Petrosian V. Determination of operating parameters of water-transport sheet piling structures

Dissertation is devoted to determination of real values of technical parameters of water- transport sheet piling structures, which are taken into account during structures operation. In particular, are refined running values of rigidity and geometrical characteristics of sheet piling made of U-sections regarding concrete soil conditions. It may possible to improve determination of structure's bearing capacity and to increase reliability of its technical maintenance. Full-scale in-situ tests as well as model laboratory investigations are provided to study sheet piles interaction in interlocks taking into account influence of soil and water media. During experiments, dependencies describing development of friction forces in the interlocks are determined for different conditions. On the base of experimentally determined peculiarities of U-section piles behavior a method of sheet piling calculation was worked out. Calculation model reflects dependencies between friction forces in the interlocks and piles relative mutual displacements To determine stressed-deformed state of the system “sheet piling – soil media” numerical modeling has been fulfilled. Essential influence of conditions of sheet piles interaction in the interlocks on sheet piling rigidity and geometrical characteristics was found. Particularly, for considered sheet piles with Larssen type interlocks and local soil conditions, realized running values of moment of inertia and section modulus may reach only 35-40% of catalogue's values presented by sheet piles producers. Rational design and technological solutions for sheet piling made of U-sections are worked out. These solutions allow to decrease mutual displacements of piles in the interlocks and to increase the degree of their joint work.