Development of fracture processes in Silesian Carboniferous sandstones

• Autorzy: Łukaszewski P.
• Języki publikacji: EN

Abstrakty

EN

The development of fracture processes in selected Carboniferous rocks from the Upper Silesian Coal Basin is described, with particular regard to the behaviour of rock specimens in the post-failure stage. The fracture processes were monitored using the stress-strain relations, coupled with acoustic emission, recorded during loading. Energy accumulation and dissipation phenomena were observed during rock loading. Cracking was recorded on the stress-strain curves as deformation loops, accompanied by significant stress decreases, and as cyclic increases in acoustic emission activity. Observing and analysing stages of high acoustic emission and stress drops enabled determination of three ways ("schemes") in which fracture originated and developed during the post-critical stage. Scheme I is damage and movement of grains and rock cement, scheme II is destruction of single rock grains of particular resistance, and scheme III is a dislocational and slide deformation of the rock medium.

Słowa kluczowe

EN

fracture process; relation stress-strain; acoustic emission; post-failure stage

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2003
• Tom: Vol. 47, No 1
• Strony: 29--38
• Opis fizyczny: Bibliogr. 12 poz., rys., tab.

Twórcy

autor

Łukaszewski P.

• Faculty of Geology, Warsaw University, Żwirki i Wigury 93, PL-02-089, Warszawa Poland,

Bibliografia

• 1. BRADY B. T. (1977) - An investigation of scale invariant properties of failure. Inter. J. Rock Mech. Mining Sc. Geomech. Abstracts, 14: 121-126.
• 2. CHMURA K. (1970) - Właściwości fizyko-termiczne niektórych polskich zagłębi górniczych. Wyd. Śląsk.
• 3. HUDSON J. A., CROUCH S. L. and FAIRHUST C. (1972) - Soft, stiff and servo-controlled testing mechines: a review with reference to rock failure. Engine. Geol., 6 (3).
• 4. GUSTKIEWICZ J. (1999) - Właściwości fizyczne wybranych skał karbońskich Górnośląskiego Zagłębia Węglowego. Skały warstw siodłowych (in Polish with English summary). Wyd. IGSMiE PAN.
• 5. KRANZ R. L. (1979 ) - Crack growth and development during creep of Barre granite. Inter. J. Rock Mech. Mining Sc. Geomech. Abstracts, 16: 23-35.
• 6. PETTIJOHN F. J., POTTER P. E. and SIEVER R. (1972) - Sand and sandstone. Berlin, Haidelberg, New York.
• 7. PINIŃSKA J. (1992) - Emisja akustyczna ośrodków skalnych w stanach naprężeń pokrytycznych. Prz. Geol., 12 (40): 727-733
• 8. PINIŃSKA J. (1994) - Właściwości wytrzymałościowe i odkształceniowe skał. Część I. Skały osadowe regionu świętokrzyskiego. Tom I. Warszawa, 30.
• 9. PINIŃSKA J. and ŁUKASZEWSKI P. (1991) - The relationships between post-failure state and compression strength of Sudetic fractured rocks. Bull. Inter. Ass. Eng. Geol., 43.
• 10. PINIŃSKAJ. and ŁUKASZEWSKI P. (1992) - Rock failure in acoustic emission spectra. Proceedings of XX-th seminar of European Working Group - Acoustic Emission, Leuven.
• 11. SOKOŁOWSKI S. (1970)-Geology of Poland-Stratigraphy. Vol.1,Part 1, Publishing House Wyd. Geol. Warszawa.
• 12. TAPPONIER P. and BRACE W. F. (1976) - Development of stress-induced microcracks in Westerley granite. Inter. J. Rock Mech. Mining Sc. Geomech. Abstracts, 13: 103-112.