基于Burgers模型的大型堆山工程沉降预测

Settlement Prediction for Large Heap Mountain Project Based on Burgers Model

对镇江市堆山工程中的地基土进行了室内一维固结蠕变试验,发现其流变特征符合Burgers流变模型,再将模型的蠕变方程转化成沉降计算的经验模型。根据实测沉降数据对此经验模型进行拟合,得到模型参数,且拟合精度较高,不仅避免了流变模型参数反演的繁琐性,还可以提高预测模型的精度。最终将经验模型用于堆山工程的后续沉降预测,与其他预测方法比较发现,基于Burgers模型的沉降预测方法更接近工程实际,考虑土体的流变特性是必要的,也为类似工程提供参考。

One-dimensional indoor consolidation creep test was conducted for the foundation soil of heap mountainproject in Zhenjiang city. It was found that the rheological characteristics of the soil is in line with Burgers rheologi- cal model. Then the creep equation was transformed to empirical model of settlement calculation. The empirical model was fitted according to the measured settlement data, and the fitting precision is high. It avoids tedious inver- sion of rheological model parameter, and also enhances the precision of prediction model. The empirical model was used to predict the subsequent settlement of the foundation. Results demonstrate that the empirical model based on Burgers model is closer to the actual situation compared with other prediction methods. It is necessary to consider the rheological properties of soil when calculating foundation settlement.