摘要
采用室内模拟试验研究酸雨腐蚀对大理岩单轴压缩特性的影响。将大理岩岩样浸泡在封闭的模拟酸雨溶液中,在浸泡时间和温度相同的条件下,改变酸雨溶液的pH;在pH相同的条件下,改变酸雨溶液的温度。通过测定不同时间的酸雨溶液电导率、反应后浸泡溶液的钙离子浓度,分析pH和温度变化对大理岩与酸雨溶液之间化学反应的影响。将浸泡后的大理岩岩样进行单轴压缩试验,分析模拟酸雨对大理岩单轴抗压强度和破坏方式的影响。试验结果表明:在酸雨溶液中浸泡后,大理岩破坏时的脆性程度减弱;室温时,随着浸泡溶液的pH降低,大理岩和酸雨溶液反应更加充分,大理岩单轴抗压强度降低;但当温度为80℃时,大理岩单轴抗压强度随着pH的降低反而明显增大;随着酸雨溶液温度的增加,化学反应速度加快,反应达到稳定的时间缩短,短期内单轴抗压强度比室温时明显降低。
Indoor simulation test was conducted to study the effects of acid rain attack on uniaxial compression properties of marble.The marble specimens were soaked in enclosed simulated acid rain solution.With the same soak time and temperature,the pH value of the acid rain solution was changed;when keep the same pH value,the temperature of acid rain solution was changed.The conductivity of acid rain at different time and the concentration of calcium ion in acid rain solution after chemical reaction were inspected to analyze the influence of pH value and temperature on the chemical reaction between the marble and the acid rain solution.In order to analyze the consequent influence on uniaxial compression strength of marble,uniaxial compression test was carried on the marble specimens after soaking.The test results show that the brittle property of failure weakens by soaking the specimen in a simulated acid rain solution.At room temperature,with the decrease of pH of soaking solution,the marble and acid rain solution react more fully and the uniaxial compressive strength of marble decreases.While the temperature is 80 ℃,the uniaxial compressive strength of marble increases with the decrease of the pH of soaking solution.It also shows that with the increase of the temperature of acid rain solution,the chemical reactions accelerate and the time to reach a stable state shortens,as a result,comparing with the condition of room temperature,the uniaxial compression strength reduces significantly in a short time.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第7期2897-2902,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(41102176)
中央高校科研业务费专项资金资助项目(2013G1261056)
关键词
模拟酸雨
大理岩
PH
电导率
单轴抗压强度
stimulated acid rain
marble
pH
conductivity
uniaxial compression strength
