考虑初始结构性影响的吹填软土应力应变关系

摘要

Normal sedimentary soil generally has the characteristics of original structures.Up to now,the most soil constitutive models are developed and built up based on the non-structure soils.If they are directly used to describe stress-strain relations of structure soils,a great difference can be produced between the measured value and the calculated value.This paper is based on the modified Cambridge model.The stress-strain relationship is established considering the influence of original structure property of the structural soft dredger fill.Compared with the modified Cambridge model,the new model only increases the number of parameters.They can be obtained through the conventional triaxial test.The types of parameters are unchanged.The triaxial compression test are conducted of the structural dredger fill which are treated by vacuum preloading method in Tianjin Binhai new area.Compared with the test value and the simulation value,the new model can consider the effect of original structural impact.%正常沉积的土体一般具有结构性。目前土的本构模型大多数是以非结构性土为基础建立和发展起来的，用它们直接描述结构性土体应力应变关系与实际出入很大。本文以修正的剑桥模型为基础，建立了可考虑初始结构性影响的结构性吹填软土应力应变关系。与修正的剑桥模型相比，只增加了参数的个数，但参数种类不变，其值通过室内常规试验即可求得。对天津滨海新区吹填场地经过真空预压处理后有结构强度的吹填土体进行了三轴试验，通过试验值与模拟值分析比较，初步验证了本文建立的模型可以考虑吹填软土初始结构性影响。