二灰黄土是利用石灰、粉煤灰与土料混合作为回填土的一种新型材料，用以代替传统的灰土或素填土。
Lime-fly ash loess, composed of fly ash, lime and loess, is a new material in subgrade backfill to take the place of the (traditional) lime soil.
其次，进行了陶粒粉煤灰混凝土、粘性土、风积砂、砂砾和石灰土等几种材料的台背回填离心模型试验。
Secondly, models with different backfill-material such as argil fly-ash concrete, soil, sand, grit and lime-stabilized soil were experimented.
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