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中文摘要：
基于离子效应,以改良路基土体为目的,对土样、水样和粉煤灰的复合体进行室内水化学试验、土体物理力学常规试验和直剪试验,并从水化学的力学效应、水化学、指标线性回归和路基土的改良效果4个方面对土体抗剪强度的水土作用机制进行统计分析。研究结果表明：含水土体的Ca2＋,HCO3-,K＋和Na＋等浓度对土体的原始黏结力和固有黏结力有明显的减弱效应,而NO3-和Cl-质量浓度对其影响较弱;内摩擦角随离子质量浓度的变化离散性很大;K＋,Na＋,Ca2＋和HCO3-浓度以及总矿化度、硬度与黏结力有很好的线性相关性,然而,它们与内摩擦角的相关性较差;当粉煤灰掺入量为10%左右时,对路基土的改良有显著效应。
英文摘要：
Based on the ion effect and the porpose of improved roadbed soil, samplings of soil, ground water and clays were obtained to observe and analyze the effect. The analysis on mechanics of water-soil interaction was carried out to find factors of shear strength, including mechanics effect of water chemical, analysis test on water chemical, linear correlation regress and effect of loadbed soil improvment. The results show the weakened effect occurs on soil cohesion and inner friction angle with Ca2＋, HCO3-, K＋ and Na＋ consistency. But dispersed inner friction angle character is marked with ion consistency. There are correlation among cohesion and testing index including total salinity, hardness, and K＋, Na＋, Ca2＋ and HCO3- concentration. The effect on roadbed improvement is remarkable with clays when the consistency is close to 10%.
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