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城市深基坑开挖或地铁隧道掘进会引起附近建筑物或其他结构的变形。长期以来对由于地层位移引起的建筑物变形的预测方法的研究还比较少,由于考虑结构刚度作用的复杂性,除了数值分析方法以外,一般在工程实践中均忽略了结构刚度对其变形的影响作用,因此结构变形预测结果大大偏于保守。在理论分析的基础上,通过机理研究和实测数据的分析,提出了体型简单、结构刚度均一的多层建筑物沉降的高斯分布模型与结构刚度影响机理;基于实测资料给出了系数K和结构剪切刚度经验关系,建立了一个考虑建筑物结构刚度的建筑物沉降曲线的预测方法–刚度修正法,是基本反映了隧道–土–结构相互作用效果的一种工程实用方法。通过北京地区的工程实测资料验证了本方法的有效性。
Excavation of a city’s deep foundation pit or subway tunneling can cause deformation of nearby structures or other structures. For a long time, there are still few studies on prediction methods of building deformation due to formation displacements. Due to the complexity of the role of structural stiffness, in addition to numerical analysis methods, the effect of structural stiffness on the deformation is generally ignored in engineering practice Therefore, the results of structural deformation prediction tend to be conservative. Based on the theoretical analysis, the mechanism of Gaussian distribution and the influence of structural rigidity on the settlement of multi-story buildings with simple body and uniform structural rigidity are proposed through the analysis of mechanistic and measured data. Based on the measured data, the relationship between coefficient K and structure Shear stiffness, a new method of stiffness correction, which is a prediction method of building settlement curve considering the rigidity of building structure, is established. It is an engineering practical method that basically reflects the effect of tunnel-soil-structure interaction. The measured data from Beijing area verified the effectiveness of this method.