Abstract
The development of new deposits requires the construction of deep and super deep vertical shafts. The duration of their construction reaches 8 - 10 years with multi-billion capital investments. To reduce the payback period of these costs, it is necessary to develop and implement effective solutions to increase the speed of sinking operations through the wide introduction of brand-new mechanized equipment complexes. In response to the sinking in the bottomhole area of the shaft, the following geotechnical system is being formed: “tunnelling system - support - rock mass”, the regularities of which require further study. For these purposes, an analytical method for calculating the shaft support can be used in the context of consideration of a planar contact problem at various phases of the system operation. The mutual coordination of individual phases in accordance with the classical concepts of the underground structures mechanics is possible using a correction factor to the magnitude of horizontal stresses in the rock mass. In this paper, we developed the algorithm which determines this coefficient, taking into account the influence of the main technological factors: the pressure of the jack system of the complex and the speed of sinking.
Highlights
The development of new deposits and the reconstruction of existing mining enterprises require the construction of deep and super deep vertical shafts
To reduce the payback period of these costs, it is necessary to develop and implement effective solutions to increase the speed of sinking operations through the wide introduction of brand-new mechanized equipment complexes
The mutual coordination of these schemes in accordance with the classical concepts of the mechanics of underground structures is possible with the help of a correction factor to the magnitude of horizontal stresses in the rock mass α*.Let us consider an algorithm for its determination for the problem being solved
Summary
The development of new deposits and the reconstruction of existing mining enterprises require the construction of deep and super deep vertical shafts. A promising direction to solve this problem is the widespread introduction of brand new mechanized equipment complexes of domestic (SPKV, ASP) and foreign (Herrenknecht AG, etc.) production during the deep shaft sinking. Their wider application is hampered by a number of undeveloped issues related to the validation of a rational area of application and parameters of an effective technology for sinking with mechanized equipment complexes. The last comprehensive scientific research devoted to mechanized sinking of shafts was carried out in the last century by the leading Russian scientists and specialists of the "Donetskshahtoprokhodka" and Research and Development Establishment "podzemmash" (Turkyan R.A., Stoev I.S., Novik E.B., Levit V.V. etc.) Their result was the successful introduction of the SK-1u complex while driving the cage type shaft No 3 named after M.I. Kalinin. In the bottomhole area of the shaft, a complex geotechnical system is being developed, the "tunnelling system - support - rock mass" (hereinafter - system), the regularities of which require further study
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