某水电站坝址区钙质砂砾岩溶蚀发育规律研究

Corrosion rules of calcareous sandy and gravelly rock at dam site of a hydropower station

分析了我国西南某水电站坝址区钙质砂砾岩溶蚀发育分布规律，并采取岩样进行了室内溶蚀试验．试验结果表明，砾岩和含砾砂岩不仅胶结物主要为钙质成分，30％～50％的砾石成分也为钙质，因此加强了岩体的可溶性；新鲜岩石表面最容易受溶蚀，且溶蚀速度较快．这与现场调查和钻孔岩芯统计裂隙表面溶蚀风化程度最强，垂直裂隙面向岩石内部风化程度逐渐减弱的实际情况相一致．

The corrosion distribution rules of calcareous sandy and gravelly rock at the dam site of a hydropower station in the southeast of China were analyzed, and the laboratory tests on the corrosion of rock samples were done. The test results show that not only the agglutination of the sandy and gravelly rock is calcareous but also 30% - 50% of the gravel is calcareous, so the dissolubility of the rock is strong. The fresh rock surface is easily corroded, and the corrosion rate is fast. The test results agree well with the field investigation and the statistics of borehole rock cores, that is, the corrosion degree of the fresh rock surface is most severe, and the weathering degree from the fracture surface to the interior rock matrix gradually decreases.