Contacts

Yu. A. Kantsiber, V. I. Shtykov, A. B. Ponomarev, M. A. Vasileva Ways to Improve Hydrological Efficiency of Railway Subgrade Drainage [more] [back]

Purpose: Hydrological rationale for drainage system buildings that effectively drain poorly permeable subgrade soils. As a result of watering of soils by rainfalls and groundwaters, track upper structure undergoes deformation and loses its strength. To exclude adverse processes, various drainage devices and drainage systems are used. In the modern world, traffic speed and freight transportation quantity have risen and the load on track superstructure has significantly increased. To reduce risk for drainage system buildings it is necessary to apply hydrological requirements to ensure moisturizing regime of subgrade soils. Methods: For new structures, traditional water-balance method for drainage efficiency assessment is used. The method takes into account two main types of moisturizing: atmospheric and mixed ones. For atmospheric watering, we used the data on water estimated inflow to a drainage in Russia North-West zone. Atmospheric nutrition may be absent in the case of geomembrane usage on subgrade major platform. The distance between collectors is determined by the author’s methodology obtained by an analytical method. Results: The new structure of gravel drain is proposed. It has been proven that the proposed structure in poorly permeable soils drains a subgrade more efficiently than a subditch drainage does. An example of a hydraulic calculation of such a drain is given, the distance between outlet collectors in the set conditions is determined. Practical significance: Due to the use of gravel drainage, subgrade soil moisture will decrease that will lead to the subgrade bearing capacity increase. The results can be used in poorly permeable soils which prevalence is quite high. Structures, including gravel drainage, can be applied in combination with traditional ones. Keywords: Subgrade, poorly permeable soils, drainage, infiltration, rainfalls, groundwaters, timeframes for draining, geotextile material, geomembrane, predicted inflow, water balance, predicted sufficiency

A. K. Kanaev, E. V. Login, K. A. Pudovkina Informational Model of Promising Database in the System of Management for Carrier Ethernet Telecommunication Network [more] [back]

Purpose: To develop an informational model of a promising database in the system of management of telecommunication network which uses Carrier Ethernet technology for to ensure the efficiency of storage, access and update of data on the telecommunication network functioning that will allow to increase the operativeness of implementation of OAM (Operation, Administration and Management) control-management built-in processes at timely and reasonable decision-making on telecommunication network management in conditions of high dynamics of changes in the network state as well as in view of Carrier Ethernet technology specificities. Thus, in order to provide services of given quality, an information model of database in telecommunication network management system has been created with indication of information main sources which’re represented by subsystems and models of telecommunications network management system in accordance with the previously developed three-level conceptual model. Also, to achieve the stated goal a logical structure of the obtained database information model on the example of domain objects has been developed. Methods: Fundamentals of complex process management theory; theory of multi-agent systems of management of distributed object; theory of systems of information storage and presentation; object-oriented projection method; set-theoretic approach for the description of data set about a control object. Results: The obtained informational model of database and the developed logical three-level structure of functioning are described verbally and mathematically. The evaluation of functioning of the proposed logical structure of the database in the system of telecommunication network management using Carrier Ethernet technology and OAM mechanisms is given. The directions of further research towards development of the models of major processes of collection, processing and provision of data on functioning of subsystems in the system of telecommunications network management are proposed. Practical significance: The developed informational model of database in the system of telecommunications network management differs from well-known ones by the possibility of accounting for and including in the data of the implementation of the complex of unique models of functioning and management of Carrier Ethernet telecommunication network and the mechanisms of OAM management, that were previously obtained by the authors and represent subsystems in the telecommunications network management system with the use of Carrier Ethernet technology possibilities. Keywords: Telecommunication network, control system, object-oriented database, knowledge base, intelligent system

D. A. Afonin, V. N. Kavkazskiy, A. A. Nikitchin Operational Geodetic Check of Bottom-Hole Zone Deformations at Innovative Tunneling Technologies [more] [back]

Purpose: To consider the issue on performance of operational control of deformations of tunnel bottomhole zone with the use of ground-based laser scanning technology when tunneling with New Austrian tunneling method which is the most progressive one and feasible in economics terms for underground building construction by mining. The essence of this method is in that as a support for tunnel bottom-hole zone, a self-supporting shell made of sprayed concrete without traditional fastening method usage is applied that allows to save time for tunneling significantly, especially of those tunnels which have complex geometry and non-standard dimensions. At the same, the conceptual basis for this method is the necessity to identify operatively bottomhole zone soil mass deformations that’s justified by the need to provide job realization safety. Methods: As a major method for to determine tunnel bottomhole zone geospatial position it is proposed to consider ground-based laser scanning technology. Scanning result processing was implemented in specialized software package Leica Cyclone 3DR. Results: Existing experience of geodetic check of deformations in tunneling by New Austrian method is considered. Processing results for data on ground laser scanning of a tunnel separate fragment are presented, a tunnel mathematical three-dimensional model is obtained and assessment of deviations of tunnel actual surface from obtained theoretical one is fulfilled. Practical significance: The obtained threedimensional model can be further used for geodetic monitoring of deformations. Theoretical bases for estimation required accuracy for deformation characteristics definition are substantiated which are based on the transition from construction tolerances to average quadratic errors of deformation characteristics definition and then to average quadratic errors of coordinates for laser scanning points. The enlarged stages of scanning are defined with view of tunneling technology of New Austrian method. Keywords: New Austrian tunneling method, geodesic deformation check, tunnel bottomhole zone, groundbased laser scanning, three-dimensional model