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近几年来,作者在对土的动性能所作的多次实验中,发现匀质土中弹性波的传播速度(V)、剪切模量(G)、地基抗压刚度系数(Cz)有随土层深度而变化的现象。针对这一现象,又系统地对黄土状亚粘土、湿陷性黄土、砂性土、淤泥及淤泥质土、砾石等进行了现场实验.实验结果表明:匀质土中弹性波的传播速度、剪切模量、地基抗压刚度系数均随土层深度增加而增大;不同性质的土层,其变化规律亦异.本文介绍了上述实验结果,并从土力学的观点对剪切模量随深度变化的抗压刚度系数进行了理论分析.通过所做的实验和分析,作者认为目前在设计动力机器基础时,将地基土的弹性系数(E、G)、地基抗压刚度系数(Cz)视作与深度无关的常量,需要重新考虑.
In recent years, the authors have found that the propagation velocity (V), shear modulus (G), and compressive rigidity coefficient (Cz) of elastic waves in homogeneous soils have been accompanied by many experiments on soil dynamic properties. The depth of the soil changes. In response to this phenomenon, field experiments were carried out systematically on loess-like sub-clay, collapsible loess, sandy soil, silt, silty soil, and gravel. The experimental results showed that: the propagation speed of elastic waves in a homogeneous soil, The shear modulus and compressive stiffness coefficient of foundation increase with the depth of soil layer. The soil layers with different properties also have different variation rules. This paper introduces the above experimental results, and from the point of view of soil mechanics to the shear modulus. The theoretical analysis of compressive stiffness coefficient with depth changes. Through the experiments and analysis, the author thinks that when designing the foundation of power machine, the elastic coefficient (E, G) of the foundation soil and the compression stiffness coefficient of the foundation (Cz) ) As a constant that has nothing to do with depth, it needs to be reconsidered.