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天然地基中土是在某种约束下而受力变形的,试验结果表明,土在等应变增量比的路径约束下,无论应力路径的起点如何最终都会逼近于应力比为一常数的稳定状态,称为渐近状态。简要分析了渐近状态下土的剪胀规律,应变增量比作为反映剪胀性的一个参数,可以用来描述渐近状态应力比,结合广义非线性强度准则,把土渐近状态应力比的计算推广到三维,提出了土的三维渐近状态准则,并详细分析了该准则中各参数对渐近状态应力比的影响程度,最后通过试验验证了准则的有效性。
The results show that under the constraint of equal strain increment ratio, the soil will eventually approach a steady state with constant stress ratio regardless of the starting point of the stress path , Called asymptotic state. The law of dilatancy of soil under asymptotic condition is briefly analyzed. As a parameter reflecting dilatancy, strain-increment ratio can be used to describe asymptotic state stress ratio. Combined with generalized nonlinear strength criterion, the soil asymptotic state stress ratio The three-dimensional asymptotic state criterion of soil is proposed and the degree of influence of each parameter on the asymptotic state stress ratio is analyzed in detail. Finally, the validity of the criterion is verified through experiments.