降低压实度标准的高液限土填筑方案  

Filling scheme of high liquid limit soil by reducing standard of compaction degree

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]河海大学岩土工程科学研究所,江苏南京210098 [3]安徽省质量技术监督局,安徽合肥211167

出　　处：《水利水电科技进展》2014年第4期70-74,共5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：针对高液限土填筑时质量难以达到规范要求的问题,以实际工程高液限土直接填筑方案为例,通过碾压试验、晾晒试验、承载比试验、压缩试验和快剪试验研究了压实度对高液限土各项物理力学性能的影响,分析了不同压实度下高液限土的沉降变形情况。结果表明:在相同条件下,含水率对压实度影响最大,碾压次数次之,高液限土类别最小;压实度的降低对土体的承载比、压缩性能、黏聚力和摩擦角均产生不利影响;通过自密沉降量严格控制不同填土高度时的填筑厚度,高液限土采取包盖法处理及降低压实度标准至88%后的直接填筑方案是可行的。It is difficult to meet the specification requirements of the high liquid limit soil filling quality. Based on the background of direct filling project scheme of high limit liquid soil, a series of indoor and field tests （ i. e. , compaction test, fast drying test, CBR test, compression test, and shear test） was carried out and the influence of compaction degree on various physical and mechanical properties of high liquid limit soil was studied. Additionally, the settlement deformation of high liquid limit soil under different compaction degree was analyzed. The main influence factors of compaction degree are water content, compaction times and the type of high liquid limit soil, the reduce of compaction degree caused the adverse effect on the value of CBR, compression performance, cohesive force and friction angle. After strictly control the thickness under the different filling height, adopt the method of tundish ladle and reduce the standard of compaction degree to 88%, directly filling scheme of high liquid limit soil is feasible.

关 键 词：高液限土 压实度 自密沉降量 承载比 碾压遍数 

分 类 号：U416.1[交通运输工程—道路与铁道工程]