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压实土在岩土工程中被广泛应用。为了确保压实土体的稳定性,需要很好地掌握此类土在水—力耦合作用下的体积变化特性。通常采用有限元分析原理来评估压实土在水—力耦合作用下的压缩特性。目前大多数的有限元模型使用全应力来计算压缩应变,忽略了一个重要的非饱和力学变量,即压缩过程中的吸力变化。本文通过分析压缩试验中压实土吸力的变化来评估总应力假设的可行性,证实土的结构和初始条件对吸力变化的影响,分析可能反映吸力变化的各种指示参数,例如土的先期固结应力σp和饱和度Sr。
Compacted soil is widely used in geotechnical engineering. In order to ensure the stability of compacted soils, it is necessary to know well the volume change characteristics of such soils under water-power coupling. The principle of finite element analysis is usually used to evaluate the compressibility of compacted soil under water-mechanical coupling. At present, most of the finite element models use full stress to calculate compressive strain, neglecting an important variable of unsaturated mechanics, that is, the change of suction during compression. In this paper, the feasibility of the total stress assumption is evaluated by analyzing the changes of compaction soil suction in the compression test. The influence of soil structure and initial conditions on the suction variation is verified. Various indication parameters that may reflect changes in suction are analyzed, for example, Junction stress σp and saturation Sr.