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膨胀土掺石灰改性之后,其粉粒组的含量显著增加。当采用湿法击实时,由于土体保持了原有的结构性并表现出粉土的特性,在某个较低含水率时,击实功没有超过破坏其结构性的程度,出现一个干密度峰值。随着含水率的增加,击实功破坏了土的结构性,土体重新压实,曲线出现了另一个大干密度的峰值。因此,击实曲线表现出不稳定的双峰现象,从而降低了击实曲线的实用性及可靠性。然而采用修正湿法得到的击实标准,相对于湿法更加合理,相对于干法更加实用可靠,为工程施工质量控制与路基工后质量评价提供了更加有效的方法。
After the expansive soil is modified with lime, the content of the powder group increases significantly. When wet compaction was used, the compaction effort did not exceed the level of destroying its structure at a lower moisture content due to the soil’s original structural properties and silt properties, resulting in a dry density Peak. As the water cut increases, compaction reduces the structural properties of the soil, and the soil compresses again. The curve shows another peak of large dry density. Therefore, the compaction curve shows an unstable bimodal phenomenon, thereby reducing the practicality and reliability of the compaction curve. However, the compaction standard obtained by the modified wet method is more reasonable than the wet method and more practical and reliable than the dry method, which provides a more effective method for quality control of construction and post-construction quality evaluation.