石灰粉煤灰黄土工程性质试验研究

发布时间：2018-04-24 06:39

本文选题：路基工程 + 石灰粉煤灰黄土　；参考：《中外公路》2017年05期

【摘要】：为了深入研究石灰、粉煤灰黄土在路基工程中的应用,进行了3组配比石灰、粉煤灰黄土击实试验,不同龄期强度试验,干湿循环作用下、冻融循环作用下及不同饱水时间强度试验。分析试验数据得出:石灰、粉煤灰黄土强度随龄期增长而缓慢增长,180d强度可达到3.5~7.5MPa;28d龄期石灰、粉煤灰黄土经过10次冻融循环后强度降低率在32%~47%之间,经过10次干湿循环后强度降低率在17%~35%之间,4~6次冻融循环或干湿循环后强度基本趋于稳定;28d龄期石灰、粉煤灰黄土经过4d饱水后强度降低率在15%~24%之间,2d饱水后强度基本上趋于稳定。结果表明:28d龄期以上的石灰、粉煤灰黄土已经完成50%左右的强度增长,且强度较高,具有较好的水稳定性和冻融稳定性。0.05∶0.15∶1和0.05∶0.2∶1配比的石灰、粉煤灰黄土力学指标比较接近,0.05∶0.1∶1配比的石灰、粉煤灰黄土力学指标较差,在工程应用中应优先考虑0.05∶0.15∶1和0.05∶0.2∶1配比。
[Abstract]:In order to deeply study the application of lime and fly ash loess in subgrade engineering, three groups of mixed lime, fly ash loess compaction test, strength test of different ages, dry and wet cycle were carried out. Experiment of freezing and thawing cycle and different saturation time intensity. The experimental data show that the strength of lime and fly ash loess increases slowly with the increase of age. The strength of fly ash loess can reach 3.57.5MPA / 28d lime, and the strength of fly ash loess decreases by between 32 and 47% after 10 freeze-thaw cycles. After 10 dry and wet cycles, the strength decreases between 17% and 35%, and the strength tends to be stable at 28 d after freeze-thaw cycle or dry and wet cycle. The strength reduction rate of fly ash loess after 4 days saturated with water is between 15% and 24%, and the strength of fly ash loess after 2 days saturation tends to be stable. The results show that the lime and fly ash loess over the age of 28 days have achieved a strength increase of about 50%, and the strength is relatively high. The lime with good water stability and freeze-thaw stability of 0.05: 0.15: 1 and 0.05: 0.2: 1 is the same as the lime with the ratio of 0. 05: 0. 2: 1 and 0. 05: 0. 2: 1, respectively. The soil mechanics index of fly ash is close to that of lime with the ratio of 0.05: 0.1: 1, and that of fly ash is poor. The ratio of 0.05: 0.15: 1 and 0.05: 0.2: 1 should be given priority in engineering application.
【作者单位】：信息产业部电子综合勘察研究院;
【基金】：国家自然科学基金资助项目(编号:41472267)
【分类号】：U414

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