摘要
以珠海横琴口岸某软基处理工程为研究对象,结合监测数据,归纳总结了膜下真空度、孔隙水压力、地表沉降、土体分层沉降与水平位移等指标随加载的变化规律,对真空-堆载联合预压处理滨海深厚软土地基的特性进行了全面分析。将砂井地基等效为砂墙地基,并通过降低砂垫层及砂井的水头来等效施工加载过程中真空度的传递,建立了二维平面应变有限元分析模型。计算结果表明:地基变形计算值与实测结果基本吻合。最后基于有限元分析结果预测了联合预压对周围地基的影响范围。研究结果可为滨海软基处理的设计和施工提供指导。
Based on monitoring statistics of a soft foundation treatment project in Zhuhai hengqin port,thechanging regularity of indexes including vacuum degree under sealing membrane, pore water pressure,ground surface settlement,layered settlement and soil horizontal displacement versus vacuum-surcharge pre-loading was summarized,which gives us a comprehensive understanding on characteristics of coastal deepsoft foundation improved by vacuum-surcharge preloading. A 2D plane strain FEM model was establishedwith the assumption that the sand-drained ground is equivalent to sand-wall ground. In order to simulatevacuum degree transmission in sand cushion and vertical drainage channel,an equivalent drop in groundwa-ter head is defined along the surface of sand cushion and vertical drainage channel. The calculated grounddeformation values coincide basically with measured data,verifying the feasibility of equivalent method. Theground range influenced by vacuum-surcharge preloading was predicted on basis of FEM calculation. The re-search results may provide guidance to design and construction of coastal soft foundation treatment.
出处
《水利学报》
EI
CSCD
北大核心
2015年第S1期296-302,共7页
Journal of Hydraulic Engineering
关键词
深厚软基
真空-堆载预压
处理效果
特性分析
deep soft foundation
vacuum-surcharge preloading
treatment efficiency
characteristic analysis
