基于下加载面概念的饱和黏土温度–应力耦合弹塑性模型

doi:10.13722/j.cnki.jrme.2014.1238

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Abstract The coupled thermo-mechanical behavior of saturated clays is summarized，including the temperature effects on volume change，pore pressure，preconsolidation pressure，strength and elastic modulus. Based on the experimental results，a thermal yield surface is introduced to describe the temperature-induced reversible and irreversible volume change of saturated clay. A subloading surface model was extended to consider the temperature effects was established. The extended model can depict the decrease of preconsolidation pressure of overconsolidated clay and the hardening of yield surface by temperature-induced plastic strain. The model was then proved to strictly satisfy the thermodynamic theorems. With the developed model，numerical simulations of drained heating tests，drained and undrained triaxial compression tests of clay with different OCR under different temperature are performed. The simulated results was compared with existing test results，which shows that the model can describe the volume change induced by temperature change，the thermal softening effect on overconsolidated clay and thermal hardening effect of normally consolidated clay.

Key words： saturated clay subloading surface temperature yield surface overconsolidated clay thermodynamics

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1238 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I7/11

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