In many settlement prediction methods, the creep settlement of shallow foundations on sand is either disregarded or accounted for using time correction factors that lack a reliable basis. These existing settlement correction factors for creep have mainly been derived from a restricted number of long-term settlement measurements and do not consider the influence of factors such as the load level, rate of load application and properties of the soil below the foundation. In this study, a newly proposed one-dimensional elasto-viscoplastic macro-element was used to investigate the factors influencing the time-dependent behaviour of shallow foundations on sand. The safety factor of the foundation, the creep characteristics of the soils and the duration of load application were found to have important effects on the post-construction settlement development. The simulation results were used to develop an enhanced settlement correction factor for creep, which takes into account the identified factors. The improved settlement correction factor was found to be comparable to existing ones when the safety factor of the foundation is 3. The effectiveness of the proposed settlement correction factor is demonstrated using creep settlement measurements from one field footing test and two case histories.

中文翻译：

---

使用宏观元素模拟改进沙地基础的蠕变修正系数

在许多沉降预测方法中，沙上浅地基的蠕变沉降要么被忽略，要么使用缺乏可靠依据的时间校正因子来解释。这些现有的蠕变沉降修正系数主要来自有限数量的长期沉降测量，没有考虑荷载水平、荷载施加速率和地基下方土壤性质等因素的影响。在本研究中，采用新提出的一维弹粘塑性宏观单元来研究影响沙土浅基础随时间变化行为的因素。研究发现，地基的安全系数、土壤的蠕变特性和荷载施加的持续时间对施工后沉降的发展具有重要影响。模拟结果用于开发增强的蠕变沉降修正系数，其中考虑了已确定的因素。当地基安全系数为 3 时，改进的沉降修正系数与现有沉降修正系数相当。使用来自一次现场基础测试和两个案例的蠕变沉降测量结果证明了所提出的沉降修正系数的有效性。