Applied Mechanics and Materials Vols. 725-726

Abstract: The authors of the article discuss some aspects of inclined tunnel escalators in St. Petersburg metro, related to the aging of the equipment and the necessity of its replacement in accordance with the new regulations; they propose some options for solving the existing problems. Secure work of escalators could be achieved and maintained by two ways: by designing new models of escalators with modern technologies at the basis, as well as by constant control over existing escalators working conditions during exploitation period. Authors show that the introduction of new regulatory requirements has asked for improving the design of escalators with the decrease of their lateral dimension in order to accommodate four machines in a tunnel. Authors also proposed methods of examining technical conditions of escalators at the final stage of their service life with the aim of extending it as well as for periodic evaluation of their technical condition using magnetic and magneto-acoustic technology in addition to the usual procedures.

Abstract: This article is about strengthening soil in application of the problem with utilization of ash-and-slag wastes from coil thermal power-stations to reduce the cost of construction of road, to get sufficiently strong of road bases with reinforcing soils, to provide a higher rate of acquisition of durability and higher durability and frost resistance.

Abstract: Main goal of this article is to introduce an used methodology of analyses for excavation of surge tank enlargement of HEC MATKA1. The way of combining of the methods for analyses of discontinual and continual media are explained. The main information’s about existing geological and geotechnical properties are also given, as a basis for analytical and numerical analyses. Some of the results from the stability analyses of structural controlled instabilities during excavation of water tank are presented. The newly secondary stress – deformation state as a result from enlargement (excavation) is analysed with program Z-SOIL.

Abstract: In this article generalized results of the analysis theoretical and experimental research are presented, as well as the data on the wide-scale implementation of vibration technology for drilling boreholes for various construction purposes. Applying various types of vibration or impact vibration onto a pipe extracted from the ground allows significant decreasing of the static force, thus making it possible to avoid using high-power hoisting equipment (cranes or hydraulic hoisting jacks), avoid damaging the pipe in the process, as well as significantly decrease the costs and improve productivity. We present the data on construction processes whose efficiency can be significantly improved by using vibration on some working organs used during drilling boreholes for various construction purposes.

Abstract: Action of ice ridge keel on vertical structures is studied by means of analytical and numerical methods. The analytical method involves keel load calculations using Russian and European recommendations provided in SP 38.13330.2012 and ISO/FDIS 19906 respectively. The numerical method involves finite element calculation. It is demonstrated that numerical methods can provide an important insight into ridges keels behavior. The numerical and analytical results obtained using Russian recommendations for vertical structures are in a good agreement.

Abstract: Sveagruva is a mining settlement in the Norwegian archipelago of Svalbard, lying in the head of Van Mijenfjord. A bridge to the opposite site of the fjord is planned to be constructed for further mine development, so investigations of coastal ice forces on one of the future bridge suspensions were held.

Abstract: Artificial, grounded ice islands built by controlled flooding of the sea ice surface with sea water have been used for exploratory drilling in the Arctic offshore. Islands fabricated from ice are becoming more prevalent as offshore oil speculation in the Arctic gains more interest. Ice has been a strategic building material in the Arctic for the construction of roads, airstrips, housing, and, in the last few decades, as temporary drilling platforms to explore for oil. This article describes various methods of artificial ice building, the advantages and disadvantages of using man-made ice islands for exploratory drilling.

Abstract: Drilling operations conducted from artificial islands are both feasible and economical in shallow waters. Accumulated experience in the construction and operation of artificial gravel islands are analysed. Capital protection of island’ slopes against the action of ice and waves are considered.

Abstract: A comprehensive settlement on the seismic impact of the gravitational platform, which in two settlement schemes consistently takes into account the vertical and horizontal impact. The first (quasi-static) takes into account the vertical oscillations of buildings, taking into account the added mass on the assumption that the construction zone near the epicenter. This foundation is regarded as a beam lying on the ground, a variable stiffness of the foundation soil in view of plastic deformation. The second design scheme allows for horizontal seismic effects in the assumption that the epicenter is removed from the structure. To account for the seismic load from vibrations Colon dynamic spectral method is used as an expansion of the resulting seismic vibrations in a row on the main forms of oscillations.

Abstract: Results of studies of ice ridges in field conditions are presented. Ice ridges investigated in the Barents Sea the proximity of the South-East of Svalbard archipelago. Five ice ridges are surveyed during research cruises in 2012-2014 years. Main engineering properties ice ridges as thickness of consolidated layer, height of sail and depth of keel were obtained. Results of research are of primary importance for evaluation of ice loads in studied area in Barents Sea.