Abstract
The scientific and technical task for determining the stress-strain state of mine workings is complicated by the presence of a layered massif. This task assumes particular importance in the case of circular tunneling. During its operation, it is important to predict the change of the stressstrain state for the massif or to carry out the prompt determination in the change of stresses and displacements for the unsupported working. The solution of this geomechanical task allows performing geometrical matching of the working, ensuring its strength and stability in the layered massif. A numerical finite element method based on StructureCAD (SCAD) software package was used to solve it. Four geomechanical systems were calculated: “unsupported working – layered massif”. Owing to the obtained results, graphs of stresses and displacements were constructed, which allow to determine these parameters for workings with different geometric parameters and X-parameter characterizing the ratio of the elasticity modulus of the matrix and the layer. Obtained regularities of change of stresses and displacements for the unsupported working when zooming made it possible to introduce scaling-parameters, which are a dimensionless ratio of the radii for a real system and a system with a unit diameter.
Highlights
The usage of shield tunneling while constructing the metro running tunnels or the opening of large-diameter workings in parts requires a clear knowledge of the stress-strain state for the massif surrounding the working [1]
The construction experience of the Kyiv metro in weak layered soils indicates that installation of the ring into the specified position is a rather difficult task, which was noted in papers [1, 2]
Even the presence of such a complex does not exclude the need for multiple calculations of each individual case in a change of the stressstrain state of the unsupported working in the layered massif
Summary
The usage of shield tunneling while constructing the metro running tunnels or the opening of large-diameter workings in parts requires a clear knowledge of the stress-strain state for the massif surrounding the working [1]. This task is related to the second, no less important geomechanical task, which is to define the strength and stability of the unsupported working. The research of stability, in this case, is important and relevant
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