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通过分析软土结构性成因及压缩特点,采用五段折线模拟结构性原状软土压缩曲线,体现了欠压密片架结构软土的力学特点,且基本符合结构性土体的变形发展趋势。针对扰动软土提出虚拟前期固结压力的概念,指出变形初期扰动土体的受力变形可由结构性部分受力变形和损伤部分受力变形的线性组合表示。算例分析显示相同扰动度情况下,高堆载所引起的扰动附加变形比低堆载所引起的扰动附加变形大得多。本文所建议的扰动附加沉降计算模型对工程实践有一定的参考价值。
By analyzing the structural causes and compressive characteristics of soft clay, the five-stage fold line is used to simulate the compression curve of structural intact soft soil, which reflects the mechanical characteristics of soft clay under-pressured frame structure and basically meets the deformation trend of structural soil. According to the concept of soft pre-consolidation pressure for disturbed soft soil, it is pointed out that the deformation of disturbed soil can be expressed by the linear combination of structural deformation and damage partial deformation. The case study shows that under the condition of the same disturbance, the additional deformation of the disturbance caused by the high load is much larger than the additional deformation of the disturbance caused by the low load. The proposed additional settlement calculation model of disturbance has some reference value to engineering practice.