Abstract: It is found out that the open joint of the longitudinal joint has increased to different extent after longitudinal joint grouting in the flood sluicing sections of the TGP dam. In this paper, the changes in the open joint of longitudinal joint are disposed and the results through three-dimension finite element method are analyzed. The emphasis is put to introduce the rules of open joint of longitudinal joint Ⅰ before and after grouting in the flood sluicing section, and elementary findings in the causes of the changes in the open joint of longitudinal joint, also introduces the influence on stress and deformation of the dam structure owing to the increment of open joint after grouting.?

摘要： 三峡泄洪坝段纵缝灌浆后监测资料发现，纵缝缝面存在不同程度的增开现象。本文通过对纵缝开度变化监测资料的整理及三维有限元计算成果的分析，重点介绍泄洪坝段纵缝I灌浆前张开度和灌浆后增开度的变化规律，纵缝开度变化成因的初步分析成果，以及纵缝灌浆后增开变形对大坝结构应力和变形的影响。