Estimating Gas and Rock Outburst Risk on the Basis of Knowledge and Experience – The Expert System Based on Fuzzy Logic

Abstract

The Author endeavored to consult some of the Polish experts who deal with assessing and preventing outburst hazards as to their knowledge and experience. On the basis of this knowledge, an expert system, based on fuzzy logic, was created. The system allows automatic assessment of outburst hazard. The work was completed in two stages. The first stage involved researching relevant sources and rules concerning outburst hazard, and, subsequently, determining a number of parameters measured or observed in the mining industry that are potentially connected with the outburst phenomenon and can be useful when estimating outburst hazard. Then, the Author contacted selected experts who are actively involved in preventing outburst hazard, both in the industry and science field. The experts were anonymously surveyed, which made it possible to select the parameters which are the most essential in assessing outburst hazard. The second stage involved gaining knowledge from the experts by means of a questionnaire-interview. Subjective opinions on estimating outburst hazard on the basis of the parameters selected during the first stage were then systematized using the structures typical of the expert system based on fuzzy logic.Keywords: coal and methane outburst, fuzzy logic, outburst hazard, experts' knowledge Autor współpracował z polskimi ekspertami związanymi z badaniami i zwalczaniem zagrożenia wyrzutowego. W wyniku współpracy pozyskał ich wiedzę i doświadczenie, na bazie której stworzył system ekspercki, oparty na logice rozmytej. System umożliwia automatyczną ocenę zagrożenia wyrzutowego. Prace przebiegały w dwóch etapach. Pierwszy etap polegał na określeniu istotnych parametrów mierzonych, bądź obserwowanych w górnictwie, które mają silny związek ze stanem zagrożenia wyrzutowego. Następnie wybrana grupa ekspertów dokonała oceny stanu zagrożenia wyrzutowego, bazując na parametrach które w pierwszym etapie uznane zostały za najistotniejsze. Pozwoliło to zbudować system ekspercki na bazie logiki rozmytej, który określa stan zagrożenia wyrzutowego w zależności od bieżącej wartości analizowanych parametrów. Słowa kluczowe: wyrzuty gazu i skał, logika rozmyta , zagrożenie wyrzutowe, wiedza ekspercka

Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

“…From the perspective of gaso-geodynamic hazards, taking into account the fact that dolomites and anhydrites are much more firm than hard coal, even the highest known values of gas content guarantee safety of exploitation. The classical theory of gas and rock outbursts assumes that the value of the energy of the gas accumulated in the rock pores has to be high enough for the gas to do work when destroying the rock and transporting it down the excavation Sobczyk 2014;Skoczylas 2014;Tian et al 2016). The high porosity values of dolomite (from 15.6 to 16.8%) and the pore pressure of gas exceeding 5.3 MPa were among the main reasons for the outburst of dolomite and other rocks that occurred in the "Rudna" copper mine in Poland in September 2009 (Wierzbicki and Młynarczuk 2013).…”

Evaluation and Management of the Gas and Rock Outburst Hazard in the Light of International Legal Regulations

“…In most mining regulations of particular countries, the probability of the outburst hazard is assessed on the basis of parameters determined either at the mine or at the laboratory, as well as on the basis of symptoms which are, in fact, the effects of observing a certain type of phenomena (Skoczylas, 2014). In the Polish regulations, a lengthy list of symptoms indicating a heightened outburst risk can be found.…”

The Repeatability of Sorption Processes Occurring in the Coal-Methane System during Multiple Measurement Series

“…From Formula (4), one can determine the effective diffusion coefficient of the analyzed sorbent, on the basis of the registered kinetics of the sorption process. The parameters a ∞ and D e from the Formula (3), for the coal-methane system, are extremely important when it comes to evaluating gas hazards and outburst hazards in hard coal mines [17]. Also, they constitute a basis for model analyses and laboratory research regarding carbon dioxide sequestration and the process of obtaining methane from coal seams [18][19][20].…”