Analysis of Gypsum Karst Erosion Characteristics in Complex Groundwater Environment
In order to analyze the characteristics of gypsum karst erosion in complex groundwater environment,the study simulates the groundwater flow environment through dry and wet cycle with a dry and wet cycle device.With water velocity as variable,a cylindrical gypsum rock sample with a diameter of 45 mm and a height of 120 mm is cycled through dry and wet treatment for 5 days,and the density and composition changes of gypsum rock are compared under water velocity of 0 L/h,5 L/h,10 L/h and 15 L/h.The results show that the density of gypsum rock decreases with the increase of groundwater velocity,and the integrity and composition of gypsum rock decrease gradually,indicating that the water velocity has an important effect on the karst erosion of gypsum.With the increase of water velocity,the karst erosion rate of gypsum increases gradually,especially at the stage of 10～15 L/h.Chemical corrosion is the main corrosion mechanism in still water or low flow rate environment,while mechanical erosion enhances significantly in high flow rate environment.It works with chemical corrosion to promote rock dissolution.
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