摘要
路基填料的承载比(CBR值)是土体抗局部剪切力的反映,是评价路基土强度和稳定性的主要依据之一.选取罗定高速公路定西段黄土为研究对象,进行不同击实次数、石灰剂量、浸水时间条件下的室内CBR试验.试验结果表明:生石灰的掺入改变了黄土的微观结构特征,使黄土的强度和水稳性显著提高;相同击实次数条件下石灰土的压实度低于黄土的压实度;石灰土击实70次条件下的CBR值最大;试验确定生石灰的最佳掺量为3%,给出掺灰量、压实度及CBR之间的线性回归方程,并在罗定和宝天高速公路6个试验段进行验证与应用.
The California bearing ratio（CBR value） of subgrade filling material reflects the capacity to resist the local shear in the soil,and was one of the major indexes to evaluate the strength and stability of the subgrade soil.Taking the loess located at Dingxi area in Luoding highway as investigation object,CBR tests were conducted in cases of different compaction times,lime dosages and immersion times.The test result indicated that the strength and water stability of the microscopic structure of the loess would be obviously improved due to the inclusion quick lime.Compaction degree of lime soil would be lower than that of loess with the same compaction times;CBR would reach its maximum value when compacted by 70 times;in laboratory the optimal lime dosages in loess was equal to 3%.A linear regression relation among lime dosage,compaction degree and CBR was put forward and was verified and applied in six test sections of Luoding and Baotian highways.
出处
《兰州理工大学学报》
CAS
北大核心
2010年第2期105-109,共5页
Journal of Lanzhou University of Technology
基金
甘肃省自然科学基金(0803RJZAO11
0916RJZAO24)
浙江省自然科学基金(Y1090039)
关键词
CBR
黄土
生石灰
路基
california bearing ratio
loess
quick lime
subgrade
