Abstract

In recent years, a new type of composite column consisting of an impervious and stiffer core surrounded by a granular and pervious shell is emerging to improve soft soil in practice. This paper developed an analytical model for consolidation of soft ground improved by this type of composite column. Analytical solution is firstly derived for the soft soil stabilized by composite columns with circular cross section subjected to a general time-varying surcharge loading. Specially, detailed solutions are further obtained for two types of multistage loading commonly encountered in practice, i.e. a multistage instantaneously loading and a multistage ramp loading. Then, the analytical solutions are extended to the consolidation of composite column with non-circular cross section by converting it into an annulus instead of a circle. Finally, a parametric analysis and a comparison to an existing solution are performed to investigate the consolidation behavior of composite ground improved by composite columns.

摘要

近年来，在实践中出现了一种由不透水且较硬的芯材被颗粒状透水壳包围的新型复合柱，以改善软土。本文建立了一种由这种组合柱改进的软土地基固结分析模型。首次推导出圆形截面复合柱在一般时变超载荷载作用下稳定软土的解析解。具体地，对实践中常见的两种多级加载，即多级瞬时加载和多级斜坡加载，进一步得到了详细的解决方案。然后，将解析解扩展到非圆形截面的复合柱的固结，将其转换为环形而不是圆形。最后，