摘要
通过不同超载比、不同作用时间的一维固结试验,研究软土在超载作用过程的变形机理。研究表明,超载作用时间过长会使地基的总变形量增加,相对于等载预压过程,超载的作用时间越长、超载比越大,超载卸除后的次压缩变形越小。以提早完成基准期次压缩变形量为目标,过大的超载比是没必要的。工程算例表明,在较长的超载时间情况下,较小的超载比也可以满足工程需要。
A series of 1-D consolidation tests were carded out for soft clay with different over pressure ratios （OPR） and different preloading durations. It was found that longer surcharge preloading duration could make the total magnitude of deformation of soft clay larger, and the more surcharge preloading duration and the larger OPR, the less magnitude of secondary compression deformation of soft clay after unloading was, compared with that under permanent pressure loading. For the purpose of finishing secondary compression deformation of soft clay early, too large OPR was not necessary. The calculated results from one construction site indicated that shorter OPR also could satisfy the demand of control settlement when surcharge preloading duration was longer.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第7期896-901,共6页
Chinese Journal of Geotechnical Engineering
基金
广东省交通科技项目
关键词
软基
路堤
超载预压
主固结
次压缩
超载数量
超载时间
soft foundation
embankment
surcharge preloading
primary consolidation
second compression
magnitude of surcharge
surcharge preloading duration
