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在深部高应力和水化学作用下,已损伤泥岩中的裂隙会自我愈合从而恢复其物理力学性能,泥岩的这一特性对以泥岩为母岩的高放废物处置库的围岩稳定性及其中放射性核素的迁移和隔离影响重大。根据广义热力学和连续损伤力学,基于最大耗散原理,引入描述泥岩愈合特性的内变量,提出能够描述泥岩的变形、损伤及自愈合演化特征的弹塑性损伤–愈合模型,分别使用该模型和将该模型剔除愈合部分后所形成的模型对不同围压下泥岩三轴压缩试验进行模拟,并与试验数据进行对比,结果表明所提出的模型能够合理有效地描述具有愈合效应的泥岩的主要力学性质且模型的愈合部分对模型模拟效果影响显著。
Under the conditions of deep high stress and water chemistry, the fractures in the damaged mudstone self-heal to restore its physical and mechanical properties. This characteristic of mudstone is the key to the stability of the surrounding rock of the HLW reservoir with mudstone as parent rock and The migration and isolation of radionuclides have a significant impact. According to the generalized thermodynamics and the continuous damage mechanics, based on the principle of maximum dissipation, the internal variables describing the healing characteristics of mudstone are introduced, and the elastoplastic damage-healing model describing the deformation, damage and self-healing evolution of mudstone is proposed. Comparing the model with the experimental data, the results show that the proposed model can reasonably and effectively describe the main mechanics of mudstone with healing effect The nature and the healing part of the model have a significant effect on the model simulation.