Study On Pressure Fluctuations Propagation Within Joints Of Plunge Pool Slabs

The characteristics of pressure fluctuations propagation in joints is one of important and difficult aspects for studying destroying mechanism of plunge pool protecting structure losing steady, at present, the pertinent research and cognition is not also mature and enough, therefore, the study of pressure propagation in joints is essential. Basing on the achievement other investigators obtained, the study of pressure fluctuations propagation in joints is carried out by means of theoretical analysis and model experiment, the main investigation content working mainly as follows:(1)Creation Mechanism of wall pressure fluctuations has been studied, and according to the mechanism diversity, the classification for pulsation wall pressure is carried out.(2) Theoretical analysis has been carried out on pressure fluctuations propagation Mechanism, mathematic formula about the model of transient flow and vibrating flow is analyzed, and the inherent relationship between them is discussed.(3)Basing on the model of transient flow, pressure fluctuations propagation mechanism is analyzed. The impact factors for intensity of fluctuations propagation, of joints are emphasized, such as celerity of pressure wave, friction drag, width. The phasic relation between upper surface and undersurface.(4)According to that the change condition for pressure fluctuations in joints, destroy process for plunge pool slabs is divided into three stages,that is seepage stage, transient flow stage and slabs-water vibrating stage, inherent relationship among them is analyzed.(5)Experiment device is designed for the study of pressure fluctuations within crack layers of lower surfaces under one slab or slabs. Measurement method and experiment scheme for wall pressure fluctuations is planned. The data collect equipment and method is introduced, and the method of data analysis being adopted is compared.(6)The characteristics of amplitude, frequency, relation and scale for pressure fluctuations within crack layers of lower surfaces under one slab or slabs beneath hydraulic jumps are analyzed. (7)It is analyzed in the paper of the characteristics of the propagation of the pressure wave within the contraction joints among slabs.Influences on fluctuating pressure are especially studied by width of joints and cracks.