The mechanical behavior of expansive soils varies according to the chemical composition of the pore fluid. It is well known that electrochemical phenomena on the surface of clay mineral crystals considerably affect their macrostructural behavior. In particular, a change in the pore fluid composition causes osmotic consolidation or swelling. In this study, a model is constructed to describe the characteristic behavior of expansive soils by coupling the interlaminar behavior of clay mineral crystals and the soil skeleton behavior. The interlaminar behavior is derived from the electro‐chemo‐mechanical coupling equilibrium of mineral crystals, and the soil skeleton behavior is given by a general elastoplastic constitutive model for soils. This modeling approach extends a general model to consider the electro‐chemo‐mechanical phenomena of mineral crystals. Oedometer tests with the replacement of the cell fluid and the swelling pressure and deformation tests on expansive clays are simulated with the proposed model. The simulation results indicate that the proposed method can reasonably represent the typical behavior of expansive soils.

中文翻译：

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一种扩展本构模型以考虑膨胀土中矿物晶体的电化学机制的方法

膨胀土的机械行为根据孔隙流体的化学成分而变化。众所周知，粘土矿物晶体表面的电化学现象会极大地影响其宏观结构行为。特别地，孔隙流体组成的变化引起渗透固结或溶胀。在这项研究中，通过耦合粘土矿物晶体的层间行为和土壤骨架行为，构造了一个模型来描述膨胀土的特征行为。层间行为是由矿物晶体的电-化学-机械耦合平衡得出的，而土壤骨架的行为是由土壤的一般弹塑性本构模型给出的。这种建模方法扩展了一般模型，以考虑矿物晶体的电化学机制现象。用所提出的模型模拟了用细胞液代替的里程表测试以及膨胀粘土的膨胀压力和变形测试。仿真结果表明，该方法可以合理地代表膨胀土的典型行为。