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通过对几组低温下不同冻结历时黄土三七灰土击实试验结果 ,与现场低温下施工碾压效果的对比分析表明 :冻结会对黄土灰土产生显著冻胀作用 ,直接影响碾压质量 ,当温度从 - 1℃降低到 - 9℃ ,土体压实干密度从 1 .58t/m3降至 1 .41 t/m3;在同一低温下冻结历时从 2 h增长到 6h,而土体压实干密度也相应降低 ;同时 ,最优含水量也相应减小 ,当土体含水量≤ 1 30 g/kg时 ,灰土碾压质量几乎不受冻结的影响 ,即黄土三七灰土冻结起始含水量为 1 30 g/kg。本研究还分析了灰土冻结的机理和发生发展过程 ,对灰土碾压冬季施工的工程质量评价和施工对策提供了理论和量化分析依据
Comparing the compaction results of several groups of loess thirty-seven lime soil with different freeze-thawing times at low temperature, the comparison with the rolling effect at low temperature shows that the freezing has a significant frost heaving effect on the loess soil and directly affects the rolling quality. When the temperature From -1 ℃ to-9 ℃, the compaction dry density of soil decreased from 1.58t / m3 to 1.41t / m3. The freezing time increased from 2h to 6h at the same low temperature, while the compaction dry density And the optimum water content decreases correspondingly. When the soil moisture content is less than 1 30 g / kg, the quality of the roller compaction is almost unaffected by the freezing, that is, the initial water content of freezing in the loess soil is 1 30 g / kg. The study also analyzed the mechanism of ash freeze and its occurrence and development process, provided theoretical and quantitative analysis basis for engineering quality evaluation and construction measures of lime crushed winter construction