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基坑挡土结构的侧向变形数据是反映基坑工程安全与环境控制的重要指标之一。由于现场地质条件与施工过程的复杂性,实际发生的挡土结构变形与设计计算结果在变形值大小及分布形态上存在差异。基于工程经验及挡土结构的受力变形原理,总结归纳了挡土结构典型的变形模式及其特征,在此基础上,基于贝叶斯概率准则实现对挡土结构实测变形的整体模式及局部模式识别。依此不仅可判明实际施工工况的变化或可能存在的工程缺陷,同时由于其可以提供非正常变形模式的预警,从而弥补了现行规范中仅以变形大小和速率为预警指标的不足,对于提高信息化施工的准确性和及时性具有重要意义。
Lateral deformation data of foundation pit retaining structure is one of the important indexes that reflects the engineering safety and environmental control of foundation pit. Due to the complexity of on-site geological conditions and construction process, the deformation and design calculation results of actual retaining structures vary in the size and distribution of deformation values. Based on the engineering experience and the principle of stress and deformation of the retaining structure, the typical deformation modes and characteristics of the retaining structure are summarized. On the basis of this, the overall mode and partial Pattern recognition. According to this, not only the change of actual construction conditions or possible engineering defects, but also the early warning of abnormal deformation modes can be made to make up for the shortcomings of the existing specifications only using the deformation size and the rate as the early warning index, The accuracy and timeliness of information construction are of great significance.