VNII Galurgy Stock Co., St. Petersburg, Russia:

V. P. Khutskiy, Divisional Manager, Candidate of Engineering Science, hucky@galurgy.sp.ru

During the construction of the metro stations in dense urban areas is of great importance the preservation of buildings, facilities and various communications from the harmful influence of the deformation of surfaces. In order to reduce surface deformation in tunneling, it is necessary to know which factors have the greatest impact on the shift of soil mass and the earth's surface. One of the factors that are influencing on the land surface deformations and located on it objects is the tunneling speed. Investigation of the effect of the tunneling speed of gains on the base of observations for land surface movement have noted both land surface deformation magnitudes increasing with tunneling speed increasing and its decreasing. During tunneling it is traditionally considered that with tunneling speed increasing it occurs land surface deformations decreasing. In this paper, it is analyzed the results of long-term observations of the Earth's surface subsidence during the construction of eighteen metro stations in St. Petersburg. It is considered the influence of different geological factors on the deformation of the earth's surface in the sinking of the station tunnels: the diameter of the tunnels, power solid thinlayered clays above the upper tunnel arches. In the article (work) there are presented the results of the investigations of the platform tunneling speed effect in the metro system in Saint-Petersburg on the land surface deformations carried out on the base of nature observation data. The results of carried out investigations have showed that land surface deformations in the main depends on mining and geological conditions of tunnel laying and technological tunneling factors. The platform tunneling speed doesn’t have strong effect on the land surface deformations and in the wake of on the buildings and facilities underworking safety, which are located in the mining workings effect zone.

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