粘性土地基在动荷载作用下变形分析

Deformation analysis of clay soil foundation under dynamic load

通过室内模型试验从宏观与微观结构讨论了粘性土地基分别在静载、动载作用下横向位移、竖向位移随深度的变化规律、地基应变与最大剪应变分布。分析研究了粘性土微结构动态环境能场、外部环境条件变化与其内在介质环境变化之间的密切关联。结果表明,动载比静载作用下的位移、应变、剪应变大得多,特别是对地基的浅表处影响不仅范围大而且深度加大。试验结果还表明偏湿土和受振动的土击数越多,对土的初始结构损伤越厉害,但土的后期结构强度有所提高。

Based on the macrostructure and microstructure of clay soil, the lateral and vertical displacement variation with depth, the distribution of strain and maximum shear strain of clay soil foundation under static and dynamic loads were performed by laboratory model tests. The interrelationship between the dynamic environmental energyfield of the microstructure, and the change of external environmental condition and medium grain interlocking of clay soil are studied. The results are shown that the displacement, strain and shear strain of the clay soil foundation under the dynamic loads are larger than those under the static loads. Especially for the surface layer of the foundation the effects are not only bigger in range but increased in depth. The results of experiments are also shown that the damage of initial soil structure is increased with the blow count of more wet soil and vibrated soil, but the later stage strength of the soil is increased a little.