Experimental investigation of the strength and failure behavior of layered sandstone under uniaxial compression and Brazilian testing

• Autorzy: Yin P.-F. , Yang S.-Q.

Identyfikatory

DOI

10.1007/s11600-018-0152-z

• Języki publikacji: EN

Abstrakty

EN

As a typical inherently anisotropic rock, layered sandstones can differ from each other in several aspects, including grain size, type of material, type of cementation, and degree of compaction. An experimental study is essential to obtain and convictive evidence to characterize the mechanical behavior of such rock. In this paper, the mechanical behavior of a layered sandstone from Xuzhou, China, is investigated under uniaxial compression and Brazilian test conditions. The loading tests are conducted on 7 sets of bedding inclinations, which are defined as the angle between the bedding plane and horizontal direction. The uniaxial compression strength (UCS) and elastic modulus values show an undulatory variation when the bedding inclination increases. The overall trend of the UCS and elastic modulus values with bedding inclination is decreasing. The BTS value decreases with respect to the bedding inclination and the overall trend of it is approximating a linear variation. The 3D digital high-speed camera images reveal that the failure and fracture of a specimen are related to the surface deformation. Layered sandstone tested under uniaxial compression does not show a typical failure mode, although shear slip along the bedding plane occurs at high bedding inclinations. Strain gauge readings during the Brazilian tests indicate that the normal stress on the bedding plane transforms from compression to tension as the bedding inclination increases. The stress parallel to the bedding plane in a rock material transforms from tension to compression and agrees well with the fracture patterns; ‘‘central fractures’’ occur at bedding inclinations of 0–75, ‘‘layer activation’’ occurs at high bedding inclinations of 75–90, and a combination of the two occurs at 75.

Słowa kluczowe

EN

layered sandstone; uniaxial compression; Brazilian test; 3D digital image correlation system; strength anisotropy; fracture pattern

PL

piaskowiec warstwowy; jednoosiowe ściskanie; test brazylijski

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2018
• Tom: Vol. 66, no. 4
• Strony: 585--605
• Opis fizyczny: Bibliogr. 41 poz.

Twórcy

autor

Yin P.-F.

• State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

autor

Yang S.-Q.

• State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

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