Determination of the stress-strain state of rock mass and zone of inelastic deformation around underground mine excavation using modern methods of numerical modelling

Sergey A Ignatiev,Askar Zh Imashev,Aleksandr E Sudarikov

doi:10.46873/2300-3960.1324

Sergey A Ignatiev, Askar Zh Imashev + Show 1 more

Open Access

https://doi.org/10.46873/2300-3960.1324

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Abstract

The paper reviews methods and trends of numerical modelling of geomechanical processes around underground mine excavations. The most rational method of determining the additional stresses caused by the mine excavations is chosen. Mathematical modelling was performed for excavations of various cross sections and different strength of rocks. The dimensions of the inelastic deformation zone around the mine excavations have been identified. The area of the total fracture zone around the excavation, as well as the area of the roof fracture zone are calculated. The results of the fracture zone modelling are presented both as coordinates and in a graphical form. To simplify application of the modelling results, dependency plots of the obtained parameters were created and analytical dependencies of the fracture zone parameters were identified. The SURFER and KOMPAS software packages were used as the graphic tools to visualize the modelling results

Highlights

The stability of a mine excavation means that the main technological, i.e. load-bearing capacity, and geometric characteristics of the mine support do not change over a certain period of time
The stability of excavations is maintained without the use of any kind of anchoring or impact on the surrounding rock. This option is suitable for sufficiently strong rock masses that are not considerably fractured and are not subject to weathering
The second case is the use of dedicated load-bearing structures, which is applied when the rock mass is characterized with low strength, is significantly fractured and is subject to rock strength change under the action of external factors

Summary

Introduction

The stability of a mine excavation means that the main technological, i.e. load-bearing capacity, and geometric characteristics of the mine support do not change over a certain period of time. The excavation retains its basic parameters due to the specific features of the surrounding rock mass or the type of the rock support used. The modern theory of geomechanics distinguishes two main types of retaining technological and geometric parameters of mine excavations. The stability of excavations is maintained without the use of any kind of anchoring or impact on the surrounding rock. This option is suitable for sufficiently strong rock masses that are not considerably fractured and are not subject to weathering. The second case is the use of dedicated load-bearing structures (rock support), which is applied when the rock mass is characterized with low strength, is significantly fractured and is subject to rock strength change under the action of external factors (water, air, etc.)

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