干湿循环下高液限土力学特性研究  

Mechanical Properties of High Liquid Limit Soil Under Different Drying and Wetting Cycles

作　　者：程涛[1,2] 洪宝宁[1,2] 程江涛[3] 

机构地区：[1]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 [2]河海大学岩土工程研究所,江苏南京210098 [3]安徽省质量技术监督局,安徽合肥230051

出　　处：《四川大学学报（工程科学版）》2013年第6期82-86,95,共6页Journal of Sichuan University (Engineering Science Edition)

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

摘　　要：路基填料的承载比大小反映土体局部抵抗剪切破坏的能力,是评价路基填筑质量的重要检测标准之一。以实际工程高液限土改良方案确定为背景,通过一系列的室内试验研究了具体明显地区特征的掺砂高液限粉土和高液限黏土的承载比影响因素,获得了高液限土在不同掺砂量下、不同干湿循环次数后的吸水量、膨胀率、脱水量对土体的CBR值的影响规律,得出结论:水是引起土体膨胀、收缩及CBR值差异的主要原因;在干湿循环初期以"砂化作用"为主,后期以"裂缝作用"为主;高液限土应填筑在较深的93区;掺砂改良后,其可以填筑在相对较浅的94区。CBR value which reflects the capacity of partial soil resisting shear fai]ure is an important testing standard of embankment filling quality. Based on the background of improving project scheme of high limit liquid soil, a series of indoor tests was carried out to study bearing ratio influencing factors of the obvious regional characteristics of high liquid limit soil mixed with soil, and the influence rule of water content, swelling rate, dehydration rate of the high liquid limit soil in different sand content and different wet and dry cy- cles on CBR value was obtained. The results showed that water is the main reason of expansion shrinkage and differences of CBR value. The action of sand and fracture dominates at the earlier stage and the later stage of dry-wet circulation, respectively. The high hquid limit soil should be filling in the deep 93 area, but after improved by sand, it can fill in the relatively lower 94 area.

关 键 词：高液限土 砂 承载比 干湿循环试验 强度分析 

分 类 号：TU431[建筑科学—岩土工程]