Post-peak failure modulus in problems of mining geo-mechanics

Bukowska, M.

doi:10.1134/s1062739149050067

Cited by 25 publications

(16 citation statements)

References 16 publications

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“…The formation enabling easier gas and radon migration are the Middle Triassic rocks represented by diploporita and ore-bearing dolomites and Gogolin limestones. These sediments are characterized by high fracturing with many fi ssures, small spatial density and porosity higher than that of the surrounding rocks [15] . The highest values of radon exhalation rates reaching 79.4 mBq·m 2 ·s −1 were observed in the area with the occurrence of Triassic deposits [16].…”

Section: Local Geologymentioning

confidence: 99%

Radon problems in mining and post-mining areas in Upper Silesia region, Poland

Wysocka

2016

Nukleonika

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The new basic safety standards (BSS) Directive 2013/59/Euratom [1] puts EU member states under an obligation to establish, amongst others, national radon action plans. In order to address the issue of long-term risks from radon exposures, it is important to identify areas where elevated levels of radon can be expected. One of the types of areas affected by an increased migration of radon and by the penetration of radon into buildings are areas in which industrial activity, for example, the exploitation of mineral resources, causes changes in the geological environment. The Upper Silesian Coal Basin (USCB) in Poland is one of the examples. The results of studies conducted in the past have shown that the levels of indoor concentration of radon, to a large extent, depend on the geological structure of the subsurface layers. One of the main factors influencing the migratory abilities of radon are the mining-induced changes of a rock body. We estimate that in specific radon-prone zones, the levels of radon may exceed 300 Bq/m3 in approximately 2% of the dwellings. Another problem that may appear in post-mining areas is linked to the reclamation of radioactively contaminated areas. The complex geology of the strata in USCB, the mining activity that can be observed in the region and, additionally, the discharge of radium-bearing waters into the environment are the most significant factors affecting radon potential and hazard in dwellings in this region. In this paper, problems linked to the detection of radon in the mining area of USCB are presented.

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Section: Local Geologymentioning

confidence: 99%

Radon problems in mining and post-mining areas in Upper Silesia region, Poland

Wysocka

2016

Nukleonika

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“…so-called Weber's voids, is an often cause of occurrence of increased inflow of water or inrushes into active mine workings (Rogoż & Posyłek, 2000). Whereas an increase in water inflow in mine workings results in changes in moisture of geological surrounding of specific values of strength-deformation parameters (Bukowska, 2005(Bukowska, , 2013. Hence the changes in properties of rocks under influence of drainage or saturating them with water (Bukowski & Bukowska, 2008, 2012, and as a result changes in hydrogeological conditions; including conditions and directions of water flow in workings and in the rock mass as well as ability to accumulate it (Haładus et al, 2005).…”

Section: B)mentioning

confidence: 99%

“…Rockburst phenomena and high energy tremors of the rock mass disturb stability of the pillars and lower their strength. Employing the knowledge of strength and deformation properties of rocks in USCB, including post-peak failure properties (Bukowska, 2013(Bukowska, , 2015, it is advised to select safety parameters individually to calculate width of safety pillars on the side of reservoirs of closed mines and other underground reservoirs. Safety coefficient, which on average increases by 1.5-2.0 times the width of pillars if high rockburst or tremor susceptibility of the rock mass is concluded, is considered to be safe (Bukowski, 2010b).…”

Section: Research Tools To Evaluate Water Hazards In Today's Reality mentioning

confidence: 99%

Evaluation Of Water Hazard In Hard Coal Mines In Changing Conditions Of Functioning Of Mining Industry In Upper Silesian Coal Basin – USCB (Poland)

Bukowski¹

2015

Archives of Mining Sciences

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Water hazard has been accompanying underground mining since the first mines were built. The hazard is particularly often in the areas of mines situated in hydrogeologically outcropped part of USCB and in water rich formations of Cracow Sandstone Series. To plan properly mining actions and technical measures at each stage of life of a mine it is necessary to evaluate hydrogeological and geomechanical conditions and their changes. The conditions determine formation, occurrence and volume of the most serious sources of water hazard. Symptoms obtained in geomechanical tests and observations of forming and dewatering reservoirs of underground water, show that it is necessary to update constantly evaluation and classification of sources of water hazard or the state of water hazard in the coal mines of USCB.Development of underground mining in , which resulted in a quick increase in production, determined development and the range of influence of mining operations on the rock mass and the influence on the state of drainage and saturation of the rock mass. The result of the changes was an apparent influence on the changes in the state and shaping water hazards in the course of time. Since 1989 economic conditions of functioning of mines have been tightly associated with the conditions and rules of market economy. As a result of each of the so-called restructuring of mining activity a certain number of mining companies was closed, merged or split. The consequence is that in the vicinity of active mines and prospective mining areas, more and more often there are partially or completely flooded abandoned coal mines. Flooded coal mines have changed and still do hydrogeological conditions of their surrounding and force active mining companies to introduce changes in mining activities they are planning and conducting. The current state of flooding mine workings, is a result of realizing previous plans of restructuring mining industry, and all the changes of the state require hydrogeological documentation and evaluation of water hazard.In the today's conditions of functioning of mining industry, sources of water hazards like water reservoirs in goafs, are one of six main types of sources of hazard, and at the same time the biggest problem and the most serious threat for active mine workings. As the hydrodynamic conditions in the closed areas stabilise and the water piles up close to the surface, an increase in the influence of reservoirs on the state of environmental and public hazard (subsidence, overflowing, flooding, pollution of water in the aquifers located in the overburden and surface water).As there is a qualitative change in the directions, causes and sources of water hazard, it shall be expected that the changes will tend to increase the threat level from the closed mines. Hence since

