Abstract To investigate the stress-strain relationship of municipal solid waste incineration bottom ash (MSWIBA), taking MSWIBA samples with a dry density of ρd = 1.5 g/cm3 as examples, a series of consolidated drained triaxial tests were carried out on MSWIBA. The test results showed that the stress-strain relationship of MSWIBA showed an obvious strain softening phenomenon when their curing ages and confining pressure were relatively small, and the stress-strain relationship showed an obvious strain hardening phenomenon when the curing ages and confining pressure were large. The improved Duncan-Chang model can reflect the strain softening and strain hardening phenomenon of MSWIBA. There is a transformation phenomenon of the stress-strain relationship in MSWIBA, and the curing age and confining pressure are the main influencing factors of its transformation phenomenon. The ‘postfailure modulus’ was proposed to distinguish the transformation phenomenon of MSWIBA, and its transformation mechanism was analyzed in detail. A practical stress-strain relation model is proposed for MSWIBA, which can take into account the transformation phenomenon. Moreover, the patterns of the stress-strain relationship were identified based on the critical confining pressure.

中文翻译：

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城市生活垃圾焚烧底灰应力应变关系研究

摘要 为研究城市生活垃圾焚烧底灰（MSWIBA）的应力应变关系，以干密度ρd=1.5 g/cm3的MSWIBA样品为例，对MSWIBA进行了一系列固结排水三轴试验。试验结果表明，MSWIBA的应力应变关系在其固化龄期和围压较小时表现出明显的应变软化现象，而在固化龄期和围压较大时，应力应变关系表现出明显的应变硬化现象。 . 改进后的 Duncan-Chang 模型可以反映 MSWIBA 的应变软化和应变硬化现象。MSWIBA中存在应力应变关系的转换现象，养护龄期和围压是其转变现象的主要影响因素。提出了“失效后模量”来区分MSWIBA的转变现象，并详细分析了其转变机制。针对MSWIBA提出了一种实用的应力-应变关系模型，该模型可以考虑转换现象。此外，基于临界围压确定了应力-应变关系的模式。