Odkształcalność piaskowców w świetle zmian wilgotności i smukłości próbek

• Autorzy: Bukowska M.

Warianty tytułu

EN

Deformability of sandstones in view of changes in humidity and slenderness ratio of samples

• Języki publikacji: PL

Abstrakty

EN

Natural humidity of rocks in the Upper Silesian Coal Basin results from the influence of mining activities and dewatering the rock mass. The state of humidity which best approximates laboratory rock tests to the conditions in the exploited rock mass is the capillary saturation state. Deformation properties of sandstones (Young’s modulus, post-peak failure modulus, critical strain, residual strain) were determined for samples of slenderness ratio of 1 and 2, which were loaded in a servo-controlled testing machine. In the samples of sandstones of different slenderness ratio, values of Young’s modulus decreased for the samples in dry-air condition and capillary saturation state. In the samples of rocks of different slenderness ratio, tested in the same state of humidity, an increase in the value of Young’s modulus was observed. The increase depends on grain size. Post-peak failure modulus of sandstones shows similar trends of changes depending on slenderness ratio, state of humidity of the samples and their grain size. In the conditions when the samples of sandstones of slenderness ratio of 1, were tested in two states of humidity, values of critical strain decreased by a few per cent. For the samples of greater slenderness ratio, which also were tested in two states of humidity there was an increase in the value of critical strain and in humidity. For the samples of slenderness ratio of 1 and 2 tested in dry-air condition and in capillary saturation state there was a decrease in the value of critical strain by a few tens percent. The trends of changes in values of residual strain are the same as of critical strain. Based on the conducted tests it was shown that humidity and slenderness ratio of the sandstone samples influence differently their deformability. Humidity has a greater influence on the value of Young’s modulus than slenderness ratio of the tested samples. For critical strain and residual strain it was demonstrated that slenderness ratio of the samples has a greater influence than humidity. Moreover, a greater influence of the value of residual strain, in comparison with the values of critical strain, was observed for sandstone samples of lower slenderness ratio.

Słowa kluczowe

PL

wilgotność; smukłość; moduł Younga; moduł post-krytyczny; odkształcenia; piaskowce; Górnośląskie Zagłębie Węglowe

EN

humidity; slenderness ratio; Young's modulus; post-critical modulus; strain; sandstones; Upper Silesian Coal Basin

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2015
• Tom: Vol. 63, nr 10/3
• Strony: 1230--1236
• Opis fizyczny: Bibliogr. 9 poz., tab., wykr.

Twórcy

autor

Bukowska M.

• Zakład Tąpań i Mechaniki Górotworu, Główny Instytut Górnictwa, pl. Gwarków 1, 40-166 Katowice

Bibliografia

• 1. BUKOWSKA M. 2015 - Influence of grain size, humidity and state of stress on the mechanical properties of sandstones. Acta Geodyn. Geomater., 12, 2 (178): 187-195. DOI: 10.13168/AGG.2015.0015.
• 2. BUKOWSKI P. & BUKOWSKA M. 2008 - Changes in geomechanical properties of carboniferous rocks under the influence of water and their possible consequences in the areas of abandoned mines of the Upper Silesian Coal Basin (Poland). [W:] Rapantova N. & Hrkal Z. (red.), Mine Water and Enviroment Procc. 10th International Mine Water Association Congress, Karlove Vary, Czech Rep.: 123-126.
• 3. BUKOWSKI P. & NIEDBALSKA K. 2013 - The analysis of select properties of solid rock materials designed for shafts liquidation. 1341 International Multidisciplinary Scientific Geoconference, Albena, Bulgaria, SGEM 2013, vol. II: 467-474.
• 4. BUKOWSKI P. 2015 - Evaluation of water hazard in hard coal mines in changing conditions of functioning of mining industry in Upper Silesian Coal Basin - USCB (Poland). Arch. Min. Sci., 60 (2): 465-485.
• 5. CIEŚLIK J. 2013 - Plastyczność i uszkodzenie wybranych skał w testach jednoosiowego i trójosiowego ściskania. Wyd. AGH, Kraków, s. 149.
• 6. HUDSON J.A., BROWN E.T. & FAIRHURST C. 1971 - Shape of the complete stress-strain curve for rock. Proc. 13th Symp. Rock Mech., Illinois: 773-795.
• 7. ŁUKASZEWSKI P. 2013 - Odkształcalność piaskowców fliszowych w złożonym stanie naprężenia. Wyd. UW, Warszawa, s. 221.
• 8. PINIŃSKA J. (red.) 2011 - Właściwości wytrzymałościowe i odkształceniowe skał Polski na dużych Głębokościach w warunkach wysokiego ciśnienia i temperatury. Wydz. Geol. UW, Warszawa, s. 193.
• 9. VUTUKURI V.S., LAMA R.D. & SALUJA S.S. 1974 - Handbook on Mechanical Properties of Rocks - Testing Techniques and Results - Vol. I. Series on Rock and Soil Mechanics, 2 (1974/75), 1. Trans Tech Publications: 33-38.