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“…Some of these stud ies were closely re lated to Eu ro pean stan dards, e.g. in de ter min ing the re sis tance to salt crystallisation (PN-EN 12370, 2001) or es tab lish ing the re sis tance to SO 2 im pact under hu mid con di tions (PN-EN 13919, 2004); oth ers re quired indi vid u ally de ter mined pro ce dures, not com prised in stan dards (Piniñska and Dziedzic, 2006;Piniñska, 2007;K³opotowska and £ukasiak, 2011;Bukowska, 2013;K³opotowska and £ukaszewski, 2013; £ukasiak, 2013). The non-de struc tive ul trasonic re search meth ods with reg is ter ing changes of lon gi tu di nal wave ve loc ity (V p ), have been ap plied in mon i tor ing struc tural de fects and changes of rock du ra bil ity caused by de te ri o ra tion pro cesses un der lab o ra tory con di tions.…”

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confidence: 99%

The methodology of a complex engineering-geological approach to establish a Geopark: case study of the Małopolska Vistula River Gorge

Pinińska

Domonik

Dziedzic

et al. 2014

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The meth od ol ogy of a com plex en gi neer ing-geo log i cal ap proach to es tab lish a geopark: case study of the Ma³opolska Wis³a River GorgeJoanna PINIÑSKA 1, * , Andrzej DOMONIK 1 , Artur DZIEDZIC 1 and Dominik £UKASIAK 1 1 Uni ver sity of War saw, Fac ulty of Ge ol ogy, ¯wirki i Wigury 93, 02-089 Warszawa, Po land Piniñska, J., Domonik, A., Dziedzic, A., £ukasiak D., 2015. The meth od ol ogy of a com plex en gi neer ing-geo log i cal ap proach to es tab lish a geopark: case study of the Ma³opolska Wis³a River Gorge. Geo log i cal Quar terly, 59 (2): 408-418, doi: 10.7306/gq.1181Ma³opolska Wis³a River Gorge is lo cated in the mid dle stretch of the Wis³a val ley be tween Zawichost and Pu³awy. Its great por tion is sup posed to be turned into a geopark safely ap proach able by tour ists along walk ing trails lead ing to planned geosites. While gen eral cri te ria of geosite se lec tion are ori ented on pro mot ing ex pected in ter est ing at trib utes of the planned geopark or, in a spe cial case, on rec og niz ing pos si ble strong geo log i cal haz ards such as vol ca nic, earth quake and tsu nami phe nom ena, the in ner prob lems of tour ist safety are not com monly rec og nized. The Wis³a Gorge and its close vi cin ity of geopark is ded i cated to cul tural her i tage, geo log i cal his tory, land scape and lo cal folk lore. The in ner haz ards of di sas ters are cre ated here by steep, slip pery paths, col laps ible loessial can yons, rock-falls from weath ered rock-walls, and high wa ters of the nearby river chan nel run ning along side or flood ing tour ist foot paths. Rec og ni tion and pre vent ing mea sures against such haz ard re quire de ter mi na tion of the cur rent en gi neer ing-geo log i cal con di tions by test ing rock and soil prop er ties along the gorge, and by check ing the like li hood of nat u ral dis tur bance of the ter rain safety. The vul ner a bil ity of ex posed rocks to processes of nat u ral ero sion, steady weath er ing prog ress, turn ing steep clayey bluffs into slip pery ground, and to an im pact of long-term anthropogenic fac tors had to be rec og nized, checked, and tested for a fi nal as sess ment of suit abil ity of the selected place to serv ing as a geopark. The spe cial prog nos tic pro ce dure of en gi neer ing-geo log i cal haz ards was rec ommended, ap pli ca ble prior to the geopark plan ning stage. The pro ce dure en com passes a thor ough as sess ment of pos si ble safe ac ces si bil ity to par tic u lar geosites in the area des ig nated to be come a geopark. The suit abil ity of the se lected area to serv ing as a geopark was, thus, ana lysed me thod i cally with re gard to a de tailed en gi neer ing-geo log i cal and geomechanical eval u a tion of pos si ble haz ard fac tors within the whole ter rain. Proven en gi neer ing geo log i cal meth od ol o gies were em ployed for the haz ard as sess ment pro ce dure. Each of the fac tors was sub jected in di vid u ally to close ex am i na tion, with re sults recorded into a GIS in te grated in for ma tive layer, a...

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Post-peak failure modulus in problems of mining geo-mechanics

Cited by 25 publications

References 16 publications

Radon problems in mining and post-mining areas in Upper Silesia region, Poland

Radon problems in mining and post-mining areas in Upper Silesia region, Poland

Evaluation Of Water Hazard In Hard Coal Mines In Changing Conditions Of Functioning Of Mining Industry In Upper Silesian Coal Basin – USCB (Poland)

The methodology of a complex engineering-geological approach to establish a Geopark: case study of the Małopolska Vistula River Gorge

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