城市隧道施工引起建筑物变形的损坏评估

摘要

Buildings and other structures will be subjected to ground movement caused by the construction of subway tunnels or other underground structures in the vicinity.The study of the deformation and damage analysis of buildings is not adequate.This paper focuses on the analysis of multiple-storey masonry building damage induced by tunnelling.Based on the experience in Beijing area, the study started in the 1970' s, and according to the previous studies of the settlement characteristics of green field buildings and the modified stiffness method for building deformation prediction, a new approach for evaluating the damage of buildings is presented, in which a more rational parameter, the minimum curvature, is employed in the assessment procedure.The distribution characteristics of the tensile strain and the curvature of the building are studied using the proposed method.The results are in good agreement with those from the conventional method where the parameter tensile strain is used.%近年来随着城市地铁建设的快速发展,隧道施工过程中引起地面建筑物或其他结构变形而产生的损坏问题屡见不鲜.地铁建设中需要对大量的建筑物开展变形损坏风险评估工作,而科学的建筑物变形及其损坏的评估方法方面的研究尚很不成熟.针对量大面广的多层砖混结构,研究隧道施工可能造成的建筑损坏问题.利用北京市在20世纪70年代对建筑裂缝控制的研究基础和工程应用经验、特别是扎实可靠的数据得到的最小曲率控制参数,基于对建筑物在隧道施工影响下变形特征的研究和沉降预测的修正刚度法,避开不容易准确估计的建筑材料模量、截面惯性矩等参数,直接根据建筑物的沉降曲线形态,得到用拉应变控制的评估方法,发展了用最小曲率参数来控制隧道施工引起沉降的有效方法.这种评估方法与用拉应变控制的方法取得很好的一致性.