system, increasing the support stiffness can increase the support axial force, but the influence on the internal force of the support pile is different.