工程地质学报2018，Vol.26Issue(6)：1447-1453,7.DOI:10.13544/j.cnki.jeg.2017-415
高填方下覆结构性黄土次固结特性研究
STUDY ON PROPERTIES OF SECONDARY CONSOLIDATION OF STRUCTURED LOESS UNDER HIGH FILL
摘要
Abstract
Study on secondary consolidation characteristics and mechanism of structured loess has become an effective means of calculating and controlling post-construction settlement in loess high fill foundation. In this paper, the secondary consolidation characteristics and deformation mechanism are studied by means of compression test of structured loess. Then the formula describing the time effect of secondary settlement coefficient is established.The test results show that an obvious secondary-consolidation effect exists in structured loess. The load coefficient of secondary consolidation curve (P-Cα) increases first and then decreases, and it finally tends to be stable. The peak of Cα corresponding to the loading value is greater than Pc. High stress loads are not major controlling factor of the secondary consolidation coefficient. The influence mechanism of load and water content on secondary settlement coefficient is analyzed based on geotechnical mechanics. The P-Cα curve of structured loess in high water content only decreases and tends to be a stable period by weakening effect of water on soil particles. Establishing the formula describing the time effect of secondary settlement coefficient can provide help for post-construction calculation of the covered original loess foundation in high fill engineering.关键词
结构性黄土/次固结系数/机制/时间效应Key words
Structured loess/Secondary consolidation coefficient/Mechanism/Time effect分类
建筑与水利引用本文复制引用
郅彬,王番,王永鑫,武李和乐,焦航..高填方下覆结构性黄土次固结特性研究[J].工程地质学报,2018,26(6):1447-1453,7.基金项目
国家自然科学基金"荷载-湿度-温度耦合效应下黄土崩塌灾害形成的机理研究"(41172262) （41172262）
陕西省重点科技创新团队计划项目(2014KCT-30)资助. （2014KCT-30）
