基于试桩曲线的桩筏基础沉降实用计算方法
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国家自然科学基金 (41972291, 52020105003);江西省教育厅科学技术项目(GJJ200637)


Practical calculation method of piled raft foundation settlement based on static load test curves
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National Natural Science Foundation of China (No. 41972291, 52020105003); Science and Technology Project of Jiangxi Provincial Department of Education (No. GJJ200637)

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    摘要:

    为了克服传统基于弹性理论的桩筏基础沉降计算方法中土体参数取值困难、理论假定局限性等问题,提出了一种基于试桩曲线的桩筏基础实用计算方法。根据实际工程中桩筏基础沉降处于线弹性阶段的特点,从试桩曲线得到的单桩竖向刚度入手,基于相关理论和经验公式建立了桩筏基础整体竖向刚度的计算方法,并在此基础上给出了在设计荷载作用下桩筏基础平均沉降的实用计算方法。通过对软土地区及黄土地区高层建筑基础、嵌岩桩基础及大型交通工程4大类8个工程实例的现场实测结果对比分析,计算沉降值基本为实测沉降的0.8~1.5倍,验证了所提出的沉降计算方法的可靠性,可为实际桩筏基础初步设计中的沉降计算提供参考。

    Abstract:

    In order to avoid the shortcomings, e.g., difficulty in obtaining values of soil parameters and inaccuracy of theoretical assumptions, in the traditional elastic settlement calculation method of pile raft foundation, a practical calculation method for pile raft foundation based on static load test curves is proposed. In view of that the characteristics of the settlement of pile raft foundation is in the linear elastic stage under design load, based on the vertical stiffness of single pile obtained from the static load test curve, the calculation method of the overall vertical stiffness of pile raft foundation is established based on relevant theories and empirical formulas, and on this basis, the practical calculation method of the average settlement of pile raft foundation under working load is proposed. Via the comprehensive analysis of the field measurement and calculation results of 8 engineering cases in 4 categories of high-rise building foundation in soft soil area and loess area, rock-socketed pile foundation and large traffic engineering, the validity of the proposed method is examined. The calculated settlement value is basically 0.8~1.5 times of the measured settlement, which verifies the reliability of the proposed settlement calculation method in practical engineering. In addition, the calculation method can provide a reference for the preliminary design of settlement calculation of actual pile raft foundations.

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历史
  • 收稿日期:2022-02-16
  • 最后修改日期:2022-02-26
  • 录用日期:2022-03-01
  • 在线发布日期: 2022-10-10
  • 出版日期: