Analyse and Evaluation of Deformation of Structural Joint and Leakage at Qiaoqi Dam's Foundation Gallery

摘要

In the Qiaoqi dam,the deformation of structural joints between monitor gallery and grouting tunnel is a key content of dam safety monitoring.In the union anti-seepage system,the displacement of corewall and cut-off wall both have certain influence on the monitor gallery's displacement,and the monitor gallery's horizontal displacement and the settlement will increase the structural joint's dislocation. This article mainly aimes at the big dislocation deformation of vertical 0+168.12 m structural joint in the junction between monitor gallery and left grouting tunnel GJ3# ,and the leakage appeared when reservoir impoundment is up to high water level.In this paper,author analyzes the data of structure joint's dislocation,monitor gallery's vertical displacement and corewall's deformation,discusses the various influencing factors and their proportion which lead the large deformation of the structure joints. This article takes reservoir water depth and the aging factor as the factors which affect the dislocation.By the establishment of multiple partial regressions statistical model,quantitative analysis is carried on the dislocation of 0+168.12 m structural joint upstream and downstream direction. Thus the developing situation of this dislocation,is predicted to achieve early warning of the possible leakage situation.