Principles of assessment of karst risks for the railways in Russia

E.S. Ashpiz, T.B. Melyoshkina

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: M2D - Transportation Geotechnique

ABSTRACT: -dchanged normative basis of Russia and the Russian railways, and, foremost, the Federal laws which require the in karst-Engineering (MIIT).

RÉSUMÉ: L'annotation: agissant dès 1997 «l'Instruction pour maintenance de la voie en régions de la diffusion de le karst» pas conforme avec changé ces dernières années en Russie et sur les chemins de fer Russes par la base normative et en premier lieu Aux lois Fédérales demandant la note du risque de karstique, c'est pournouveau «l'Instruction pour maintenance de la voie en régions de la diffusion de le karst». INTRODUCTION Karst processes and phenomena are developed at many railways in the Russian Federation, especially at Gorkovskaya, Kuibyshevskaya and Sverdlovskaya rail-ways. The examples of sinkholes are provided at Figures 1 and 2. Figure 1. The sinkhole under the right edges of sleepers at PK 588+12,6 on June 7, 2010.Sverdlovskaya railway The danger of karst for the railway structures is specified by: the probability of formation, in the basement of structures, various surface developments like sinks, subsidence, etc. presence and formation of underground develop-ments of karst such as cavities, water-flooded highly fractured and de-consolidated zones and others in the basements of the engineering structures and in the are-as adjacent to tunnels. Forecasting of karst danger is a rather difficult ge-otechnical task due to the deep location of karst rocks, length of areas, and stochastic character of karst devel-opments. But, as global and national experience demonstrates, orderly monitoring and protective measures in karst-dangerous areas can help achieve the desired level of train traffic security. Figure 2 - The sinkhole located at the 413th kilometre of PK 4, Vladimir-Gorky district, 50 meters from the axis of the first railway, 2007. Gorkovskaya railway The instruction in force of 1997 "On the current maintenance of the railways in karst areas" (CPI-22/1) is no longer consistent with the changed over the recent years in the country and in railway transport regulatory framework, primarily with federal laws: "On technical regulation" , "On Railway Transport in the Russian Fed-eration", "Urban Development Code of the Russian Federation"; "Technical Regulations on the Safety of Buildings and Structures," "Technical Regulations on

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