Development of Excess Deformations of Urban Development During the Construction of Underground Metro Structures

The construction of metro structures, as well as the construction of civil buildings and structures, has an impact on the existing urban development. It is expressed in additional precipitations, which in many cases significantly exceeds the permissible values. In this case, the current regulations prescribe the implementation of joint calculations of the interaction of metro tunnels, their host mass of soil and buildings located on the surface. These calculations make it possible to assess the stress-strain state of the building at risk, identify potentially emergency structures and determine the necessary measures to strengthen them. Such calculations are always performed if the impact of new construction on metro structures is considered, but they are ignored in the opposite case, although the current level of computer technology development makes it possible to solve such problems. The article provides examples of numerical solutions to problems of mutual influence of metro buildings and structures. Long-term observations of urban development precipitation show that the actual values of precipitation of buildings above metro tunnels are significantly higher than calculated, and the time of deformation development stretches for several decades after the metro is put into operation. This is most likely due to a change in the stress deviator at the base of buildings due to tunneling, which leads to a loss of structural strength of water-saturated clay soils of low and medium degree of lithification and re-starts the mechanism of development of urban development sediments.

.G. SHASHKIN, Doctor of Sciences (Geology and Mineralogy),
V.A. VASENIN, Candidate of Sciences (Engineering),
V.N. PARAMONOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Institute “Georeconstruction” (4 Izmailovsky Prospect, Saint-Petersburg, 190005, Russian Federation)

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