酸雨环境下砂岩的物理化学性质变化规律分析  

Regularity analysis on corrosion progressive and physical-chemical characteristic of sandstone subjected to Acid Rain

作　　者：霍润科[1] 李静[1] 辛宏伟[1] 王博[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2016年第2期165-170,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41172237);陕西省教育厅专项基金资助项目(11JK0947)

摘　　要：模拟室内加速腐蚀试验,研究了砂岩腐蚀不同阶段的物理力学性质变化规律及化学腐蚀机理,用定义的质量损失率、孔隙率和纵波波速来描述砂岩与不同浓度HCl溶液反应的快慢程度并相互验证.试验结果表明,随浸泡时间延续质量损失率、孔隙率及纵波波速的关系呈现出阶段性特征,第40 d时pH=2、pH=3.5及pH=5的酸溶液中质量损失率分别达到最大值为0.432%、0.405%和0.281%;在0~30 d岩样孔隙产生较明显,纵波波速变化率也较大,30 d之后岩样孔隙率增加缓慢,随之波速增加也较缓慢最终趋于平稳;第一阶段pH=2溶液中Na^+离子溶解速率在初期最大为264.78 mol/d,pH=3.5及pH=5溶液Na^+离子溶解速率在中期达到最大值,分别为102.28 mol/d和79.67 mol/d,pH=2的HCl溶液中Ca^(2+)溶解速率最大为489.50mol/d,分别是pH=3.5及PH=5溶液中Ca^(2+)溶解速率的5倍和4倍.Simulated indoor accelerated corrosion tests to study chemical corrosion and the variation mechanism of physical-mechanical properties of sandstone at different stages.With the mass loss rate,porosity and P-wave velocity to describe reaction velocity in different concentrations of HCl solution and mutual authentication.The test results show that the relationship of the mass loss rate,porosity and P-wave velocity exhibit phase features with the immersion time.In 40 days the mass loss rate of PH=2,PH=3.5 and PH=5 acid solution reaches a maximum to 0.432%,0.405% and 0.281%;in 0~30 days the porosity of rock sample produces more obvious,changing of P-wave velocity rate is larger,after 30 days the porosity of rock sample increases slowly,P-wave velocity changes slowly and finally tends to smooth;the first stage,Na+ dissolution rate of PH=2 solution is up to 264.78 mol / d in the initial,Na+ dissolution rate of PH=3.5 and PH=5 solution reachs maximum respectively in the middle,102.28 mol/d and 79.67 mol/d,Ca^(2+) dissolution rate of PH=2 HCl solution is up to 489.50 mol/d,which is 5 times and 4 times in PH=3.5 and PH=5 solution.

关 键 词：砂岩试样 质量损失率 孔隙率 纵波波速 Na^+溶解速率 Ca2+溶解速率 

分 类 号：TU45[建筑科学—岩土工程]