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以往多层地基的顶面当量回弹模量大多是按弯沉等效得出的,该值对计算地基上面层或基层的弯拉应力是不适合的。为此,在弯沉等效的地基顶面当量回弹模量计算式的基础上,通过对荷载圆半径的修正,将弯沉等效转变为弯拉应力等效;进而,总结出了三层结构时单圆和双圆荷载的荷载圆半径修正系数回归公式,并拓展至多层结构;最后,通过工程实例证实,用弯沉等效的地基顶面当量回弹模量计算刚性或半刚性基层层底弯拉应力偏小13%~22%,而用弯拉应力等效的地基顶面当量回弹模量计算得到的基层层底弯拉应力与理论值的误差不超过1%。
In the past, the top equivalent equivalent modulus of elasticity of multi-layered foundations was mostly equivalent to deflection, which is not suitable for calculating the bending stress of the top or base of foundation. Therefore, on the basis of the formula of the equivalent rebound modulus at the equivalent ground surface of the deflection, the deflection equivalent is transformed into equivalent bending and tensioning stress by correcting the radius of the load circle. Furthermore, Layer structure, the formulas of the radius correction coefficients for the single-circle and double-circle loads are extended to the multi-layer structure. Finally, it is verified through engineering examples that the flexural equivalent top-surface equivalent elastic modulus is used to calculate the rigid or semi-rigid The bending stress at the bottom of the grass roots is 13% ~ 22% smaller than that at the bottom. The error of the bending stress at the bottom of the grass roots calculated by the equivalent modulus of elasticity at the top of the foundation is less than 1%.