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摘要: 进行了二灰黄土饱水强度试验、不同龄期二灰黄土在6次冻融循环作用下的强度试验和不同龄期二灰黄土在1次冻融循环后的强度增长试验, 分析了二灰黄土的强度特性。分析结果表明: 二灰黄土强度随龄期增长而缓慢增大, 长龄期二灰黄土饱水强度仅降低2.4%;低龄期二灰黄土经过1~6次冻融循环后, 强度平均降低19.0%, 长龄期二灰黄土强度基本不变, 只降低了2.4%;低龄期二灰黄土经历6次冻融循环后, 饱水强度平均降低47.9%, 4次冻融循环平均降低41.9%, 长龄期二灰黄土经历6次冻融循环后, 饱水强度平均降低14.6%, 4次冻融循环平均降低7.5%;3、7、14、28d龄期的二灰黄土经历1次冻融循环再养护至90d, 长龄期强度只下降了4.0%;长龄期二灰黄土已经初步完成60%的强度增长, 具良好的水稳定性和较好的冻融稳定性, 可以在冻土地区作为路基的底基层。Abstract: For lime-fly ash loess, the water-saturated strength test, the strength test at different ages under 6 freezing-thawing cycles and the strength increasing test after 1 freezing-thawing cycle were carried out, and the strength properties were analyzed.Analysis result shows that the strength of lime-fly ash loess grows slowly with age, and the water-saturated strength of long age lime-fly ash loess only reduces by 2.4%.The strength of early age lime-fly ash loess after 1 to 6 freezing-thawing cycles decreases by 19.0% evenly.The strength of long age lime-fly ash loess after 6 freezing-thawing cycles is essentially same, and only decreases by 2.4%.The water-saturated strength of early age lime-fly ash loess decreases by 47.9% evenly after 6 freezing-thawing cycles, and the strength average decreases by 41.9% after 4 freezing-thawing cycles.The water-saturated strength of long age lime-fly ash loess decreases by 14.6% evenly after 6 freezing-thawing cycles, and the strength average decreases by 7.5% after 4 freezing-thawing cycles.When the lime-fly ash loesses with 3, 7, 14, 28 d ages under 1 freezing-thawing cycle are conserved to 90 d, the long age strength average decreases by 4.0%.Therefore, the long age lime-fly ash loess has completed 60% of strength increase, and has better water stability and freezing-thawing stability.
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图 3 二灰黄土饱水强度降低率
Figure 3. Strength decrease rates of water-saturated lime-fly ash loess
图 4 经历不同冻融循环后3d龄期二灰黄土的强度
Figure 4. Strengths of 3dlime-fly ash loesses after different freezing-thawing cycles
图 5 经历不同冻融循环后7d龄期二灰黄土的强度
Figure 5. Strengths of 7dlime-fly ash loesses after different freezing-thawing cycles
图 6 经历不同冻融循环后14 d龄期二灰黄土的强度
Figure 6. Strengths of 14 d lime-fly ash loesses after different freezing-thawing cycles
图 7 经历不同冻融循环后28 d龄期二灰黄土的强度
Figure 7. Strengths of 28 d lime-fly ash loesses after different freezing-thawing cycles
图 8 经历不同冻融循环后90 d龄期二灰黄土的强度
Figure 8. Strengths of 90 d lime-fly ash loesses after different freezing-thawing cycles
图 9 经历不同冻融循环后二灰黄土强度降低率
Figure 9. Strength decrease rates of lime-fly ash loesses after different freezing-thawing cycles
图 10 经历6次冻融循环后二灰黄土强度平均降低率
Figure 10. Average strength decrease rates of lime-fly ash loesses after 6 freezing-thawing cycles
图 11 经历不同冻融循环后二灰黄土饱水强度降低率
Figure 11. Strength decrease rates of water-saturated lime-fly ash loesses after different freezing-thawing cycles
图 12 经历不同冻融循环后二灰黄土饱水强度降低率
Figure 12. Average strength decrease rates of water-saturated lime-fly ash loesses after different freezing-thawing cycles
图 13 经历1次冻融循环后二灰黄土90 d强度
Figure 13. 90 d strength of lime-fly ash loess after 1 freezing-thawing cycle
图 14 经历1次冻融循环后二灰黄土强度降低率
Figure 14. Strength decrease rate of lime-fly ash loess after 1 freezing-thawing cycle
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