超高层建筑钻孔灌注桩基础压缩变形及沉降分析

Compression Deformation and Settlement Analysis of Bored Pile Foundation of Super High-rise Building

为提升超高层建筑桩基础的安全性,文中以某高层建筑为例,利用试验测试方法对超高层建筑钻孔灌注桩基础压缩变形及沉降进行分析。结果表明,钻孔灌注桩桩身完整性良好,抗压强度为56.8 kPa,桩身波速为4200~4550 m/s,满足设计方案的质量要求;试验桩和工程桩的Q-s曲线均为缓变形式,均未达到极限状态,所有类型桩的沉降量变异性较小;试验桩与工程桩的平均侧阻力为110.4~121.3 kPa。研究成果可为超高层建筑钻孔灌注桩基础的合理设计及施工工艺确定提供参考。

In order to improve the safety of pile foundations in super high-rise buildings,this article takes a certain high-rise building as an example and uses experimental testing methods to analyze the compression deformation and settlement of drilled pile foundations in super high-rise buildings.The results show that the integrity of the bored pile body is good,with a compressive strength of 56.8 kPa and a wave velocity of 4420-4550 m/s,meeting the quality requirements of the design scheme;The Q-s curves of the test piles and engineering piles are both in a slowly changing form and have not reached the limit state.The variation in settlement of all types of piles is relatively small;The average lateral resistance range of test piles and engineering piles is 110.4-121.3 kPa.The research results can provide reference for the rational design and construction process determination of drilled pile foundations in super high-rise buildings.