We investigated the applicability of a thermo-elasto-plastic model using a TOUGH2-MP/FLAC3D simulator to reproduce the coupled hydro-mechanical behaviour at the engineered barrier emplacement experiment in Opalinus Clay and the coupled thermo-hydro-mechanical behaviour at the full-scale engineered barrier experiment in a crystalline host rock, as part of the DECOVALEX-2019 project Task D. In the numerical models, we adopted Darcy's law, Fick's law, and Fourier's law for the advective flux of fluid, vapour diffusion, and conductive heat flux, respectively. We also used the mechanical constitutive law, which explicitly considers the effects of temperature, pore pressure, suction, and strain changes using the elastic model and the Barcelona basic model. In general, the numerical models in the simulator successfully represented the coupled behaviour in bentonite buffer materials at the two long-term in situ experiments in terms of evolution and spatial distribution for temperature, relative humidity, total stress, and displacement. The performance of the models for the dismantling of the in-situ experiments is globally satisfactory compared with the post-mortem results for saturations, water contents, and dry density.

我们使用TOUGH2-MP / FLAC3D仿真器研究了热弹塑性模型的适用性，以在Opalinus黏土的工程化屏障放置实验中重现耦合的水力-力学行为，并在完整的模型中重现了耦合的热-水-力学行为。作为DECOVALEX-2019项目Task D的一部分，在晶体基质岩石中进行大规模工程屏障实验。在数值模型中，我们采用了达西定律，菲克定律和傅里叶定律进行流体，蒸汽扩散和传导热的对流通量通量。我们还使用了机械本构定律，该定律使用弹性模型和Barcelona基本模型明确考虑了温度，孔隙压力，吸力和应变变化的影响。大体，在温度，相对湿度，总应力和位移的演化和空间分布方面进行原位实验。与针对饱和度，水含量和干密度的验尸结果相比，用于原位实验拆除的模型的性能总体上令人满意。