碱侵蚀红土的工程指标与受损物质的关系探析

GROPING OF RELATIONSHIP BETWEEN ENGINEERING INDICES AND DAMAGED SUBSTANCES OF LATERITE ERODED BY ALKALI

常用加固材料中的碱性物质与红土中的酸性或两性氧化物发生互损侵蚀。基于材料的化学分析和加速寿命试验原理,设计红土的碱侵蚀试验。检测红土被侵蚀前后渗透液中有效离子含量的变化,以代表红土中相关物质的受损情况;对比试验红土被侵蚀前后主要的工程指标,以代表红土的工程品质劣化情况;分析并建立两者之间的关系。采用多元逐步回归分析法,量化研究碱侵蚀红土中,各项工程指标与受损化学物质之间的相关性;并依据建立的关系式,进一步探讨有效离子对红土工程性质的影响。结果表明:在碱侵蚀红土中,主要工程指标的变化均与化学物质的受损存在着显著的量化关系。分晰碱性物质对红土的侵蚀劣化机制,并可据此分析红土工程的劣化速度与趋势。

Mutually demolishing and eroding occur between the alkaline reinforcement material and the acidic laterite. The alkali erosion tests were designed for laterite based on the chemical analysis of the materials and the principle of life acceleration. The content changes of the effective ions representing the losses of crucial substances in laterite were detected from the leachate from the eroded laterite of the control experiments. Main engineering indices were tested on virgin and eroded laterite to obtain the degradation of the engineering qualities of laterite. The relationships between the ion contents and the engineering indices were established and analysed. The relationships between the engineering indices and the losses of chemical substances were studied using the stepped regression analysis of multiple variables. The effect of effective ions on engineering quality was thoroughly discussed with the relationships derived. Significant quantitative correlations exist between the changes of main engineering indices and the losses of chemical substances in laterite eroded by alkali. Degradation mechanism of the laterite eroded by alkali was revealed,which may be useful for analyzing the speed and trend of deterioration in laterite engineering.