论文部分内容阅读
软土基坑开挖更易导致施工事故的发生,因此有必要对该类基坑施工过程进行变形预测分析。本文引入改进的Singh-Mitchell蠕变模型及土体位移时效系数概念,提出了利用三轴流变试验数据和三维FEM模拟瞬时结果的软土基坑开挖过程中土体长时位移预测方法并给出了计算步骤。以宁波地铁车站基坑施工为案例,预测了土体长时水平位移和分层沉降量,并与现场监测结果进行了比较分析。结果表明,模型预测值与监测结果趋势一致。
The excavation of soft soil foundation pit can lead to the occurrence of construction accidents more easily. Therefore, it is necessary to predict the deformation of the foundation pit during construction. In this paper, the improved Singh-Mitchell creep model and the concept of soil displacement time-dependent coefficient are introduced, and the method of long-term soil displacement prediction during excavation of soft soil foundation pit by triaxial rheological test data and three-dimensional FEM is proposed The calculation steps are given. Taking the construction of the foundation pit of Ningbo metro station as a case, the long-term horizontal displacement and stratified settlement of the soil are predicted and compared with the on-site monitoring results. The results show that the predicted value of the model is consistent with the trend of monitoring results.