【摘要】 为进一步揭示滩涂淤泥固化土的强度特性及其影响因素,对以沿海滩涂淤泥为原料土、水泥-粉煤灰作为主固化剂配置固化而成的滩涂淤泥固化土的强度特性与固化机理进行了试验研究。通过无侧限抗压强度试验详细探讨了水泥、粉煤灰、减水剂、石灰、石膏、三乙醇胺、硫酸钠、氯化钠等主固化剂和外掺剂对滩涂淤泥固化土强度特性的影响,分析了固化剂和外掺剂对提高固化土强度的机理。结果表明:龄期以及水泥、减水剂、石灰、石膏、粉煤灰、三乙醇胺、硫酸钠和氯化钠等的掺量均对固化土的强度有影响。水泥和粉煤灰掺量越多,固化土的强度越高,而外掺剂,如减水剂、石灰、石膏、三乙醇胺、硫酸钠和氯化钠的掺量存在临界值。在临界值内,固化土的强度随外掺剂的掺量的增加而增加,超过该值后,则随外掺剂掺量的增加而减小。龄期对固化土的强度有较大影响,7 d龄期下的固化土的强度要远小于28 d时的强度。更多还原

【Abstract】 In order to further reveal the strength property and its influence factors of the beach silt stabilized soil, the strength properties and the stabilization mechanism of the beach silt stabilized soil is studies experimentally, of which the stabilized soil is solidified using the coastal beach silt as raw soil and cement- fly ash as main curing agent. By means of unconfined compressive strength test, the influence of main curing agent and additives, such as cement, fly ash, water- reducing agent, lime,gypsum, triethanolamine, sodium sulfate and sodium chloride, etc., on the strength of beach silt stabilized soil, is discussed in great detail. The mechanism of main curing agent and additives on the improvement of stabilized soil strength is analyzed. The results show that: the curing period and the content of cement, water- reducing agent, lime, gypsum, fly ash, triethanolamine, sodium sulfate and sodium chloride, etc., all have influence on the strength of solidified soil. The more content of cement and fly ash is, the higher the strength of the stabilized soil is. But the content of additives, such as water-reducing agent, lime, gypsum, triethanolamine, sodium sulfate and sodium chloride, has a critical value.The strength of the stabilized soil increases with the increase of additive content within the critical value.If the content of the additives passes the critical value, the strength of the stabilized soil will decrease with the increase of additive content. The curing age has much effect on the strength of stabilizes soil.The strength of stabilized oil for 7 ays is far ess han hat for 28 days.更多还原