摘要
通过对不同水化学溶液浸泡后砂岩物理力学性质的试验研究,对比分析了溶液pH值、浓度及水化学成分对砂岩的腐蚀程度,初步探讨了砂岩试样的水化学腐蚀机理。试验结果表明:经化学腐蚀后砂岩的脆性减弱延性增强,而对砂岩侧向变形的影响规律并不明显;砂岩力学参数降低的劣化程度与溶液中溶出离子浓度的大小存在一定的对应关系,亦即溶液中溶出的离子浓度越高,砂岩力学参数降低程度越大;可以用砂岩的纵波波速来反映其内部孔隙率的变化情况,由于纵波波速的测试不会对砂岩产生损伤,因此可以对同一试样进行不同腐蚀作用时间的纵波波速测试,从而避免了岩石不均匀性所带来的误差。
The physical characteristics of sandstone specimens soaked in different hydrochemical environments are studied.The effects of pH、concentration and composition of chemical solution on the corrosiveness of sandstone specimens are evaluated;and its mechanism of hydrochemical damage of sandstone specimen is discussed.The test results show that chemical corrosion results in the transformation of brittle failure to ductile failure of sandstone,but its influence on radial deformation of sandstone is not obvious.The degradation of mechanical parameters is related to a certain quantity of the sandstones of different kinds; the greater the ion concentration dissolved from specimens,the higher degradation of mechanical parameters.Longitudinal wave can be used to characterize the change of internal porosity of sandstone largely owing to the fact that the test of longitudinal wave speed does not produce any damage to sandstone,the Longitudinal wave of the same sandstone specimen can be tested under different corrosion time to avoid errors brought by the rock inhomogeneity.
出处
《西安理工大学学报》
CAS
北大核心
2014年第1期34-39,共6页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51269024)
关键词
砂岩
水化学腐蚀
孔隙率
腐蚀机理
sandstone
chemical erosion
porosity
corrosion mechanism
