化学腐蚀下砂岩三轴压缩力学效应的试验

Experiments on the Mechanical Effects of Sandstone with Chemical Erosion Under the Triaxial Compress

利用CT识别技术对化学腐蚀下的砂岩进行了三轴加载全过程的即时扫描试验 ,探讨了不同 pH值和不同化学溶液对砂岩强度的腐蚀影响 ,给出了砂岩应力应变曲线·实验结果表明 ,不同的环境对砂岩力学特性的影响是不同的 ,而且化学溶液酸性越强或碱性越强对砂岩的腐蚀性越大 ,所以 ,化学腐蚀是影响岩石力学特性的主要因素之一·该研究为分析砂岩损伤扩展的细观机理和损伤本构模型的建立提供了重要基础 ,为更准确地评估和计算坝基、边坡、隧道等众多与水相关的岩石工程的安全性和稳定性提供有效的技术参数 。

Damage processes of sandstone with chemical erosion under the triaxial load were tested using CT technology. The influence of the solutions with different pH values and different components was investigated. Meanwhile stress strain curve of sandstone was also obtained. The experimental results show that the influences of different environments on mechanical propertie of sandstone are different,the greater the acidity of solution the greater the erosion to sandstone,and so the chemical erosion is one of most important influence to rock mechanical properties. The results can be used as a reference to analyze the meso mechanics of rock damage evolution,to set up the corresponding damage constitutive model, and to offer an effective parameter for exactly estimating the safety and stability of many rock engineering such as dam foundation, slope and tunnel which are related to water.