论文部分内容阅读
基于试验资料和数值模拟,对超长桩的桩身压缩问题进行了研究。结果表明:(1)持力层对超长桩的桩身压缩有重要影响。入基岩的超长桩2(直径1m,长81.5m)的竖向变形一直以压缩变形为主(占84.5%~100%);未入基岩(以含砾中粗砂为持力层)的超长桩1(直径1m,长78.5m)的竖向变形以加载初期的压缩变形为主逐渐转变为加载后期的刚体变形为主(占75.3%)。(2)持力层上覆土性对桩身压缩也有影响。当其它条件相同而只有持力层上覆土层土性不同时,持力层上覆土层硬时桩身压缩量要大。(3)长径比对桩身压缩也有重要影响。一般情况是,相同的桩顶荷载时长径比越大,桩身压缩量也越大。
Based on the experimental data and numerical simulation, the pile compression of the super-long pile is studied. The results show that: (1) The bearing layer has an important influence on the pile compression of the super-long pile. The vertical deformation of ultra-long pile 2 (diameter 1m, length 81.5m) into bedrock has been dominated by compressive deformation (accounting for 84.5% -100%). The vertical deformation of bedrock ) Of the long pile 1 (diameter 1m, length 78.5m) of the vertical deformation of the initial deformation of the load gradually transformed into the post-load rigid deformation (75.3%). (2) Overburden stratum also affects pile compression. When the other conditions are the same but only the overburden of the overburden is of different soil properties, the overburden of the overburden will be hard to compress when the soil layer is hard. (3) The aspect ratio also has an important effect on pile compression. In general, the greater the aspect ratio of the same pile top load, the greater the pile body compression.