Softening mechanism and characteristics of mudstone after absorbing moisture

软化 水分 机制(生物学) 地质学 材料科学 岩土工程 矿物学 复合材料 地球化学 物理 量子力学
作者
Jiawen Tang,Tianli Lan,Yuanming Lai,Ming Li,Qinguo Ma
出处
期刊:Applied Clay Science [Elsevier]
卷期号:254: 107398-107398 被引量:2
标识
DOI:10.1016/j.clay.2024.107398
摘要

Mudstone is formed of weakly consolidated clay through moderate epigenesis. Its strength significantly deteriorates after absorbing moisture, which seriously impacts the safety and stability of engineering facilities. It is imperative to investigate the softening mechanism and characteristics of mudstone exposed to water for the infrastructure in mudstone strata. In this study, the softening mechanism of mudstone after absorbing moisture was revealed through mineral composition test and scanning electron microscopy (SEM), and the softening characteristics were analyzed by uniaxial compression test and a novel statistical damage constitutive model. The results show that dissolution and chemical reaction of the active chemical components and clay minerals are the internal factors of mudstone softening after absorbing moisture. The deterioration of mechanical property is attributed to the combined effects of water erosion and wedge, and water erosion and wedge action coexist and interact. The stress-strain curves of mudstone with different moisture contents under uniaxial compression are typical plastic-elastic-plastic curves, forming an S shape. As moisture content increases, the stress-strain curve becomes flatter, the failure mode shifts gradually from splitting failure to shear failure, and the plastic deformation degree increases. The statistical damage constitutive model based on the Drucker-Prager criterion and Weibull distribution can describe the entire softening and failure process of mudstone after absorbing moisture. The impact of moisture content on the stress-strain curve can be well reflected by the correlation equations between moisture content and the parameters of the constitutive model.
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