Gotsev D. V. Russia Military Aviation Engineering University, Voronezh, ул. Маршала Неделина, 133, Воронеж, Воронежская обл., 394052 rbgotsev@mail.ru Author's articles Stability of Vertical Mountain Developments in Elastic Viscous-Plastic Files with Porous Structure Stress of Heavy-Wall Tubing Cylindrical Pipes Taking into Account the Gravity for Materials with Difficult Rheology Stability of the Cylindrical Cover with the Elastic-Viscous-Plastic Filler at Axial Compression