摘要
通过砂岩在不同水化学溶液中浸泡后的常规三轴压缩试验,对比分析受不同pH值、不同浓度和不同化学成分的化学溶液腐蚀后砂岩的变形特性、强度特性及其微细观结构特征,并监测化学溶液中Ca2+,Mg2+离子浓度的变化规律,初步探讨砂岩试样的水化学腐蚀机制。试验结果表明:化学腐蚀后,砂岩试样有从脆性向延性转化的趋势;砂岩的力学参数均有不同程度的降低,并且,砂岩力学参数的劣化程度与其物理化学参数之间存在密切的关系,试样的孔隙率或纵波波速变化越大,或溶出的离子浓度越多,其力学参数的降低程度越大。引入新的损伤参量来定量地表达试样力学参数随水化学损伤的演化过程。
The triaxial compression tests of sandstone sample soaked in different water chemical solutions are carried out. The effects of different pH values,different concentrations and different chemical compositions of chemical solution on deformation parameter,strength parameter and its microstructure are investigated,and the change regulation of Ca2+and Mg2+concentration of chemical solution are monitored,at the same time,the mechanism of hydrochemical damage to sandstone sample is discussed. The experimental results show that chemical corrosion results in the transformation of brittle failure to ductile failure of sandstone. The mechanical parameters of sandstone are reduced,and the degradation of mechanical parameters of sandstone is related to its physico-chemical parameters,the greater change of its porosity or longitudinal wave,or the greater the ion concentration from sandstone sample,the greater degradation of mechanical parameters. A new variable is introduced to quantitatively express the hydrochemical damage process of physico-mechanical parameters of sandstone samples.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期3064-3072,共9页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
砂岩
水化学腐蚀
细观化学损伤变量
孔隙率
黏聚力
内摩擦角
rock mechanics
sandstone
hydrochemical erosion
meso-chemical damage variable
porosity
cohesion
internal friction angle
