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因土体卸荷引起的工程问题与一般土工加载问题表现的特性明显不同,目前对土的卸荷应力—应变归一化特性研究并不深入。开展不同固结压力与卸荷比的K0固结剪切试验,探究卸荷条件下软土的变形规律,重点研究卸荷条件下软土的应力—应变归一化特性。结果表明,武汉软土卸荷变形特性与卸荷应力路径以及卸荷比关系密切,其应力—应变关系成双曲线关系,具有较高的非线性与归一化特性,这也使得应用邓肯—张模型去描述土的卸荷特性成为可能,该研究对于改进工程设计计算具有重要意义。
The engineering problems caused by soil unloading are obviously different from those of general geotechnical loading problems. At present, the research on the stress-strain normalization characteristics of soil is not in-depth. The K0 consolidation shear test with different consolidation pressure and unloading ratio was carried out to investigate the deformation of soft soil under unloading condition and to study the stress-strain normalization characteristics of soft soil under unloading condition. The results show that the deformation characteristics of unloading in soft soil of Wuhan are closely related to the unloading stress path and unloading ratio, the stress-strain relationship is hyperbolic, and has the characteristics of high nonlinearity and normalization. This makes the application of Duncan- It is possible to describe the unloading characteristics of soil by using the model, which is of great significance to improve the engineering design calculation.