摘要
研究了路基土场土的物理性能、矿物组成及胀缩特性,采用多种方法综合评价土场土膨胀潜势;通过多种配比的石灰改性方案分析,土样胀缩性能均有明显改变。以所选土场土填筑试验工程,观测自然受水条件下高压实度膨胀土路基受水特性,发现路基成型初期受水后,含水量急剧增加,压实度明显降低,强膨胀潜势层位出现在高压实区;90d后路基弯沉观测趋稳定,路基强度形成。结果表明弱—中性膨胀土石灰改性后填筑的路基,其受水影响主要表现在路基成型初期,自然失水干燥后路基强度逐步恢复。
The physical properties, mineral composition and expansive-shrinkage characteristics of the borrow soil were studied, and the evaluation of expansive potential was carried out. The influence of lime-swelling soil by rainfall was analyzed. The results show that the expansion and shrinkage change obviously, the compaction degree lowers clearly and the strong expansive appears where the soil compaction is high. 90 days later, the subgrade deflection becomes stable, and reaches the required strength. As for the subgrade filled with improved light or mid lime-swelling soil, the influence of rainfall appears during the early days of the filled subgrade, and its strength will recovers continuously while the water content lowers naturally.
出处
《交通运输工程学报》
EI
CSCD
2004年第1期15-20,共6页
Journal of Traffic and Transportation Engineering
关键词
道路工程
膨胀土路基
膨胀潜势
受水特性
Evaluation
Infiltration
Rain
Road construction
Shrinkage
Swelling
