论文部分内容阅读
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。
The saturated strength test of lime-fly ash loess, the strength test of lime-fly ash loess under different freezing-thawing cycles and the strength increase of lime-fly ash loess under different freeze-thaw cycles were carried out. Strength characteristics of loess. The results show that the intensity of lime-gray loess slowly increases with age, and the saturation strength of long-lime-lime loess decreases only by 2.4%. The average strength of lime-loess with low age decreases by 19.0 after 1 to 6 cycles of freeze-thaw cycles %, The strength of long-age lime-gray loess is basically the same, only decreased by 2.4%; after the low-age lime-gray loess undergoes 6 cycles of freezing and thawing, the saturated water intensity reduces by 47.9% on average, and the average of 4 cycles of freeze-thaw cycles decreases by 41.9% Long-term lime-dust loess experienced six freeze-thaw cycles, the average water-saturated intensity decreased by 14.6%, and the average of four freeze-thaw cycles decreased by 7.5%. Lime-lime loess of 3, 7, 14 and 28 days underwent one freeze-thaw cycle After 90 days of recycle, the long-term strength decreased only by 4.0%. The long-dated lime-gray loess had an initial strength of 60%, with good water stability and good freeze-thaw stability. Region as the subgrade of subgrade.