粉煤灰改良膨胀土路堤试验研究.pdf

粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2018NO.2 试验与应用 粉煤灰改良膨胀士路堤试验研究 Experimental Study on Expansive Soill Embankment Improved by Fly Ash 高熙贺 (杨凌职业技术学院，陕西咸阳712100) 摘要：对粉煤灰改良膨胀土的改良成效及可行性进行了研究和分析，试验结果表明，随着粉煤灰掺量的增加， 膨胀土的塑性以及活性指数、膨胀力、膨胀率乃至膨胀量都逐渐减小，由此表明粉煤灰可以有效对膨胀土浓缩性造成 降低影响.经过一定养护期之后的膨胀试验结果表明，随着养护期限的不断递增，膨胀土的膨胀量及膨胀力会随之降低. 没有经过养护的膨胀土无侧限抗压强度相对较不明显.在经由养护之后，路堤的土样抗压强度增加，且无侧限抗压强 度存在峰值点. 关键词：粉煤灰；膨胀土；路堤试验 中图分类号：U416.1*2 X773 文献标识码：A 文章编号：1005-8249(2018)02-0035-05 Gao Xihe Yangling Vocation and Technical College Yangling Shanxi 712100 China) Abstract:The corresponding improvement effect and feasibility of fly ash improved expansive soil was mainly studied in the embankment experiment.It was found that with the continuous increase of fly ash the plasticity and expansivity expansivity rate and expansion of expansive soil are gradually reduced which shows that fly ash has reduced impact on expand Soil concentration.Expansion experiments after a certain curing period show that as the curing period increases the expansive amount and expansive force of expansive soil decreases.Unconfined pressive strength of uncured expansive soil is relatively insignificant.After curing embankment soil sample c...