红土中含铁离子物质的化学行为与力学效应

Chemical action and mechanical effect of the material with abundant iron ion in red soils

首先从地球化学理论上分析了铁离子的化学行为力学效应及其方向性,然后通过试验,研究了不同环境水溶液化学作用后的红层黏性土和冲积黏性土中铁离子的化学行为对土体的力学效应及其特性。试验结果表明:(1)含铁离子物质与水作用后的化学行为确实存在正反两方面的双向性力学效应;(2)含铁离子物质的双向性力学效应受环境水溶液的pH值和化学成分的控制;(3)酸性水溶液使含铁离子物质的胶结作用增强,使红土强度提高,形成正方向的力学效应;而碱性水溶液使含铁离子物质的胶结作用降低,形成负方向的力学效应。

At first,the mechanical effect of chemical action of the material with abundant iron ion in rock and soil and its orientation are analyzed in terms of geochemistry theory in this paper. Then,the positive and negative mechanical effects of chemical action of the material with abundant iron ion in red soils or the common clay reacted chemically by different aqueous solution are studied through a series of experiments. The results show: (1)There are really positive and negative mechanical effects in the chemical-mechanical action between the material with abundant iron ion in soils and a certain aqueous solution. (2)The positive and negative mechanical effects are controlled by pH and chemical composition of aqueous solution. (3)The cemented action of the material with abundant iron ion is strengthened by the acid reaction of aqueous solution in red soils, or is weakened by the alkaline reaction. This has come to positive and negative mechanical effects in the chemical action between the material with abundant iron ion in the soils and a certain aqueous solution.