Working Performance of Anti-Arch Segments on the Left Bank Slope of Xiangjiaba Gravity Dam

摘要

The working performance of a gravity dam with an anti-arch shape differs from that of conventional gravity dams. To understand the working performance of the anti-arch segments on the bank slope of Xiangjiaba dam, linear and non-linear finite element methods were used to analyze the deformation, stress, the state of transverse joints, and cracks during operation. The anti-sliding stability coefficient of each dam segment and the safety degree of the dam were also calculated. Results show that under non-grouting of transverse joints and well grouting of cracks, deformation rules are consistent in all investigated segments and are in accord with those of conventional gravity dams. The dam heel and dam toe are subjected to compressive stress. During cold seasons, a tensile stress region is observed on top of the dam body, wherein tensile stress is smaller than tensile strength. Transverse joints are opened, whereas cracks are generally stable and closed under compression. The anti-sliding stability coefficient and safety degree of each dam segment are above 3.0, which satisfies the design code.