摘要
新近吹填淤泥地基经无砂垫层真空预压技术加固后,土体强度增长有限、地基有效加固深度小。为此,对不同区域的新近吹填淤泥工程特性进行研究,发现:新近吹填淤泥中高含量黏粒和高含量强亲水矿物是真空固结排水系统排水机效低的主要原因之一。然后,依托珠海港高栏港区某软基处理工程,基于真空固结排水系统的设计原则,开展真空固结排水系统优化现场试验研究,研究结果表明:(1)基于排水系统内真空度传递特性方面考虑,方案3(PVC花管–穿插固定式连接–普通排水板)和方案4(水平整体式排水板–配套接头连接–竖向整体式排水板)最佳。(2)基于土体中的真空度传递特性方面考虑,方案4更适宜于新近吹填淤泥地基。最后,给出一些相关改进措施。
For fresh hydraulic reclamation silt foundation,after improvement of no-horizontal-sand-drainage vacuum preloading technology,soil strength increases only a little,and the effective improved depth is very small. In view of this,soil engineering properties was analyzed and summarized of fresh hydraulic reclamation silt from different area,it is showed that high content of clay particles and strong hydrophilic minerals are one of major reasons why the drainage efficiency of vacuum consolidation drainage system is very low. Then,based on a project on shallow ultra-soft soil improvement in Gaolan seaport area in Zhuhai seaport,following the design principle of vacuum drainage system,a field experiment research was carried out of optimizing the vacuum drainage system. It was concluded that：（1） Based on transfer properties of vacuum degree inside the drainage system,it was better of scheme 3（PVC filter tube-interspersed and fixed-common PVD） and scheme 4（horizontal integral PVD-matching connector-vertical integral PVD）.（2） Based on transfer properties of vacuum degree among soil particles,scheme 4 was most advisable. Finally,some further suggestions were provided in future research.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第A02期4218-4226,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
科技部科研院所技术开发研究专项资金项目(2008EG124222
2009EG124217
2010EG124227)
关键词
土力学
新近吹填淤泥
真空固结排水系统
排水系统设计原则
排水系统优化
soil mechanics
fresh hydraulic reclamation silt
drainage system of vacuum preloading technology
design principle of vacuum drainage system
optimizing the vacuum drainage system
