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到目前为止,上海地区仍按常规方法计算地基变形。本文针对上海的亚砂土以拉德—邓肯模型为依据,利用常规三轴仪对苏州河北岸的两组土样,进行弹塑性应力—应变特性试验,并且研究确定有关参数的方法及其变化规律,指出拉德—邓肯模型的不足之处,计算的变形值与试验数据相当符合,为上海地区的砂类土采用弹塑性模型创造了条件。
So far, the Shanghai area still calculates the ground deformation according to the conventional method. In this paper, based on the Lad-Duncan model of subsand-sand in Shanghai, the elasto-plastic stress-strain behavior tests of two sets of soil samples on the northern bank of the Suzhou River are performed by using conventional triaxial apparatus, and the methods for determining the relevant parameters and their changes are studied. The law points out the inadequacies of the Lad-Duncan model. The calculated deformation values are in good agreement with the experimental data, creating the conditions for using the elasto-plastic model for the sandy soils in Shanghai.