真空-堆载联合预压加固道路软基过程研究  

STUDY ON INFLUENCING PROCESS OF VACUUM-SURCHARGE PRELOADING REINFORCED SOFT ROADBED

作　　者：姜立宝 Jiang Li-bao

机构地区：[1]中国铁建港航局集团有限公司总承包分公司,广东珠海519000

出　　处：《建筑技术开发》2023年第11期158-161,共4页Building Technology Development

摘　　要：采用ABAQUS有限元软件模拟珠三角洪湾港北片区典型软土地基真空-堆载联合预压加固过程,验证此类工程数值模拟可行性。基于已建数值模型,分析不同堆载时间间隔和堆载速率时软基加固区边界点位移变化。结果表明:有限元计算所得地基沉降规律、沉降量与实测结果吻合度较高;堆载时间间隔对加固区变形影响不大;施工过程保证规范要求最小时间间隔(10d),连续堆载使加固区更快固结,减少抽真空时间;较高堆载速率能加速固结,节约抽真空时间,但可能引起堆载过程中地基失稳现象。选取堆载速率20d/级,既可保证较短抽真空时间,又可避免堆载过程产生失稳现象。The feasibility of engineering numerical simulation is verified by ABAQUS software on selected soft roadbed(north area at Hongwan port in Zhuhai,China)reinforced with combined vacuum-surcharge preloading method.The displacement of reinforced soft ground at varying surcharge time intervals and rates is analyzed on the established numerical model.The obtained results show that the ground settlement obtained by the finite element calculation agree well with the measured in-situ data.The surcharge time interval has slight impact on the deformation of reinforced area,and the minimum time interval(10 d)is required by the construction specification.Especially,the continuous loading mode can accelerate the consolidation and reduce the vacuum time.Higher surcharge rate speeds up the consolidation and saves the vacuum time,but may cause ground instability during loading.The surcharge loading rate is 20 d/step to ensure a short vacuum time and avoid surcharge instability.

关 键 词：道路软基 真空–堆载预压 有限元 堆载时间 堆载速率 

分 类 号：U416[交通运输工程—道路与铁道工程]