摘要
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。
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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第1期20-29,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40672192
50479072)
国家自然科学基金重点项目(50539090)
湖北省自然科学基金项目(2007ABB040)
关键词
岩石力学
砂岩
弹塑性力学特性
水物理化学作用
试验研究
损伤分析
本构模型
rock mechanics
sandstone
elastoplastic mechanical behaviors
hydro-physicochemical effects
experimental study
damage analysis
constitutive model
