摘要
对取自柬埔寨金港高速公路沿线的土样进行工程特性试验和路用性能试验,分析典型红土的基本物理力学性质,包括土样的含水率、级配、密度、液塑限和承载比(CBR)。结果表明:红土的天然含水率与其最佳含水率间存在显著差异,且其含有较多细颗粒导致级配较差,现场施工时需改良其级配并调整含水率后方可用于路基填筑,并应做好防排水措施以保证路基湿度处于最佳状态;红土的差异性较大,不同土样的击实特征不同,建议按土样类型分段填筑,对各段实行不同的验收标准;红土的CBR值随压实度增大而显著增大,随塑性指数和小颗粒通过率(尤其0.075 mm筛通过率)的乘积的增大而大幅减小,在实际路基工程中应谨慎使用塑性指数较大且细粒含量较高的红土。
A series of engineering characteristic tests and road performance tests were conducted on soil samples taken along the Jingang Expressway in Cambodia to analyze the basic physical and mechanical properties of typical laterite,including the water content,gradation,density,liquid plastic limit,and bearing ratio(CBR)of the soil samples.The results indicate a significant difference between the natural moisture content of laterite and its optimal moisture content,as well as poor grading due to the presence of fine particles.To use this soil for subgrade filling,it is essential to improve grading and adjust the moisture content on-site,while also implementing waterproof and drainage measures to ensure optimal subgrade humidity.Therefore,it is recommended to fill in sections according to soil sample types due to significant differences in laterite and different compaction characteristics of different soil samples,and the different acceptance creteria are applied to each paragraph.The CBR value of laterite significantly increases with the increase in compactness and decreases significantly with the increase in plasticity index and small particle passing rate,especially the 0.075 mm sieve passing rate.In actual subgrade engineering,it is crucial to exercise caution when using laterite with large plasticity index and high fine particle content.
作者
曾峰
唐康为
陈梓宁
张锋
ZENG Feng;TANG Kangwei;CHEN Zining;ZHANG Feng(China Road and Bridge Engineering Co.,Ltd.,Beijing 100011,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)
出处
《路基工程》
2024年第5期71-76,共6页
Subgrade Engineering
关键词
公路工程
天然红土
基本性质
路用性能
CBR
highway engineering
natural laterite
basic property
road performance
CBR
