AMD蚀化砂岩细观力学效应

通过pH值为1.25，3.38的AMD溶液蚀化下砂岩细观结构及力学试验，分析砂岩细观结构及力学性质变化规律；运用分形理论描述砂岩细观结构分布特征，得到AMD蚀化下砂岩表面SEM图像的分形维数（D）；基于砂岩弹性模量的变化，引入AMD蚀化下砂岩化学损伤变量（w），建立w与 D 之间的关系。结果表明：AMD蚀化下砂岩细观结构分布具有分形特征， w 与 D 存在较好的线性关系。pH=1.25时， w=0.78D－1.62；pH=3.38时， w=0.97D－2.04，相关系数均在0.98以上。研究结果从细观层次揭示了AMD蚀化砂岩力学效应。

Mesoscopic mechanical effect on sandstone corroded by acid mine drainage

Through meso tests and mechanical tests of sandstone corroded by AMD solution with pH values of 1.25 and 3.38,the change rules of meso structure and mechanics characteristic of sandstone were analyzed.Fractal theory was applied to describe the distribution of the meso structure and fractal dimensions(D) of SEM image of sandstone by AMD were obtained.A chemical damage variable(w) was introduced based on the variety of elastic modulus,and the relationship between w and D was established.The results show that it has fractal characteristics,there is linear correlation between w and D,while pH value of AMD solution is 1.25,w=0.78D－1.62,while pH value is 3.38,w=0.97D－2.04. The linear coefficient between w and D is higher than 0.98.The mechanical effect of sandstone by AMD is revealed on meso level.