泥岩在受热过程中的应力、应变、孔压变化有特殊的规律，此研究对能源、核能、土木等诸多方面均有重要意义。目前国内的实验和模型研究很少，而国外的学者通过在黏土的修正剑桥模型的基础上引入温度变量，成功地提出了黏土的热弹塑性本构模型。通过对现有的黏土本构模型进行对比计算，并在此基础上进行发展，得出可以应用于泥岩的热弹塑性本构模型。进而，将新疆某稠油油田泥岩夹层数据代入该模型进行计算，获得了其孔隙压力和轴向应变预测结果，该结果国外同类实验结果较好地吻合。运用孔隙压力升高造成张失效这一原理，模型预测出了不同孔隙度泥岩的失效温度。同时，结合温度场公式，模型一判断SAGD开采时储层中泥岩夹层的失效位置和时间。这方面研究对于稠油开采中的蒸汽辅助重力泄油（SAGD）时，受到夹层阻碍，抑制蒸汽腔扩展这一问题的解决有重要意义。“,”The studies on stress, strain and pore pressure of mudstone during heating are significant in many fields, such as heave oil recovery, nuclear waste storage and civil engineering. The literature investigation indicates that rare related works have been done in this area and ongoing studies still stay in infancy all over the world. To our knowledge, few experiments and models have been revealed in domestic research activities. While some thermo-elasto-plastic constitutive models are successfully created by introducing temperature effect into the modified clay-based Cambridge model. Here, a thermo-elasto-plastic model for mudstone is proposed, which is capable to simulate change of stress, strain and pore pressure under in-situ boundary conditions. Furthermore, inner bed mudstone data of Xinjiang’s heavy oil field are applied in this model. Results of pore pressure and axial strain are obtained, and they agree with those of foreign experiments. By using the function for temperature field during steam chamber expansion of SAGD, constitutive failure of mudstone with different saturations is forecast. The results can effectively solve the problem that the inner bed mudstone hinders the steam chamber expansion.