Effect of Seasonal Changes in Water Temperature on Load-bearing Mechanism of P-type Spiral Case Structure
P-type spiral case structure(SCS)is generally adopted in pumped-storage power plants.Under normal op-erating conditions,the contact status of steel spiral case(SSC)and surrounding concrete is subject to seasonal changes in water temperature of SSC.Accordingly,it will affect the load-bearing mechanism of the SCS.Based on in-situ measured data of the temperature,seasonal changes in temperature of SSC were analyzed.Furthermore,the contact behavior,load-bearing mechanism of SCS and share of unbalanced hydraulic thrust were studied with FEA.The results show that the seasonal changes in water temperature of SSC will affect the gap-closing behavior of the SSC-concrete contact.In sum-mer,the rise in water temperature will increase the bearing ratio of the surrounding concrete.Moreover,the thrust ring is more prominent in winter,and the stay ring actually shares about 30％-40％of the unbalanced hydraulic thrust.Ac-cordingly,the design of the thrust ring and the anchoring of the stay ring are necessary.
pumped storage power plantP-type spiral case structureseasonal changes in water temperatureSSC-concrete contactunbalanced hydraulic thrust
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万方数据
维普
