Key Technical Issues and Optimization Analysis on Temperature Control and Crack Prevention Measures for Xiluodu Super-High Arch Dam during the Construction Period

By utilizing the transverse joint opening and closing iteration technique and the finite element method based on the discontinuous deformation theory for manifolds, and with the help of measured data in situ of temperature, stress and displacement and so on during the construction period, the dynamic tracing feedback simulation/analysis was carried out to the temperature field and the stress field. On this basis, a series of effective safety control measures and methods were systematically put forward, which are beneficial to safety construction in the high temperature season and winter, improvement of the safety coefficient for restrained zones, lowering the cracking risk of low gradation concrete in portholes, ensuring the transverse joints aperture and groutability as well as effective control of the cantilever height and so on; and good effects have been obtained in the engineering practice and the important guarantee may be provided for the overall safety of Xiluodu Super-high arch dam.