摘要
以南京滨江大道工程为研究对象,针对临水地区道路建设中路堤结合路基的长期变形及控制措施进行研究。通过数值模拟,对比分析软土层选取摩尔库伦模型和软土蠕变模型时路基的沉降变形规律;再对比分析填筑速率对路基沉降变形的影响。结果表明:当软土层采用摩尔库伦模型时,路基沉降变形对荷载的敏感度较高,在堆载后的短时间内就能完成固结和沉降;摩尔库伦模型软土层沉降变形的整体性差,整体侧向水平位移小,最大水平位移发生的位置在软土层中部而非软土蠕变模型的中上部,采用软土蠕变模型进行固结分析更接近实际;填筑速率越大,对路基的沉降变形影响越大,设计施工中在进度允许的情况下,应尽量降低填筑速率。
Taking the project of Binjiang road in Nanjing as the research object, the long-term deformation and control measure of subgrade combining with embankment of the road construction in the areas near water are researched. Through numerical simulation, the settlement and deformation regularities of subgrade calculated with both Mohr-Coulomb model and soft analyzed. Then, the influences of different filling soil creep model for soft soil layer are compared and rates on the subgrade settlement and deformation are compared and analyzed. The results show that （ 1 ） when adopting Mohr-Coulomb model to the Soft soil layer, the subgrade settlement and deformation is more sensitive to load, the soft soil layer can complete the consolidation settlement in a short time after stack; （2） the wholeness of settlement and deformation of soft soil layer calculated with Mohr-Coulomb Model is poor; the overall lateral displacement is small, the maximum horizontal displacement occurs in the central part of soft soil but not in the upper part of the soft soil creep mode, horizontal displacement is small, the maximum horizontal displacement occurs in the central part of soft soil, using the soft soil creep model for consolidation analysis is closer to the actual; （3） the higher the filling rate, the greater the influence on the subgrade settlement and deformation, the filling rate should be reduced during construction if possible.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第11期33-40,共8页
Journal of Highway and Transportation Research and Development
基金
国家十二五科技支撑计划项目(2012BAB29B02)
