掺砂高液限土加州承载比影响因素试验  

Influence factors of California bearing ratio test for high liquid limit soil mixed with sand

作　　者：卢自立[1] 曹亮宏[1] 程涛[2,3] 

机构地区：[1]广东省长大公路工程有限公司,广东广州510620 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [3]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《水利水电科技进展》2013年第5期65-68,共4页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51079052);广东省交通厅基金(200903005)

摘　　要：为确定云罗高速公路沿线的高液限土改良方案,通过不同掺砂比例的颗粒分析试验、相对密度试验、液塑限试验、击实试验和室内加州承载比(CBR)试验,对掺砂前后高液限土的颗粒级配分布,掺砂高液限粉土和高液限黏土的承载比影响因素,如掺砂量、浸水时间对CBR值的影响规律等进行了试验研究。结果表明:粗颗粒质量分数越高,摩擦力越大,黏聚力越小,水敏感性越差;影响土体CBR值的主要因素是粗颗粒质量分数,其次为浸水时间。In order to determine the improvement scheme of high liquid limit soil along the Yunluo expressway,the particle size distributions of the high liquid limit soil with or without sand were analyzed based on the grain size analysis tests,relative density tests,liquid and plastic limits tests,compaction and indoor California bearing ratio（CBR） tests for different sand proportions.The impact factors with obvious regional features for the bearing ratios of high liquid limit silt mixed with sand and high liquid limit clay were investigated.The influences of sand content and immersion time on the CBR values were summarized and some useful conclusions were drawn in the study.With a greater mass fraction of coarse particles,the friction force and the cohesion force were found to be increased and decreased respectively,and the water sensitivity became poor.The mass fraction of coarse particles is the main impact factor on CBR values,and the immersion time is the secondary.

关 键 词：高液限土 掺砂改良 加州承载比 掺砂量 浸水时间 

分 类 号：U412.22[交通运输工程—道路与铁道工程]