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本文根据实测振动基础求得的地基刚度系数C_z与基础底面积F之间变化规律的分析,确认有限弹性层的存在。按照有限弹性层并考虑土的弹性常数随深度增加的影响,利用野外波速法或室内动三轴试验准确测得土的动弹性模量E和泊松比μ后,应用本文有关计算公式即可求得质阻弹计算模型中所需的C_z值。此法比实测基础反算C_z简单方便,比《动力机器基础设计规范》中按土的容许承载力确定符合实际。本文还推导了计算有限弹性层深度的半经验公式。指出了基础在动力作用下土中弹性变形的影响深度比静力作用下要浅,动刚度比静刚度要大(基础越大越明显)的问题,从而提出了弹性半空间计算模型不符合实际的缺点,为探索有限弹性层计算模型提供参考。
Based on the analysis of the variation law between the foundation stiffness coefficient C_z and the base area F obtained from the measured vibration foundation, the existence of the finite elastic layer is confirmed. In accordance with the finite elastic layer and taking into account the influence of soil elastic constants with depth, using the field velocity method or indoor dynamic triaxial test to accurately measure the soil dynamic elastic modulus E and Poisson’s ratio μ, the application of this formula can be calculated The required Cz value in the resistance model calculation model. This method is simpler and more convenient than the actual measurement basis C_z, and it is more practical than the “acceptable bearing capacity of soil” in the “Basic Specification for Power Machinery”. This paper also deduces the semi-empirical formula for calculating the depth of a finite elastic layer. It is pointed out that the influence depth of elastic deformation in soil under dynamic action is shallower than that under static force, and the dynamic stiffness is larger than the static stiffness (the bigger the foundation is, the more obvious). It is proposed that the elastic half-space calculation model is not practical. The disadvantages provide a reference for exploring the finite elastic layer calculation model.