STADY OF CONTACT INTERACTION OF ELEMENT OF BREAST-WALL MADE OF UTILIZED TYRES WITH RETAINING GROUND

They work out various kinds of breast-walls in which tyres are threaded on the columns deepened into the ground. The space between the internal surfaces of tyres and external surfaces of columns is filled with compressed ground or cement-ground. Using Vlasov–Leontyev combined model they consider the problem of contact interaction of round elements of mentioned constructions with elastic padding at the contact. Basing on the method of Furie rows for solution of contact problems they get endless system of linear algebraic equations of Furie coefficients. As a result of solution of contact problem they find wanted values of deformation and contact pressure

Hydraulic Transients in the Long Diversion-Type Hydropower Station with a Complex Differential Surge Tank

Based on the theory of hydraulic transients and the method of characteristics (MOC), a mathematic model of the differential surge tank with pressure-reduction orifices (PROs) and overflow weirs for transient calculation is proposed. The numerical model of hydraulic transients is established using the data of a practical hydropower station; and the probable transients are simulated. The results show that successive load rejection is critical for calculating the maximum pressure in spiral case and the maximum rotating speed of runner when the bifurcated pipe is converging under the surge tank in a diversion-type hydropower station; the pressure difference between two sides of breast wall is large during transient conditions, and it would be more serious when simultaneous load rejections happen after load acceptance; the reasonable arrangement of PROs on breast wall can effectively decrease the pressure difference.