Krukovska V.V., Krukovskyi O.P. Numerical simulation of coupled processes at injection of strengthening compositions in cracked rock with injection anchors

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 149

Geoteh. meh., 2019, 149, 100-110

https://doi.org/10.15407/geotm2019.149.100

 NUMERICAL SIMULATION OF COUPLED PROCESSES AT INJECTION OF STRENGTHENING COMPOSITIONS IN CRACKED ROCK WITH INJECTION ANCHORS

¹Krukovska V.V., ¹Krukovskyi O.P.

¹Institute of Geotechnical Mechanics named by N. Poyakov of National Academy of Sciences of Ukraine

UDC 622.268.6:622.281.9

Language: Russian

Annotation.

A numerical model is developed for describing coupled processes of rock deformation around the mine working and filtration of liquid components of polymer composition. In the problem definition, initial permeability of the host rocks and permeability caused by peculiarities of the working driving and supporting are taken into account. Moment of the anchor installation after the face withdrawal, time of injection and solidification of the polymer and the effect of foaming (increase in volume) of the polymer composition during mixing of its components are taken into account as well. A change in the physical, mechanical and filtration properties of rock with cracks filled with polymer during its solidification (elastic modulus, compressive and tensile strengths, permeability) is modeled. It is taken into account that the metal injection tube starts to operate as an anchor only after its firmly fixing in the borehole, that is, after the polymer composition has been hardened. The developed model can be used for studying influence of geomechanics of filtration area formation around the mine working on the process of reinforcing composition injection with the help of injection anchor and on change the strength and filtration properties of the disturbed massif.

In this article, the authors consider the case when one injection anchor is installed in the mine roof. Results of calculation of stresses, permeability, pressure of liquid polymer composition, geometry of the hardened rock region are given. It is shown that by the moment when the injection anchor had been installed, the near-edge rocks were partially unloaded from the rock pressure, and a zone with increased diversity of the stress field components was formed around the working. When a borehole has been drilled, an injection anchor has been installed, and injection of polymer resins has started, areas with increased diversity of the stress field components and inelastic deformations around the mine continue to increase.   

However, in the mine roof, in zone under the action of the anchor, diversity of the stress field components and the rock permeability are significantly reduced. Diameter of the zone with hardened, impermeable rocks around the injection anchor reaches 2.0 m for these initial and boundary conditions.

Keywords:

rock massif consolidation, reinforcing composition injection, injection anchor, numerical modeling of coupled processes.

References

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About the authors

Krukovska Viktoriia Viktorivna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Control of Dynamic Demonstrations of Rock Pressure, Institute of Geotechnical Mechanics named by N. Poyakov of National Academy of Sciences of Ukraine  (IGTM, NAS of Ukraine), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Krukovskyi Olexandr Petrovych, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D. Sc), Deputy Director of the institute, Institute of Geotechnical Mechanics named by N. Poyakov of National Academy of Sciences of Ukraine  (IGTM, NAS of Ukraine), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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