DefinePK

Abstract

This paper is focused on studying the processes of rock massif and the Earth’s surface deformation during construction of tunnels by mechanized complexes with balancing the load on the face with excessive pumping into the space behind the lining. Peculiarities of the construction technology have been considered. The results of automated monitoring of the enclosing array and the Earth’s surface displacements during construction of a double-track tunnel in the Frunzensky radius of the St. Petersburg subway have been analyzed. The long-term surface monitoring data have been presented. The unconventional nature of the geomechanical processes has been revealed, in particular, stable uplift of the massif and the discrete nature of deformations. For the joint consideration of technological modes of construction and monitoring data, power dependence between the amount of the excess grouting in the space behind the lining and the value of the vertical displacement of the surface was obtained. To process and analyze the data of field observations of the surface and the massif displacement and deformation, the methods of mathematical statistics and the theory of errors were used.