砂岩弹塑性力学特性的水物理化学作用效应—— 试验研究与本构模型

 针对干燥、饱水、蒸馏水以及不同离子浓度和pH值水溶液循环流动作用至水–岩反应平衡后的砂岩试件，开展一系列单轴压缩试验和CT损伤测试，获得这些不同状态及水溶液作用后砂岩试件的应力–应变关系全过程曲线和CT扫描结果；分别研究砂岩弹塑性力学特性包括应力–应变关系、弹性模量、峰值强度及残余强度的水物理作用和水化学作用效应与机制；基于CT检测结果开展相应的水物理化学损伤分析；在此基础上，通过分析水物理化学作用对砂岩应力–应变关系的影响特征与规律，探讨并采用改进的Duncan模型来描述存在水物理化学作用效应的砂岩非线性弹性变形行为。研究结果对于水–岩相互作用及相关领域的理论与应用研究，具有良好的促进与借鉴作用。

EXPERIMENTAL STUDIES AND CONSTITUTIVE MODEL OF ELASTOPLASTIC MECHANICAL BEHAVIORS OF SANDSTONE WITH HYDRO-PHYSICOCHEMICAL INFLUENCING EFFECTS

A series of uniaxial compression tests and computerized tomography(CT) scanning tests on dry，saturated sandstones，and the sandstones with hydro-physicochemical influencing effects due to the circulating flow of distilled water and different hydro-chemical solutions are conducted. The corresponding complete stress-strain curves and CT scanning results are obtained. The hydrophysical and hydrochemical influencing effects on the elastoplastic mechanical behaviors of sandstone，such as stress-strain relationship，elastic modulus，peak strength and residual strength are derived. The hydrophysical and hydrochemical influencing mechanisms of water-sandstone interaction are studied. The hydro-physicochemical damages of sandstones are analyzed based on the CT scanning results. The modified Duncan model is used to describe the mechanical behaviors of sandstones with different hydro-physicochemical influencing effects. This study has a useful reference to the theoretical and applied research in the field of water-rock interaction.