湖南大学学报（自然科学版）2017，Vol.44Issue(1)：136-142,7.DOI:10.16339/j.cnki.hdxbzkb.2017.01.017
筋箍碎石桩复合地基桩土应力比的计算与分析∗
Study on Pile-soil Stress Ratio of Composite Foundation Reinforced with Geosynthetic Encased Stone Columns
摘要
Abstract
Based on the deformation characteristics of the composite foundation reinforced with encased stone columns under vertical loads,a new calculation formula to estimate the pile-soil stress ratio of geo-synthetic-encased stone columns was proposed with consideration of pile-geosynthetic-soil interactions.In the derivation process,initial stresses in soil and a column were taken into account,the column was con-sidered as an elastic-plastic material with constant dilatancy angle and satisfying both the Mohr-Coulomb yield criterion and non-associated flow rule,and the soil and geosynthetic encasement were considered as linear-elastic materials.The proposed formula was validated by comparison with the results of elasto-plas-tic limit analysis method.Finally,a parametric study was conducted to investigate various parameter effects of encasement stiffness,deformation modulus of soil,and replacement ratio on the behavior of the pile-soil stress ratio.The parametric study shows that the pile-soil stress ratio of the composite foundation with the encased stone column increases with the increase of encasement stiffness,replacement ratio of composite foundation and friction angle of the column,but decreases with the increase of deformation mod-ulus of soil and dilation angle of column.Moreover,among all these parameters,the encasement stiffness hasd a significant influence on the pile-soil stress ratio.关键词
筋箍碎石桩/弹塑性/桩土应力比Key words
geosynthetic encased columns/elastic-plastic/pile-soil stress ratio分类
交通工程引用本文复制引用
张玲,陈哲,赵明华..筋箍碎石桩复合地基桩土应力比的计算与分析∗[J].湖南大学学报（自然科学版）,2017,44(1):136-142,7.基金项目
国家自然科学基金资助项目(51208191,51678231),National Natural Science Foundation of China(51208191,51678231) （51208191,51678231）
