结构性软黏土损伤变量与扰动度的相关性研究

发布时间：2018-04-12 21:45

本文选题：结构性软黏土 + 应力状态　；参考：《岩土力学》2015年04期

【摘要】：取样与施工过程会对天然沉积结构性软黏土产生扰动,使土体的工程性质发生演化,一些学者分别以扰动度和损伤变量两个特征参数对该问题进行了较为深入的研究,但扰动度与描述土体应力状态的损伤变量之间的相关性目前仍未明晰。为此,以连云港天然沉积结构性软黏土进行不同应力路径下快速加载试验模拟土体应力损伤,对损伤后土体进行固结试验和无侧限抗压强度试验,结合张孟喜提出的损伤变量以及两种常用的扰动度(变形和强度)的定义,评价了损伤后土体的损伤变量和扰动度,探讨二者间关系。结果表明,损伤后土体压缩曲线屈服前的斜率并未产生明显改变,即损伤变量与按变形定义的扰动度间关系不明显;而损伤变量与以强度定义的扰动度之间存在线性递增关系,说明了当土体沿着某一路径加载时,越接近破坏线,其损伤程度越高,土体的强度也随之降低。
[Abstract]:Sampling and construction will disturb the natural sedimentary structural soft clay and make the engineering properties of the soil evolve. Some scholars have studied the problem with two characteristic parameters of disturbance degree and damage variable respectively.However, the correlation between disturbance degree and damage variables describing the stress state of soil is still unclear.Therefore, the natural sedimentary soft clay in Lianyungang was used to simulate the stress damage of soil under different stress paths, and the consolidation test and unconfined compressive strength test were carried out on the damaged soil.Combined with the definition of damage variable and two kinds of disturbance degree (deformation and strength) put forward by Zhang Mengxi, the damage variable and disturbance degree of damaged soil are evaluated and the relationship between them is discussed.The results show that the slope before the yield of the soil compression curve does not change obviously, that is, the relationship between the damage variable and the disturbance degree defined by deformation is not obvious, but there is a linear increasing relationship between the damage variable and the disturbance degree defined by strength.It is shown that when the soil is loaded along a certain path, the closer it is to the failure line, the higher the damage degree is and the lower the strength of the soil is.
【作者单位】：东南大学交通学院岩土工程研究所;
【基金】：国家自然科学基金(No.50908049,51378117)
【分类号】：TU43

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