柔性基础下复合地基模型试验研究

应用室内模型试验,对柔性基础下复合地基的桩间土应力、桩体轴向应力、桩顶应力进行了测试,研究不同工况下的变化规律,结果表明桩体轴向力在基础以下两倍桩径深度以内基本相等,从两倍桩径深度以下到有效桩长处,桩体应力随深度的增加而减小;桩土应力比随着桩底持力层强度的提高而增大,随着上部荷载的增加而逐渐趋于稳定。

A PHYSICAL MODELING STUDY ON COMPOSITE SUBGRADES UNDER FLEXIBLE FOUNDATIONS

Using indoor physical modeling of composite subgrades un der flexible foundation, the earth pressure between piles, the axial stress of p iles and the stress at pile top are measured, for various scenarios. The results indicate: (1) the axial force of pile within a depth of two times of the pile d iameter below the foundation essentially remains constant, while for the rest of the effective pile length, the stress decreases with depth; (2) the pile-soil r atio increases with the strength of the bearing stratum, and gradually becomes s table as the top load increases.