弱酸腐蚀下含孔砂岩动态压缩力学特性试验研究  

Dynamic compressive mechanical properties of porous sandstone specimens corroded by weak acids

作　　者：平琦[1] 胡薇 后健民 PING Qi;HU Wei;HOU Jian-min(School of Civil Engineering&Architecture,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《河南城建学院学报》2024年第6期1-7,34,共8页Journal of Henan University of Urban Construction

基　　金：国家自然科学基金项目(52074005,52074006);安徽省自然科学基金项目(1808085ME134);安徽省博士后基金项目(2015B058)。

摘　　要：为探究腐蚀作用时间对含孔砂岩试件动力学特性的影响规律,为地下工程安全提供参考,使用pH值为5的弱酸溶液对含孔砂岩试件进行1、3、5、7、14、21、28 d的腐蚀处理,测试其基本物理参数,利用SHPB试验装置进行冲击压缩试验获取动态力学参数。结果表明:弱酸溶液腐蚀含孔砂岩试件会导致质量损失、体积膨胀和密度减小,且这些劣化效应随时间增长而加剧;随腐蚀时间增长,含孔砂岩试件的动应力-应变曲线显示塑性变形阶段逐渐平缓,试件脆性减弱,延性增强;含孔砂岩试件的动抗压强度、动弹性模量和平均应变率等动力学参数随腐蚀时间增长而劣化。To investigate the effect of corrosion duration on the dynamic characteristics of porous sandstone specimens,a weak acid solution with a pH value of 5 was used to corrode the specimens for different durations of 1,3,5,7,14,21 and 28 days.The basic physical parameters were tested,and the dynamic mechanical parameters were obtained using a Split Hopkinson Pressure Bar(SHPB) test device for impact compression tests.The results indicate that the corrosion of the porous sandstone specimens by the weak acid solution leads to mass loss,volume expansion,and a decrease in density,and these degradation effects intensify with increasing time;with the increase in corrosion duration,the dynamic stress-strain curves of the porous sandstone specimens show a gradual flattening of the plastic deformation stage,indicating a reduction in brittleness and an enhancement in ductility;the dynamic compressive strength,dynamic elastic modulus,and average strain rate of the porous sandstone specimens deteriorate with increased corrosion time.

关 键 词：岩石动力学 弱酸溶液 腐蚀时间 含孔砂岩 冲击压缩 

分 类 号：TU458[建筑科学—岩土工程]