中国铁道科学2011，Vol.32Issue(5)：8-12,5.
桩网复合地基加筋垫层土工格栅变形机理研究
Research on the Deformation Mechanism of the Geogrid Reinforced Cushion for Pile-Net Composite Foundation
摘要
Abstract
One cross section in the reinforcement segment by CFG piles of Wu-Guang high-speed railway was chosen to fix 14 flexible displacement meters at intervals in the geogrid on the pile top and in the soil between piles to monitor the change of the geogrid as the horizontal reinforcement with load and time. Combined with the monitoring results, the internal mechanism of geogrid deformation was studied. The results indicate that, either on the pile top or in the soil between piles, the geogrid deformation along the cross section of the subgrade can be approximately divided into three areas: the central area of subgrade, the transition area under the shoulder and the slope toe area of subgrade. The soil arching effect is the important factor in geogrid deformation process. Local compression area exists either on the pile top or in the soil between piles under soil arching effect. When the reinforced cushion is composed of graded crushed stones, the most easily failure place of geogrid is located at pile-soil juncture, and the failure mode of geogrid is more similar to acetabuliform rather than parabola.关键词
高速铁路/桩网复合地基/土工格栅/变形机理Key words
High-speed railway/ Pile-net composite foundation/ Geogrid/ Deformation mechanism分类
交通工程引用本文复制引用
杨果林,王亮亮..桩网复合地基加筋垫层土工格栅变形机理研究[J].中国铁道科学,2011,32(5):8-12,5.基金项目
国家自然科学基金资助项目(50778180) （50778180）
铁道部科技研究开发计划项目(2005K002-B-2-1) （2005K002-B-2-1）
