Coupled thermo–hydro-mechanical (THM) models are used for the assessment of nuclear waste disposal, reservoir engineering, and many other branches of geotechnical engineering. Model-based decision making and optimization often entail sensitivity analyses (SA) and uncertainty quantification (UQ). The suitability of different UQ and SA methods for coupled THM problems on an engineering scale requires clarification. To provide such guidance without the need for large numerical studies, an analytical solution of a simple THM problem is employed here that encompasses the most relevant primary couplings, can robustly cover the entire parameter space, and remains computationally inexpensive. Both local (OVAT) and global sensitivity analysis (GSA) techniques are applied to the study of the THM model. The information that can be derived from the different approaches is then systematically assessed, such as parameters and interactions that control selected observation quantities and how their effect varies in both space and time. We provide application-oriented conclusions on the conditions which should be met when applying the different methods as well as examples for possible misinterpretations. The analysis can serve as a benchmark for UQ and SA software designed around numerical THM simulators. This work may also serve as an attempt to highlight the methodology and effectiveness of SA to the audience from an engineering background.

热-水力-机械（THM）耦合模型用于评估核废料处置，储层工程以及岩土工程的许多其他分支。基于模型的决策和优化通常需要敏感性分析（SA）和不确定性量化（UQ）。需要澄清不同的UQ和SA方法在工程规模上对耦合THM问题的适用性。为了无需大型数值研究即可提供此类指导，此处采用了一个简单的THM问题的解析解决方案，该解决方案包含最相关的主耦合，可以稳健地覆盖整个参数空间，并且在计算上不昂贵。局部（OVAT）和全局敏感性分析（GSA）技术都应用于THM模型的研究。然后，可以系统地评估可从不同方法获得的信息，例如控制选定观测量的参数和相互作用以及它们的影响在空间和时间上如何变化。我们提供了应用不同方法时应满足的条件的面向应用的结论，以及可能引起误解的示例。该分析可以作为围绕数字THM模拟器设计的UQ和SA软件的基准。这项工作还可以作为从工程背景向听众强调SA的方法论和有效性的尝试。我们提供了应用不同方法时应满足的条件的面向应用的结论，以及可能引起误解的示例。该分析可以作为围绕数字THM模拟器设计的UQ和SA软件的基准。这项工作还可以作为从工程背景向听众强调SA的方法论和有效性的尝试。我们提供了应用不同方法时应满足的条件的面向应用的结论，以及可能引起误解的示例。该分析可以作为围绕数字THM模拟器设计的UQ和SA软件的基准。这项工作还可以作为从工程背景向听众强调SA的方法论和有效性的尝试。