科研之友
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摘要
Purple soil is the most common soil in the Three Gorges Reservoir area. It is easily eroded and transported by water and deposited. Affected by farming, fertilization and environmental pollution, purple sedimentary soil often contained a large number of heavy metal ions. To clarify the change laws of evaporation, linear shrinkage and resistivity during the drying shrinkage process, the typical purple sedimentary soil was selected, and the effects of different drying time and metal salt content on evaporation, linear shrinkage and resistivity were analyzed. The results show that the linear shrinkage and evaporation increased rapidly in the early stage and tended to be stable in the later stage. The increase of salt content in the early stage had an inhibitory effect on evaporation and linear shrinkage. The difference was that in the later stage, affected by salt content, the final evaporation tended to be unified, and the final linear shrinkage decreased with the increase of salt content. Finally, with the increase of drying time, the resistivity increased gently in the initial stage, the middle part increased rapidly, and then tended to be stable due to the complete evaporation. Furthermore, a simplified model between evaporation, linear shrinkage and resistivity was proposed.
