湘西南红黏土路堤填筑技术研究  

Study of embankment filled technology of laterite soil in Southwest Hunan

作　　者：万智 郭爱国[3] 谈云志[4] 刘宝琛[1] 吴亚中[5] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]湖南省交通科学研究院,长沙410015 [3]中国科学院武汉岩土力学研究所,武汉430071 [4]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [5]湖南省交通运输厅,长沙410011

出　　处：《岩土力学》2011年第8期2281-2286,共6页Rock and Soil Mechanics

基　　金：湖南省交通科技进步与创新计划(No.200544No.200910);交通部西部交通建设科技项目(No.200631878530);国家自然科学基金项目(No.51009084)

摘　　要：湖南的湘西南地区气候潮湿多雨,由于特殊的气候及地质条件,广泛分布着由碳酸岩风化形成的高液限红黏土。红黏土天然含水率高,又由于其本身固有的大孔隙比和结构性强的特点,要达到规范要求的压实度较为困难。结合该地区公路建设,开展了红黏土填料含水率、松铺厚度、碾压机械等多种工况组合下的现场碾压试验研究,其目的在于探求适合红黏土填料的碾压工艺,提出兼顾土体碾压效果和路堤填筑质量的压实控制建议。研究表明,压路机选用凸块振动碾、填土松铺层厚度控制在25～30 cm、土体含水率控制在大于最优击实含水率2%～5%范围时,现场碾压效果较好,压实土体也将具有较为稳定的工程性质。It exists high liquid limit of laterite soil abundantly in southwest area of Hunan Province, which weathered from carbonate rocks due to the humid and rainy climate and geological conditions. The laterite soil possesses special features, such as high natural moisture, inherent large void ratio, strong structural features; so it is difficult to meet the normative requirements of compaction degree. In order to discuss the appropriate compaction technology and put forward an embankment compaction control recommendation for laterite soil, field tests are carried out which combined with many different conditions such as moisture, loose laying depth, rolling machines and so on. The results show that the compacted effect is better when using bumping vibration rolling, controlling the laterite soil filling with 25-30 cm loosing thickness and water content beyond the optimum moisture content 2%-5%. At the same time, the comoacted soil will have more stable engineering characteristics.

关 键 词：红黏土 路堤 现场试验 凸块振动碾 填筑技术 

分 类 号：TU446[建筑科学—岩土工程]