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选取三峡库区某边坡的泥质砂岩为研究对象,分别对pH=3和pH=7溶液下干、湿循环作用的泥质砂岩进行电镜扫描试验(SEM)、4种围压下的三轴压缩试验,通过MATLAB软件处理得到不同pH值和干、湿循环次数下SEM图像的骨架面积比和分形维数。研究表明:在相同的干、湿循环次数下,pH=3酸性环境下的分形维数比p H=7的要大;分形维数与吸水率成正比例相关;与骨架面积、凝聚力成反比例相关;泥质砂岩在干、湿循环作用下的临界骨架面积比为0.55左右;提出了泥质砂岩在干、湿循环作用下的侵蚀度概念,计算并拟合了泥质砂岩的侵蚀度随干、湿循环次数变化的关系曲线;推导出凝聚力的损伤变量公式,为研究不同pH水环境对岩石的侵蚀作用提供参考依据。
The shale sandstone of a slope in the Three Gorges Reservoir Area was selected as the research object. Electron microscopy (SEM) was carried out on the shaly sand with wet and dry cycles under pH = 3 and pH = 7, respectively. Axial compression test was carried out by MATLAB software to get the skeleton area ratio and fractal dimension of SEM images under different pH values and dry and wet cycles. The results show that the fractal dimension of acidic environment with pH = 3 is larger than that of p H = 7 under the same dry and wet cycles, the fractal dimension is directly proportional to the water absorption, and inversely proportional to the area and cohesion ; The critical skeleton area ratio of shaly sand under dry and wet cycles is about 0.55; the concept of the aggressiveness of shaly sand under dry and wet cycles is proposed; and the erosion degree of shaly sand is calculated and fitted with , The number of cycles of wet cycles, and deduced the formula of damage variables of cohesion, which provide a reference for studying the erosion effect of rocks under different pH-water environment.