摘要
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。
Silt content increases significantly during the experiments of lime treated expansive soil. When the wet method is adopted,the soil maintains original structure and performances of silt features. If the water content at a lower level, the compaction power is lower than the structural damage and the compaction curve shows a dry density peak. With the increasing of water content, compaction power exceeds the structural damage and the compaction curve shows another dry density peak. Therefore, the compaction curves show instable bimodal phenomenon, which reduces the practicality and reliability of the compaction curves. However, the modified wet method is adopted to overcome the shortcomings of both wet method and dry method. The results provide an effective method for quality control of construction and quality evaluation of completion.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第4期979-983,共5页
Rock and Soil Mechanics
关键词
膨胀土
消石灰
击实曲线
石灰改性
expansive soil
hydrated lime
compaction curve
lime treated
