Russian As report look on stand
Report for stand on sheet of format A1

A.V.Shestopalov ( )


Slide 1 Slide 2
I suggest that new scientific fields such as physical mesomechanics and synergetics of the rockmass end part that arose simultaneously and independently from each other should be united under a common name of mechanodynamics (as opposed to thermodynamics). Both the scientific fields should contain subsections of quasiequilibrium and non-equilibrium mechanodynamics.

Coal seam edge self-destruction is a typical problem of synergetic (slide 1, 2). Arising of a slip area in the coal seam edge is interpreted as generation of dissipative structures. The fact that mining science does not consider methane emission as a function of technogenous crack self-organization lead to crisis of conventional knowledge about coal methane.

Slide 3 Slide 4
The alternative mechanism starts to lay the major role at big depth (slide 3, 4), i.e. below the gas erosion zone, where coal seam edge self-destruction may occur.

The "rock mass - opening (cavity)" is an open system that may be far from mechanical equilibrium at big depth.

The self-destruction proceeds from the surface to the rock mass depth and lasts till mechanical equilibrium is restored due to generation of a post-failure coal zone.

Slide 5 Slide 6
If this zone is reduced critically or eliminated (slide 5, 6), another self-destruction cycle starts and proceeds at sound rate till mechanical equilibrium is re-established. If the increase in mechanical energy flow density is caused by another event, it results in stepwise growth of the post-failure zone following a period of elastic resistance of the rock mass. Rock opening conditions cannot be simulated by laboratory experiments. Similarly, results of field experiments depend upon experimental methodology, e.g. technical means.

Slide 7 Slide 8
The author demonstrates that the end part of a rockmass is a fractal (slide 7, 8), i.e. a multi-level self-organizing system for technogenic self-propelling fractures in which the loss of shear stability occurs in a self-consistent manner at micro-, meso-, macro- and mega-scale levels. This leads to emergence of dissipative structures (geomaterial fragmentation) at the above-mentioned scale levels.

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