地铁明挖基坑与建筑相邻位置关系的判别

Judgement of Position Relation Between Open Excavation Metro Foundation Pit and Adjacent Buildings

《城市轨道交通地下工程建设风险管理规范》(GB 50625—2011)对于周边建筑风险等级的评估主要是根据建筑的重要性分类和相邻位置关系综合确定。其中,相邻位置关系的判别仅考虑了地铁基坑工程与建筑上部结构的水平距离的影响,而未考虑建筑基础的影响。通过引入相邻位置关系的影响因子,建立了相应的计算公式以及判别邻近位置关系的方法。同时,基于理论分析和数值分析,提出了考虑地铁基坑工程与建筑上部结构、基础相对位置综合影响的相邻位置关系影响因子的改进计算公式,并据此判别相邻位置关系类别。最后,通过不同方法对浅基础和带地下室建筑的对比分析,阐述了相邻位置关系改进后的判别方法的有效性和合理性。

The assessment of risk grade of adjacent buildings is mainly based on the importance of buildings and adjacent position relation in Code for Risk Management of Underground Works in Urban Rail Transit(GB 50625-2011).However,the adjacent position relation is judged only considering the influence of the horizontal distance between metro foundation pit and building superstructure,without considering the building foundation influence.By introducing the influencing factors of adjacent position relation,the corresponding computational formula and the method for adjacent position relation judgement are established.Considering the comprehensive influence of the relative position between metro foundation pit and superstructure/foundation of building based on theoretical and numerical analysis,an improved computational formula is proposed.And the classification of adjacent position relation is concluded accordingly.Finally,through the comparative analysis of buildings with shallow foundation and buildings with basement by different methods,the validity and rationality of the improved judgement method of adjacent position relation are expounded.