红黏土直接填筑路堤的控制指标探讨  

Discussion on Different Indices of Embankment Filled with Laterite Directly

作　　者：陈文轩[1,2] 王保田[1,2] 董薇[1,2] 范磊[1,2] 

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,南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,南京210098

出　　处：《三峡大学学报（自然科学版）》2017年第2期65-68,共4页Journal of China Three Gorges University：Natural Sciences

基　　金：中央高校基本科研业务费项目"卸荷条件下非贯通节理特征敏感性分析"(2016B43014)

摘　　要：红黏土是一种特殊的路堤填料.红黏土的物理性质较差,但力学性质比较好.路基施工规范表明,红黏土用于直接填筑路堤时,可根据具体情况适当降低压实度,但没有给出明确的控制指标和标准.利用江西红黏土进行直接填筑的控制指标和压实度控制标准研究,试验结果表明:红黏土用于直接填筑路堤时,采用加州承载比(CBR)强度、抗剪强度、收缩系数、体缩率和干湿循环作用下的压缩系数作为控制指标较为合适.本试验所用江西地区红黏土,用作填料在最优含水率附近直接填筑时,压实度可比规范要求的降低3%.Laterite is a special embankment filling. The physical properties of laterite is poor; but the mechanical properties are better. There are clearly states in the technical specification of highway subgrades that it can decrease the compactness according to particular case by using laterite filling embankment directly; but it did not state clear compaction control standards. By using the laterite of Jiangxi Province, direct filling and compaction control standards are discussed. The test results show that the california bearing ratio（CBR） strength, shear strength, shrinkage, volume shrinkage coefficient and compressibility under the action of wetting and drying cycle can be used as the control indices for laterite. The laterite from Jiangxi province that used in this test, is used as a filler in the direct vicinity of the optimum moisture content filling, the compactness compared to regulatory requirements reduces by 3 %.

关 键 词：红黏土 直接填筑 控制指标 干湿循环 压实度 

分 类 号：TU441.2[建筑科学—岩土工程]