Nazymko V.V., Kusen A.B., Zakharova L.M. Evolution of torsion and bending moments in a frame support profile due to its plastic deformation
- Details
- Parent Category: Geo-Technical Mechanics, 2018
- Category: Geo-Technical Mechanics, 2018, Issue 143
Geoteh. meh., 2018, 143, 60-69
https://doi.org/10.15407/geotm2018.143.060
EVOLUTION OF TORSION AND BENDING MOMENTS IN A FRAME SUPPORT PROFILE DUE TO ITS PLASTIC DEFORMATION
1Nazymko V.V., 2Kusen A.B., 1Zakharova L.M.
1Institute for Physics of Mining Processes NAS of Ukraine, 2CJSC Donetskstal - metallurgical plant
УДК 622.281.9
Languige: Ukrainian
Annotation.
The purpose of this research was to trace evolution of torque and bending moments in a frame support profile during irreversible interaction of the frames and surrounding rock mass and plastic deformation of the profile. This work was accomplished according grant 0117U002193 NAS of Ukraine.
Previous studies indicated that the frame supports were widely used for underground mining, especially coal extraction. The most intensive irreversible deformation of the frames occurred in the abutment zone outby of the longwall and active subsiding inby or behind it. The most dangerous deformation of the frames was plastic torsion of the frame profile. This deformation was followed by plastic bending both direct and skew. The FLAC3D platform was employed to simulate irreversible interaction of the frame and surrounding rock mass. The Mohr-Coulomb constitutive law was accepted to simulate overpeak behavior of the ground and the Mises model imitated plastic deformation of the steel frame profile. Boundary conditions represented depth of mining operations of 800 m. Initial state of the system was considered by using serial states of the rock mass. First, the geostatic state of the rock mass was established. The second was simulation of the roadway driving and then a frame support was installed in the roadway face.
It was for the first time when chaotic evolution of torsion and bending moments were registered during initial state of the frame loading. However, steady patterns of the moments were formed as irreversible ground movement was developing around the roadway. Critical points on the profile where plastic hinges were registered coincided with maximums of the torsion gradients. These torsion deformations caused divergence of the profile boards that reduced bearing capacity of the frame by 20% and even more. Therefore, a specific task is to prevent torsion deformations of the frame support profile.
Keywords:
ground pressure, underground roadway, steel frame support, plastic deformation, torsion, bending.
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Abouttheauthors
Nazimko Victor Victorovych,Doctor of Technical Sciences (D.Sc.), Chief Researcher of Institute of Physics of Mine Processes NAS of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Zakharova Lyudmila Mykolayvna, Doctor of Technical Sciences (D.Sc.), Researcher of Institute of Physics of Mine Processes NAS of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Kusen Oleksiy Bogdanovych, Master of Science, Closed Joint Stock Company “Donetskstal Metallurgical Plant”, Pokrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.