Том 51, № 3 (2017)

Information on an evaluation of the condition of the Gotsatli hydroelectric station earth dam during filling of the reservoir and the results of field observations and numerical modeling are given. The characteristics of the seepage regime of the dam and stress-strain state of the asphalt concrete diaphragm are revealed on the basis of the data otained.

Hydrological aspects of ensuring flow-through large-capacity navigation in the tailwater of the Nizhny Novgorod (Gorky) water development are considered. Concise hydrological characteristics are presented for the reservoir of the projected Nizhny Novgorod low-head water development, one of the key objects of the water transport infrastructure of the European part of the Russian Federation, construction of which is provided for by the Federal Target Program “Development of Transport System of Russia (2010 – 2020),” the Transport Strategy of the Russian Federation for the period until 2030, and also the Strategy of Development of Inland Water Transport of the Russian Federation for the period until 2030.

Information is presented on a method of assembling a rotor of the vertical hydrogenerator with a hydroturbine rotor

The VPP-2 vibratory driver and the Russian method based on it for compacting foundations using a vibratory compactor of longitudinal vibration with a spatial compactor in a “vibro-herringbone” form have been widely used around the world for driving (extraction of) a piling and vibration compaction of sandy foundation soil, both water-saturated or slightly damp and combinations thereof. The article presents the results of a theoretical substantiation of the developed calculation model and field tests of a method of deep vibration compaction of foundations, showing its shortcomings. These shortcomings were most clearly manifested during compaction of heavy thickness of the sandy foundations (9 m and greater). It is shown that the shortcomings of the known vibratory compactor can be eliminated or significantly decreased by using a vibratory compactor with radial elements placed at a specified height in the lower part of the compactor probe. This makes it possible to improve the technical characteristics of the vibratory compactor operating with a reliable and economic vibratory driver. The main results of these researches were reported at the 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, “New innovations and sustainability” (15ARC) in Fukuoka, Kyushu, Japan, on November 9 – 13, 2015.

Some features of the vibratory condition of the prototype T-185/210-16.2 + TZFP-220-2UZ turbogenerator during the first years of operation that required thorough vibration survey and analysis to identify the main causes of the increased vibration of the bearings and shafting. The main causes of the increased vibration of the turbogenerator include a slight residual unbalance of the rotor, design features, and operating conditions. A package of measures was taken to reduce the vibration of the bearings and rotor journals in all operating conditions to a level meeting international requirements.

Results are provided for chemical analysis, determination of short-term mechanical properties, and also results for stress-rupture strength of boiler pipes manufactured by a new method of electroslag melting (ESM).

Absorptive silencers of different types for noise abatement of forced-draft fans, and the factors influencing the characteristics of silencers, are examined. Adescription is provided for the silencers developed and introduced by authors for noise abatement of induced-draft fans and fans. It is shown that silencers have specific characteristics and facilitate the provision of acoustic safety of the population of nearby residential areas.

Protected wires have insulation from cross-linked polyethylene with low heat conductivity, which impairs heat removal from the hot wire. A methodology is proposed for designing admissible continuous currents for the insulated wires of overhead transmission lines, taking into account various climatic conditions, and based on the solution of the equation of thermal balance. The materials provided in this article can be used for design and operation of overhead transmission lines on which the protected wires are used.