管式格栅加筋碎石桩的承载力影响因素分析

Analysis of Influencing Factors the Ultimate Axial Capacity of the Granular Columns Reinforced with Geogrid Tubes

分析了竖向管式格栅加筋碎石桩可能的破坏模式,针对不同的破坏模式,提出了单桩极限承载力的理论计算方法。针对各破坏模式,分析了格栅单宽极限抗拉强度、加筋深度、桩径和摩擦角对单桩极限承载力的影响。研究结果表明:加筋对承载力提高作用显著,且桩径越小,提高作用越明显;加筋深度越大,单桩极限承载力越大;单桩极限承载力随桩径的增大呈非线性递增关系,桩径越大,提高越显著;摩擦角越大,承载力提高越显著。

The failure modes of the granular columns reinforced with Geogrid tubes are analyzed.The ultimate axial capacity of the single column is proposed based on each failure mode.The influence of various factors,such as,the limit tensile strength of geogrids,the reinforcement depth,the column diameter and the internal friction angle of granular material,on the ultimate axial capacity of a single column is also studied.The results indicate that the geogrids can greatly improve ultimate axial capacity of the granular columns.The ratio of the ultimate axial capacity of a column with geogrid tube over a column without the tube is decrease with the increase of the column diameter.The capacity ratio is also increase with the reinforcement depth.The magnitude of the ultimate axial capacity is also increase with the column diameter and the internal friction angle of the granular material.