An Analysis Of Sluice Pier's Cracks And Projects Of Reinforcement

This paper mainly studied the sluice pier of HeMianShi hydroelectric station. Firstly, according to a little existed data, various factors led to cracks of the sluice pier are discussed by a model based on linear three-dimensional FEM. As a result, the pier's stress of working order couldn't cause cracks, primary factor of producing cracks possibly is temperature stress of casting and quality of concrete construction.Then, in order to decide whether or not to reinforce the pier, a model with cracks based on nonlinear three-dimensional FEM is created to analyze the pier's stress of working order. During nonlinear calculation, according to the W-W five parameters failure theory, the fracture criterion of crack is established, the expansion of plastic range indicated that the cracks is dangerous for the dam's safety and the pier must be reinforced.Finally, this paper places emphasis on studying projects of reinforcement. There are two projects of reinforcement. One is cracks grouting and strengthening by prestressed anchor cable. Under the situations of different cable's locations, the distributions of the stress of various places are presented. After analysis and comparison, the prestressed effect which was produced by the anchor cable locating at a 85 meters height on the downriver of the pier is the best. Another is cracks grouting and strengthening by bonded steel plate. This project is designed , considering the building's difficulty of aforementioned project .The relevant distributions of the stress are presented.The analyzed effect of reinforcement shows that the measures of reinforcement deeply decrease the dangerous degrees, which were created by the cracks, and ensure the secure function of the HeMianShi dam.